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).
V2: Fix build on ARM.
Cc: [email protected]
Signed-off-by: Huacai Chen <[email protected]>
---
arch/arm/boot/compressed/head.S | 4 ++++
arch/arm/boot/compressed/misc.c | 7 -------
arch/mips/boot/compressed/decompress.c | 7 -------
arch/mips/boot/compressed/head.S | 4 ++++
arch/sh/boot/compressed/head_32.S | 4 ++++
arch/sh/boot/compressed/head_64.S | 4 ++++
arch/sh/boot/compressed/misc.c | 7 -------
7 files changed, 16 insertions(+), 21 deletions(-)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 45c8823..bae1fc6 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -547,6 +547,10 @@ not_relocated: mov r0, #0
bic r4, r4, #1
blne cache_on
+ ldr r0, =__stack_chk_guard
+ ldr r1, =0x000a0dff
+ str r1, [r0]
+
/*
* The C runtime environment should now be setup sufficiently.
* Set up some pointers, and start decompressing.
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index 16a8a80..e518ef5 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -130,11 +130,6 @@ asmlinkage void __div0(void)
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");
@@ -150,8 +145,6 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
{
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 --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
index fdf99e9..5ba431c 100644
--- a/arch/mips/boot/compressed/decompress.c
+++ b/arch/mips/boot/compressed/decompress.c
@@ -78,11 +78,6 @@ void error(char *x)
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");
@@ -92,8 +87,6 @@ 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);
diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
index 409cb48..00d0ee0 100644
--- a/arch/mips/boot/compressed/head.S
+++ b/arch/mips/boot/compressed/head.S
@@ -32,6 +32,10 @@ start:
bne a2, a0, 1b
addiu a0, a0, 4
+ PTR_LA a0, __stack_chk_guard
+ PTR_LI a1, 0x000a0dff
+ sw a1, 0(a0)
+
PTR_LA a0, (.heap) /* heap address */
PTR_LA sp, (.stack + 8192) /* stack address */
diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
index 7bb1681..a3fdb05 100644
--- a/arch/sh/boot/compressed/head_32.S
+++ b/arch/sh/boot/compressed/head_32.S
@@ -76,6 +76,10 @@ l1:
mov.l init_stack_addr, r0
mov.l @r0, r15
+ mov.l __stack_chk_guard, r0
+ mov #0x000a0dff, r1
+ mov.l r1, @r0
+
/* Decompress the kernel */
mov.l decompress_kernel_addr, r0
jsr @r0
diff --git a/arch/sh/boot/compressed/head_64.S b/arch/sh/boot/compressed/head_64.S
index 9993113..8b4d540 100644
--- a/arch/sh/boot/compressed/head_64.S
+++ b/arch/sh/boot/compressed/head_64.S
@@ -132,6 +132,10 @@ startup:
addi r22, 4, r22
bne r22, r23, tr1
+ movi datalabel __stack_chk_guard, r0
+ movi 0x000a0dff, r1
+ st.l r0, 0, r1
+
/*
* Decompress the kernel.
*/
diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
index 627ce8e..fe4c079 100644
--- a/arch/sh/boot/compressed/misc.c
+++ b/arch/sh/boot/compressed/misc.c
@@ -106,11 +106,6 @@ static void error(char *x)
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");
@@ -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
--
2.7.0
Hi Huacai,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc5 next-20180309]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Huacai-Chen/ZBOOT-fix-stack-protector-in-compressed-boot-phase/20180312-114651
config: sh-allnoconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=sh
All errors (new ones prefixed by >>):
arch/sh/boot/compressed/head_32.S: Assembler messages:
>> arch/sh/boot/compressed/head_32.S:79: Error: pcrel too far
>> arch/sh/boot/compressed/head_32.S:80: Error: offset out of range
>> arch/sh/boot/compressed/head_32.S:80: Error: value of 658943 too large for field of 2 bytes at 102
vim +79 arch/sh/boot/compressed/head_32.S
12
13 .global startup
14 startup:
15 /* Load initial status register */
16 mov.l init_sr, r1
17 ldc r1, sr
18
19 /* Move myself to proper location if necessary */
20 mova 1f, r0
21 mov.l 1f, r2
22 cmp/eq r2, r0
23 bt clear_bss
24 sub r0, r2
25 mov.l bss_start_addr, r0
26 mov #0xffffffe0, r1
27 and r1, r0 ! align cache line
28 mov.l text_start_addr, r3
29 mov r0, r1
30 sub r2, r1
31 3:
32 mov.l @r1, r4
33 mov.l @(4,r1), r5
34 mov.l @(8,r1), r6
35 mov.l @(12,r1), r7
36 mov.l @(16,r1), r8
37 mov.l @(20,r1), r9
38 mov.l @(24,r1), r10
39 mov.l @(28,r1), r11
40 mov.l r4, @r0
41 mov.l r5, @(4,r0)
42 mov.l r6, @(8,r0)
43 mov.l r7, @(12,r0)
44 mov.l r8, @(16,r0)
45 mov.l r9, @(20,r0)
46 mov.l r10, @(24,r0)
47 mov.l r11, @(28,r0)
48 #ifdef CONFIG_CPU_SH4
49 ocbwb @r0
50 #endif
51 cmp/hi r3, r0
52 add #-32, r0
53 bt/s 3b
54 add #-32, r1
55 mov.l 2f, r0
56 jmp @r0
57 nop
58
59 .align 2
60 1: .long 1b
61 2: .long clear_bss
62 text_start_addr:
63 .long startup
64
65 /* Clear BSS */
66 clear_bss:
67 mov.l end_addr, r1
68 mov.l bss_start_addr, r2
69 mov #0, r0
70 l1:
71 mov.l r0, @-r1
72 cmp/eq r1,r2
73 bf l1
74
75 /* Set the initial pointer. */
76 mov.l init_stack_addr, r0
77 mov.l @r0, r15
78
> 79 mov.l __stack_chk_guard, r0
> 80 mov #0x000a0dff, r1
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi, Yoshinori, Rich and SuperH developers,
I'm not familiar with SuperH assembly, but SuperH has the same bug
obviously. Could you please fix that?
Huacai
On Mon, Mar 12, 2018 at 10:04 AM, Huacai Chen <[email protected]> wrote:
> 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).
>
> V2: Fix build on ARM.
>
> Cc: [email protected]
> Signed-off-by: Huacai Chen <[email protected]>
> ---
> arch/arm/boot/compressed/head.S | 4 ++++
> arch/arm/boot/compressed/misc.c | 7 -------
> arch/mips/boot/compressed/decompress.c | 7 -------
> arch/mips/boot/compressed/head.S | 4 ++++
> arch/sh/boot/compressed/head_32.S | 4 ++++
> arch/sh/boot/compressed/head_64.S | 4 ++++
> arch/sh/boot/compressed/misc.c | 7 -------
> 7 files changed, 16 insertions(+), 21 deletions(-)
>
> diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
> index 45c8823..bae1fc6 100644
> --- a/arch/arm/boot/compressed/head.S
> +++ b/arch/arm/boot/compressed/head.S
> @@ -547,6 +547,10 @@ not_relocated: mov r0, #0
> bic r4, r4, #1
> blne cache_on
>
> + ldr r0, =__stack_chk_guard
> + ldr r1, =0x000a0dff
> + str r1, [r0]
> +
> /*
> * The C runtime environment should now be setup sufficiently.
> * Set up some pointers, and start decompressing.
> diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
> index 16a8a80..e518ef5 100644
> --- a/arch/arm/boot/compressed/misc.c
> +++ b/arch/arm/boot/compressed/misc.c
> @@ -130,11 +130,6 @@ asmlinkage void __div0(void)
>
> 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");
> @@ -150,8 +145,6 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
> {
> 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 --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
> index fdf99e9..5ba431c 100644
> --- a/arch/mips/boot/compressed/decompress.c
> +++ b/arch/mips/boot/compressed/decompress.c
> @@ -78,11 +78,6 @@ void error(char *x)
>
> 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");
> @@ -92,8 +87,6 @@ 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);
> diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
> index 409cb48..00d0ee0 100644
> --- a/arch/mips/boot/compressed/head.S
> +++ b/arch/mips/boot/compressed/head.S
> @@ -32,6 +32,10 @@ start:
> bne a2, a0, 1b
> addiu a0, a0, 4
>
> + PTR_LA a0, __stack_chk_guard
> + PTR_LI a1, 0x000a0dff
> + sw a1, 0(a0)
> +
> PTR_LA a0, (.heap) /* heap address */
> PTR_LA sp, (.stack + 8192) /* stack address */
>
> diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
> index 7bb1681..a3fdb05 100644
> --- a/arch/sh/boot/compressed/head_32.S
> +++ b/arch/sh/boot/compressed/head_32.S
> @@ -76,6 +76,10 @@ l1:
> mov.l init_stack_addr, r0
> mov.l @r0, r15
>
> + mov.l __stack_chk_guard, r0
> + mov #0x000a0dff, r1
> + mov.l r1, @r0
> +
> /* Decompress the kernel */
> mov.l decompress_kernel_addr, r0
> jsr @r0
> diff --git a/arch/sh/boot/compressed/head_64.S b/arch/sh/boot/compressed/head_64.S
> index 9993113..8b4d540 100644
> --- a/arch/sh/boot/compressed/head_64.S
> +++ b/arch/sh/boot/compressed/head_64.S
> @@ -132,6 +132,10 @@ startup:
> addi r22, 4, r22
> bne r22, r23, tr1
>
> + movi datalabel __stack_chk_guard, r0
> + movi 0x000a0dff, r1
> + st.l r0, 0, r1
> +
> /*
> * Decompress the kernel.
> */
> diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
> index 627ce8e..fe4c079 100644
> --- a/arch/sh/boot/compressed/misc.c
> +++ b/arch/sh/boot/compressed/misc.c
> @@ -106,11 +106,6 @@ static void error(char *x)
>
> 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");
> @@ -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
> --
> 2.7.0
>
On Tue, 13 Mar 2018 17:55:53 +0900,
Huacai Chen wrote:
>
> Hi, Yoshinori, Rich and SuperH developers,
>
> I'm not familiar with SuperH assembly, but SuperH has the same bug
> obviously. Could you please fix that?
>
> Huacai
>
OK. Apply this fix.
SuperH can not handle long int directly.
diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
index a3fdb053f351..7411fcb5764a 100644
--- a/arch/sh/boot/compressed/head_32.S
+++ b/arch/sh/boot/compressed/head_32.S
@@ -76,8 +76,8 @@ l1:
mov.l init_stack_addr, r0
mov.l @r0, r15
- mov.l __stack_chk_guard, r0
- mov #0x000a0dff, r1
+ mov.l __stack_chk_guard_ptr, r0
+ mov.l __stack_chk_val, r1
mov.l r1, @r0
/* Decompress the kernel */
@@ -109,6 +109,10 @@ kernel_start_addr:
#else
.long _text+PAGE_SIZE
#endif
+__stack_chk_guard_ptr:
+ .long __stack_chk_guard
+__stack_chk_val:
+ .long 0x000a0dff
.align 9
fake_headers_as_bzImage:
> On Mon, Mar 12, 2018 at 10:04 AM, Huacai Chen <[email protected]> wrote:
> > 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).
> >
> > V2: Fix build on ARM.
> >
> > Cc: [email protected]
> > Signed-off-by: Huacai Chen <[email protected]>
> > ---
> > arch/arm/boot/compressed/head.S | 4 ++++
> > arch/arm/boot/compressed/misc.c | 7 -------
> > arch/mips/boot/compressed/decompress.c | 7 -------
> > arch/mips/boot/compressed/head.S | 4 ++++
> > arch/sh/boot/compressed/head_32.S | 4 ++++
> > arch/sh/boot/compressed/head_64.S | 4 ++++
> > arch/sh/boot/compressed/misc.c | 7 -------
> > 7 files changed, 16 insertions(+), 21 deletions(-)
> >
> > diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
> > index 45c8823..bae1fc6 100644
> > --- a/arch/arm/boot/compressed/head.S
> > +++ b/arch/arm/boot/compressed/head.S
> > @@ -547,6 +547,10 @@ not_relocated: mov r0, #0
> > bic r4, r4, #1
> > blne cache_on
> >
> > + ldr r0, =__stack_chk_guard
> > + ldr r1, =0x000a0dff
> > + str r1, [r0]
> > +
> > /*
> > * The C runtime environment should now be setup sufficiently.
> > * Set up some pointers, and start decompressing.
> > diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
> > index 16a8a80..e518ef5 100644
> > --- a/arch/arm/boot/compressed/misc.c
> > +++ b/arch/arm/boot/compressed/misc.c
> > @@ -130,11 +130,6 @@ asmlinkage void __div0(void)
> >
> > 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");
> > @@ -150,8 +145,6 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
> > {
> > 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 --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
> > index fdf99e9..5ba431c 100644
> > --- a/arch/mips/boot/compressed/decompress.c
> > +++ b/arch/mips/boot/compressed/decompress.c
> > @@ -78,11 +78,6 @@ void error(char *x)
> >
> > 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");
> > @@ -92,8 +87,6 @@ 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);
> > diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
> > index 409cb48..00d0ee0 100644
> > --- a/arch/mips/boot/compressed/head.S
> > +++ b/arch/mips/boot/compressed/head.S
> > @@ -32,6 +32,10 @@ start:
> > bne a2, a0, 1b
> > addiu a0, a0, 4
> >
> > + PTR_LA a0, __stack_chk_guard
> > + PTR_LI a1, 0x000a0dff
> > + sw a1, 0(a0)
> > +
> > PTR_LA a0, (.heap) /* heap address */
> > PTR_LA sp, (.stack + 8192) /* stack address */
> >
> > diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
> > index 7bb1681..a3fdb05 100644
> > --- a/arch/sh/boot/compressed/head_32.S
> > +++ b/arch/sh/boot/compressed/head_32.S
> > @@ -76,6 +76,10 @@ l1:
> > mov.l init_stack_addr, r0
> > mov.l @r0, r15
> >
> > + mov.l __stack_chk_guard, r0
> > + mov #0x000a0dff, r1
> > + mov.l r1, @r0
> > +
> > /* Decompress the kernel */
> > mov.l decompress_kernel_addr, r0
> > jsr @r0
> > diff --git a/arch/sh/boot/compressed/head_64.S b/arch/sh/boot/compressed/head_64.S
> > index 9993113..8b4d540 100644
> > --- a/arch/sh/boot/compressed/head_64.S
> > +++ b/arch/sh/boot/compressed/head_64.S
> > @@ -132,6 +132,10 @@ startup:
> > addi r22, 4, r22
> > bne r22, r23, tr1
> >
> > + movi datalabel __stack_chk_guard, r0
> > + movi 0x000a0dff, r1
> > + st.l r0, 0, r1
> > +
> > /*
> > * Decompress the kernel.
> > */
> > diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
> > index 627ce8e..fe4c079 100644
> > --- a/arch/sh/boot/compressed/misc.c
> > +++ b/arch/sh/boot/compressed/misc.c
> > @@ -106,11 +106,6 @@ static void error(char *x)
> >
> > 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");
> > @@ -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
> > --
> > 2.7.0
> >
--
Yoshinori Sato
<[email protected]>
On Tue, 13 Mar 2018 17:55:53 +0900,
Huacai Chen wrote:
>
> Hi, Yoshinori, Rich and SuperH developers,
>
> I'm not familiar with SuperH assembly, but SuperH has the same bug
> obviously. Could you please fix that?
>
> Huacai
>
Sorry. Previous mail bounced. It resend.
OK. Apply this fix.
SuperH can not handle long int directly.
diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
index a3fdb053f351..7411fcb5764a 100644
--- a/arch/sh/boot/compressed/head_32.S
+++ b/arch/sh/boot/compressed/head_32.S
@@ -76,8 +76,8 @@ l1:
mov.l init_stack_addr, r0
mov.l @r0, r15
- mov.l __stack_chk_guard, r0
- mov #0x000a0dff, r1
+ mov.l __stack_chk_guard_ptr, r0
+ mov.l __stack_chk_val, r1
mov.l r1, @r0
/* Decompress the kernel */
@@ -109,6 +109,10 @@ kernel_start_addr:
#else
.long _text+PAGE_SIZE
#endif
+__stack_chk_guard_ptr:
+ .long __stack_chk_guard
+__stack_chk_val:
+ .long 0x000a0dff
.align 9
fake_headers_as_bzImage:
> On Mon, Mar 12, 2018 at 10:04 AM, Huacai Chen <[email protected]> wrote:
> > 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).
> >
> > V2: Fix build on ARM.
> >
> > Cc: [email protected]
> > Signed-off-by: Huacai Chen <[email protected]>
> > ---
> > arch/arm/boot/compressed/head.S | 4 ++++
> > arch/arm/boot/compressed/misc.c | 7 -------
> > arch/mips/boot/compressed/decompress.c | 7 -------
> > arch/mips/boot/compressed/head.S | 4 ++++
> > arch/sh/boot/compressed/head_32.S | 4 ++++
> > arch/sh/boot/compressed/head_64.S | 4 ++++
> > arch/sh/boot/compressed/misc.c | 7 -------
> > 7 files changed, 16 insertions(+), 21 deletions(-)
> >
> > diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
> > index 45c8823..bae1fc6 100644
> > --- a/arch/arm/boot/compressed/head.S
> > +++ b/arch/arm/boot/compressed/head.S
> > @@ -547,6 +547,10 @@ not_relocated: mov r0, #0
> > bic r4, r4, #1
> > blne cache_on
> >
> > + ldr r0, =__stack_chk_guard
> > + ldr r1, =0x000a0dff
> > + str r1, [r0]
> > +
> > /*
> > * The C runtime environment should now be setup sufficiently.
> > * Set up some pointers, and start decompressing.
> > diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
> > index 16a8a80..e518ef5 100644
> > --- a/arch/arm/boot/compressed/misc.c
> > +++ b/arch/arm/boot/compressed/misc.c
> > @@ -130,11 +130,6 @@ asmlinkage void __div0(void)
> >
> > 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");
> > @@ -150,8 +145,6 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
> > {
> > 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 --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
> > index fdf99e9..5ba431c 100644
> > --- a/arch/mips/boot/compressed/decompress.c
> > +++ b/arch/mips/boot/compressed/decompress.c
> > @@ -78,11 +78,6 @@ void error(char *x)
> >
> > 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");
> > @@ -92,8 +87,6 @@ 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);
> > diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
> > index 409cb48..00d0ee0 100644
> > --- a/arch/mips/boot/compressed/head.S
> > +++ b/arch/mips/boot/compressed/head.S
> > @@ -32,6 +32,10 @@ start:
> > bne a2, a0, 1b
> > addiu a0, a0, 4
> >
> > + PTR_LA a0, __stack_chk_guard
> > + PTR_LI a1, 0x000a0dff
> > + sw a1, 0(a0)
> > +
> > PTR_LA a0, (.heap) /* heap address */
> > PTR_LA sp, (.stack + 8192) /* stack address */
> >
> > diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
> > index 7bb1681..a3fdb05 100644
> > --- a/arch/sh/boot/compressed/head_32.S
> > +++ b/arch/sh/boot/compressed/head_32.S
> > @@ -76,6 +76,10 @@ l1:
> > mov.l init_stack_addr, r0
> > mov.l @r0, r15
> >
> > + mov.l __stack_chk_guard, r0
> > + mov #0x000a0dff, r1
> > + mov.l r1, @r0
> > +
> > /* Decompress the kernel */
> > mov.l decompress_kernel_addr, r0
> > jsr @r0
> > diff --git a/arch/sh/boot/compressed/head_64.S b/arch/sh/boot/compressed/head_64.S
> > index 9993113..8b4d540 100644
> > --- a/arch/sh/boot/compressed/head_64.S
> > +++ b/arch/sh/boot/compressed/head_64.S
> > @@ -132,6 +132,10 @@ startup:
> > addi r22, 4, r22
> > bne r22, r23, tr1
> >
> > + movi datalabel __stack_chk_guard, r0
> > + movi 0x000a0dff, r1
> > + st.l r0, 0, r1
> > +
> > /*
> > * Decompress the kernel.
> > */
> > diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
> > index 627ce8e..fe4c079 100644
> > --- a/arch/sh/boot/compressed/misc.c
> > +++ b/arch/sh/boot/compressed/misc.c
> > @@ -106,11 +106,6 @@ static void error(char *x)
> >
> > 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");
> > @@ -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
> > --
> > 2.7.0
> >
--
Yoshinori Sato
<[email protected]>