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Message-ID: <87sh93az5d.wl-ysato@users.sourceforge.jp>
Date: Wed, 14 Mar 2018 16:34:38 +0900
From: Yoshinori Sato <ysato@...rs.sourceforge.jp>
To: Huacai Chen <chenhc@...ote.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
LKML <linux-kernel@...r.kernel.org>,
Ralf Baechle <ralf@...ux-mips.org>,
James Hogan <james.hogan@...s.com>,
Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
Russell King <linux@....linux.org.uk>,
linux-arm-kernel@...ts.infradead.org,
Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
stable <stable@...r.kernel.org>
Subject: Re: [PATCH V2] ZBOOT: fix stack protector in compressed boot phase
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 <chenhc@...ote.com> 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: stable@...r.kernel.org
> > Signed-off-by: Huacai Chen <chenhc@...ote.com>
> > ---
> > 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
<ysato@...rs.sourceforge.jp>
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