From: Eric Dumazet <eric.dumazet@gmail.com>
To: Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: davem@davemloft.net, jbaron@akamai.com, kgraul@linux.ibm.com,
ktkhai@virtuozzo.com, kyeongdon.kim@lge.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com, syzkaller-bugs@googlegroups.com,
xiyou.wangcong@gmail.com, hch@lst.de
Subject: Re: [PATCH] aio: prevent the final fput() in the middle of vfs_poll() (Re: KASAN: use-after-free Read in unix_dgram_poll)
Date: Sun, 3 Mar 2019 10:37:37 -0800 [thread overview]
Message-ID: <dd9d445c-4adc-67a7-8957-01f38cb39a70@gmail.com> (raw)
In-Reply-To: <20190303151846.GQ2217@ZenIV.linux.org.uk>
On 03/03/2019 07:18 AM, Al Viro wrote:
> Fixes: bfe4037e722ec
> Cc: stable@vger.kernel.org
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---
> diff --git a/fs/aio.c b/fs/aio.c
> index 3083180a54c8..7e88bfabdac2 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1767,6 +1767,7 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
>
> /* one for removal from waitqueue, one for this function */
> refcount_set(&aiocb->ki_refcnt, 2);
> + get_file(req->file);
>
> mask = vfs_poll(req->file, &apt.pt) & req->events;
> if (unlikely(!req->head)) {
> @@ -1793,6 +1794,7 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
> spin_unlock_irq(&ctx->ctx_lock);
>
> out:
> + fput(req->file);
> if (unlikely(apt.error)) {
> fput(req->file);
> return apt.error;
>
Very nice changelog Al, thanks for fixing this.
Reviewed-by: Eric Dumazet <edumazet@google.com>
next prev parent reply other threads:[~2019-03-03 18:37 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-03 10:22 KASAN: use-after-free Read in unix_dgram_poll syzbot
2019-03-03 13:55 ` Al Viro
2019-03-03 15:18 ` [PATCH] aio: prevent the final fput() in the middle of vfs_poll() (Re: KASAN: use-after-free Read in unix_dgram_poll) Al Viro
2019-03-03 18:37 ` Eric Dumazet [this message]
2019-03-03 19:44 ` Linus Torvalds
2019-03-03 20:13 ` Linus Torvalds
2019-03-03 20:30 ` Al Viro
2019-03-03 22:23 ` Linus Torvalds
2019-03-04 2:36 ` Al Viro
2019-03-04 21:22 ` Linus Torvalds
2019-03-07 0:03 ` [PATCH 1/8] aio: make sure file is pinned Al Viro
2019-03-07 0:03 ` [PATCH 2/8] aio_poll_wake(): don't set ->woken if we ignore the wakeup Al Viro
2019-03-07 2:18 ` Al Viro
2019-03-08 11:16 ` zhengbin (A)
2019-03-07 0:03 ` [PATCH 3/8] aio_poll(): sanitize the logics after vfs_poll(), get rid of leak on error Al Viro
2019-03-07 2:11 ` zhengbin (A)
2019-03-07 0:03 ` [PATCH 4/8] aio_poll(): get rid of weird refcounting Al Viro
2019-03-07 0:03 ` [PATCH 5/8] make aio_read()/aio_write() return int Al Viro
2019-03-07 0:03 ` [PATCH 6/8] move dropping ->ki_eventfd into iocb_put() Al Viro
2019-03-07 0:03 ` [PATCH 7/8] deal with get_reqs_available() in aio_get_req() itself Al Viro
2019-03-07 0:03 ` [PATCH 8/8] aio: move sanity checks and request allocation to io_submit_one() Al Viro
2019-03-07 0:23 ` [PATCH 1/8] aio: make sure file is pinned Linus Torvalds
2019-03-07 0:41 ` Al Viro
2019-03-07 0:48 ` Al Viro
2019-03-07 1:20 ` Al Viro
2019-03-07 1:30 ` Linus Torvalds
2019-03-08 3:36 ` Al Viro
2019-03-08 15:50 ` Christoph Hellwig
2019-03-10 7:06 ` Al Viro
2019-03-10 7:08 ` [PATCH 1/8] pin iocb through aio Al Viro
2019-03-10 7:08 ` [PATCH 2/8] keep io_event in aio_kiocb Al Viro
2019-03-11 19:43 ` Christoph Hellwig
2019-03-11 21:17 ` Al Viro
2019-03-10 7:08 ` [PATCH 3/8] aio: store event at final iocb_put() Al Viro
2019-03-11 19:44 ` Christoph Hellwig
2019-03-11 21:13 ` Al Viro
2019-03-11 22:52 ` Al Viro
2019-03-10 7:08 ` [PATCH 4/8] Fix aio_poll() races Al Viro
2019-03-11 19:58 ` Christoph Hellwig
2019-03-11 21:06 ` Al Viro
2019-03-12 19:18 ` Christoph Hellwig
2019-03-10 7:08 ` [PATCH 5/8] make aio_read()/aio_write() return int Al Viro
2019-03-11 19:44 ` Christoph Hellwig
2019-03-10 7:08 ` [PATCH 6/8] move dropping ->ki_eventfd into iocb_destroy() Al Viro
2019-03-11 19:46 ` Christoph Hellwig
2019-03-10 7:08 ` [PATCH 7/8] deal with get_reqs_available() in aio_get_req() itself Al Viro
2019-03-11 19:46 ` Christoph Hellwig
2019-03-10 7:08 ` [PATCH 8/8] aio: move sanity checks and request allocation to io_submit_one() Al Viro
2019-03-11 19:48 ` Christoph Hellwig
2019-03-11 21:12 ` Al Viro
2019-03-11 19:41 ` [PATCH 1/8] pin iocb through aio Christoph Hellwig
2019-03-11 19:41 ` [PATCH 1/8] aio: make sure file is pinned Christoph Hellwig
2019-03-04 7:53 ` [PATCH] aio: prevent the final fput() in the middle of vfs_poll() (Re: KASAN: use-after-free Read in unix_dgram_poll) Dmitry Vyukov
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