The patch titled
Subject: sh/boot: add static stack-protector to pre-kernel
has been added to the -mm tree. Its filename is
sh-boot-add-static-stack-protector-to-pre-kernel.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/sh-boot-add-static-stack-protector-to-pre-kernel.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/sh-boot-add-static-stack-protector-to-pre-kernel.patch
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------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: sh/boot: add static stack-protector to pre-kernel
The sh decompressor code triggers stack-protector code generation when
using CONFIG_CC_STACKPROTECTOR_STRONG. As done for arm and mips, add a
simple static stack-protector canary. As this wasn't protected before,
the risk of using a weak canary is minimized. Once the kernel is actually
up, a better canary is chosen.
Link: http://lkml.kernel.org/r/1506972007-80614-2-git-send-email-keescook@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sh/boot/compressed/misc.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff -puN arch/sh/boot/compressed/misc.c~sh-boot-add-static-stack-protector-to-pre-kernel arch/sh/boot/compressed/misc.c
--- a/arch/sh/boot/compressed/misc.c~sh-boot-add-static-stack-protector-to-pre-kernel
+++ a/arch/sh/boot/compressed/misc.c
@@ -103,6 +103,18 @@ static void error(char *x)
while(1); /* Halt */
}
+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");
+}
+
#ifdef CONFIG_SUPERH64
#define stackalign 8
#else
@@ -117,6 +129,8 @@ void decompress_kernel(void)
{
unsigned long output_addr;
+ __stack_chk_guard_setup();
+
#ifdef CONFIG_SUPERH64
output_addr = (CONFIG_MEMORY_START + 0x2000);
#else
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
sh-boot-add-static-stack-protector-to-pre-kernel.patch
makefile-move-stackprotector-availability-out-of-kconfig.patch
makefile-introduce-config_cc_stackprotector_auto.patch
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