[Patch 5 of 8] Add the __stack_chk_fail() function

GCC emits a call to a __stack_chk_fail() function when the cookie is not 
matching the expected value. Since this is a bad security issue; lets panic
the kernel

Signed-off-by: Arjan van de Ven <[email protected]>

---
 kernel/panic.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux-2.6.16-rc6-stack-protector/kernel/panic.c
===================================================================
--- linux-2.6.16-rc6-stack-protector.orig/kernel/panic.c
+++ linux-2.6.16-rc6-stack-protector/kernel/panic.c
@@ -174,3 +174,11 @@ void add_taint(unsigned flag)
 	tainted |= flag;
 }
 EXPORT_SYMBOL(add_taint);
+
+#ifdef CONFIG_STACK_PROTECTOR
+void __stack_chk_fail(void)
+{
+	panic("stack-protector: Stack is corrupted\n");
+}
+EXPORT_SYMBOL(__stack_chk_fail);
+#endif

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---

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    • From: Arjan van de Ven <[email protected]>

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