linux-kernel - [PATCH v2 0/2] iter revert problems

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Message-Id: <cover.1628780390.git.asml.silence@gmail.com>
Date:   Thu, 12 Aug 2021 21:40:45 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Cc:     Palash Oswal <oswalpalash@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-kernel@...r.kernel.org,
        syzbot+9671693590ef5aad8953@...kaller.appspotmail.com,
        asml.silence@...il.com
Subject: [PATCH v2 0/2] iter revert problems

For the bug description see 2/2. As mentioned there the current problems
is because of generic_write_checks(), but there was also a similar case
fixed in 5.12, which should have been triggerable by normal
write(2)/read(2) and others.

It may be better to enforce reexpands as a long term solution, but for
now this patchset is quickier and easier to backport.

v2: don't fail it has been justly fully reverted

Pavel Begunkov (2):
  iov_iter: mark truncated iters
  io_uring: don't retry with truncated iter

 fs/io_uring.c       | 16 ++++++++++++++++
 include/linux/uio.h |  5 ++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

-- 
2.32.0