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authorHuacai Chen <chenhc@lemote.com>2018-04-06 02:18:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-06 07:36:21 +0300
commit7bbaf27d9c83037b6e60a818e57bdbedf6bc15be (patch)
tree2a57a429945a5e545daf9d95208f341dc3512f74 /arch/sh
parent06dd3dfeea60e2a6457a6aedf97afc8e6d2ba497 (diff)
downloadlinux-7bbaf27d9c83037b6e60a818e57bdbedf6bc15be.tar.xz
zboot: fix stack protector in compressed boot phase
Calling __stack_chk_guard_setup() in decompress_kernel() is too late that stack checking always fails for decompress_kernel() itself. So remove __stack_chk_guard_setup() and initialize __stack_chk_guard before we call decompress_kernel(). Original code comes from ARM but also used for MIPS and SH, so fix them together. If without this fix, compressed booting of these archs will fail because stack checking is enabled by default (>=4.16). Link: http://lkml.kernel.org/r/1522226933-29317-1-git-send-email-chenhc@lemote.com Fixes: 8779657d29c0 ("stackprotector: Introduce CONFIG_CC_STACKPROTECTOR_STRONG") Signed-off-by: Huacai Chen <chenhc@lemote.com> Acked-by: James Hogan <jhogan@kernel.org> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Rich Felker <dalias@libc.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Ingo Molnar <mingo@elte.hu> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/boot/compressed/misc.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
index 627ce8e75e01..c15cac9251b9 100644
--- a/arch/sh/boot/compressed/misc.c
+++ b/arch/sh/boot/compressed/misc.c
@@ -104,12 +104,7 @@ static void error(char *x)
while(1); /* Halt */
}
-unsigned long __stack_chk_guard;
-
-void __stack_chk_guard_setup(void)
-{
- __stack_chk_guard = 0x000a0dff;
-}
+const unsigned long __stack_chk_guard = 0x000a0dff;
void __stack_chk_fail(void)
{
@@ -130,8 +125,6 @@ void decompress_kernel(void)
{
unsigned long output_addr;
- __stack_chk_guard_setup();
-
#ifdef CONFIG_SUPERH64
output_addr = (CONFIG_MEMORY_START + 0x2000);
#else