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This pull request contains the following changes for UML:

Browse Source 
- Lots of cleanups, mostly from Benjamin Berg and Tiwei Bie
  - Removal of unused code
  - Fix for sparse warnings
  - Cleanup around stub_exe()
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Merge tag 'uml-for-linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

Pull UML updates from Richard Weinberger:

 - Lots of cleanups, mostly from Benjamin Berg and Tiwei Bie

 - Removal of unused code

 - Fix for sparse warnings

 - Cleanup around stub_exe()

* tag 'uml-for-linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (68 commits)
  hostfs: Fix the NULL vs IS_ERR() bug for __filemap_get_folio()
  um: move thread info into task
  um: Always dump trace for specified task in show_stack
  um: vector: Do not use drvdata in release
  um: net: Do not use drvdata in release
  um: ubd: Do not use drvdata in release
  um: ubd: Initialize ubd's disk pointer in ubd_add
  um: virtio_uml: query the number of vqs if supported
  um: virtio_uml: fix call_fd IRQ allocation
  um: virtio_uml: send SET_MEM_TABLE message with the exact size
  um: remove broken double fault detection
  um: remove duplicate UM_NSEC_PER_SEC definition
  um: remove file sync for stub data
  um: always include kconfig.h and compiler-version.h
  um: set DONTDUMP and DONTFORK flags on KASAN shadow memory
  um: fix sparse warnings in signal code
  um: fix sparse warnings from regset refactor
  um: Remove double zero check
  um: fix stub exe build with CONFIG_GCOV
  um: Use os_set_pdeathsig helper in winch thread/process
  ...
This commit is contained in:
Linus Torvalds 2024-11-30 10:34:54 -08:00
commit 831c1926ee
83 changed files with 1226 additions and 1393 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arch/um/Kconfig
View File

@ -5,6 +5,7 @@ menu "UML-specific options"
config UML
bool
default y
select ARCH_WANTS_DYNAMIC_TASK_STRUCT
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
@ -32,6 +33,8 @@ config UML
select HAVE_ARCH_VMAP_STACK
select HAVE_RUST
select ARCH_HAS_UBSAN
select HAVE_ARCH_TRACEHOOK
select THREAD_INFO_IN_TASK
config MMU
bool
@ -94,7 +97,7 @@ config MAY_HAVE_RUNTIME_DEPS
config STATIC_LINK
bool "Force a static link"
depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS
depends on !MAY_HAVE_RUNTIME_DEPS
help
This option gives you the ability to force a static link of UML.
Normally, UML is linked as a shared binary. This is inconvenient for
@ -209,8 +212,8 @@ config MMAPPER
config PGTABLE_LEVELS
int
default 3 if 3_LEVEL_PGTABLES
default 2
default 4 if 64BIT
default 2 if !64BIT
config UML_TIME_TRAVEL_SUPPORT
bool
@ -227,6 +230,21 @@ config UML_TIME_TRAVEL_SUPPORT
It is safe to say Y, but you probably don't need this.
config UML_MAX_USERSPACE_ITERATIONS
int
prompt "Maximum number of unscheduled userspace iterations"
default 10000
depends on UML_TIME_TRAVEL_SUPPORT
help
In UML inf-cpu and ext time-travel mode userspace can run without being
interrupted. This will eventually overwhelm the kernel and create OOM
situations (mainly RCU not running). This setting specifies the number
of kernel/userspace switches (minor/major page fault, signal or syscall)
for the same userspace thread before the sched_clock is advanced by a
jiffie to trigger scheduling.
Setting it to zero disables the feature.
config KASAN_SHADOW_OFFSET
hex
depends on KASAN

7
arch/um/Makefile
View File

@ -61,7 +61,8 @@ KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
-Din6addr_loopback=kernel_in6addr_loopback \
-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \
-D__close_range=kernel__close_range
KBUILD_RUSTFLAGS += -Crelocation-model=pie
@ -70,7 +71,9 @@ KBUILD_AFLAGS += $(ARCH_INCLUDE)
USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ \
-include $(srctree)/include/linux/compiler-version.h \
-include $(srctree)/include/linux/kconfig.h
#This will adjust *FLAGS accordingly to the platform.
include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux

14
arch/um/Makefile-skas
View File

@ -3,15 +3,15 @@
# Licensed under the GPL
#
GPROF_OPT += -pg
export UM_GPROF_OPT += -pg
ifdef CONFIG_CC_IS_CLANG
GCOV_OPT += -fprofile-instr-generate -fcoverage-mapping
export UM_GCOV_OPT += -fprofile-instr-generate -fcoverage-mapping
else
GCOV_OPT += -fprofile-arcs -ftest-coverage
export UM_GCOV_OPT += -fprofile-arcs -ftest-coverage
endif
CFLAGS-$(CONFIG_GCOV) += $(GCOV_OPT)
CFLAGS-$(CONFIG_GPROF) += $(GPROF_OPT)
LINK-$(CONFIG_GCOV) += $(GCOV_OPT)
LINK-$(CONFIG_GPROF) += $(GPROF_OPT)
CFLAGS-$(CONFIG_GCOV) += $(UM_GCOV_OPT)
CFLAGS-$(CONFIG_GPROF) += $(UM_GPROF_OPT)
LINK-$(CONFIG_GCOV) += $(UM_GCOV_OPT)
LINK-$(CONFIG_GPROF) += $(UM_GPROF_OPT)

1
arch/um/configs/i386_defconfig
View File

@ -1,4 +1,3 @@
CONFIG_3_LEVEL_PGTABLES=y
# CONFIG_COMPACTION is not set
CONFIG_BINFMT_MISC=m
CONFIG_HOSTFS=y

2
arch/um/drivers/chan_user.c
View File

@ -161,6 +161,8 @@ static __noreturn int winch_thread(void *arg)
int count;
char c = 1;
os_set_pdeathsig();
pty_fd = data->pty_fd;
pipe_fd = data->pipe_fd;
count = write(pipe_fd, &c, sizeof(c));

2
arch/um/drivers/hostaudio_kern.c
View File

@ -48,6 +48,7 @@ MODULE_PARM_DESC(mixer, MIXER_HELP);
#ifndef MODULE
static int set_dsp(char *name, int *add)
{
*add = 0;
dsp = name;
return 0;
}
@ -56,6 +57,7 @@ __uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
static int set_mixer(char *name, int *add)
{
*add = 0;
mixer = name;
return 0;
}

2
arch/um/drivers/net_kern.c
View File

@ -336,7 +336,7 @@ static struct platform_driver uml_net_driver = {
static void net_device_release(struct device *dev)
{
struct uml_net *device = dev_get_drvdata(dev);
struct uml_net *device = container_of(dev, struct uml_net, pdev.dev);
struct net_device *netdev = device->dev;
struct uml_net_private *lp = netdev_priv(netdev);

5
arch/um/drivers/ubd_kern.c
View File

@ -779,7 +779,7 @@ static int ubd_open_dev(struct ubd *ubd_dev)
static void ubd_device_release(struct device *dev)
{
struct ubd *ubd_dev = dev_get_drvdata(dev);
struct ubd *ubd_dev = container_of(dev, struct ubd, pdev.dev);
blk_mq_free_tag_set(&ubd_dev->tag_set);
*ubd_dev = ((struct ubd) DEFAULT_UBD);
@ -898,6 +898,8 @@ static int ubd_add(int n, char **error_out)
if (err)
goto out_cleanup_disk;
ubd_dev->disk = disk;
return 0;
out_cleanup_disk:
@ -1499,6 +1501,7 @@ int io_thread(void *arg)
{
int n, count, written, res;
os_set_pdeathsig();
os_fix_helper_signals();
while(1){

3
arch/um/drivers/vector_kern.c
View File

@ -815,7 +815,8 @@ static struct platform_driver uml_net_driver = {
static void vector_device_release(struct device *dev)
{
struct vector_device *device = dev_get_drvdata(dev);
struct vector_device *device =
container_of(dev, struct vector_device, pdev.dev);
struct net_device *netdev = device->dev;
list_del(&device->list);

4
arch/um/drivers/vhost_user.h
View File

@ -10,6 +10,7 @@
/* Feature bits */
#define VHOST_USER_F_PROTOCOL_FEATURES 30
/* Protocol feature bits */
#define VHOST_USER_PROTOCOL_F_MQ 0
#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
#define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5
#define VHOST_USER_PROTOCOL_F_CONFIG 9
@ -23,7 +24,8 @@
/* Supported transport features */
#define VHOST_USER_SUPPORTED_F BIT_ULL(VHOST_USER_F_PROTOCOL_FEATURES)
/* Supported protocol features */
#define VHOST_USER_SUPPORTED_PROTOCOL_F (BIT_ULL(VHOST_USER_PROTOCOL_F_REPLY_ACK) | \
#define VHOST_USER_SUPPORTED_PROTOCOL_F (BIT_ULL(VHOST_USER_PROTOCOL_F_MQ) | \
BIT_ULL(VHOST_USER_PROTOCOL_F_REPLY_ACK) | \
BIT_ULL(VHOST_USER_PROTOCOL_F_SLAVE_REQ) | \
BIT_ULL(VHOST_USER_PROTOCOL_F_CONFIG) | \
BIT_ULL(VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS))

51
arch/um/drivers/virtio_uml.c
View File

@ -56,6 +56,7 @@ struct virtio_uml_device {
int sock, req_fd, irq;
u64 features;
u64 protocol_features;
u64 max_vqs;
u8 status;
u8 registered:1;
u8 suspended:1;
@ -72,8 +73,6 @@ struct virtio_uml_vq_info {
bool suspended;
};
extern unsigned long long physmem_size, highmem;
#define vu_err(vu_dev, ...) dev_err(&(vu_dev)->pdev->dev, ##__VA_ARGS__)
/* Vhost-user protocol */
@ -343,6 +342,17 @@ static int vhost_user_set_protocol_features(struct virtio_uml_device *vu_dev,
protocol_features);
}
static int vhost_user_get_queue_num(struct virtio_uml_device *vu_dev,
u64 *queue_num)
{
int rc = vhost_user_send_no_payload(vu_dev, true,
VHOST_USER_GET_QUEUE_NUM);
if (rc)
return rc;
return vhost_user_recv_u64(vu_dev, queue_num);
}
static void vhost_user_reply(struct virtio_uml_device *vu_dev,
struct vhost_user_msg *msg, int response)
{
@ -516,6 +526,15 @@ static int vhost_user_init(struct virtio_uml_device *vu_dev)
return rc;
}
if (vu_dev->protocol_features &
BIT_ULL(VHOST_USER_PROTOCOL_F_MQ)) {
rc = vhost_user_get_queue_num(vu_dev, &vu_dev->max_vqs);
if (rc)
return rc;
} else {
vu_dev->max_vqs = U64_MAX;
}
return 0;
}
@ -625,7 +644,7 @@ static int vhost_user_set_mem_table(struct virtio_uml_device *vu_dev)
{
struct vhost_user_msg msg = {
.header.request = VHOST_USER_SET_MEM_TABLE,
.header.size = sizeof(msg.payload.mem_regions),
.header.size = offsetof(typeof(msg.payload.mem_regions), regions[1]),
.payload.mem_regions.num = 1,
};
unsigned long reserved = uml_reserved - uml_physmem;
@ -673,13 +692,6 @@ static int vhost_user_set_mem_table(struct virtio_uml_device *vu_dev)
if (rc < 0)
return rc;
if (highmem) {
msg.payload.mem_regions.num++;
rc = vhost_user_init_mem_region(__pa(end_iomem), highmem,
&fds[1], &msg.payload.mem_regions.regions[1]);
if (rc < 0)
return rc;
}
return vhost_user_send(vu_dev, false, &msg, fds,
msg.payload.mem_regions.num);
@ -897,7 +909,7 @@ static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
{
struct virtio_uml_vq_info *info = vq->priv;
int call_fds[2];
int rc;
int rc, irq;
/* no call FD needed/desired in this case */
if (vu_dev->protocol_features &
@ -914,19 +926,23 @@ static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
return rc;
info->call_fd = call_fds[0];
rc = um_request_irq(vu_dev->irq, info->call_fd, IRQ_READ,
vu_interrupt, IRQF_SHARED, info->name, vq);
if (rc < 0)
irq = um_request_irq(vu_dev->irq, info->call_fd, IRQ_READ,
vu_interrupt, IRQF_SHARED, info->name, vq);
if (irq < 0) {
rc = irq;
goto close_both;
}
rc = vhost_user_set_vring_call(vu_dev, vq->index, call_fds[1]);
if (rc)
goto release_irq;
vu_dev->irq = irq;
goto out;
release_irq:
um_free_irq(vu_dev->irq, vq);
um_free_irq(irq, vq);
close_both:
os_close_file(call_fds[0]);
out:
@ -1023,7 +1039,9 @@ static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vq;
/* not supported for now */
if (WARN_ON(nvqs > 64))
if (WARN(nvqs > 64 || nvqs > vu_dev->max_vqs,
"%d VQs requested, only up to 64 or %lld supported\n",
nvqs, vu_dev->max_vqs))
return -EINVAL;
rc = vhost_user_set_mem_table(vu_dev);
@ -1210,6 +1228,7 @@ static int virtio_uml_probe(struct platform_device *pdev)
vu_dev->vdev.id.vendor = VIRTIO_DEV_ANY_ID;
vu_dev->pdev = pdev;
vu_dev->req_fd = -1;
vu_dev->irq = UM_IRQ_ALLOC;
time_travel_propagate_time();

1
arch/um/include/asm/Kbuild
View File

@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
generic-y += bug.h
generic-y += compat.h
generic-y += current.h
generic-y += device.h
generic-y += dma-mapping.h
generic-y += emergency-restart.h

23
arch/um/include/asm/current.h Normal file
View File

@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CURRENT_H
#define __ASM_CURRENT_H
#include <linux/compiler.h>
#include <linux/threads.h>
#ifndef __ASSEMBLY__
struct task_struct;
extern struct task_struct *cpu_tasks[NR_CPUS];
static __always_inline struct task_struct *get_current(void)
{
return cpu_tasks[0];
}
#define current get_current()
#endif /* __ASSEMBLY__ */
#endif /* __ASM_CURRENT_H */

40
arch/um/include/asm/page.h
View File

@ -29,51 +29,35 @@ struct page;
#define clear_user_page(page, vaddr, pg) clear_page(page)
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
#define pte_val(p) ((p).pte)
#define pte_get_bits(p, bits) ((p).pte & (bits))
#define pte_set_bits(p, bits) ((p).pte |= (bits))
#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
#define pte_copy(to, from) ({ (to).pte = (from).pte; })
#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
#define pte_set_val(p, phys, prot) \
({ (p).pte = (phys) | pgprot_val(prot); })
#define pmd_val(x) ((x).pmd)
#define __pmd(x) ((pmd_t) { (x) } )
typedef unsigned long long phys_t;
#else
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
#ifdef CONFIG_3_LEVEL_PGTABLES
#if CONFIG_PGTABLE_LEVELS > 2
typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x) ((x).pmd)
#define __pmd(x) ((pmd_t) { (x) } )
#endif
#if CONFIG_PGTABLE_LEVELS > 3
typedef struct { unsigned long pud; } pud_t;
#define pud_val(x) ((x).pud)
#define __pud(x) ((pud_t) { (x) } )
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
#define pte_val(x) ((x).pte)
#define pte_get_bits(p, bits) ((p).pte & (bits))
#define pte_set_bits(p, bits) ((p).pte |= (bits))
#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
#define pte_copy(to, from) ((to).pte = (from).pte)
#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEEDSYNC))
#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
typedef unsigned long phys_t;
#endif
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct page *pgtable_t;

11
arch/um/include/asm/pgalloc.h
View File

@ -31,7 +31,7 @@ do { \
tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte))); \
} while (0)
#ifdef CONFIG_3_LEVEL_PGTABLES
#if CONFIG_PGTABLE_LEVELS > 2
#define __pmd_free_tlb(tlb, pmd, address) \
do { \
@ -39,6 +39,15 @@ do { \
tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pmd)); \
} while (0)
#if CONFIG_PGTABLE_LEVELS > 3
#define __pud_free_tlb(tlb, pud, address) \
do { \
pagetable_pud_dtor(virt_to_ptdesc(pud)); \
tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pud)); \
} while (0)
#endif
#endif
#endif

2
arch/um/include/asm/pgtable-2level.h
View File

@ -31,7 +31,7 @@
printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
pgd_val(e))
static inline int pgd_newpage(pgd_t pgd) { return 0; }
static inline int pgd_needsync(pgd_t pgd) { return 0; }
static inline void pgd_mkuptodate(pgd_t pgd) { }
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))

59
arch/um/include/asm/pgtable-3level.h → arch/um/include/asm/pgtable-4level.h
View File

@ -4,21 +4,25 @@
* Derived from include/asm-i386/pgtable.h
*/
#ifndef __UM_PGTABLE_3LEVEL_H
#define __UM_PGTABLE_3LEVEL_H
#ifndef __UM_PGTABLE_4LEVEL_H
#define __UM_PGTABLE_4LEVEL_H
#include <asm-generic/pgtable-nopud.h>
#include <asm-generic/pgtable-nop4d.h>
/* PGDIR_SHIFT determines what a third-level page table entry can map */
/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
#ifdef CONFIG_64BIT
#define PGDIR_SHIFT 30
#else
#define PGDIR_SHIFT 31
#endif
#define PGDIR_SHIFT 39
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* PUD_SHIFT determines the size of the area a third-level page table can
* map
*/
#define PUD_SHIFT 30
#define PUD_SIZE (1UL << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE-1))
/* PMD_SHIFT determines the size of the area a second-level page table can
* map
*/
@ -32,13 +36,9 @@
*/
#define PTRS_PER_PTE 512
#ifdef CONFIG_64BIT
#define PTRS_PER_PMD 512
#define PTRS_PER_PUD 512
#define PTRS_PER_PGD 512
#else
#define PTRS_PER_PMD 1024
#define PTRS_PER_PGD 1024
#endif
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
@ -48,11 +48,14 @@
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pmd_val(e))
#define pud_ERROR(e) \
printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pud_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pgd_val(e))
#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEEDSYNC))
#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
#define pud_populate(mm, pud, pmd) \
@ -60,23 +63,40 @@
#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
static inline int pgd_newpage(pgd_t pgd)
#define p4d_none(x) (!(p4d_val(x) & ~_PAGE_NEEDSYNC))
#define p4d_bad(x) ((p4d_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define p4d_present(x) (p4d_val(x) & _PAGE_PRESENT)
#define p4d_populate(mm, p4d, pud) \
set_p4d(p4d, __p4d(_PAGE_TABLE + __pa(pud)))
#define set_p4d(p4dptr, p4dval) (*(p4dptr) = (p4dval))
static inline int pgd_needsync(pgd_t pgd)
{
return(pgd_val(pgd) & _PAGE_NEWPAGE);
return pgd_val(pgd) & _PAGE_NEEDSYNC;
}
static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEEDSYNC; }
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
static inline void pud_clear (pud_t *pud)
{
set_pud(pud, __pud(_PAGE_NEWPAGE));
set_pud(pud, __pud(_PAGE_NEEDSYNC));
}
static inline void p4d_clear (p4d_t *p4d)
{
set_p4d(p4d, __p4d(_PAGE_NEEDSYNC));
}
#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
#define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))
#define p4d_page(p4d) phys_to_page(p4d_val(p4d) & PAGE_MASK)
#define p4d_pgtable(p4d) ((pud_t *) __va(p4d_val(p4d) & PAGE_MASK))
static inline unsigned long pte_pfn(pte_t pte)
{
return phys_to_pfn(pte_val(pte));
@ -97,4 +117,3 @@ static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
}
#endif

83
arch/um/include/asm/pgtable.h
View File

@ -11,8 +11,7 @@
#include <asm/fixmap.h>
#define _PAGE_PRESENT 0x001
#define _PAGE_NEWPAGE 0x002
#define _PAGE_NEWPROT 0x004
#define _PAGE_NEEDSYNC 0x002
#define _PAGE_RW 0x020
#define _PAGE_USER 0x040
#define _PAGE_ACCESSED 0x080
@ -24,10 +23,12 @@
/* We borrow bit 10 to store the exclusive marker in swap PTEs. */
#define _PAGE_SWP_EXCLUSIVE 0x400
#ifdef CONFIG_3_LEVEL_PGTABLES
#include <asm/pgtable-3level.h>
#else
#if CONFIG_PGTABLE_LEVELS == 4
#include <asm/pgtable-4level.h>
#elif CONFIG_PGTABLE_LEVELS == 2
#include <asm/pgtable-2level.h>
#else
#error "Unsupported number of page table levels"
#endif
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
@ -78,22 +79,22 @@ extern unsigned long end_iomem;
*/
#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
#define pte_clear(mm, addr, xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEEDSYNC))
#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEEDSYNC))
#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEEDSYNC; } while (0)
#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
#define pmd_needsync(x) (pmd_val(x) & _PAGE_NEEDSYNC)
#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEEDSYNC)
#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
#define pud_needsync(x) (pud_val(x) & _PAGE_NEEDSYNC)
#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEEDSYNC)
#define p4d_newpage(x) (p4d_val(x) & _PAGE_NEWPAGE)
#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEWPAGE)
#define p4d_needsync(x) (p4d_val(x) & _PAGE_NEEDSYNC)
#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEEDSYNC)
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
@ -144,14 +145,9 @@ static inline int pte_young(pte_t pte)
return pte_get_bits(pte, _PAGE_ACCESSED);
}
static inline int pte_newpage(pte_t pte)
static inline int pte_needsync(pte_t pte)
{
return pte_get_bits(pte, _PAGE_NEWPAGE);
}
static inline int pte_newprot(pte_t pte)
{
return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
return pte_get_bits(pte, _PAGE_NEEDSYNC);
}
/*
@ -160,12 +156,6 @@ static inline int pte_newprot(pte_t pte)
* =================================
*/
static inline pte_t pte_mknewprot(pte_t pte)
{
pte_set_bits(pte, _PAGE_NEWPROT);
return(pte);
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_clear_bits(pte, _PAGE_DIRTY);
@ -180,19 +170,14 @@ static inline pte_t pte_mkold(pte_t pte)
static inline pte_t pte_wrprotect(pte_t pte)
{
if (likely(pte_get_bits(pte, _PAGE_RW)))
pte_clear_bits(pte, _PAGE_RW);
else
return pte;
return(pte_mknewprot(pte));
pte_clear_bits(pte, _PAGE_RW);
return pte;
}
static inline pte_t pte_mkread(pte_t pte)
{
if (unlikely(pte_get_bits(pte, _PAGE_USER)))
return pte;
pte_set_bits(pte, _PAGE_USER);
return(pte_mknewprot(pte));
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
@ -209,23 +194,19 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkwrite_novma(pte_t pte)
{
if (unlikely(pte_get_bits(pte, _PAGE_RW)))
return pte;
pte_set_bits(pte, _PAGE_RW);
return(pte_mknewprot(pte));
return pte;
}
static inline pte_t pte_mkuptodate(pte_t pte)
{
pte_clear_bits(pte, _PAGE_NEWPAGE);
if(pte_present(pte))
pte_clear_bits(pte, _PAGE_NEWPROT);
return(pte);
pte_clear_bits(pte, _PAGE_NEEDSYNC);
return pte;
}
static inline pte_t pte_mknewpage(pte_t pte)
static inline pte_t pte_mkneedsync(pte_t pte)
{
pte_set_bits(pte, _PAGE_NEWPAGE);
pte_set_bits(pte, _PAGE_NEEDSYNC);
return(pte);
}
@ -233,13 +214,11 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
{
pte_copy(*pteptr, pteval);
/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
* mapped pages.
/* If it's a swap entry, it needs to be marked _PAGE_NEEDSYNC so
* update_pte_range knows to unmap it.
*/
*pteptr = pte_mknewpage(*pteptr);
if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
*pteptr = pte_mkneedsync(*pteptr);
}
#define PFN_PTE_SHIFT PAGE_SHIFT
@ -279,7 +258,7 @@ static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEEDSYNC);
}
/*
@ -294,8 +273,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
({ pte_t pte; \
\
pte_set_val(pte, page_to_phys(page), (pgprot)); \
if (pte_present(pte)) \
pte_mknewprot(pte_mknewpage(pte)); \
pte;})
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
@ -329,7 +306,7 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
* <--------------- offset ----------------> E < type -> 0 0 0 1 0
*
* E is the exclusive marker that is not stored in swap entries.
* _PAGE_NEWPAGE (bit 1) is always set to 1 in set_pte().
* _PAGE_NEEDSYNC (bit 1) is always set to 1 in set_pte().
*/
#define __swp_type(x) (((x).val >> 5) & 0x1f)
#define __swp_offset(x) ((x).val >> 11)

7
arch/um/include/asm/processor-generic.h
View File

@ -20,10 +20,7 @@ struct task_struct;
struct mm_struct;
struct thread_struct {
struct pt_regs regs;
struct pt_regs *segv_regs;
void *fault_addr;
jmp_buf *fault_catcher;
struct task_struct *prev_sched;
struct arch_thread arch;
jmp_buf switch_buf;
@ -33,12 +30,14 @@ struct thread_struct {
void *arg;
} thread;
} request;
/* Contains variable sized FP registers */
struct pt_regs regs;
};
#define INIT_THREAD \
{ \
.regs = EMPTY_REGS, \
.fault_addr = NULL, \
.prev_sched = NULL, \
.arch = INIT_ARCH_THREAD, \
.request = { } \

18
arch/um/include/asm/thread_info.h
View File

@ -17,35 +17,17 @@
#include <sysdep/ptrace_user.h>
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
struct thread_info *real_thread; /* Points to non-IRQ stack */
unsigned long aux_fp_regs[FP_SIZE]; /* auxiliary fp_regs to save/restore
them out-of-band */
};
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
.real_thread = NULL, \
}
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
struct thread_info *ti;
unsigned long mask = THREAD_SIZE - 1;
void *p;
asm volatile ("" : "=r" (p) : "0" (&ti));
ti = (struct thread_info *) (((unsigned long)p) & ~mask);
return ti;
}
#endif

4
arch/um/include/asm/tlbflush.h
View File

@ -9,8 +9,8 @@
#include <linux/mm.h>
/*
* In UML, we need to sync the TLB over by using mmap/munmap/mprotect syscalls
* from the process handling the MM (which can be the kernel itself).
* In UML, we need to sync the TLB over by using mmap/munmap syscalls from
* the process handling the MM (which can be the kernel itself).
*
* To track updates, we can hook into set_ptes and flush_tlb_*. With set_ptes
* we catch all PTE transitions where memory that was unusable becomes usable.

10
arch/um/include/shared/as-layout.h
View File

@ -30,25 +30,23 @@
#include <sysdep/ptrace.h>
struct cpu_task {
void *task;
};
struct task_struct;
extern struct task_struct *cpu_tasks[];
extern struct cpu_task cpu_tasks[];
extern unsigned long long physmem_size;
extern unsigned long high_physmem;
extern unsigned long uml_physmem;
extern unsigned long uml_reserved;
extern unsigned long end_vm;
extern unsigned long start_vm;
extern unsigned long long highmem;
extern unsigned long brk_start;
extern unsigned long host_task_size;
extern unsigned long stub_start;
extern int linux_main(int argc, char **argv);
extern int linux_main(int argc, char **argv, char **envp);
extern void uml_finishsetup(void);
struct siginfo;

15
arch/um/include/shared/common-offsets.h
View File

@ -6,7 +6,6 @@ DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
DEFINE(UM_GFP_KERNEL, GFP_KERNEL);
DEFINE(UM_GFP_ATOMIC, GFP_ATOMIC);
@ -15,17 +14,3 @@ DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
#ifdef CONFIG_PRINTK
DEFINE(UML_CONFIG_PRINTK, CONFIG_PRINTK);
#endif
#ifdef CONFIG_UML_X86
DEFINE(UML_CONFIG_UML_X86, CONFIG_UML_X86);
#endif
#ifdef CONFIG_64BIT
DEFINE(UML_CONFIG_64BIT, CONFIG_64BIT);
#endif
#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
DEFINE(UML_CONFIG_UML_TIME_TRAVEL_SUPPORT, CONFIG_UML_TIME_TRAVEL_SUPPORT);
#endif

1
arch/um/include/shared/kern_util.h
View File

@ -60,7 +60,6 @@ extern unsigned long from_irq_stack(int nested);
extern int singlestepping(void);
extern void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
extern void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs);
extern void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
extern void fatal_sigsegv(void) __attribute__ ((noreturn));

5
arch/um/include/shared/mem_user.h
View File

@ -47,10 +47,9 @@ extern int iomem_size;
#define ROUND_4M(n) ((((unsigned long) (n)) + (1 << 22)) & ~((1 << 22) - 1))
extern unsigned long find_iomem(char *driver, unsigned long *len_out);
extern void mem_total_pages(unsigned long physmem, unsigned long iomem,
unsigned long highmem);
extern void mem_total_pages(unsigned long physmem, unsigned long iomem);
extern void setup_physmem(unsigned long start, unsigned long usable,
unsigned long len, unsigned long long highmem);
unsigned long len);
extern void map_memory(unsigned long virt, unsigned long phys,
unsigned long len, int r, int w, int x);

15
arch/um/include/shared/os.h
View File

@ -145,7 +145,6 @@ extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
extern int os_get_ifname(int fd, char *namebuf);
extern int os_set_slip(int fd);
extern int os_mode_fd(int fd, int mode);
extern int os_fsync_file(int fd);
extern int os_seek_file(int fd, unsigned long long offset);
extern int os_open_file(const char *file, struct openflags flags, int mode);
@ -199,15 +198,11 @@ extern int create_mem_file(unsigned long long len);
extern void report_enomem(void);
/* process.c */
extern unsigned long os_process_pc(int pid);
extern int os_process_parent(int pid);
extern void os_alarm_process(int pid);
extern void os_stop_process(int pid);
extern void os_kill_process(int pid, int reap_child);
extern void os_kill_ptraced_process(int pid, int reap_child);
extern int os_getpid(void);
extern int os_getpgrp(void);
extern void init_new_thread_signals(void);
@ -220,6 +215,8 @@ extern int os_drop_memory(void *addr, int length);
extern int can_drop_memory(void);
extern int os_mincore(void *addr, unsigned long len);
void os_set_pdeathsig(void);
/* execvp.c */
extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
/* helper.c */
@ -244,7 +241,6 @@ extern void block_signals(void);
extern void unblock_signals(void);
extern int um_set_signals(int enable);
extern int um_set_signals_trace(int enable);
extern int os_is_signal_stack(void);
extern void deliver_alarm(void);
extern void register_pm_wake_signal(void);
extern void block_signals_hard(void);
@ -283,13 +279,11 @@ int map(struct mm_id *mm_idp, unsigned long virt,
unsigned long len, int prot, int phys_fd,
unsigned long long offset);
int unmap(struct mm_id *mm_idp, unsigned long addr, unsigned long len);
int protect(struct mm_id *mm_idp, unsigned long addr,
unsigned long len, unsigned int prot);
/* skas/process.c */
extern int is_skas_winch(int pid, int fd, void *data);
extern int start_userspace(unsigned long stub_stack);
extern void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs);
extern void userspace(struct uml_pt_regs *regs);
extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
extern void switch_threads(jmp_buf *me, jmp_buf *you);
extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
@ -329,9 +323,6 @@ extern int __ignore_sigio_fd(int fd);
/* tty.c */
extern int get_pty(void);
/* sys-$ARCH/task_size.c */
extern unsigned long os_get_top_address(void);
long syscall(long number, ...);
/* irqflags tracing */

6
arch/um/include/shared/registers.h
View File

@ -8,12 +8,6 @@
#include <sysdep/ptrace.h>
extern int save_i387_registers(int pid, unsigned long *fp_regs);
extern int restore_i387_registers(int pid, unsigned long *fp_regs);
extern int save_fp_registers(int pid, unsigned long *fp_regs);
extern int restore_fp_registers(int pid, unsigned long *fp_regs);
extern int save_fpx_registers(int pid, unsigned long *fp_regs);
extern int restore_fpx_registers(int pid, unsigned long *fp_regs);
extern int init_pid_registers(int pid);
extern void get_safe_registers(unsigned long *regs, unsigned long *fp_regs);
extern int get_fp_registers(int pid, unsigned long *regs);

12
arch/um/include/shared/skas/stub-data.h
View File

@ -12,6 +12,17 @@
#include <as-layout.h>
#include <sysdep/tls.h>
struct stub_init_data {
unsigned long stub_start;
int stub_code_fd;
unsigned long stub_code_offset;
int stub_data_fd;
unsigned long stub_data_offset;
unsigned long segv_handler;
};
#define STUB_NEXT_SYSCALL(s) \
((struct stub_syscall *) (((unsigned long) s) + (s)->cmd_len))
@ -19,7 +30,6 @@ enum stub_syscall_type {
STUB_SYSCALL_UNSET = 0,
STUB_SYSCALL_MMAP,
STUB_SYSCALL_MUNMAP,
STUB_SYSCALL_MPROTECT,
};
struct stub_syscall {

5
arch/um/include/shared/timetravel.h
View File

@ -12,14 +12,13 @@ enum time_travel_mode {
TT_MODE_EXTERNAL,
};
#if defined(UML_CONFIG_UML_TIME_TRAVEL_SUPPORT) || \
defined(CONFIG_UML_TIME_TRAVEL_SUPPORT)
#if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT)
extern enum time_travel_mode time_travel_mode;
extern int time_travel_should_print_bc_msg;
#else
#define time_travel_mode TT_MODE_OFF
#define time_travel_should_print_bc_msg 0
#endif /* (UML_)CONFIG_UML_TIME_TRAVEL_SUPPORT */
#endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */
void _time_travel_print_bc_msg(void);
static inline void time_travel_print_bc_msg(void)

2
arch/um/include/shared/user.h
View File

@ -38,7 +38,7 @@ extern void panic(const char *fmt, ...)
#define UM_KERN_DEBUG KERN_DEBUG
#define UM_KERN_CONT KERN_CONT
#ifdef UML_CONFIG_PRINTK
#if IS_ENABLED(CONFIG_PRINTK)
#define printk(...) _printk(__VA_ARGS__)
extern int _printk(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));

1
arch/um/kernel/dtb.c
View File

@ -31,6 +31,7 @@ void uml_dtb_init(void)
static int __init uml_dtb_setup(char *line, int *add)
{
*add = 0;
dtb = line;
return 0;
}

5
arch/um/kernel/dyn.lds.S
View File

@ -116,8 +116,6 @@ SECTIONS
.fini_array : { *(.fini_array) }
.data : {
INIT_TASK_DATA(KERNEL_STACK_SIZE)
. = ALIGN(KERNEL_STACK_SIZE);
*(.data..init_irqstack)
DATA_DATA
*(.data.* .gnu.linkonce.d.*)
SORT(CONSTRUCTORS)
@ -178,3 +176,6 @@ SECTIONS
DISCARDS
}
ASSERT(__syscall_stub_end - __syscall_stub_start <= PAGE_SIZE,
"STUB code must not be larger than one page");

1
arch/um/kernel/initrd.c
View File

@ -34,6 +34,7 @@ int __init read_initrd(void)
static int __init uml_initrd_setup(char *line, int *add)
{
*add = 0;
initrd = line;
return 0;
}

112
arch/um/kernel/irq.c
View File

@ -674,115 +674,3 @@ void __init init_IRQ(void)
/* Initialize EPOLL Loop */
os_setup_epoll();
}
/*
* IRQ stack entry and exit:
*
* Unlike i386, UML doesn't receive IRQs on the normal kernel stack
* and switch over to the IRQ stack after some preparation. We use
* sigaltstack to receive signals on a separate stack from the start.
* These two functions make sure the rest of the kernel won't be too
* upset by being on a different stack. The IRQ stack has a
* thread_info structure at the bottom so that current et al continue
* to work.
*
* to_irq_stack copies the current task's thread_info to the IRQ stack
* thread_info and sets the tasks's stack to point to the IRQ stack.
*
* from_irq_stack copies the thread_info struct back (flags may have
* been modified) and resets the task's stack pointer.
*
* Tricky bits -
*
* What happens when two signals race each other? UML doesn't block
* signals with sigprocmask, SA_DEFER, or sa_mask, so a second signal
* could arrive while a previous one is still setting up the
* thread_info.
*
* There are three cases -
* The first interrupt on the stack - sets up the thread_info and
* handles the interrupt
* A nested interrupt interrupting the copying of the thread_info -
* can't handle the interrupt, as the stack is in an unknown state
* A nested interrupt not interrupting the copying of the
* thread_info - doesn't do any setup, just handles the interrupt
*
* The first job is to figure out whether we interrupted stack setup.
* This is done by xchging the signal mask with thread_info->pending.
* If the value that comes back is zero, then there is no setup in
* progress, and the interrupt can be handled. If the value is
* non-zero, then there is stack setup in progress. In order to have
* the interrupt handled, we leave our signal in the mask, and it will
* be handled by the upper handler after it has set up the stack.
*
* Next is to figure out whether we are the outer handler or a nested
* one. As part of setting up the stack, thread_info->real_thread is
* set to non-NULL (and is reset to NULL on exit). This is the
* nesting indicator. If it is non-NULL, then the stack is already
* set up and the handler can run.
*/
static unsigned long pending_mask;
unsigned long to_irq_stack(unsigned long *mask_out)
{
struct thread_info *ti;
unsigned long mask, old;
int nested;
mask = xchg(&pending_mask, *mask_out);
if (mask != 0) {
/*
* If any interrupts come in at this point, we want to
* make sure that their bits aren't lost by our
* putting our bit in. So, this loop accumulates bits
* until xchg returns the same value that we put in.
* When that happens, there were no new interrupts,
* and pending_mask contains a bit for each interrupt
* that came in.
*/
old = *mask_out;
do {
old |= mask;
mask = xchg(&pending_mask, old);
} while (mask != old);
return 1;
}
ti = current_thread_info();
nested = (ti->real_thread != NULL);
if (!nested) {
struct task_struct *task;
struct thread_info *tti;
task = cpu_tasks[ti->cpu].task;
tti = task_thread_info(task);
*ti = *tti;
ti->real_thread = tti;
task->stack = ti;
}
mask = xchg(&pending_mask, 0);
*mask_out |= mask | nested;
return 0;
}
unsigned long from_irq_stack(int nested)
{
struct thread_info *ti, *to;
unsigned long mask;
ti = current_thread_info();
pending_mask = 1;
to = ti->real_thread;
current->stack = to;
ti->real_thread = NULL;
*to = *ti;
mask = xchg(&pending_mask, 0);
return mask & ~1;
}

20
arch/um/kernel/mem.c
View File

@ -6,7 +6,6 @@
#include <linux/stddef.h>
#include <linux/module.h>
#include <linux/memblock.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
@ -51,8 +50,6 @@ EXPORT_SYMBOL(empty_zero_page);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
/* Initialized at boot time, and readonly after that */
unsigned long long highmem;
EXPORT_SYMBOL(highmem);
int kmalloc_ok = 0;
/* Used during early boot */
@ -98,7 +95,7 @@ static void __init one_page_table_init(pmd_t *pmd)
static void __init one_md_table_init(pud_t *pud)
{
#ifdef CONFIG_3_LEVEL_PGTABLES
#if CONFIG_PGTABLE_LEVELS > 2
pmd_t *pmd_table = (pmd_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
if (!pmd_table)
panic("%s: Failed to allocate %lu bytes align=%lx\n",
@ -109,6 +106,19 @@ static void __init one_md_table_init(pud_t *pud)
#endif
}
static void __init one_ud_table_init(p4d_t *p4d)
{
#if CONFIG_PGTABLE_LEVELS > 3
pud_t *pud_table = (pud_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
if (!pud_table)
panic("%s: Failed to allocate %lu bytes align=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
set_p4d(p4d, __p4d(_KERNPG_TABLE + (unsigned long) __pa(pud_table)));
BUG_ON(pud_table != pud_offset(p4d, 0));
#endif
}
static void __init fixrange_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{
@ -126,6 +136,8 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
p4d = p4d_offset(pgd, vaddr);
if (p4d_none(*p4d))
one_ud_table_init(p4d);
pud = pud_offset(p4d, vaddr);
if (pud_none(*pud))
one_md_table_init(pud);

39
arch/um/kernel/physmem.c
View File

@ -22,19 +22,14 @@ static int physmem_fd = -1;
unsigned long high_physmem;
EXPORT_SYMBOL(high_physmem);
extern unsigned long long physmem_size;
void __init mem_total_pages(unsigned long physmem, unsigned long iomem,
unsigned long highmem)
void __init mem_total_pages(unsigned long physmem, unsigned long iomem)
{
unsigned long phys_pages, highmem_pages;
unsigned long iomem_pages, total_pages;
unsigned long phys_pages, iomem_pages, total_pages;
phys_pages = physmem >> PAGE_SHIFT;
iomem_pages = iomem >> PAGE_SHIFT;
highmem_pages = highmem >> PAGE_SHIFT;
phys_pages = physmem >> PAGE_SHIFT;
iomem_pages = iomem >> PAGE_SHIFT;
total_pages = phys_pages + iomem_pages + highmem_pages;
total_pages = phys_pages + iomem_pages;
max_mapnr = total_pages;
}
@ -64,13 +59,12 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
* @reserve_end: end address of the physical kernel memory.
* @len: Length of total physical memory that should be mapped/made
* available, in bytes.
* @highmem: Number of highmem bytes that should be mapped/made available.
*
* Creates an unlinked temporary file of size (len + highmem) and memory maps
* Creates an unlinked temporary file of size (len) and memory maps
* it on the last executable image address (uml_reserved).
*
* The offset is needed as the length of the total physical memory
* (len + highmem) includes the size of the memory used be the executable image,
* (len) includes the size of the memory used be the executable image,
* but the mapped-to address is the last address of the executable image
* (uml_reserved == end address of executable image).
*
@ -78,24 +72,24 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
* of all user space processes/kernel tasks.
*/
void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
unsigned long len)
{
unsigned long reserve = reserve_end - start;
long map_size = len - reserve;
unsigned long map_size = len - reserve;
int err;
if(map_size <= 0) {
if (len <= reserve) {
os_warn("Too few physical memory! Needed=%lu, given=%lu\n",
reserve, len);
exit(1);
}
physmem_fd = create_mem_file(len + highmem);
physmem_fd = create_mem_file(len);
err = os_map_memory((void *) reserve_end, physmem_fd, reserve,
map_size, 1, 1, 1);
if (err < 0) {
os_warn("setup_physmem - mapping %ld bytes of memory at 0x%p "
os_warn("setup_physmem - mapping %lu bytes of memory at 0x%p "
"failed - errno = %d\n", map_size,
(void *) reserve_end, err);
exit(1);
@ -107,9 +101,8 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
*/
os_seek_file(physmem_fd, __pa(__syscall_stub_start));
os_write_file(physmem_fd, __syscall_stub_start, PAGE_SIZE);
os_fsync_file(physmem_fd);
memblock_add(__pa(start), len + highmem);
memblock_add(__pa(start), len);
memblock_reserve(__pa(start), reserve);
min_low_pfn = PFN_UP(__pa(reserve_end));
@ -137,10 +130,6 @@ int phys_mapping(unsigned long phys, unsigned long long *offset_out)
region = region->next;
}
}
else if (phys < __pa(end_iomem) + highmem) {
fd = physmem_fd;
*offset_out = phys - iomem_size;
}
return fd;
}
@ -149,6 +138,8 @@ EXPORT_SYMBOL(phys_mapping);
static int __init uml_mem_setup(char *line, int *add)
{
char *retptr;
*add = 0;
physmem_size = memparse(line,&retptr);
return 0;
}

24
arch/um/kernel/process.c
View File

@ -43,7 +43,8 @@
* cares about its entry, so it's OK if another processor is modifying its
* entry.
*/
struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { NULL } };
struct task_struct *cpu_tasks[NR_CPUS];
EXPORT_SYMBOL(cpu_tasks);
void free_stack(unsigned long stack, int order)
{
@ -64,7 +65,7 @@ unsigned long alloc_stack(int order, int atomic)
static inline void set_current(struct task_struct *task)
{
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) { task });
cpu_tasks[task_thread_info(task)->cpu] = task;
}
struct task_struct *__switch_to(struct task_struct *from, struct task_struct *to)
@ -116,7 +117,7 @@ void new_thread_handler(void)
* callback returns only if the kernel thread execs a process
*/
fn(arg);
userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
userspace(&current->thread.regs.regs);
}
/* Called magically, see new_thread_handler above */
@ -133,7 +134,7 @@ static void fork_handler(void)
current->thread.prev_sched = NULL;
userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
userspace(&current->thread.regs.regs);
}
int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
@ -187,6 +188,13 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
kmalloc_ok = save_kmalloc_ok;
}
int arch_dup_task_struct(struct task_struct *dst,
struct task_struct *src)
{
memcpy(dst, src, arch_task_struct_size);
return 0;
}
void um_idle_sleep(void)
{
if (time_travel_mode != TT_MODE_OFF)
@ -287,11 +295,3 @@ unsigned long __get_wchan(struct task_struct *p)
return 0;
}
int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
{
int cpu = current_thread_info()->cpu;
return save_i387_registers(userspace_pid[cpu], (unsigned long *) fpu);
}

2
arch/um/kernel/skas/.gitignore vendored Normal file
View File

@ -0,0 +1,2 @@
stub_exe
stub_exe.dbg

38
arch/um/kernel/skas/Makefile
View File

@ -3,14 +3,48 @@
# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
#
obj-y := stub.o mmu.o process.o syscall.o uaccess.o
obj-y := stub.o mmu.o process.o syscall.o uaccess.o \
stub_exe_embed.o
# Stub executable
stub_exe_objs-y := stub_exe.o
stub_exe_objs := $(foreach F,$(stub_exe_objs-y),$(obj)/$F)
# Object file containing the ELF executable
$(obj)/stub_exe_embed.o: $(src)/stub_exe_embed.S $(obj)/stub_exe
$(obj)/stub_exe.dbg: $(stub_exe_objs) FORCE
$(call if_changed,stub_exe)
$(obj)/stub_exe: OBJCOPYFLAGS := -S
$(obj)/stub_exe: $(obj)/stub_exe.dbg FORCE
$(call if_changed,objcopy)
quiet_cmd_stub_exe = STUB_EXE $@
cmd_stub_exe = $(CC) -nostdlib -o $@ \
$(filter-out $(UM_GPROF_OPT) $(UM_GCOV_OPT),$(KBUILD_CFLAGS)) $(STUB_EXE_LDFLAGS) \
$(filter %.o,$^)
STUB_EXE_LDFLAGS = -Wl,-n -static
targets += stub_exe.dbg stub_exe $(stub_exe_objs-y)
# end
# stub.o is in the stub, so it can't be built with profiling
# GCC hardened also auto-enables -fpic, but we need %ebx so it can't work ->
# disable it
CFLAGS_stub.o := $(CFLAGS_NO_HARDENING)
UNPROFILE_OBJS := stub.o
CFLAGS_stub_exe.o := $(CFLAGS_NO_HARDENING)
# Clang will call memset() from __builtin_alloca() when stack variable
# initialization is enabled, which is used in stub_exe.c.
CFLAGS_stub_exe.o += $(call cc-option, -ftrivial-auto-var-init=uninitialized)
UNPROFILE_OBJS := stub.o stub_exe.o
KCOV_INSTRUMENT := n
include $(srctree)/arch/um/scripts/Makefile.rules

28
arch/um/kernel/skas/mmu.c
View File

@ -40,35 +40,13 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
goto out_free;
}
/*
* Ensure the new MM is clean and nothing unwanted is mapped.
*
* TODO: We should clear the memory up to STUB_START to ensure there is
* nothing mapped there, i.e. we (currently) have:
*
* |- user memory -|- unused -|- stub -|- unused -|
* ^ TASK_SIZE ^ STUB_START
*
* Meaning we have two unused areas where we may still have valid
* mappings from our internal clone(). That isn't really a problem as
* userspace is not going to access them, but it is definitely not
* correct.
*
* However, we are "lucky" and if rseq is configured, then on 32 bit
* it will fall into the first empty range while on 64 bit it is going
* to use an anonymous mapping in the second range. As such, things
* continue to work for now as long as we don't start unmapping these
* areas.
*
* Change this to STUB_START once we have a clean userspace.
*/
unmap(new_id, 0, TASK_SIZE);
/* Ensure the new MM is clean and nothing unwanted is mapped */
unmap(new_id, 0, STUB_START);
return 0;
out_free:
if (new_id->stack != 0)
free_pages(new_id->stack, ilog2(STUB_DATA_PAGES));
free_pages(new_id->stack, ilog2(STUB_DATA_PAGES));
out:
return ret;
}

4
arch/um/kernel/skas/process.c
View File

@ -22,15 +22,13 @@ static int __init start_kernel_proc(void *unused)
{
block_signals_trace();
cpu_tasks[0].task = current;
start_kernel();
return 0;
}
extern int userspace_pid[];
extern char cpu0_irqstack[];
static char cpu0_irqstack[THREAD_SIZE] __aligned(THREAD_SIZE);
int __init start_uml(void)
{

10
arch/um/kernel/skas/stub.c
View File

@ -35,16 +35,6 @@ static __always_inline int syscall_handler(struct stub_data *d)
return -1;
}
break;
case STUB_SYSCALL_MPROTECT:
res = stub_syscall3(__NR_mprotect,
sc->mem.addr, sc->mem.length,
sc->mem.prot);
if (res) {
d->err = res;
d->syscall_data_len = i;
return -1;
}
break;
default:
d->err = -95; /* EOPNOTSUPP */
d->syscall_data_len = i;

95
arch/um/kernel/skas/stub_exe.c Normal file
View File

@ -0,0 +1,95 @@
#include <sys/ptrace.h>
#include <sys/prctl.h>
#include <asm/unistd.h>
#include <sysdep/stub.h>
#include <stub-data.h>
void _start(void);
noinline static void real_init(void)
{
struct stub_init_data init_data;
unsigned long res;
struct {
void *ss_sp;
int ss_flags;
size_t ss_size;
} stack = {
.ss_size = STUB_DATA_PAGES * UM_KERN_PAGE_SIZE,
};
struct {
void *sa_handler_;
unsigned long sa_flags;
void *sa_restorer;
unsigned long long sa_mask;
} sa = {
/* Need to set SA_RESTORER (but the handler never returns) */
.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO | 0x04000000,
/* no need to mask any signals */
.sa_mask = 0,
};
/* set a nice name */
stub_syscall2(__NR_prctl, PR_SET_NAME, (unsigned long)"uml-userspace");
/* Make sure this process dies if the kernel dies */
stub_syscall2(__NR_prctl, PR_SET_PDEATHSIG, SIGKILL);
/* read information from STDIN and close it */
res = stub_syscall3(__NR_read, 0,
(unsigned long)&init_data, sizeof(init_data));
if (res != sizeof(init_data))
stub_syscall1(__NR_exit, 10);
stub_syscall1(__NR_close, 0);
/* map stub code + data */
res = stub_syscall6(STUB_MMAP_NR,
init_data.stub_start, UM_KERN_PAGE_SIZE,
PROT_READ | PROT_EXEC, MAP_FIXED | MAP_SHARED,
init_data.stub_code_fd, init_data.stub_code_offset);
if (res != init_data.stub_start)
stub_syscall1(__NR_exit, 11);
res = stub_syscall6(STUB_MMAP_NR,
init_data.stub_start + UM_KERN_PAGE_SIZE,
STUB_DATA_PAGES * UM_KERN_PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED,
init_data.stub_data_fd, init_data.stub_data_offset);
if (res != init_data.stub_start + UM_KERN_PAGE_SIZE)
stub_syscall1(__NR_exit, 12);
/* setup signal stack inside stub data */
stack.ss_sp = (void *)init_data.stub_start + UM_KERN_PAGE_SIZE;
stub_syscall2(__NR_sigaltstack, (unsigned long)&stack, 0);
/* register SIGSEGV handler */
sa.sa_handler_ = (void *) init_data.segv_handler;
res = stub_syscall4(__NR_rt_sigaction, SIGSEGV, (unsigned long)&sa, 0,
sizeof(sa.sa_mask));
if (res != 0)
stub_syscall1(__NR_exit, 13);
stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
stub_syscall2(__NR_kill, stub_syscall0(__NR_getpid), SIGSTOP);
stub_syscall1(__NR_exit, 14);
__builtin_unreachable();
}
__attribute__((naked)) void _start(void)
{
/*
* Since the stack after exec() starts at the top-most address,
* but that's exactly where we also want to map the stub data
* and code, this must:
* - push the stack by 1 code and STUB_DATA_PAGES data pages
* - call real_init()
* This way, real_init() can use the stack normally, while the
* original stack further down (higher address) will become
* inaccessible after the mmap() calls above.
*/
stub_start(real_init);
}

11
arch/um/kernel/skas/stub_exe_embed.S Normal file
View File

@ -0,0 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/init.h>
#include <linux/linkage.h>
__INITDATA
SYM_DATA_START(stub_exe_start)
.incbin "arch/um/kernel/skas/stub_exe"
SYM_DATA_END_LABEL(stub_exe_start, SYM_L_GLOBAL, stub_exe_end)
__FINIT

8
arch/um/kernel/sysrq.c
View File

@ -32,12 +32,6 @@ void show_stack(struct task_struct *task, unsigned long *stack,
struct pt_regs *segv_regs = current->thread.segv_regs;
int i;
if (!segv_regs && os_is_signal_stack()) {
pr_err("Received SIGSEGV in SIGSEGV handler,"
" aborting stack trace!\n");
return;
}
if (!stack)
stack = get_stack_pointer(task, segv_regs);
@ -52,5 +46,5 @@ void show_stack(struct task_struct *task, unsigned long *stack,
}
printk("%sCall Trace:\n", loglvl);
dump_trace(current, &stackops, (void *)loglvl);
dump_trace(task ?: current, &stackops, (void *)loglvl);
}

20
arch/um/kernel/time.c
View File

@ -25,6 +25,8 @@
#include <shared/init.h>
#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
#include <linux/sched/clock.h>
enum time_travel_mode time_travel_mode;
EXPORT_SYMBOL_GPL(time_travel_mode);
@ -47,6 +49,15 @@ static u16 time_travel_shm_id;
static struct um_timetravel_schedshm *time_travel_shm;
static union um_timetravel_schedshm_client *time_travel_shm_client;
unsigned long tt_extra_sched_jiffies;
notrace unsigned long long sched_clock(void)
{
return (unsigned long long)(jiffies - INITIAL_JIFFIES +
tt_extra_sched_jiffies)
* (NSEC_PER_SEC / HZ);
}
static void time_travel_set_time(unsigned long long ns)
{
if (unlikely(ns < time_travel_time))
@ -443,6 +454,11 @@ static void time_travel_periodic_timer(struct time_travel_event *e)
{
time_travel_add_event(&time_travel_timer_event,
time_travel_time + time_travel_timer_interval);
/* clock tick; decrease extra jiffies by keeping sched_clock constant */
if (tt_extra_sched_jiffies > 0)
tt_extra_sched_jiffies -= 1;
deliver_alarm();
}
@ -594,6 +610,10 @@ EXPORT_SYMBOL_GPL(time_travel_add_irq_event);
static void time_travel_oneshot_timer(struct time_travel_event *e)
{
/* clock tick; decrease extra jiffies by keeping sched_clock constant */
if (tt_extra_sched_jiffies > 0)
tt_extra_sched_jiffies -= 1;
deliver_alarm();
}

70
arch/um/kernel/tlb.c
View File

@ -23,9 +23,6 @@ struct vm_ops {
int phys_fd, unsigned long long offset);
int (*unmap)(struct mm_id *mm_idp,
unsigned long virt, unsigned long len);
int (*mprotect)(struct mm_id *mm_idp,
unsigned long virt, unsigned long len,
unsigned int prot);
};
static int kern_map(struct mm_id *mm_idp,
@ -44,15 +41,6 @@ static int kern_unmap(struct mm_id *mm_idp,
return os_unmap_memory((void *)virt, len);
}
static int kern_mprotect(struct mm_id *mm_idp,
unsigned long virt, unsigned long len,
unsigned int prot)
{
return os_protect_memory((void *)virt, len,
prot & UM_PROT_READ, prot & UM_PROT_WRITE,
1);
}
void report_enomem(void)
{
printk(KERN_ERR "UML ran out of memory on the host side! "
@ -65,33 +53,37 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
struct vm_ops *ops)
{
pte_t *pte;
int r, w, x, prot, ret = 0;
int ret = 0;
pte = pte_offset_kernel(pmd, addr);
do {
r = pte_read(*pte);
w = pte_write(*pte);
x = pte_exec(*pte);
if (!pte_young(*pte)) {
r = 0;
w = 0;
} else if (!pte_dirty(*pte))
w = 0;
if (!pte_needsync(*pte))
continue;
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0));
if (pte_newpage(*pte)) {
if (pte_present(*pte)) {
__u64 offset;
unsigned long phys = pte_val(*pte) & PAGE_MASK;
int fd = phys_mapping(phys, &offset);
if (pte_present(*pte)) {
__u64 offset;
unsigned long phys = pte_val(*pte) & PAGE_MASK;
int fd = phys_mapping(phys, &offset);
int r, w, x, prot;
r = pte_read(*pte);
w = pte_write(*pte);
x = pte_exec(*pte);
if (!pte_young(*pte)) {
r = 0;
w = 0;
} else if (!pte_dirty(*pte))
w = 0;
prot = (r ? UM_PROT_READ : 0) |
(w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0);
ret = ops->mmap(ops->mm_idp, addr, PAGE_SIZE,
prot, fd, offset);
} else
ret = ops->unmap(ops->mm_idp, addr, PAGE_SIZE);
ret = ops->mmap(ops->mm_idp, addr, PAGE_SIZE,
prot, fd, offset);
} else
ret = ops->unmap(ops->mm_idp, addr, PAGE_SIZE);
} else if (pte_newprot(*pte))
ret = ops->mprotect(ops->mm_idp, addr, PAGE_SIZE, prot);
*pte = pte_mkuptodate(*pte);
} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
return ret;
@ -109,7 +101,7 @@ static inline int update_pmd_range(pud_t *pud, unsigned long addr,
do {
next = pmd_addr_end(addr, end);
if (!pmd_present(*pmd)) {
if (pmd_newpage(*pmd)) {
if (pmd_needsync(*pmd)) {
ret = ops->unmap(ops->mm_idp, addr,
next - addr);
pmd_mkuptodate(*pmd);
@ -132,7 +124,7 @@ static inline int update_pud_range(p4d_t *p4d, unsigned long addr,
do {
next = pud_addr_end(addr, end);
if (!pud_present(*pud)) {
if (pud_newpage(*pud)) {
if (pud_needsync(*pud)) {
ret = ops->unmap(ops->mm_idp, addr,
next - addr);
pud_mkuptodate(*pud);
@ -155,7 +147,7 @@ static inline int update_p4d_range(pgd_t *pgd, unsigned long addr,
do {
next = p4d_addr_end(addr, end);
if (!p4d_present(*p4d)) {
if (p4d_newpage(*p4d)) {
if (p4d_needsync(*p4d)) {
ret = ops->unmap(ops->mm_idp, addr,
next - addr);
p4d_mkuptodate(*p4d);
@ -180,18 +172,16 @@ int um_tlb_sync(struct mm_struct *mm)
if (mm == &init_mm) {
ops.mmap = kern_map;
ops.unmap = kern_unmap;
ops.mprotect = kern_mprotect;
} else {
ops.mmap = map;
ops.unmap = unmap;
ops.mprotect = protect;
}
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, mm->context.sync_tlb_range_to);
if (!pgd_present(*pgd)) {
if (pgd_newpage(*pgd)) {
if (pgd_needsync(*pgd)) {
ret = ops.unmap(ops.mm_idp, addr,
next - addr);
pgd_mkuptodate(*pgd);

16
arch/um/kernel/trap.c
View File

@ -201,7 +201,6 @@ void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
struct uml_pt_regs *regs)
{
jmp_buf *catcher;
int si_code;
int err;
int is_write = FAULT_WRITE(fi);
@ -246,15 +245,8 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
address = 0;
}
catcher = current->thread.fault_catcher;
if (!err)
goto out;
else if (catcher != NULL) {
current->thread.fault_addr = (void *) address;
UML_LONGJMP(catcher, 1);
}
else if (current->thread.fault_addr != NULL)
panic("fault_addr set but no fault catcher");
else if (!is_user && arch_fixup(ip, regs))
goto out;
@ -310,14 +302,6 @@ void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
}
}
void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
if (current->thread.fault_catcher != NULL)
UML_LONGJMP(current->thread.fault_catcher, 1);
else
relay_signal(sig, si, regs);
}
void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);

75
arch/um/kernel/um_arch.c
View File

@ -65,9 +65,6 @@ struct cpuinfo_um boot_cpu_data = {
EXPORT_SYMBOL(boot_cpu_data);
union thread_union cpu0_irqstack
__section(".data..init_irqstack") =
{ .thread_info = INIT_THREAD_INFO(init_task) };
/* Changed in setup_arch, which is called in early boot */
static char host_info[(__NEW_UTS_LEN + 1) * 5];
@ -131,7 +128,7 @@ static int have_root __initdata;
static int have_console __initdata;
/* Set in uml_mem_setup and modified in linux_main */
long long physmem_size = 64 * 1024 * 1024;
unsigned long long physmem_size = 64 * 1024 * 1024;
EXPORT_SYMBOL(physmem_size);
static const char *usage_string =
@ -167,19 +164,6 @@ __uml_setup("root=", uml_root_setup,
" root=/dev/ubd5\n\n"
);
static int __init no_skas_debug_setup(char *line, int *add)
{
os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
os_warn("'gdb linux'\n");
return 0;
}
__uml_setup("debug", no_skas_debug_setup,
"debug\n"
" this flag is not needed to run gdb on UML in skas mode\n\n"
);
static int __init uml_console_setup(char *line, int *add)
{
have_console = 1;
@ -257,6 +241,8 @@ static struct notifier_block panic_exit_notifier = {
void uml_finishsetup(void)
{
cpu_tasks[0] = &init_task;
atomic_notifier_chain_register(&panic_notifier_list,
&panic_exit_notifier);
@ -302,7 +288,24 @@ static void parse_cache_line(char *line)
}
}
int __init linux_main(int argc, char **argv)
static unsigned long get_top_address(char **envp)
{
unsigned long top_addr = (unsigned long) &top_addr;
int i;
/* The earliest variable should be after the program name in ELF */
for (i = 0; envp[i]; i++) {
if ((unsigned long) envp[i] > top_addr)
top_addr = (unsigned long) envp[i];
}
top_addr &= ~(UM_KERN_PAGE_SIZE - 1);
top_addr += UM_KERN_PAGE_SIZE;
return top_addr;
}
int __init linux_main(int argc, char **argv, char **envp)
{
unsigned long avail, diff;
unsigned long virtmem_size, max_physmem;
@ -324,20 +327,23 @@ int __init linux_main(int argc, char **argv)
if (have_console == 0)
add_arg(DEFAULT_COMMAND_LINE_CONSOLE);
host_task_size = os_get_top_address();
/* reserve a few pages for the stubs (taking care of data alignment) */
/* align the data portion */
BUILD_BUG_ON(!is_power_of_2(STUB_DATA_PAGES));
stub_start = (host_task_size - 1) & ~(STUB_DATA_PAGES * PAGE_SIZE - 1);
host_task_size = get_top_address(envp);
/* reserve a few pages for the stubs */
stub_start = host_task_size - STUB_DATA_PAGES * PAGE_SIZE;
/* another page for the code portion */
stub_start -= PAGE_SIZE;
host_task_size = stub_start;
/* Limit TASK_SIZE to what is addressable by the page table */
task_size = host_task_size;
if (task_size > (unsigned long long) PTRS_PER_PGD * PGDIR_SIZE)
task_size = PTRS_PER_PGD * PGDIR_SIZE;
/*
* TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
* out
*/
task_size = host_task_size & PGDIR_MASK;
task_size = task_size & PGDIR_MASK;
/* OS sanity checks that need to happen before the kernel runs */
os_early_checks();
@ -366,18 +372,15 @@ int __init linux_main(int argc, char **argv)
setup_machinename(init_utsname()->machine);
highmem = 0;
physmem_size = (physmem_size + PAGE_SIZE - 1) & PAGE_MASK;
iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
/*
* Zones have to begin on a 1 << MAX_PAGE_ORDER page boundary,
* so this makes sure that's true for highmem
*/
max_physmem &= ~((1 << (PAGE_SHIFT + MAX_PAGE_ORDER)) - 1);
if (physmem_size + iomem_size > max_physmem) {
highmem = physmem_size + iomem_size - max_physmem;
physmem_size -= highmem;
physmem_size = max_physmem - iomem_size;
os_info("Physical memory size shrunk to %llu bytes\n",
physmem_size);
}
high_physmem = uml_physmem + physmem_size;
@ -398,6 +401,8 @@ int __init linux_main(int argc, char **argv)
os_info("Kernel virtual memory size shrunk to %lu bytes\n",
virtmem_size);
arch_task_struct_size = sizeof(struct task_struct) + host_fp_size;
os_flush_stdout();
return start_uml();
@ -412,9 +417,9 @@ void __init setup_arch(char **cmdline_p)
{
u8 rng_seed[32];
stack_protections((unsigned long) &init_thread_info);
setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
mem_total_pages(physmem_size, iomem_size, highmem);
stack_protections((unsigned long) init_task.stack);
setup_physmem(uml_physmem, uml_reserved, physmem_size);
mem_total_pages(physmem_size, iomem_size);
uml_dtb_init();
read_initrd();

2
arch/um/kernel/uml.lds.S
View File

@ -77,8 +77,6 @@ SECTIONS
.data :
{
INIT_TASK_DATA(KERNEL_STACK_SIZE)
. = ALIGN(KERNEL_STACK_SIZE);
*(.data..init_irqstack)
DATA_DATA
*(.gnu.linkonce.d*)
CONSTRUCTORS

2
arch/um/os-Linux/Makefile
View File

@ -12,6 +12,8 @@ obj-y = execvp.o file.o helper.o irq.o main.o mem.o process.o \
CFLAGS_signal.o += -Wframe-larger-than=4096
CFLAGS_main.o += -Wno-frame-larger-than
obj-$(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) += elf_aux.o
USER_OBJS := $(user-objs-y) elf_aux.o execvp.o file.o helper.o irq.o \

6
arch/um/os-Linux/file.c
View File

@ -255,12 +255,6 @@ void os_close_file(int fd)
{
close(fd);
}
int os_fsync_file(int fd)
{
if (fsync(fd) < 0)
return -errno;
return 0;
}
int os_seek_file(int fd, unsigned long long offset)
{

23
arch/um/os-Linux/main.c
View File

@ -11,6 +11,7 @@
#include <signal.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/personality.h>
#include <as-layout.h>
#include <init.h>
#include <kern_util.h>
@ -108,6 +109,21 @@ int __init main(int argc, char **argv, char **envp)
char **new_argv;
int ret, i, err;
/* Disable randomization and re-exec if it was changed successfully */
ret = personality(PER_LINUX | ADDR_NO_RANDOMIZE);
if (ret >= 0 && (ret & (PER_LINUX | ADDR_NO_RANDOMIZE)) !=
(PER_LINUX | ADDR_NO_RANDOMIZE)) {
char buf[4096] = {};
ssize_t ret;
ret = readlink("/proc/self/exe", buf, sizeof(buf));
if (ret < 0 || ret >= sizeof(buf)) {
perror("readlink failure");
exit(1);
}
execve(buf, argv, envp);
}
set_stklim();
setup_env_path();
@ -140,7 +156,7 @@ int __init main(int argc, char **argv, char **envp)
#endif
change_sig(SIGPIPE, 0);
ret = linux_main(argc, argv);
ret = linux_main(argc, argv, envp);
/*
* Disable SIGPROF - I have no idea why libc doesn't do this or turn
@ -182,6 +198,7 @@ int __init main(int argc, char **argv, char **envp)
}
extern void *__real_malloc(int);
extern void __real_free(void *);
/* workaround for -Wmissing-prototypes warnings */
void *__wrap_malloc(int size);
@ -219,10 +236,6 @@ void *__wrap_calloc(int n, int size)
return ptr;
}
extern void __real_free(void *);
extern unsigned long high_physmem;
void __wrap_free(void *ptr)
{
unsigned long addr = (unsigned long) ptr;

14
arch/um/os-Linux/mem.c
View File

@ -39,10 +39,22 @@ void kasan_map_memory(void *start, size_t len)
strerror(errno));
exit(1);
}
if (madvise(start, len, MADV_DONTDUMP)) {
os_info("Couldn't set MAD_DONTDUMP on shadow memory: %s\n.",
strerror(errno));
exit(1);
}
if (madvise(start, len, MADV_DONTFORK)) {
os_info("Couldn't set MADV_DONTFORK on shadow memory: %s\n.",
strerror(errno));
exit(1);
}
}
/* Set by make_tempfile() during early boot. */
static char *tempdir = NULL;
char *tempdir = NULL;
/* Check if dir is on tmpfs. Return 0 if yes, -1 if no or error. */
static int __init check_tmpfs(const char *dir)

88
arch/um/os-Linux/process.c
View File

@ -12,94 +12,18 @@
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <asm/unistd.h>
#include <init.h>
#include <longjmp.h>
#include <os.h>
#define ARBITRARY_ADDR -1
#define FAILURE_PID -1
#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
#define COMM_SCANF "%*[^)])"
unsigned long os_process_pc(int pid)
{
char proc_stat[STAT_PATH_LEN], buf[256];
unsigned long pc = ARBITRARY_ADDR;
int fd, err;
sprintf(proc_stat, "/proc/%d/stat", pid);
fd = open(proc_stat, O_RDONLY, 0);
if (fd < 0) {
printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
"errno = %d\n", proc_stat, errno);
goto out;
}
CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
if (err < 0) {
printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
"err = %d\n", proc_stat, errno);
goto out_close;
}
os_close_file(fd);
pc = ARBITRARY_ADDR;
if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %lu", &pc) != 1)
printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
buf);
out_close:
close(fd);
out:
return pc;
}
int os_process_parent(int pid)
{
char stat[STAT_PATH_LEN];
char data[256];
int parent = FAILURE_PID, n, fd;
if (pid == -1)
return parent;
snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
fd = open(stat, O_RDONLY, 0);
if (fd < 0) {
printk(UM_KERN_ERR "Couldn't open '%s', errno = %d\n", stat,
errno);
return parent;
}
CATCH_EINTR(n = read(fd, data, sizeof(data)));
close(fd);
if (n < 0) {
printk(UM_KERN_ERR "Couldn't read '%s', errno = %d\n", stat,
errno);
return parent;
}
parent = FAILURE_PID;
n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
if (n != 1)
printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
return parent;
}
void os_alarm_process(int pid)
{
kill(pid, SIGALRM);
}
void os_stop_process(int pid)
{
kill(pid, SIGSTOP);
}
void os_kill_process(int pid, int reap_child)
{
kill(pid, SIGKILL);
@ -130,11 +54,6 @@ int os_getpid(void)
return syscall(__NR_getpid);
}
int os_getpgrp(void)
{
return getpgrp();
}
int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
int r, int w, int x)
{
@ -285,3 +204,8 @@ void init_new_thread_signals(void)
set_handler(SIGIO);
signal(SIGWINCH, SIG_IGN);
}
void os_set_pdeathsig(void)
{
prctl(PR_SET_PDEATHSIG, SIGKILL);
}

11
arch/um/os-Linux/registers.c
View File

@ -10,11 +10,12 @@
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <registers.h>
#include <stdlib.h>
/* This is set once at boot time and not changed thereafter */
static unsigned long exec_regs[MAX_REG_NR];
static unsigned long exec_fp_regs[FP_SIZE];
static unsigned long *exec_fp_regs;
int init_pid_registers(int pid)
{
@ -24,7 +25,11 @@ int init_pid_registers(int pid)
if (err < 0)
return -errno;
arch_init_registers(pid);
err = arch_init_registers(pid);
if (err < 0)
return err;
exec_fp_regs = malloc(host_fp_size);
get_fp_registers(pid, exec_fp_regs);
return 0;
}
@ -34,5 +39,5 @@ void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
memcpy(regs, exec_regs, sizeof(exec_regs));
if (fp_regs)
memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
memcpy(fp_regs, exec_fp_regs, host_fp_size);
}

1
arch/um/os-Linux/sigio.c
View File

@ -55,6 +55,7 @@ static int write_sigio_thread(void *unused)
int i, n, respond_fd;
char c;
os_set_pdeathsig();
os_fix_helper_signals();
fds = &current_poll;
while (1) {

55
arch/um/os-Linux/signal.c
View File

@ -26,7 +26,7 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGFPE] = relay_signal,
[SIGILL] = relay_signal,
[SIGWINCH] = winch,
[SIGBUS] = bus_handler,
[SIGBUS] = relay_signal,
[SIGSEGV] = segv_handler,
[SIGIO] = sigio_handler,
};
@ -65,7 +65,7 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
#define SIGALRM_MASK (1 << SIGALRM_BIT)
int signals_enabled;
#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT
#if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT)
static int signals_blocked, signals_blocked_pending;
#endif
static unsigned int signals_pending;
@ -75,7 +75,7 @@ static void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
{
int enabled = signals_enabled;
#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT
#if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT)
if ((signals_blocked ||
__atomic_load_n(&signals_blocked_pending, __ATOMIC_SEQ_CST)) &&
(sig == SIGIO)) {
@ -190,43 +190,8 @@ static void hard_handler(int sig, siginfo_t *si, void *p)
{
ucontext_t *uc = p;
mcontext_t *mc = &uc->uc_mcontext;
unsigned long pending = 1UL << sig;
do {
int nested, bail;
/*
* pending comes back with one bit set for each
* interrupt that arrived while setting up the stack,
* plus a bit for this interrupt, plus the zero bit is
* set if this is a nested interrupt.
* If bail is true, then we interrupted another
* handler setting up the stack. In this case, we
* have to return, and the upper handler will deal
* with this interrupt.
*/
bail = to_irq_stack(&pending);
if (bail)
return;
nested = pending & 1;
pending &= ~1;
while ((sig = ffs(pending)) != 0){
sig--;
pending &= ~(1 << sig);
(*handlers[sig])(sig, (struct siginfo *)si, mc);
}
/*
* Again, pending comes back with a mask of signals
* that arrived while tearing down the stack. If this
* is non-zero, we just go back, set up the stack
* again, and handle the new interrupts.
*/
if (!nested)
pending = from_irq_stack(nested);
} while (pending);
(*handlers[sig])(sig, (struct siginfo *)si, mc);
}
void set_handler(int sig)
@ -297,7 +262,7 @@ void unblock_signals(void)
return;
signals_enabled = 1;
#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT
#if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT)
deliver_time_travel_irqs();
#endif
@ -389,7 +354,7 @@ int um_set_signals_trace(int enable)
return ret;
}
#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT
#if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT)
void mark_sigio_pending(void)
{
/*
@ -487,11 +452,3 @@ void unblock_signals_hard(void)
unblocking = false;
}
#endif
int os_is_signal_stack(void)
{
stack_t ss;
sigaltstack(NULL, &ss);
return ss.ss_flags & SS_ONSTACK;
}

21
arch/um/os-Linux/skas/mem.c
View File

@ -217,24 +217,3 @@ int unmap(struct mm_id *mm_idp, unsigned long addr, unsigned long len)
return 0;
}
int protect(struct mm_id *mm_idp, unsigned long addr, unsigned long len,
unsigned int prot)
{
struct stub_syscall *sc;
/* Compress with previous syscall if that is possible */
sc = syscall_stub_get_previous(mm_idp, STUB_SYSCALL_MPROTECT, addr);
if (sc && sc->mem.prot == prot) {
sc->mem.length += len;
return 0;
}
sc = syscall_stub_alloc(mm_idp);
sc->syscall = STUB_SYSCALL_MPROTECT;
sc->mem.addr = addr;
sc->mem.length = len;
sc->mem.prot = prot;
return 0;
}

225
arch/um/os-Linux/skas/process.c
View File

@ -10,8 +10,11 @@
#include <sched.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <mem_user.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <asm/unistd.h>
#include <as-layout.h>
#include <init.h>
@ -141,16 +144,10 @@ void wait_stub_done(int pid)
extern unsigned long current_stub_stack(void);
static void get_skas_faultinfo(int pid, struct faultinfo *fi, unsigned long *aux_fp_regs)
static void get_skas_faultinfo(int pid, struct faultinfo *fi)
{
int err;
err = get_fp_registers(pid, aux_fp_regs);
if (err < 0) {
printk(UM_KERN_ERR "save_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
if (err) {
printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
@ -164,18 +161,11 @@ static void get_skas_faultinfo(int pid, struct faultinfo *fi, unsigned long *aux
* the stub stack page. We just have to copy it.
*/
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
err = put_fp_registers(pid, aux_fp_regs);
if (err < 0) {
printk(UM_KERN_ERR "put_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
}
static void handle_segv(int pid, struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
static void handle_segv(int pid, struct uml_pt_regs *regs)
{
get_skas_faultinfo(pid, &regs->faultinfo, aux_fp_regs);
get_skas_faultinfo(pid, &regs->faultinfo);
segv(regs->faultinfo, 0, 1, NULL);
}
@ -189,69 +179,131 @@ static void handle_trap(int pid, struct uml_pt_regs *regs)
extern char __syscall_stub_start[];
/**
* userspace_tramp() - userspace trampoline
* @stack: pointer to the new userspace stack page
*
* The userspace trampoline is used to setup a new userspace process in start_userspace() after it was clone()'ed.
* This function will run on a temporary stack page.
* It ptrace()'es itself, then
* Two pages are mapped into the userspace address space:
* - STUB_CODE (with EXEC), which contains the skas stub code
* - STUB_DATA (with R/W), which contains a data page that is used to transfer certain data between the UML userspace process and the UML kernel.
* Also for the userspace process a SIGSEGV handler is installed to catch pagefaults in the userspace process.
* And last the process stops itself to give control to the UML kernel for this userspace process.
*
* Return: Always zero, otherwise the current userspace process is ended with non null exit() call
*/
static int stub_exe_fd;
static int userspace_tramp(void *stack)
{
struct sigaction sa;
void *addr;
int fd;
char *const argv[] = { "uml-userspace", NULL };
int pipe_fds[2];
unsigned long long offset;
unsigned long segv_handler = STUB_CODE +
(unsigned long) stub_segv_handler -
(unsigned long) __syscall_stub_start;
struct stub_init_data init_data = {
.stub_start = STUB_START,
.segv_handler = STUB_CODE +
(unsigned long) stub_segv_handler -
(unsigned long) __syscall_stub_start,
};
struct iomem_region *iomem;
int ret;
ptrace(PTRACE_TRACEME, 0, 0, 0);
init_data.stub_code_fd = phys_mapping(uml_to_phys(__syscall_stub_start),
&offset);
init_data.stub_code_offset = MMAP_OFFSET(offset);
signal(SIGTERM, SIG_DFL);
signal(SIGWINCH, SIG_IGN);
init_data.stub_data_fd = phys_mapping(uml_to_phys(stack), &offset);
init_data.stub_data_offset = MMAP_OFFSET(offset);
fd = phys_mapping(uml_to_phys(__syscall_stub_start), &offset);
addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
if (addr == MAP_FAILED) {
os_info("mapping mmap stub at 0x%lx failed, errno = %d\n",
STUB_CODE, errno);
exit(1);
/* Set CLOEXEC on all FDs and then unset on all memory related FDs */
close_range(0, ~0U, CLOSE_RANGE_CLOEXEC);
fcntl(init_data.stub_data_fd, F_SETFD, 0);
for (iomem = iomem_regions; iomem; iomem = iomem->next)
fcntl(iomem->fd, F_SETFD, 0);
/* Create a pipe for init_data (no CLOEXEC) and dup2 to STDIN */
if (pipe(pipe_fds))
exit(2);
if (dup2(pipe_fds[0], 0) < 0)
exit(3);
close(pipe_fds[0]);
/* Write init_data and close write side */
ret = write(pipe_fds[1], &init_data, sizeof(init_data));
close(pipe_fds[1]);
if (ret != sizeof(init_data))
exit(4);
execveat(stub_exe_fd, "", argv, NULL, AT_EMPTY_PATH);
exit(5);
}
extern char stub_exe_start[];
extern char stub_exe_end[];
extern char *tempdir;
#define STUB_EXE_NAME_TEMPLATE "/uml-userspace-XXXXXX"
#ifndef MFD_EXEC
#define MFD_EXEC 0x0010U
#endif
static int __init init_stub_exe_fd(void)
{
size_t written = 0;
char *tmpfile = NULL;
stub_exe_fd = memfd_create("uml-userspace",
MFD_EXEC | MFD_CLOEXEC | MFD_ALLOW_SEALING);
if (stub_exe_fd < 0) {
printk(UM_KERN_INFO "Could not create executable memfd, using temporary file!");
tmpfile = malloc(strlen(tempdir) +
strlen(STUB_EXE_NAME_TEMPLATE) + 1);
if (tmpfile == NULL)
panic("Failed to allocate memory for stub binary name");
strcpy(tmpfile, tempdir);
strcat(tmpfile, STUB_EXE_NAME_TEMPLATE);
stub_exe_fd = mkstemp(tmpfile);
if (stub_exe_fd < 0)
panic("Could not create temporary file for stub binary: %d",
-errno);
}
fd = phys_mapping(uml_to_phys(stack), &offset);
addr = mmap((void *) STUB_DATA,
STUB_DATA_PAGES * UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if (addr == MAP_FAILED) {
os_info("mapping segfault stack at 0x%lx failed, errno = %d\n",
STUB_DATA, errno);
exit(1);
while (written < stub_exe_end - stub_exe_start) {
ssize_t res = write(stub_exe_fd, stub_exe_start + written,
stub_exe_end - stub_exe_start - written);
if (res < 0) {
if (errno == EINTR)
continue;
if (tmpfile)
unlink(tmpfile);
panic("Failed write stub binary: %d", -errno);
}
written += res;
}
set_sigstack((void *) STUB_DATA, STUB_DATA_PAGES * UM_KERN_PAGE_SIZE);
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO;
sa.sa_sigaction = (void *) segv_handler;
sa.sa_restorer = NULL;
if (sigaction(SIGSEGV, &sa, NULL) < 0) {
os_info("%s - setting SIGSEGV handler failed - errno = %d\n",
__func__, errno);
exit(1);
if (!tmpfile) {
fcntl(stub_exe_fd, F_ADD_SEALS,
F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_SEAL);
} else {
if (fchmod(stub_exe_fd, 00500) < 0) {
unlink(tmpfile);
panic("Could not make stub binary executable: %d",
-errno);
}
close(stub_exe_fd);
stub_exe_fd = open(tmpfile, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
if (stub_exe_fd < 0) {
unlink(tmpfile);
panic("Could not reopen stub binary: %d", -errno);
}
unlink(tmpfile);
free(tmpfile);
}
kill(os_getpid(), SIGSTOP);
return 0;
}
__initcall(init_stub_exe_fd);
int userspace_pid[NR_CPUS];
@ -270,7 +322,7 @@ int start_userspace(unsigned long stub_stack)
{
void *stack;
unsigned long sp;
int pid, status, n, flags, err;
int pid, status, n, err;
/* setup a temporary stack page */
stack = mmap(NULL, UM_KERN_PAGE_SIZE,
@ -286,10 +338,10 @@ int start_userspace(unsigned long stub_stack)
/* set stack pointer to the end of the stack page, so it can grow downwards */
sp = (unsigned long)stack + UM_KERN_PAGE_SIZE;
flags = CLONE_FILES | SIGCHLD;
/* clone into new userspace process */
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
pid = clone(userspace_tramp, (void *) sp,
CLONE_VFORK | CLONE_VM | SIGCHLD,
(void *)stub_stack);
if (pid < 0) {
err = -errno;
printk(UM_KERN_ERR "%s : clone failed, errno = %d\n",
@ -336,7 +388,10 @@ int start_userspace(unsigned long stub_stack)
return err;
}
void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
int unscheduled_userspace_iterations;
extern unsigned long tt_extra_sched_jiffies;
void userspace(struct uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
siginfo_t si;
@ -345,6 +400,29 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
interrupt_end();
while (1) {
/*
* When we are in time-travel mode, userspace can theoretically
* do a *lot* of work without being scheduled. The problem with
* this is that it will prevent kernel bookkeeping (primarily
* the RCU) from running and this can for example cause OOM
* situations.
*
* This code accounts a jiffie against the scheduling clock
* after the defined userspace iterations in the same thread.
* By doing so the situation is effectively prevented.
*/
if (time_travel_mode == TT_MODE_INFCPU ||
time_travel_mode == TT_MODE_EXTERNAL) {
#ifdef CONFIG_UML_MAX_USERSPACE_ITERATIONS
if (CONFIG_UML_MAX_USERSPACE_ITERATIONS &&
unscheduled_userspace_iterations++ >
CONFIG_UML_MAX_USERSPACE_ITERATIONS) {
tt_extra_sched_jiffies += 1;
unscheduled_userspace_iterations = 0;
}
#endif
}
time_travel_print_bc_msg();
current_mm_sync();
@ -435,11 +513,11 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
case SIGSEGV:
if (PTRACE_FULL_FAULTINFO) {
get_skas_faultinfo(pid,
&regs->faultinfo, aux_fp_regs);
&regs->faultinfo);
(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
regs);
}
else handle_segv(pid, regs, aux_fp_regs);
else handle_segv(pid, regs);
break;
case SIGTRAP + 0x80:
handle_trap(pid, regs);
@ -487,6 +565,8 @@ void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
void switch_threads(jmp_buf *me, jmp_buf *you)
{
unscheduled_userspace_iterations = 0;
if (UML_SETJMP(me) == 0)
UML_LONGJMP(you, 1);
}
@ -570,6 +650,7 @@ static bool noreboot;
static int __init noreboot_cmd_param(char *str, int *add)
{
*add = 0;
noreboot = true;
return 0;
}

2
arch/um/os-Linux/umid.c
View File

@ -358,6 +358,8 @@ char *get_umid(void)
static int __init set_uml_dir(char *name, int *add)
{
*add = 0;
if (*name == '\0') {
os_warn("uml_dir can't be an empty string\n");
return 0;

4
arch/um/os-Linux/util.c
View File

@ -52,8 +52,8 @@ void setup_machinename(char *machine_out)
struct utsname host;
uname(&host);
#ifdef UML_CONFIG_UML_X86
# ifndef UML_CONFIG_64BIT
#if IS_ENABLED(CONFIG_UML_X86)
# if !IS_ENABLED(CONFIG_64BIT)
if (!strcmp(host.machine, "x86_64")) {
strcpy(machine_out, "i686");
return;

12
arch/x86/um/Kconfig
View File

@ -10,6 +10,7 @@ config UML_X86
def_bool y
select ARCH_BINFMT_ELF_EXTRA_PHDRS if X86_32
select DCACHE_WORD_ACCESS
select HAVE_EFFICIENT_UNALIGNED_ACCESS
config 64BIT
bool "64-bit kernel" if "$(SUBARCH)" = "x86"
@ -28,17 +29,6 @@ config X86_64
def_bool 64BIT
select MODULES_USE_ELF_RELA
config 3_LEVEL_PGTABLES
bool "Three-level pagetables" if !64BIT
default 64BIT
help
Three-level pagetables will let UML have more than 4G of physical
memory. All the memory that can't be mapped directly will be treated
as high memory.
However, this it experimental on 32-bit architectures, so if unsure say
N (on x86-64 it's automatically enabled, instead, as it's safe there).
config ARCH_HAS_SC_SIGNALS
def_bool !64BIT

2
arch/x86/um/Makefile
View File

@ -10,7 +10,7 @@ else
endif
obj-y = bugs_$(BITS).o delay.o fault.o \
ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \
ptrace.o ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \
stub_segv.o \
sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \
mem_$(BITS).o subarch.o os-Linux/

2
arch/x86/um/asm/elf.h
View File

@ -8,6 +8,8 @@
#include <asm/user.h>
#include <skas.h>
#define CORE_DUMP_USE_REGSET
#ifdef CONFIG_X86_32
#define R_386_NONE 0

10
arch/x86/um/asm/ptrace.h
View File

@ -2,6 +2,16 @@
#ifndef __UM_X86_PTRACE_H
#define __UM_X86_PTRACE_H
/* This is here because signal.c needs the REGSET_FP_LEGACY definition */
enum {
REGSET_GENERAL,
#ifdef CONFIG_X86_32
REGSET_FP_LEGACY,
#endif
REGSET_FP,
REGSET_XSTATE,
};
#include <linux/compiler.h>
#ifndef CONFIG_X86_32
#define __FRAME_OFFSETS /* Needed to get the R* macros */

2
arch/x86/um/os-Linux/Makefile
View File

@ -3,7 +3,7 @@
# Licensed under the GPL
#
obj-y = registers.o task_size.o mcontext.o
obj-y = registers.o mcontext.o
obj-$(CONFIG_X86_32) += tls.o

147
arch/x86/um/os-Linux/registers.c
View File

@ -16,132 +16,57 @@
#include <asm/sigcontext.h>
#include <linux/elf.h>
#include <registers.h>
#include <sys/mman.h>
static int have_xstate_support;
int save_i387_registers(int pid, unsigned long *fp_regs)
{
if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
return -errno;
return 0;
}
int save_fp_registers(int pid, unsigned long *fp_regs)
{
#ifdef PTRACE_GETREGSET
struct iovec iov;
if (have_xstate_support) {
iov.iov_base = fp_regs;
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
} else
#endif
return save_i387_registers(pid, fp_regs);
}
int restore_i387_registers(int pid, unsigned long *fp_regs)
{
if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
return -errno;
return 0;
}
int restore_fp_registers(int pid, unsigned long *fp_regs)
{
#ifdef PTRACE_SETREGSET
struct iovec iov;
if (have_xstate_support) {
iov.iov_base = fp_regs;
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
} else
#endif
return restore_i387_registers(pid, fp_regs);
}
#ifdef __i386__
int have_fpx_regs = 1;
int save_fpx_registers(int pid, unsigned long *fp_regs)
{
if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
return -errno;
return 0;
}
int restore_fpx_registers(int pid, unsigned long *fp_regs)
{
if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
return -errno;
return 0;
}
unsigned long host_fp_size;
int get_fp_registers(int pid, unsigned long *regs)
{
if (have_fpx_regs)
return save_fpx_registers(pid, regs);
else
return save_fp_registers(pid, regs);
struct iovec iov = {
.iov_base = regs,
.iov_len = host_fp_size,
};
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
}
int put_fp_registers(int pid, unsigned long *regs)
{
if (have_fpx_regs)
return restore_fpx_registers(pid, regs);
else
return restore_fp_registers(pid, regs);
struct iovec iov = {
.iov_base = regs,
.iov_len = host_fp_size,
};
if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
}
void arch_init_registers(int pid)
int arch_init_registers(int pid)
{
struct user_fpxregs_struct fpx_regs;
int err;
struct iovec iov = {
/* Just use plenty of space, it does not cost us anything */
.iov_len = 2 * 1024 * 1024,
};
int ret;
err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
if (!err)
return;
iov.iov_base = mmap(NULL, iov.iov_len, PROT_WRITE | PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (iov.iov_base == MAP_FAILED)
return -ENOMEM;
if (errno != EIO)
panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
errno);
/* GDB has x86_xsave_length, which uses x86_cpuid_count */
ret = ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov);
if (ret)
ret = -errno;
munmap(iov.iov_base, 2 * 1024 * 1024);
have_fpx_regs = 0;
host_fp_size = iov.iov_len;
return ret;
}
#else
int get_fp_registers(int pid, unsigned long *regs)
{
return save_fp_registers(pid, regs);
}
int put_fp_registers(int pid, unsigned long *regs)
{
return restore_fp_registers(pid, regs);
}
void arch_init_registers(int pid)
{
#ifdef PTRACE_GETREGSET
void * fp_regs;
struct iovec iov;
fp_regs = malloc(FP_SIZE * sizeof(unsigned long));
if(fp_regs == NULL)
return;
iov.iov_base = fp_regs;
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
have_xstate_support = 1;
free(fp_regs);
#endif
}
#endif
unsigned long get_thread_reg(int reg, jmp_buf *buf)
{

151
arch/x86/um/os-Linux/task_size.c
View File

@ -1,151 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/mman.h>
#include <longjmp.h>
#ifdef __i386__
static jmp_buf buf;
static void segfault(int sig)
{
longjmp(buf, 1);
}
static int page_ok(unsigned long page)
{
unsigned long *address = (unsigned long *) (page << UM_KERN_PAGE_SHIFT);
unsigned long n = ~0UL;
void *mapped = NULL;
int ok = 0;
/*
* First see if the page is readable. If it is, it may still
* be a VDSO, so we go on to see if it's writable. If not
* then try mapping memory there. If that fails, then we're
* still in the kernel area. As a sanity check, we'll fail if
* the mmap succeeds, but gives us an address different from
* what we wanted.
*/
if (setjmp(buf) == 0)
n = *address;
else {
mapped = mmap(address, UM_KERN_PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (mapped == MAP_FAILED)
return 0;
if (mapped != address)
goto out;
}
/*
* Now, is it writeable? If so, then we're in user address
* space. If not, then try mprotecting it and try the write
* again.
*/
if (setjmp(buf) == 0) {
*address = n;
ok = 1;
goto out;
} else if (mprotect(address, UM_KERN_PAGE_SIZE,
PROT_READ | PROT_WRITE) != 0)
goto out;
if (setjmp(buf) == 0) {
*address = n;
ok = 1;
}
out:
if (mapped != NULL)
munmap(mapped, UM_KERN_PAGE_SIZE);
return ok;
}
unsigned long os_get_top_address(void)
{
struct sigaction sa, old;
unsigned long bottom = 0;
/*
* A 32-bit UML on a 64-bit host gets confused about the VDSO at
* 0xffffe000. It is mapped, is readable, can be reprotected writeable
* and written. However, exec discovers later that it can't be
* unmapped. So, just set the highest address to be checked to just
* below it. This might waste some address space on 4G/4G 32-bit
* hosts, but shouldn't hurt otherwise.
*/
unsigned long top = 0xffffd000 >> UM_KERN_PAGE_SHIFT;
unsigned long test, original;
printf("Locating the bottom of the address space ... ");
fflush(stdout);
/*
* We're going to be longjmping out of the signal handler, so
* SA_DEFER needs to be set.
*/
sa.sa_handler = segfault;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_NODEFER;
if (sigaction(SIGSEGV, &sa, &old)) {
perror("os_get_top_address");
exit(1);
}
/* Manually scan the address space, bottom-up, until we find
* the first valid page (or run out of them).
*/
for (bottom = 0; bottom < top; bottom++) {
if (page_ok(bottom))
break;
}
/* If we've got this far, we ran out of pages. */
if (bottom == top) {
fprintf(stderr, "Unable to determine bottom of address "
"space.\n");
exit(1);
}
printf("0x%lx\n", bottom << UM_KERN_PAGE_SHIFT);
printf("Locating the top of the address space ... ");
fflush(stdout);
original = bottom;
/* This could happen with a 4G/4G split */
if (page_ok(top))
goto out;
do {
test = bottom + (top - bottom) / 2;
if (page_ok(test))
bottom = test;
else
top = test;
} while (top - bottom > 1);
out:
/* Restore the old SIGSEGV handling */
if (sigaction(SIGSEGV, &old, NULL)) {
perror("os_get_top_address");
exit(1);
}
top <<= UM_KERN_PAGE_SHIFT;
printf("0x%lx\n", top);
return top;
}
#else
unsigned long os_get_top_address(void)
{
/* The old value of CONFIG_TOP_ADDR */
return 0x7fc0002000;
}
#endif

267
arch/x86/um/ptrace.c Normal file
View File

@ -0,0 +1,267 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/sched.h>
#include <linux/elf.h>
#include <linux/regset.h>
#include <asm/user32.h>
#include <asm/sigcontext.h>
#ifdef CONFIG_X86_32
/*
* FPU tag word conversions.
*/
static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
{
unsigned int tmp; /* to avoid 16 bit prefixes in the code */
/* Transform each pair of bits into 01 (valid) or 00 (empty) */
tmp = ~twd;
tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
/* and move the valid bits to the lower byte. */
tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
return tmp;
}
static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
{
struct _fpxreg *st = NULL;
unsigned long twd = (unsigned long) fxsave->twd;
unsigned long tag;
unsigned long ret = 0xffff0000;
int i;
#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16)
for (i = 0; i < 8; i++) {
if (twd & 0x1) {
st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
switch (st->exponent & 0x7fff) {
case 0x7fff:
tag = 2; /* Special */
break;
case 0x0000:
if (!st->significand[0] &&
!st->significand[1] &&
!st->significand[2] &&
!st->significand[3]) {
tag = 1; /* Zero */
} else {
tag = 2; /* Special */
}
break;
default:
if (st->significand[3] & 0x8000)
tag = 0; /* Valid */
else
tag = 2; /* Special */
break;
}
} else {
tag = 3; /* Empty */
}
ret |= (tag << (2 * i));
twd = twd >> 1;
}
return ret;
}
/* Get/set the old 32bit i387 registers (pre-FPX) */
static int fpregs_legacy_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct user_fxsr_struct *fxsave = (void *)target->thread.regs.regs.fp;
int i;
membuf_store(&to, (unsigned long)fxsave->cwd | 0xffff0000ul);
membuf_store(&to, (unsigned long)fxsave->swd | 0xffff0000ul);
membuf_store(&to, twd_fxsr_to_i387(fxsave));
membuf_store(&to, fxsave->fip);
membuf_store(&to, fxsave->fcs | ((unsigned long)fxsave->fop << 16));
membuf_store(&to, fxsave->foo);
membuf_store(&to, fxsave->fos);
for (i = 0; i < 8; i++)
membuf_write(&to, (void *)fxsave->st_space + i * 16, 10);
return 0;
}
static int fpregs_legacy_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct user_fxsr_struct *fxsave = (void *)target->thread.regs.regs.fp;
const struct user_i387_struct *from;
struct user_i387_struct buf;
int i;
if (ubuf) {
if (copy_from_user(&buf, ubuf, sizeof(buf)))
return -EFAULT;
from = &buf;
} else {
from = kbuf;
}
fxsave->cwd = (unsigned short)(from->cwd & 0xffff);
fxsave->swd = (unsigned short)(from->swd & 0xffff);
fxsave->twd = twd_i387_to_fxsr((unsigned short)(from->twd & 0xffff));
fxsave->fip = from->fip;
fxsave->fop = (unsigned short)((from->fcs & 0xffff0000ul) >> 16);
fxsave->fcs = (from->fcs & 0xffff);
fxsave->foo = from->foo;
fxsave->fos = from->fos;
for (i = 0; i < 8; i++) {
memcpy((void *)fxsave->st_space + i * 16,
(void *)from->st_space + i * 10, 10);
}
return 0;
}
#endif
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
int reg;
for (reg = 0; to.left; reg++)
membuf_store(&to, getreg(target, reg * sizeof(unsigned long)));
return 0;
}
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret = 0;
if (kbuf) {
const unsigned long *k = kbuf;
while (count >= sizeof(*k) && !ret) {
ret = putreg(target, pos, *k++);
count -= sizeof(*k);
pos += sizeof(*k);
}
} else {
const unsigned long __user *u = ubuf;
while (count >= sizeof(*u) && !ret) {
unsigned long word;
ret = __get_user(word, u++);
if (ret)
break;
ret = putreg(target, pos, word);
count -= sizeof(*u);
pos += sizeof(*u);
}
}
return ret;
}
static int generic_fpregs_active(struct task_struct *target, const struct user_regset *regset)
{
return regset->n;
}
static int generic_fpregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
void *fpregs = task_pt_regs(target)->regs.fp;
membuf_write(&to, fpregs, regset->size * regset->n);
return 0;
}
static int generic_fpregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
void *fpregs = task_pt_regs(target)->regs.fp;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs, 0, regset->size * regset->n);
}
static struct user_regset uml_regsets[] __ro_after_init = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = sizeof(struct user_regs_struct) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.regset_get = genregs_get,
.set = genregs_set
},
#ifdef CONFIG_X86_32
/* Old FP registers, they are needed in signal frames */
[REGSET_FP_LEGACY] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct user_i387_ia32_struct) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.active = generic_fpregs_active,
.regset_get = fpregs_legacy_get,
.set = fpregs_legacy_set,
},
#endif
[REGSET_FP] = {
#ifdef CONFIG_X86_32
.core_note_type = NT_PRXFPREG,
.n = sizeof(struct user32_fxsr_struct) / sizeof(long),
#else
.core_note_type = NT_PRFPREG,
.n = sizeof(struct user_i387_struct) / sizeof(long),
#endif
.size = sizeof(long),
.align = sizeof(long),
.active = generic_fpregs_active,
.regset_get = generic_fpregs_get,
.set = generic_fpregs_set,
},
[REGSET_XSTATE] = {
.core_note_type = NT_X86_XSTATE,
.size = sizeof(long),
.align = sizeof(long),
.active = generic_fpregs_active,
.regset_get = generic_fpregs_get,
.set = generic_fpregs_set,
},
/* TODO: Add TLS regset for 32bit */
};
static const struct user_regset_view user_uml_view = {
#ifdef CONFIG_X86_32
.name = "i386", .e_machine = EM_386,
#else
.name = "x86_64", .e_machine = EM_X86_64,
#endif
.regsets = uml_regsets, .n = ARRAY_SIZE(uml_regsets)
};
const struct user_regset_view *
task_user_regset_view(struct task_struct *tsk)
{
return &user_uml_view;
}
static int __init init_regset_xstate_info(void)
{
uml_regsets[REGSET_XSTATE].n =
host_fp_size / uml_regsets[REGSET_XSTATE].size;
return 0;
}
arch_initcall(init_regset_xstate_info);

84
arch/x86/um/ptrace_32.c
View File

@ -6,6 +6,7 @@
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/regset.h>
#include <asm/ptrace-abi.h>
#include <registers.h>
#include <skas.h>
@ -168,65 +169,6 @@ int peek_user(struct task_struct *child, long addr, long data)
return put_user(tmp, (unsigned long __user *) data);
}
static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = task_cpu(child);
struct user_i387_struct fpregs;
err = save_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
if (err)
return err;
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
if(n > 0)
return -EFAULT;
return n;
}
static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int n, cpu = task_cpu(child);
struct user_i387_struct fpregs;
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
if (n > 0)
return -EFAULT;
return restore_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
}
static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = task_cpu(child);
struct user_fxsr_struct fpregs;
err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
if (err)
return err;
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
if(n > 0)
return -EFAULT;
return n;
}
static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
int n, cpu = task_cpu(child);
struct user_fxsr_struct fpregs;
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
if (n > 0)
return -EFAULT;
return restore_fpx_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
}
long subarch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
@ -234,17 +176,25 @@ long subarch_ptrace(struct task_struct *child, long request,
void __user *datap = (void __user *) data;
switch (request) {
case PTRACE_GETFPREGS: /* Get the child FPU state. */
ret = get_fpregs(datap, child);
break;
return copy_regset_to_user(child, task_user_regset_view(child),
REGSET_FP_LEGACY,
0, sizeof(struct user_i387_struct),
datap);
case PTRACE_SETFPREGS: /* Set the child FPU state. */
ret = set_fpregs(datap, child);
break;
return copy_regset_from_user(child, task_user_regset_view(child),
REGSET_FP_LEGACY,
0, sizeof(struct user_i387_struct),
datap);
case PTRACE_GETFPXREGS: /* Get the child FPU state. */
ret = get_fpxregs(datap, child);
break;
return copy_regset_to_user(child, task_user_regset_view(child),
REGSET_FP,
0, sizeof(struct user_fxsr_struct),
datap);
case PTRACE_SETFPXREGS: /* Set the child FPU state. */
ret = set_fpxregs(datap, child);
break;
return copy_regset_from_user(child, task_user_regset_view(child),
REGSET_FP,
0, sizeof(struct user_fxsr_struct),
datap);
default:
ret = -EIO;
}

43
arch/x86/um/ptrace_64.c
View File

@ -8,6 +8,7 @@
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/regset.h>
#define __FRAME_OFFSETS
#include <asm/ptrace.h>
#include <linux/uaccess.h>
@ -188,36 +189,6 @@ int peek_user(struct task_struct *child, long addr, long data)
return put_user(tmp, (unsigned long *) data);
}
static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
struct user_i387_struct fpregs;
err = save_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
if (err)
return err;
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
if (n > 0)
return -EFAULT;
return n;
}
static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int n, cpu = ((struct thread_info *) child->stack)->cpu;
struct user_i387_struct fpregs;
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
if (n > 0)
return -EFAULT;
return restore_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
}
long subarch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
@ -226,11 +197,15 @@ long subarch_ptrace(struct task_struct *child, long request,
switch (request) {
case PTRACE_GETFPREGS: /* Get the child FPU state. */
ret = get_fpregs(datap, child);
break;
return copy_regset_to_user(child, task_user_regset_view(child),
REGSET_FP,
0, sizeof(struct user_i387_struct),
datap);
case PTRACE_SETFPREGS: /* Set the child FPU state. */
ret = set_fpregs(datap, child);
break;
return copy_regset_from_user(child, task_user_regset_view(child),
REGSET_FP,
0, sizeof(struct user_i387_struct),
datap);
case PTRACE_ARCH_PRCTL:
/* XXX Calls ptrace on the host - needs some SMP thinking */
ret = arch_prctl(child, data, (void __user *) addr);

8
arch/x86/um/shared/sysdep/ptrace.h
View File

@ -56,12 +56,16 @@ struct syscall_args {
UPT_SYSCALL_ARG5(r), \
UPT_SYSCALL_ARG6(r) } } )
extern unsigned long host_fp_size;
struct uml_pt_regs {
unsigned long gp[MAX_REG_NR];
unsigned long fp[MAX_FP_NR];
struct faultinfo faultinfo;
long syscall;
int is_user;
/* Dynamically sized FP registers (holds an XSTATE) */
unsigned long fp[];
};
#define EMPTY_UML_PT_REGS { }
@ -72,4 +76,6 @@ struct uml_pt_regs {
extern int user_context(unsigned long sp);
extern int arch_init_registers(int pid);
#endif /* __SYSDEP_X86_PTRACE_H */

4
arch/x86/um/shared/sysdep/ptrace_32.h
View File

@ -6,8 +6,6 @@
#ifndef __SYSDEP_I386_PTRACE_H
#define __SYSDEP_I386_PTRACE_H
#define MAX_FP_NR HOST_FPX_SIZE
#define UPT_SYSCALL_ARG1(r) UPT_BX(r)
#define UPT_SYSCALL_ARG2(r) UPT_CX(r)
#define UPT_SYSCALL_ARG3(r) UPT_DX(r)
@ -15,6 +13,4 @@
#define UPT_SYSCALL_ARG5(r) UPT_DI(r)
#define UPT_SYSCALL_ARG6(r) UPT_BP(r)
extern void arch_init_registers(int pid);
#endif

4
arch/x86/um/shared/sysdep/ptrace_64.h
View File

@ -8,8 +8,6 @@
#ifndef __SYSDEP_X86_64_PTRACE_H
#define __SYSDEP_X86_64_PTRACE_H
#define MAX_FP_NR HOST_FP_SIZE
#define REGS_R8(r) ((r)[HOST_R8])
#define REGS_R9(r) ((r)[HOST_R9])
#define REGS_R10(r) ((r)[HOST_R10])
@ -57,6 +55,4 @@
#define UPT_SYSCALL_ARG5(r) UPT_R8(r)
#define UPT_SYSCALL_ARG6(r) UPT_R9(r)
extern void arch_init_registers(int pid);
#endif

6
arch/x86/um/shared/sysdep/ptrace_user.h
View File

@ -11,12 +11,6 @@
#define REGS_IP_INDEX HOST_IP
#define REGS_SP_INDEX HOST_SP
#ifdef __i386__
#define FP_SIZE ((HOST_FPX_SIZE > HOST_FP_SIZE) ? HOST_FPX_SIZE : HOST_FP_SIZE)
#else
#define FP_SIZE HOST_FP_SIZE
#endif
/*
* glibc before 2.27 does not include PTRACE_SYSEMU_SINGLESTEP in its enum,
* ensure we have a definition by (re-)defining it here.

18
arch/x86/um/shared/sysdep/stub_32.h
View File

@ -112,11 +112,23 @@ static __always_inline void *get_stub_data(void)
unsigned long ret;
asm volatile (
"movl %%esp,%0 ;"
"andl %1,%0"
"call _here_%=;"
"_here_%=:"
"popl %0;"
"andl %1, %0 ;"
"addl %2, %0 ;"
: "=a" (ret)
: "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)));
: "g" (~(UM_KERN_PAGE_SIZE - 1)),
"g" (UM_KERN_PAGE_SIZE));
return (void *)ret;
}
#define stub_start(fn) \
asm volatile ( \
"subl %0,%%esp ;" \
"movl %1, %%eax ; " \
"call *%%eax ;" \
:: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
"i" (&fn))
#endif

27
arch/x86/um/shared/sysdep/stub_64.h
View File

@ -28,6 +28,17 @@ static __always_inline long stub_syscall0(long syscall)
return ret;
}
static __always_inline long stub_syscall1(long syscall, long arg1)
{
long ret;
__asm__ volatile (__syscall
: "=a" (ret)
: "0" (syscall), "D" (arg1) : __syscall_clobber );
return ret;
}
static __always_inline long stub_syscall2(long syscall, long arg1, long arg2)
{
long ret;
@ -106,11 +117,21 @@ static __always_inline void *get_stub_data(void)
unsigned long ret;
asm volatile (
"movq %%rsp,%0 ;"
"andq %1,%0"
"lea 0(%%rip), %0;"
"andq %1, %0 ;"
"addq %2, %0 ;"
: "=a" (ret)
: "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)));
: "g" (~(UM_KERN_PAGE_SIZE - 1)),
"g" (UM_KERN_PAGE_SIZE));
return (void *)ret;
}
#define stub_start(fn) \
asm volatile ( \
"subq %0,%%rsp ;" \
"movq %1,%%rax ;" \
"call *%%rax ;" \
:: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
"i" (&fn))
#endif

336
arch/x86/um/signal.c
View File

@ -16,145 +16,24 @@
#include <registers.h>
#include <skas.h>
#include <linux/regset.h>
#include <asm/sigframe.h>
#ifdef CONFIG_X86_32
/*
* FPU tag word conversions.
*/
static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
{
unsigned int tmp; /* to avoid 16 bit prefixes in the code */
/* Transform each pair of bits into 01 (valid) or 00 (empty) */
tmp = ~twd;
tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
/* and move the valid bits to the lower byte. */
tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
return tmp;
}
static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
{
struct _fpxreg *st = NULL;
unsigned long twd = (unsigned long) fxsave->twd;
unsigned long tag;
unsigned long ret = 0xffff0000;
int i;
#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16)
for (i = 0; i < 8; i++) {
if (twd & 0x1) {
st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
switch (st->exponent & 0x7fff) {
case 0x7fff:
tag = 2; /* Special */
break;
case 0x0000:
if ( !st->significand[0] &&
!st->significand[1] &&
!st->significand[2] &&
!st->significand[3] ) {
tag = 1; /* Zero */
} else {
tag = 2; /* Special */
}
break;
default:
if (st->significand[3] & 0x8000) {
tag = 0; /* Valid */
} else {
tag = 2; /* Special */
}
break;
}
} else {
tag = 3; /* Empty */
}
ret |= (tag << (2 * i));
twd = twd >> 1;
}
return ret;
}
static int convert_fxsr_to_user(struct _fpstate __user *buf,
struct user_fxsr_struct *fxsave)
{
unsigned long env[7];
struct _fpreg __user *to;
struct _fpxreg *from;
int i;
env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
env[2] = twd_fxsr_to_i387(fxsave);
env[3] = fxsave->fip;
env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
env[5] = fxsave->foo;
env[6] = fxsave->fos;
if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
return 1;
to = &buf->_st[0];
from = (struct _fpxreg *) &fxsave->st_space[0];
for (i = 0; i < 8; i++, to++, from++) {
unsigned long __user *t = (unsigned long __user *)to;
unsigned long *f = (unsigned long *)from;
if (__put_user(*f, t) ||
__put_user(*(f + 1), t + 1) ||
__put_user(from->exponent, &to->exponent))
return 1;
}
return 0;
}
static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
struct _fpstate __user *buf)
{
unsigned long env[7];
struct _fpxreg *to;
struct _fpreg __user *from;
int i;
if (copy_from_user( env, buf, 7 * sizeof(long)))
return 1;
fxsave->cwd = (unsigned short)(env[0] & 0xffff);
fxsave->swd = (unsigned short)(env[1] & 0xffff);
fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
fxsave->fip = env[3];
fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
fxsave->fcs = (env[4] & 0xffff);
fxsave->foo = env[5];
fxsave->fos = env[6];
to = (struct _fpxreg *) &fxsave->st_space[0];
from = &buf->_st[0];
for (i = 0; i < 8; i++, to++, from++) {
unsigned long *t = (unsigned long *)to;
unsigned long __user *f = (unsigned long __user *)from;
if (__get_user(*t, f) ||
__get_user(*(t + 1), f + 1) ||
__get_user(to->exponent, &from->exponent))
return 1;
}
return 0;
}
extern int have_fpx_regs;
struct _xstate_64 {
struct _fpstate_64 fpstate;
struct _header xstate_hdr;
struct _ymmh_state ymmh;
/* New processor state extensions go here: */
};
#else
#define _xstate_64 _xstate
#endif
static int copy_sc_from_user(struct pt_regs *regs,
struct sigcontext __user *from)
{
struct _xstate_64 __user *from_fp64;
struct sigcontext sc;
int err;
@ -203,35 +82,27 @@ static int copy_sc_from_user(struct pt_regs *regs,
#undef GETREG
#ifdef CONFIG_X86_32
if (have_fpx_regs) {
struct user_fxsr_struct fpx;
int pid = userspace_pid[current_thread_info()->cpu];
err = copy_from_user(&fpx,
&((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
sizeof(struct user_fxsr_struct));
if (err)
return 1;
err = convert_fxsr_from_user(&fpx, (void *)sc.fpstate);
if (err)
return 1;
err = restore_fpx_registers(pid, (unsigned long *) &fpx);
if (err < 0) {
printk(KERN_ERR "copy_sc_from_user - "
"restore_fpx_registers failed, errno = %d\n",
-err);
return 1;
}
} else
from_fp64 = ((void __user *)sc.fpstate) +
offsetof(struct _fpstate_32, _fxsr_env);
#else
from_fp64 = (void __user *)sc.fpstate;
#endif
{
err = copy_from_user(regs->regs.fp, (void *)sc.fpstate,
sizeof(struct _xstate));
if (err)
return 1;
}
err = copy_from_user(regs->regs.fp, from_fp64, host_fp_size);
if (err)
return 1;
#ifdef CONFIG_X86_32
/* Data is duplicated and this copy is the important one */
err = copy_regset_from_user(current,
task_user_regset_view(current),
REGSET_FP_LEGACY, 0,
sizeof(struct user_i387_struct),
(void __user *)sc.fpstate);
if (err < 0)
return err;
#endif
return 0;
}
@ -239,6 +110,7 @@ static int copy_sc_to_user(struct sigcontext __user *to,
struct _xstate __user *to_fp, struct pt_regs *regs,
unsigned long mask)
{
struct _xstate_64 __user *to_fp64;
struct sigcontext sc;
struct faultinfo * fi = &current->thread.arch.faultinfo;
int err;
@ -290,35 +162,46 @@ static int copy_sc_to_user(struct sigcontext __user *to,
return 1;
#ifdef CONFIG_X86_32
if (have_fpx_regs) {
int pid = userspace_pid[current_thread_info()->cpu];
struct user_fxsr_struct fpx;
err = copy_regset_to_user(current,
task_user_regset_view(current),
REGSET_FP_LEGACY, 0,
sizeof(struct _fpstate_32), to_fp);
if (err < 0)
return err;
err = save_fpx_registers(pid, (unsigned long *) &fpx);
if (err < 0){
printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
"failed, errno = %d\n", err);
return 1;
}
__put_user(X86_FXSR_MAGIC, &to_fp->fpstate.magic);
err = convert_fxsr_to_user(&to_fp->fpstate, &fpx);
if (err)
return 1;
BUILD_BUG_ON(offsetof(struct _xstate, xstate_hdr) !=
offsetof(struct _xstate_64, xstate_hdr) +
offsetof(struct _fpstate_32, _fxsr_env));
to_fp64 = (void __user *)to_fp +
offsetof(struct _fpstate_32, _fxsr_env);
#else
to_fp64 = to_fp;
#endif /* CONFIG_X86_32 */
err |= __put_user(fpx.swd, &to_fp->fpstate.status);
err |= __put_user(X86_FXSR_MAGIC, &to_fp->fpstate.magic);
if (err)
return 1;
if (copy_to_user(to_fp64, regs->regs.fp, host_fp_size))
return 1;
if (copy_to_user(&to_fp->fpstate._fxsr_env[0], &fpx,
sizeof(struct user_fxsr_struct)))
return 1;
} else
/*
* Put magic/size values for userspace. We do not bother to verify them
* later on, however, userspace needs them should it try to read the
* XSTATE data. And ptrace does not fill in these parts.
*/
BUILD_BUG_ON(sizeof(int) != FP_XSTATE_MAGIC2_SIZE);
#ifdef CONFIG_X86_32
__put_user(offsetof(struct _fpstate_32, _fxsr_env) +
host_fp_size + FP_XSTATE_MAGIC2_SIZE,
&to_fp64->fpstate.sw_reserved.extended_size);
#else
__put_user(host_fp_size + FP_XSTATE_MAGIC2_SIZE,
&to_fp64->fpstate.sw_reserved.extended_size);
#endif
{
if (copy_to_user(to_fp, regs->regs.fp, sizeof(struct _xstate)))
return 1;
}
__put_user(host_fp_size, &to_fp64->fpstate.sw_reserved.xstate_size);
__put_user(FP_XSTATE_MAGIC1, &to_fp64->fpstate.sw_reserved.magic1);
__put_user(FP_XSTATE_MAGIC2,
(int __user *)((void __user *)to_fp64 + host_fp_size));
return 0;
}
@ -336,34 +219,15 @@ static int copy_ucontext_to_user(struct ucontext __user *uc,
return err;
}
struct sigframe
{
char __user *pretcode;
int sig;
struct sigcontext sc;
struct _xstate fpstate;
unsigned long extramask[_NSIG_WORDS-1];
char retcode[8];
};
struct rt_sigframe
{
char __user *pretcode;
int sig;
struct siginfo __user *pinfo;
void __user *puc;
struct siginfo info;
struct ucontext uc;
struct _xstate fpstate;
char retcode[8];
};
int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig,
struct pt_regs *regs, sigset_t *mask)
{
size_t math_size = offsetof(struct _fpstate_32, _fxsr_env) +
host_fp_size + FP_XSTATE_MAGIC2_SIZE;
struct sigframe __user *frame;
void __user *restorer;
int err = 0, sig = ksig->sig;
unsigned long fp_to;
/* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
stack_top = ((stack_top + 4) & -16UL) - 4;
@ -371,13 +235,21 @@ int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig,
if (!access_ok(frame, sizeof(*frame)))
return 1;
/* Add required space for math frame */
frame = (struct sigframe __user *)((unsigned long)frame - math_size);
restorer = frame->retcode;
if (ksig->ka.sa.sa_flags & SA_RESTORER)
restorer = ksig->ka.sa.sa_restorer;
err |= __put_user(restorer, &frame->pretcode);
err |= __put_user(restorer, (void __user * __user *)&frame->pretcode);
err |= __put_user(sig, &frame->sig);
err |= copy_sc_to_user(&frame->sc, &frame->fpstate, regs, mask->sig[0]);
fp_to = (unsigned long)frame + sizeof(*frame);
err |= copy_sc_to_user(&frame->sc,
(struct _xstate __user *)fp_to,
regs, mask->sig[0]);
if (_NSIG_WORDS > 1)
err |= __copy_to_user(&frame->extramask, &mask->sig[1],
sizeof(frame->extramask));
@ -407,26 +279,35 @@ int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig,
int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
struct pt_regs *regs, sigset_t *mask)
{
size_t math_size = offsetof(struct _fpstate_32, _fxsr_env) +
host_fp_size + FP_XSTATE_MAGIC2_SIZE;
struct rt_sigframe __user *frame;
void __user *restorer;
int err = 0, sig = ksig->sig;
unsigned long fp_to;
stack_top &= -8UL;
frame = (struct rt_sigframe __user *) stack_top - 1;
if (!access_ok(frame, sizeof(*frame)))
return 1;
/* Add required space for math frame */
frame = (struct rt_sigframe __user *)((unsigned long)frame - math_size);
restorer = frame->retcode;
if (ksig->ka.sa.sa_flags & SA_RESTORER)
restorer = ksig->ka.sa.sa_restorer;
err |= __put_user(restorer, &frame->pretcode);
err |= __put_user(restorer, (void __user * __user *)&frame->pretcode);
err |= __put_user(sig, &frame->sig);
err |= __put_user(&frame->info, &frame->pinfo);
err |= __put_user(&frame->uc, &frame->puc);
err |= __put_user(&frame->info, (void __user * __user *)&frame->pinfo);
err |= __put_user(&frame->uc, (void __user * __user *)&frame->puc);
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
PT_REGS_SP(regs));
fp_to = (unsigned long)frame + sizeof(*frame);
err |= copy_ucontext_to_user(&frame->uc, (struct _xstate __user *)fp_to,
mask, PT_REGS_SP(regs));
/*
* This is movl $,%eax ; int $0x80
@ -478,27 +359,24 @@ SYSCALL_DEFINE0(sigreturn)
#else
struct rt_sigframe
{
char __user *pretcode;
struct ucontext uc;
struct siginfo info;
struct _xstate fpstate;
};
int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
struct pt_regs *regs, sigset_t *set)
{
unsigned long math_size = host_fp_size + FP_XSTATE_MAGIC2_SIZE;
struct rt_sigframe __user *frame;
int err = 0, sig = ksig->sig;
unsigned long fp_to;
frame = (struct rt_sigframe __user *)
round_down(stack_top - sizeof(struct rt_sigframe), 16);
/* Add required space for math frame */
frame = (struct rt_sigframe __user *)((unsigned long)frame - math_size);
/* Subtract 128 for a red zone and 8 for proper alignment */
frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
if (!access_ok(frame, sizeof(*frame)))
if (!access_ok(frame, sizeof(*frame) + math_size))
goto out;
if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
@ -509,12 +387,14 @@ int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(NULL, &frame->uc.uc_link);
err |= __save_altstack(&frame->uc.uc_stack, PT_REGS_SP(regs));
err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
set->sig[0]);
fp_to = (unsigned long)&frame->fpstate;
fp_to = (unsigned long)frame + sizeof(*frame);
err |= copy_sc_to_user(&frame->uc.uc_mcontext,
(struct _xstate __user *)fp_to,
regs, set->sig[0]);
err |= __put_user(fp_to, &frame->uc.uc_mcontext.fpstate);
if (sizeof(*set) == 16) {
@ -531,7 +411,7 @@ int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
*/
/* x86-64 should always use SA_RESTORER. */
if (ksig->ka.sa.sa_flags & SA_RESTORER)
err |= __put_user((void *)ksig->ka.sa.sa_restorer,
err |= __put_user((void __user *)ksig->ka.sa.sa_restorer,
&frame->pretcode);
else
/* could use a vstub here */

8
arch/x86/um/user-offsets.c
View File

@ -20,9 +20,6 @@ void foo(void);
void foo(void)
{
#ifdef __i386__
DEFINE_LONGS(HOST_FP_SIZE, sizeof(struct user_fpregs_struct));
DEFINE_LONGS(HOST_FPX_SIZE, sizeof(struct user_fpxregs_struct));
DEFINE(HOST_IP, EIP);
DEFINE(HOST_SP, UESP);
DEFINE(HOST_EFLAGS, EFL);
@ -41,11 +38,6 @@ void foo(void)
DEFINE(HOST_GS, GS);
DEFINE(HOST_ORIG_AX, ORIG_EAX);
#else
#ifdef FP_XSTATE_MAGIC1
DEFINE_LONGS(HOST_FP_SIZE, 2696);
#else
DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
#endif
DEFINE_LONGS(HOST_BX, RBX);
DEFINE_LONGS(HOST_CX, RCX);
DEFINE_LONGS(HOST_DI, RDI);

5
arch/x86/um/vdso/Makefile
View File

@ -56,7 +56,6 @@ CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
quiet_cmd_vdso = VDSO $@
cmd_vdso = $(CC) -nostdlib -o $@ \
$(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
sh $(src)/checkundef.sh '$(NM)' '$@'
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack -Wl,--no-undefined

11
arch/x86/um/vdso/checkundef.sh
View File

@ -1,11 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
nm="$1"
file="$2"
$nm "$file" | grep '^ *U' > /dev/null 2>&1
if [ $? -eq 1 ]; then
exit 0
else
echo "$file: undefined symbols found" >&2
exit 1
fi

5
fs/hostfs/hostfs_kern.c
View File

@ -57,6 +57,7 @@ static int __init hostfs_args(char *options, int *add)
{
char *ptr;
*add = 0;
ptr = strchr(options, ',');
if (ptr != NULL)
*ptr++ = '\0';
@ -471,8 +472,8 @@ static int hostfs_write_begin(struct file *file, struct address_space *mapping,
*foliop = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
mapping_gfp_mask(mapping));
if (!*foliop)
return -ENOMEM;
if (IS_ERR(*foliop))
return PTR_ERR(*foliop);
return 0;
}