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

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


             reply	other threads:[~2021-08-12 20:41 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-12 20:40 Pavel Begunkov [this message]
2021-08-12 20:40 ` [PATCH v2 1/2] iov_iter: mark truncated iters Pavel Begunkov
2021-08-12 20:40 ` [PATCH v2 2/2] io_uring: don't retry with truncated iter Pavel Begunkov
2021-08-16 15:35 ` [PATCH v2 0/2] iter revert problems Jens Axboe
2021-08-21 14:24 ` Pavel Begunkov
2021-08-21 22:25   ` Al Viro
2021-08-21 23:13     ` Jens Axboe
2021-08-23 12:28       ` David Laight

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