[U-Boot] [PATCH] arm: bugfix: save_boot_params_default accesses uninitalized stack when -O0

[Tetsuyuki Kobayashi]

Hi Tom, thank you for reviewing.

(2012/06/28 2:40), Tom Rini wrote:
> On Mon, Jun 25, 2012 at 09:42:29PM +0900, 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>
>> ---
>>   arch/arm/cpu/armv7/cpu.c |    3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
>> index c6fa8ef..6104cb2 100644
>> --- a/arch/arm/cpu/armv7/cpu.c
>> +++ b/arch/arm/cpu/armv7/cpu.c
>> @@ -37,8 +37,11 @@
>>   #include<asm/cache.h>
>>   #include<asm/armv7.h>
>>
>> +__attribute__((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");
>>   }
>
> Please add<linux/compiler.h>  and use __naked instead.  Thanks!
>
OK. I will post V2 patch.