[U-Boot] [PATCH v2] arm: bugfix: save_boot_params_default accesses uninitalized stack when -O0
Tetsuyuki Kobayashi
koba at kmckk.co.jp
Thu Jun 28 13:39:43 CEST 2012
I'm sorry. This post is missing In-Reply-To. I sent again. Discard this.
(2012/06/28 20:17), Tetsuyuki Kobayashi wrote:
> save_boot_params_default() in cpu.c accesses uninitialized stack area
> when it compiled with -O0 (not optimized).
>
> Signed-off-by: Tetsuyuki Kobayashi<koba at kmckk.co.jp>
> ---
> Changes for v2:
> - include<linux/compiler.h> and use __naked instead of __attribute__((naked))
>
>
> arch/arm/cpu/armv7/cpu.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
> index c6fa8ef..3e2a75c 100644
> --- a/arch/arm/cpu/armv7/cpu.c
> +++ b/arch/arm/cpu/armv7/cpu.c
> @@ -36,9 +36,13 @@
> #include<asm/system.h>
> #include<asm/cache.h>
> #include<asm/armv7.h>
> +#include<linux/compiler.h>
>
> +__naked /* don't save anything to stack even if compiled with -O0 */
> void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
> {
> + /* stack is not yet initialized */
> + asm("bx lr");
> }
>
> void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
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