Add the __stack_chk_fail() From: Arjan van de Ven 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 Signed-off-by: Ingo Molnar Signed-off-by: Andi Kleen CC: Andi Kleen --- kernel/panic.c | 12 ++++++++++++ 1 files changed, 12 insertions(+) Index: linux/kernel/panic.c =================================================================== --- linux.orig/kernel/panic.c +++ linux/kernel/panic.c @@ -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