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 <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
CC: Andi Kleen <[email protected]>
---
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
-
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