Re: [PATCH] x86/asm/entry/32: Reinstate clearing of pt_regs->r8..r11 on EFAULT path

[Denys Vlasenko]

On 06/08/2015 08:50 AM, Ingo Molnar wrote:
> * Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:
> 
>> I broke this recently when I changed pt_regs->r8..r11 clearing logic
>> in INT 80 code path.
>>
>> There is a branch from SYSENTER/SYSCALL code to INT 80 code:
>> if we fail to retrieve arg6, we return EFAULT. Before this patch,
>> in this case we don't clear pt_regs->r8..r11.
>>
>> This patch fixes this. The resulting code is smaller and simpler.
> 
> So how did you notice this bug - through actual info leak testing, or review?

By reviewing my own patch.
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