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

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Message-Id: <cover.1628509745.git.asml.silence@gmail.com>
Date:   Mon,  9 Aug 2021 12:52:35 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        io-uring@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, asml.silence@...il.com
Subject: [PATCH 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.

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

 fs/io_uring.c       | 6 ++++++
 include/linux/uio.h | 5 ++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

-- 
2.32.0