From: Andrey Ryabinin <aryabinin@virtuozzo.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
<linux-pm@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Ingo Molnar" <mingo@kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Scott Bauer <scott.bauer@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"Alexander Potapenko" <glider@google.com>,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [PATCH v3] x86/suspend: fix false positive KASAN warning on suspend/resume
Date: Fri, 2 Dec 2016 17:45:18 +0300 [thread overview]
Message-ID: <d632571d-43cb-9dec-a51f-7cf8a6f91c0b@virtuozzo.com> (raw)
In-Reply-To: <20161202144240.3tect4hx4cks44iu@treble>
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);
> }
>
> /*
>
next prev parent reply other threads:[~2016-12-02 16:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-29 18:13 BUG: KASAN: stack-out-of-bounds in unwind_get_return_address Scott Bauer
2016-11-30 18:35 ` Josh Poimboeuf
2016-11-30 19:02 ` Scott Bauer
2016-11-30 23:10 ` [PATCH] x86/suspend: fix false positive KASAN warning on suspend/resume Josh Poimboeuf
2016-12-01 9:05 ` Andrey Ryabinin
2016-12-01 14:58 ` Josh Poimboeuf
2016-12-01 16:45 ` Josh Poimboeuf
2016-12-01 16:51 ` Dmitry Vyukov
2016-12-01 17:13 ` Josh Poimboeuf
2016-12-01 17:27 ` Dmitry Vyukov
2016-12-01 17:34 ` Josh Poimboeuf
2016-12-01 17:47 ` Dmitry Vyukov
2016-12-01 17:56 ` Josh Poimboeuf
2016-12-01 20:31 ` [PATCH v2] " Josh Poimboeuf
2016-12-02 9:44 ` Dmitry Vyukov
2016-12-02 12:54 ` Pavel Machek
2016-12-02 13:41 ` Andrey Ryabinin
2016-12-02 14:01 ` Josh Poimboeuf
2016-12-02 14:02 ` Dmitry Vyukov
2016-12-02 14:42 ` [PATCH v3] " Josh Poimboeuf
2016-12-02 14:45 ` Andrey Ryabinin [this message]
2016-12-02 15:08 ` Josh Poimboeuf
2016-12-02 17:42 ` [PATCH v4] " Josh Poimboeuf
2016-12-02 20:55 ` Andrey Ryabinin
2016-12-02 21:09 ` Pavel Machek
2016-12-02 21:57 ` Josh Poimboeuf
2016-12-08 0:10 ` Rafael J. Wysocki
2016-12-01 14:04 ` [PATCH] " Rafael J. Wysocki
2016-12-01 16:53 ` Josh Poimboeuf
2016-12-01 17:05 ` Rafael J. Wysocki
2016-12-02 10:15 ` Ingo Molnar
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