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prevent kprobes from catching spurious page faults

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Prevent kprobes from catching spurious faults which will cause infinite
recursive page-fault and memory corruption by stack overflow.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: <stable@kernel.org>		[2.6.28.x]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masami Hiramatsu 2009-02-05 17:12:39 -05:00 committed by Linus Torvalds
parent 767b5828ad
commit 9be260a646
1 changed files with 6 additions and 2 deletions
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8
arch/x86/mm/fault.c
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@ -603,8 +603,6 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
si_code = SEGV_MAPERR;
if (notify_page_fault(regs))
return;
if (unlikely(kmmio_fault(regs, address)))
return;
@ -634,6 +632,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
if (spurious_fault(address, error_code))
return;
/* kprobes don't want to hook the spurious faults. */
if (notify_page_fault(regs))
return;
/*
* Don't take the mm semaphore here. If we fixup a prefetch
* fault we could otherwise deadlock.
@ -641,6 +642,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
goto bad_area_nosemaphore;
}
/* kprobes don't want to hook the spurious faults. */
if (notify_page_fault(regs))
return;
/*
* It's safe to allow irq's after cr2 has been saved and the