Messages in this thread | | | Subject | Re: [PATCH v3] x86/suspend: fix false positive KASAN warning on suspend/resume | From | Andrey Ryabinin <> | Date | Fri, 2 Dec 2016 17:45:18 +0300 |
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On 12/02/2016 05:42 PM, Josh Poimboeuf wrote:
> diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c > index 0e9505f..e9d8ba0 100644 > --- a/mm/kasan/kasan.c > +++ b/mm/kasan/kasan.c > @@ -80,7 +80,14 @@ void kasan_unpoison_task_stack(struct task_struct *task) > /* Unpoison the stack for the current task beyond a watermark sp value. */ > asmlinkage void kasan_unpoison_task_stack_below(const void *watermark) > { > - __kasan_unpoison_stack(current, watermark); > + /* > + * Calculate the task stack base address. Avoid using 'current' > + * because this function is called by early resume code which hasn't > + * yet set up the percpu register (%gs). > + */ > + void *base = (void *)((unsigned long)watermark & CURRENT_MASK);
CURRENT_MASK is defined only on x86...
> + > + kasan_unpoison_shadow(base, watermark - base); > } > > /* >
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