From 870925205c78415dc4c594bfae9de8eb31745b81 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 30 Nov 2009 00:33:42 +0100
Subject: Add stack-protector support

	* kern/debug.c (__stack_chk_guard): New variable
	(__stack_chk_fail): New function.
---
 kern/debug.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'kern/debug.c')

diff --git a/kern/debug.c b/kern/debug.c
index 109d920..67b04ad 100644
--- a/kern/debug.c
+++ b/kern/debug.c
@@ -191,3 +191,16 @@ log(int level, const char *fmt, ...)
 	_doprnt(fmt, &listp, do_cnputc, 0, 0);
 	va_end(listp);
 }
+
+unsigned char __stack_chk_guard [ sizeof (vm_offset_t) ] =
+{
+	[ sizeof (vm_offset_t) - 3 ] = '\r',
+	[ sizeof (vm_offset_t) - 2 ] = '\n',
+	[ sizeof (vm_offset_t) - 1 ] = 0xff,
+};
+
+void
+__stack_chk_fail (void)
+{
+	panic("stack smashing detected");
+}
-- 
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