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authorBen Chan <benchan@chromium.org>2014-06-25 01:00:17 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-08-02 00:06:46 +0200
commit3b628cac65fa57fe7d948b9b24b9731cab7dd44f (patch)
treeaada423e07f4484b7b4848996a802ed4eccb89f4
parentMIPS: mipsreg: remove duplicate MIPS_CONF4_FTLBSETS_SHIFT (diff)
downloadlinux-3b628cac65fa57fe7d948b9b24b9731cab7dd44f.tar.xz
linux-3b628cac65fa57fe7d948b9b24b9731cab7dd44f.zip
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@chromium.org> Signed-off-by: Ben Chan <benchan@chromium.org> Cc: Kees Cook <keescook@chromium.org> Cc: Olof Johansson <olofj@chromium.org> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7175/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/boot/compressed/decompress.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
index c00c4ddf4514..b49c7adbfa89 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);