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authorArjan van de Ven <arjan@linux.intel.com>2006-09-26 10:52:39 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 10:52:39 +0200
commit3162f751d04086a9d006342de63ac8f44fe0f72a (patch)
treebe702f29e5604621898e394ef387c2617334bb65 /kernel/panic.c
parent0a4254058037eb172758961d0a5b94f4320a1425 (diff)
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[PATCH] 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> Signed-off-by: Andi Kleen <ak@suse.de> CC: Andi Kleen <ak@suse.de>
Diffstat (limited to 'kernel/panic.c')
-rw-r--r--kernel/panic.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c
index d2db3e2209e..6ceb664fb52 100644
--- a/kernel/panic.c
+++ b/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