Commit 3162f751 authored Sep 26, 2006 by Arjan van de Ven Committed by Andi Kleen Sep 26, 2006

[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>

parent 0a425405

kernel/panic.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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