From: Andrew Morton <akpm@linux-foundation.org>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Paul Menzel <pmenzel+linux-kasan-dev@molgen.mpg.de>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, stable@vger.kernel.org
Subject: Re: [PATCH] mm/kasan: Don't vfree() nonexistent vm_area.
Date: Tue, 22 May 2018 14:03:05 -0700 [thread overview]
Message-ID: <20180522140305.5e0f8c62dcc2d735ed4ee84c@linux-foundation.org> (raw)
In-Reply-To: <4fc394ae-65e8-7c51-112a-81bee0fb8429@virtuozzo.com>
On Tue, 22 May 2018 19:44:06 +0300 Andrey Ryabinin <aryabinin@virtuozzo.com> wrote:
> > Obviously we can't call vfree() to free memory that wasn't allocated via
> > vmalloc(). Use find_vm_area() to see if we can call vfree().
> >
> > Unfortunately it's a bit tricky to properly unmap and free shadow allocated
> > during boot, so we'll have to keep it. If memory will come online again
> > that shadow will be reused.
> >
> > Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
> > Reported-by: Paul Menzel <pmenzel+linux-kasan-dev@molgen.mpg.de>
> > Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
> > Cc: <stable@vger.kernel.org>
> > ---
>
> This seems stuck in -mm. Andrew, can we proceed?
OK.
Should there be a code comment explaining the situation that Matthew
asked about? It's rather obscure.
next prev parent reply other threads:[~2018-05-22 21:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <12c9e499-9c11-d248-6a3f-14ec8c4e07f1@molgen.mpg.de>
2018-02-01 16:33 ` Andrey Ryabinin
2018-02-01 19:57 ` Matthew Wilcox
2018-02-01 20:22 ` Andrey Ryabinin
2018-02-02 17:20 ` Matthew Wilcox
2018-02-05 8:48 ` Andrey Ryabinin
2018-05-18 15:57 ` David Hildenbrand
2018-05-18 16:01 ` David Hildenbrand
2018-05-22 16:44 ` Andrey Ryabinin
2018-05-22 21:03 ` Andrew Morton [this message]
2018-05-23 12:33 ` Andrey Ryabinin
2018-05-26 3:31 ` [PATCH] mm-kasan-dont-vfree-nonexistent-vm_area-fix kbuild test robot
2018-05-26 3:48 ` Andrew Morton
2018-05-28 4:13 ` Ian Kent
2018-05-28 4:39 ` Ian Kent
2018-05-29 4:01 ` Ian Kent
2018-05-30 11:53 ` kbuild test robot
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