panic: print more informative messages on stackprotect failure

pointed out by pageexec@freemail.hu:

we just simply panic() when there's a stackprotector attack - giving
the attacked person no information about what kernel code the attack went
against.

print out the attacked function.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/panic.c b/kernel/panic.c
index 425567f..f236001 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -327,7 +327,8 @@ EXPORT_SYMBOL(warn_on_slowpath);
  */
 void __stack_chk_fail(void)
 {
-       panic("stack-protector: Kernel stack is corrupted");
+       panic("stack-protector: Kernel stack is corrupted in: %p\n",
+               __builtin_return_address(0));
 }
 EXPORT_SYMBOL(__stack_chk_fail);
 #endif