linux-kernel - [PATCH 0/2] aio poll: fix use-after-free and missing wakeups

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Date:   Fri,  3 Dec 2021 16:22:59 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Benjamin LaHaise <bcrl@...ck.org>
Cc:     linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ramji Jiyani <ramjiyani@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        stable@...r.kernel.org
Subject: [PATCH 0/2] aio poll: fix use-after-free and missing wakeups

This series fixes some bugs in aio poll.  This is intended to replace
"[PATCH v5] aio: Add support for the POLLFREE"
(https://lore.kernel.org/r/20211027011834.2497484-1-ramjiyani@google.com)
which has some bugs.

Careful review is appreciated; this code is very hard to work with, and
I don't know of an easy way to test it.

Note, it looks like io_uring has these same bugs too.  I haven't tried
to fix io_uring.

This applies to v5.16-rc3.

Eric Biggers (2):
  aio: keep poll requests on waitqueue until completed
  aio: fix use-after-free due to missing POLLFREE handling

 fs/aio.c                        | 138 +++++++++++++++++++++++++-------
 include/uapi/asm-generic/poll.h |   2 +-
 2 files changed, 111 insertions(+), 29 deletions(-)

base-commit: d58071a8a76d779eedab38033ae4c821c30295a5
-- 
2.34.1