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x86/mm/pti: Introduce pti_finalize()

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Introduce a new function to finalize the kernel mappings for the userspace
page-table after all ro/nx protections have been applied to the kernel
mappings.

Also move the call to pti_clone_kernel_text() to that function so that it
will run on 32 bit kernels too.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Pavel Machek <pavel@ucw.cz>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: linux-mm@kvack.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Waiman Long <llong@redhat.com>
Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca>
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1531906876-13451-30-git-send-email-joro@8bytes.org
This commit is contained in:
Joerg Roedel 2018-07-18 11:41:06 +02:00 committed by Thomas Gleixner
parent 1ac228a7c8
commit b976690f5d
5 changed files with 22 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/include/asm/pti.h
View File

@ -6,10 +6,9 @@
#ifdef CONFIG_PAGE_TABLE_ISOLATION
extern void pti_init(void);
extern void pti_check_boottime_disable(void);
extern void pti_clone_kernel_text(void);
extern void pti_finalize(void);
#else
static inline void pti_check_boottime_disable(void) { }
static inline void pti_clone_kernel_text(void) { }
#endif
#endif /* __ASSEMBLY__ */

6
arch/x86/mm/init_64.c
View File

@ -1291,12 +1291,6 @@ void mark_rodata_ro(void)
(unsigned long) __va(__pa_symbol(_sdata)));
debug_checkwx();
/*
* Do this after all of the manipulation of the
* kernel text page tables are complete.
*/
pti_clone_kernel_text();
}
int kern_addr_valid(unsigned long addr)

14
arch/x86/mm/pti.c
View File

@ -462,7 +462,7 @@ static inline bool pti_kernel_image_global_ok(void)
* For some configurations, map all of kernel text into the user page
* tables. This reduces TLB misses, especially on non-PCID systems.
*/
void pti_clone_kernel_text(void)
static void pti_clone_kernel_text(void)
{
/*
* rodata is part of the kernel image and is normally
@ -526,3 +526,15 @@ void __init pti_init(void)
pti_setup_espfix64();
pti_setup_vsyscall();
}
/*
* Finalize the kernel mappings in the userspace page-table.
*/
void pti_finalize(void)
{
/*
* Do this after all of the manipulation of the
* kernel text page tables are complete.
*/
pti_clone_kernel_text();
}

1
include/linux/pti.h
View File

@ -6,6 +6,7 @@
#include <asm/pti.h>
#else
static inline void pti_init(void) { }
static inline void pti_finalize(void) { }
#endif
#endif

7
init/main.c
View File

@ -1065,6 +1065,13 @@ static int __ref kernel_init(void *unused)
jump_label_invalidate_initmem();
free_initmem();
mark_readonly();
/*
* Kernel mappings are now finalized - update the userspace page-table
* to finalize PTI.
*/
pti_finalize();
system_state = SYSTEM_RUNNING;
numa_default_policy();