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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Huacai Chen <chenhc@xxxxxxxxxx>
Subject: zboot: fix stack protector in compressed boot phase
Calling __stack_chk_guard_setup() in decompress_kernel() is too late
because stack checking always fails for decompress_kernel() itself. So
remove __stack_chk_guard_setup() and initialize __stack_chk_guard at
compile time.
Original code comes from ARM but also used for MIPS and SH, so fix them
together. 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/1520230721-1839-1-git-send-email-chenhc@xxxxxxxxxx
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
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;
-}
+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;
-}
+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;
-}
+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
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