linux-kernel - [PATCH] MIPS: ZBOOT: implement stack protector in compressed boot phase

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Date:	Tue, 24 Jun 2014 16:00:17 -0700
From:	Ben Chan <benchan@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Cc:	Kees Cook <keescook@...omium.org>,
	Olof Johansson <olofj@...omium.org>
Subject: [PATCH] MIPS: ZBOOT: implement stack protector in compressed boot phase

This patch implements the stack protector code in MIPS compressed boot
phase based on the same code added to arm in commit
8779657d29c0ebcc0c94ede4df2f497baf1b563f "stackprotector: Introduce
CONFIG_CC_STACKPROTECTOR_STRONG" by Kees Cook <keescook@...omium.org>

Signed-off-by: Ben Chan <benchan@...omium.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Olof Johansson <olofj@...omium.org>
---
 arch/mips/boot/compressed/decompress.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
index c00c4dd..b49c7ad 100644
--- a/arch/mips/boot/compressed/decompress.c
+++ b/arch/mips/boot/compressed/decompress.c
@@ -67,10 +67,24 @@ void error(char *x)
 #include "../../../../lib/decompress_unxz.c"
 #endif
 
+unsigned long __stack_chk_guard;
+
+void __stack_chk_guard_setup(void)
+{
+	__stack_chk_guard = 0x000a0dff;
+}
+
+void __stack_chk_fail(void)
+{
+	error("stack-protector: Kernel stack is corrupted\n");
+}
+
 void decompress_kernel(unsigned long boot_heap_start)
 {
 	unsigned long zimage_start, zimage_size;
 
+	__stack_chk_guard_setup();
+
 	zimage_start = (unsigned long)(&__image_begin);
 	zimage_size = (unsigned long)(&__image_end) -
 	    (unsigned long)(&__image_begin);
-- 
2.0.0.526.g5318336

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