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[PATCH] Add the __stack_chk_fail() function 

GCC emits a call to a __stack_chk_fail() function when the stack canary is
not matching the expected value.

Since this is a bad security issue; lets panic the kernel rather than limping
along; the kernel really can't be trusted anymore when this happens.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andi Kleen <ak@suse.de>
CC: Andi Kleen <ak@suse.de>
This commit is contained in:
Arjan van de Ven 2006-09-26 10:52:39 +02:00 committed by Andi Kleen
parent 0a42540580
commit 3162f751d0
1 changed files with 12 additions and 0 deletions
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12
kernel/panic.c
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@ -271,3 +271,15 @@ void oops_exit(void)
{
do_oops_enter_exit();
}
#ifdef CONFIG_CC_STACKPROTECTOR
/*
* Called when gcc's -fstack-protector feature is used, and
* gcc detects corruption of the on-stack canary value
*/
void __stack_chk_fail(void)
{
panic("stack-protector: Kernel stack is corrupted");
}
EXPORT_SYMBOL(__stack_chk_fail);
#endif