Michel Lespinasse 1869305009 mm: introduce VM_POPULATE flag to better deal with racy userspace programs ...

The vm_populate() code populates user mappings without constantly
holding the mmap_sem.  This makes it susceptible to racy userspace
programs: the user mappings may change while vm_populate() is running,
and in this case vm_populate() may end up populating the new mapping
instead of the old one.

In order to reduce the possibility of userspace getting surprised by
this behavior, this change introduces the VM_POPULATE vma flag which
gets set on vmas we want vm_populate() to work on.  This way
vm_populate() may still end up populating the new mapping after such a
race, but only if the new mapping is also one that the user has
requested (using MAP_SHARED, MAP_LOCKED or mlock) to be populated.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Andy Lutomirski <luto@amacapital.net>
Cc: Greg Ungerer <gregungerer@westnet.com.au>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2013-02-23 17:50:11 -08:00

..

backing-dev.c

bdi: allow block devices to say that they require stable page writes

2013-02-21 17:22:19 -08:00

balloon_compaction.c

mm: introduce a common interface for balloon pages mobility

2012-12-11 17:22:26 -08:00

bootmem.c

mm: Add alloc_bootmem_low_pages_nopanic()

2013-01-29 19:32:59 -08:00

bounce.c

block: optionally snapshot page contents to provide stable pages during write

2013-02-21 17:22:20 -08:00

cleancache.c

->encode_fh() API change

2012-05-29 23:28:33 -04:00

compaction.c

mm: compaction: make __compact_pgdat() and compact_pgdat() return void

2013-02-23 17:50:10 -08:00

debug-pagealloc.c

mm, x86: Remove debug_pagealloc_enabled

2011-12-06 09:24:07 +01:00

dmapool.c

dmapool: make DMAPOOL_DEBUG detect corruption of free marker

2012-12-11 17:22:24 -08:00

fadvise.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

failslab.c

switch debugfs to umode_t

2012-01-03 22:54:56 -05:00

filemap_xip.c

mm: move all mmu notifier invocations to be done outside the PT lock

2012-10-09 16:22:58 +09:00

filemap.c

mm: only enforce stable page writes if the backing device requires it

2013-02-21 17:22:19 -08:00

fremap.c

mm: introduce VM_POPULATE flag to better deal with racy userspace programs

2013-02-23 17:50:11 -08:00

frontswap.c

frontswap: support exclusive gets if tmem backend is capable

2012-09-21 10:38:12 -04:00

highmem.c

Some nice cleanups, and even a patch my wife did as a "live" demo for

2012-12-20 08:37:05 -08:00

huge_memory.c

mm/huge_memory.c: use new hashtable implementation

2013-02-23 17:50:10 -08:00

hugetlb_cgroup.c

mm/hugetlb: create hugetlb cgroup file in hugetlb_init

2012-12-18 15:02:15 -08:00

hugetlb.c

mm/hugetlb.c: convert to pr_foo()

2013-02-23 17:50:09 -08:00

hwpoison-inject.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

init-mm.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

internal.h

mm: directly use __mlock_vma_pages_range() in find_extend_vma()

2013-02-23 17:50:11 -08:00

interval_tree.c

mm: add CONFIG_DEBUG_VM_RB build option

2012-10-09 16:22:42 +09:00

Kconfig

Merge branch 'akpm' (incoming from Andrew)

2013-02-21 17:38:49 -08:00

Kconfig.debug

mm: more intensive memory corruption debugging

2012-01-10 16:30:42 -08:00

kmemcheck.c

kmemcheck: Fix build errors due to missing slab.h

2010-03-30 22:02:32 +09:00

kmemleak-test.c

kmemleak: remove memset by using kzalloc

2011-01-27 18:31:51 +00:00

kmemleak.c

mm/kmemleak.c: remove obsolete simple_strtoul

2012-12-18 15:02:15 -08:00

ksm.c

mm/ksm.c: use new hashtable implementation

2013-02-23 17:50:10 -08:00

maccess.c

mm: Map most files to use export.h instead of module.h

2011-10-31 09:20:12 -04:00

madvise.c

mm: make madvise(MADV_WILLNEED) support swap file prefetch

2013-02-23 17:50:10 -08:00

Makefile

mm: introduce a common interface for balloon pages mobility

2012-12-11 17:22:26 -08:00

memblock.c

memblock: Add memblock_mem_size()

2013-01-29 19:32:57 -08:00

memcontrol.c

mm/memcontrol.c: convert printk(KERN_FOO) to pr_foo()

2013-02-23 17:50:09 -08:00

memory_hotplug.c

mm/memory_hotplug.c: improve comments

2012-12-18 15:02:15 -08:00

memory-failure.c

Automatic NUMA Balancing V11

2012-12-16 15:18:08 -08:00

memory.c

mm: directly use __mlock_vma_pages_range() in find_extend_vma()

2013-02-23 17:50:11 -08:00

mempolicy.c

mm: mempolicy: Convert shared_policy mutex to spinlock

2013-01-02 17:32:13 -08:00

mempool.c

mempool: add @gfp_mask to mempool_create_node()

2012-06-25 11:53:47 +02:00

migrate.c

mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte

2013-02-05 20:38:47 +11:00

mincore.c

mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode

2012-03-21 17:54:54 -07:00

mlock.c

mm: introduce VM_POPULATE flag to better deal with racy userspace programs

2013-02-23 17:50:11 -08:00

mm_init.c

mm: Map most files to use export.h instead of module.h

2011-10-31 09:20:12 -04:00

mmap.c

mm: introduce VM_POPULATE flag to better deal with racy userspace programs

2013-02-23 17:50:11 -08:00

mmu_context.c

mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()

2012-03-21 17:54:59 -07:00

mmu_notifier.c

mm/mmu_notifier: allocate mmu_notifier in advance

2012-10-25 14:37:53 -07:00

mmzone.c

memcg: fix hotplugged memory zone oops

2012-11-16 14:33:04 -08:00

mprotect.c

mm/mprotect.c: coding-style cleanups

2012-12-18 15:02:15 -08:00

mremap.c

mm: use mm_populate() for mremap() of VM_LOCKED vmas

2013-02-23 17:50:11 -08:00

msync.c

sanitize vfs_fsync calling conventions

2010-05-21 18:31:21 -04:00

nobootmem.c

mm: Add alloc_bootmem_low_pages_nopanic()

2013-01-29 19:32:59 -08:00

nommu.c

mm: introduce mm_populate() for populating new vmas

2013-02-23 17:50:10 -08:00

oom_kill.c

memcg, oom: provide more precise dump info while memcg oom happening

2013-02-23 17:50:08 -08:00

page_alloc.c

mm/page_alloc.c:__setup_per_zone_wmarks: make min_pages unsigned long

2013-02-23 17:50:10 -08:00

page_cgroup.c

memcontrol: use N_MEMORY instead N_HIGH_MEMORY

2012-12-12 17:38:32 -08:00

page_io.c

mm: add support for direct_IO to highmem pages

2012-07-31 18:42:47 -07:00

page_isolation.c

mm: fix zone_watermark_ok_safe() accounting of isolated pages

2013-01-04 16:11:46 -08:00

page-writeback.c

block: optionally snapshot page contents to provide stable pages during write

2013-02-21 17:22:20 -08:00

pagewalk.c

thp: change split_huge_page_pmd() interface

2012-12-12 17:38:31 -08:00

percpu-km.c

percpu: clear memory allocated with the km allocator

2010-10-02 10:28:42 +03:00

percpu-vm.c

mm: fix kernel-doc warnings

2012-06-20 14:39:36 -07:00

percpu.c

mm, percpu: Make sure percpu_alloc early parameter has an argument

2012-12-02 06:23:04 -08:00

pgtable-generic.c

mm: Only flush the TLB when clearing an accessible pte

2012-12-11 14:28:34 +00:00

process_vm_access.c

aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector()

2012-05-31 17:49:32 -07:00

quicklist.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

readahead.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

rmap.c

s390/mm: implement software dirty bits

2013-02-14 15:55:23 +01:00

shmem.c

mempolicy: remove arg from mpol_parse_str, mpol_to_str

2013-01-02 09:27:10 -08:00

slab_common.c

slab: propagate tunable values

2012-12-18 15:02:14 -08:00

slab.c

memcg: add comments clarifying aspects of cache attribute propagation

2012-12-18 15:02:15 -08:00

slab.h

slab: propagate tunable values

2012-12-18 15:02:14 -08:00

slob.c

sl[au]b: always get the cache from its page in kmem_cache_free()

2012-12-18 15:02:14 -08:00

slub.c

slub: drop mutex before deleting sysfs entry

2012-12-18 15:02:15 -08:00

sparse-vmemmap.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

sparse.c

memory-hotplug, mm/sparse.c: clear the memory to store struct page

2012-12-11 17:22:23 -08:00

swap_state.c

mm: add support for a filesystem to activate swap files and use direct_IO for writing swap pages

2012-07-31 18:42:47 -07:00

swap.c

mm: remove vma arg from page_evictable

2012-10-09 16:22:55 +09:00

swapfile.c

mm, oom: fix race when specifying a thread as the oom origin

2012-12-11 17:22:27 -08:00

truncate.c

mm: drop vmtruncate

2012-12-20 18:46:29 -05:00

util.c

mm: introduce mm_populate() for populating new vmas

2013-02-23 17:50:10 -08:00

vmalloc.c

mm: use IS_ENABLED(CONFIG_NUMA) instead of NUMA_BUILD

2012-12-11 17:22:22 -08:00

vmscan.c

mm: avoid calling pgdat_balanced() needlessly

2013-02-23 17:50:10 -08:00

vmstat.c

Automatic NUMA Balancing V11

2012-12-16 15:18:08 -08:00