The patch titled
Subject: zboot: fix stack protector in compressed boot phase
has been added to the -mm tree. Its filename is
zboot-fix-stack-protector-in-compressed-boot-phase.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zboot-fix-stack-protector-in-compressed-boot-phase.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zboot-fix-stack-protector-in-compressed-boot-phase.patch
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------------------------------------------------------
From: Huacai Chen <chenhc@xxxxxxxxxx>
Subject: zboot: fix stack protector in compressed boot phase
Call __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@xxxxxxxxxx
Fixes: 8779657d29c0 ("stackprotector: Introduce CONFIG_CC_STACKPROTECTOR_STRONG")
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Acked-by: James Hogan <jhogan@xxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Rich Felker <dalias@xxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/compressed/misc.c | 9 +--------
arch/mips/boot/compressed/decompress.c | 9 +--------
arch/sh/boot/compressed/misc.c | 9 +--------
3 files changed, 3 insertions(+), 24 deletions(-)
diff -puN arch/arm/boot/compressed/misc.c~zboot-fix-stack-protector-in-compressed-boot-phase arch/arm/boot/compressed/misc.c
--- a/arch/arm/boot/compressed/misc.c~zboot-fix-stack-protector-in-compressed-boot-phase
+++ a/arch/arm/boot/compressed/misc.c
@@ -128,12 +128,7 @@ asmlinkage void __div0(void)
error("Attempting division by 0!");
}
-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)
{
@@ -150,8 +145,6 @@ decompress_kernel(unsigned long output_s
{
int ret;
- __stack_chk_guard_setup();
-
output_data = (unsigned char *)output_start;
free_mem_ptr = free_mem_ptr_p;
free_mem_end_ptr = free_mem_ptr_end_p;
diff -puN arch/mips/boot/compressed/decompress.c~zboot-fix-stack-protector-in-compressed-boot-phase arch/mips/boot/compressed/decompress.c
--- a/arch/mips/boot/compressed/decompress.c~zboot-fix-stack-protector-in-compressed-boot-phase
+++ a/arch/mips/boot/compressed/decompress.c
@@ -76,12 +76,7 @@ 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;
-}
+const unsigned long __stack_chk_guard = 0x000a0dff;
void __stack_chk_fail(void)
{
@@ -92,8 +87,6 @@ void decompress_kernel(unsigned long boo
{
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);
diff -puN arch/sh/boot/compressed/misc.c~zboot-fix-stack-protector-in-compressed-boot-phase arch/sh/boot/compressed/misc.c
--- a/arch/sh/boot/compressed/misc.c~zboot-fix-stack-protector-in-compressed-boot-phase
+++ a/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
_
Patches currently in -mm which might be from chenhc@xxxxxxxxxx are
zboot-fix-stack-protector-in-compressed-boot-phase.patch