Messages in this thread Patch in this message | | | Subject | [patch 4/5] -fstack-protector feature: Add the __stack_chk_fail() function | From | Arjan van de Ven <> | Date | Wed, 16 Aug 2006 18:52:23 +0200 |
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Subject: [patch 4/5] 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> CC: Andi Kleen <ak@suse.de>
--- kernel/panic.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
Index: linux-2.6.18-rc4-stackprot/kernel/panic.c =================================================================== --- linux-2.6.18-rc4-stackprot.orig/kernel/panic.c +++ linux-2.6.18-rc4-stackprot/kernel/panic.c @@ -269,3 +269,15 @@ 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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