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Power management fix for v4.8-rc1

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Fix a nasty (and really hard to debug) memory corruption during
 resume from hibernation on x86-64 (that leads to a kernel panic
 most of the time) due to the use of a stale stack pointer value
 in FRAME_BEGIN (Josh Poimboeuf).
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Merge tag 'pm-urgent-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Fix a nasty (and really hard to debug) memory corruption during resume
  from hibernation on x86-64 (that leads to a kernel panic most of the
  time) due to the use of a stale stack pointer value in FRAME_BEGIN
  (Josh Poimboeuf)"

* tag 'pm-urgent-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  x86/power/64: Fix hibernation return address corruption
This commit is contained in:
Linus Torvalds 2016-07-29 14:34:55 -07:00
commit 601f887d61
1 changed files with 1 additions and 3 deletions
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4
arch/x86/power/hibernate_asm_64.S
View File

@ -24,7 +24,6 @@
#include <asm/frame.h>
ENTRY(swsusp_arch_suspend)
FRAME_BEGIN
movq $saved_context, %rax
movq %rsp, pt_regs_sp(%rax)
movq %rbp, pt_regs_bp(%rax)
@ -48,6 +47,7 @@ ENTRY(swsusp_arch_suspend)
movq %cr3, %rax
movq %rax, restore_cr3(%rip)
FRAME_BEGIN
call swsusp_save
FRAME_END
ret
@ -104,7 +104,6 @@ ENTRY(core_restore_code)
/* code below belongs to the image kernel */
.align PAGE_SIZE
ENTRY(restore_registers)
FRAME_BEGIN
/* go back to the original page tables */
movq %r9, %cr3
@ -145,6 +144,5 @@ ENTRY(restore_registers)
/* tell the hibernation core that we've just restored the memory */
movq %rax, in_suspend(%rip)
FRAME_END
ret
ENDPROC(restore_registers)