From: Shakeel Butt <shakeelb@google.com>
To: andrey.konovalov@linux.dev
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrey Konovalov <andreyknvl@gmail.com>,
kasan-dev@googlegroups.com, Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/slub, kasan: fix checking page_alloc allocations on free
Date: Tue, 10 Aug 2021 17:17:53 -0700 [thread overview]
Message-ID: <CALvZod6d=Ri1K-cZMi_6MXuDnoRPdz5mCPN6DXRB8YyotV6d2w@mail.gmail.com> (raw)
In-Reply-To: <ef00ee9e0cf2b8fbcdf639d5038c373b69c0e1e1.1628639145.git.andreyknvl@gmail.com>
On Tue, Aug 10, 2021 at 4:47 PM <andrey.konovalov@linux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@gmail.com>
>
> A fix for stat counters f227f0faf63b ("slub: fix unreclaimable slab stat
> for bulk free") used page_address(page) as kfree_hook() argument instead
> of object. While the change is technically correct, it breaks KASAN's
> ability to detect improper (unaligned) pointers passed to kfree() and
> causes the kmalloc_pagealloc_invalid_free test to fail.
>
> This patch changes free_nonslab_page() to pass object to kfree_hook()
> instead of page_address(page) as it was before the fix.
>
> Fixed: f227f0faf63b ("slub: fix unreclaimable slab stat for bulk free")
> Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
The fix is already in the mm tree:
https://lkml.kernel.org/r/20210802180819.1110165-1-shakeelb@google.com
next prev parent reply other threads:[~2021-08-11 0:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-10 23:46 andrey.konovalov
2021-08-11 0:17 ` Shakeel Butt [this message]
2021-08-11 0:41 ` Andrey Konovalov
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