From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [BUG] io_uring: defer logic based on shared data
Date: Fri, 25 Oct 2019 12:55:25 +0300 [thread overview]
Message-ID: <5badf1c0-9a7d-0950-2943-ff8db33e0929@gmail.com> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 343 bytes --]
I found 2 problems with __io_sequence_defer().
1. it uses @sq_dropped, but doesn't consider @cq_overflow
2. @sq_dropped and @cq_overflow are write-shared with userspace, so
it can be maliciously changed.
see sent liburing test (test/defer *_hung()), which left an unkillable
process for me
--
Yours sincerely,
Pavel Begunkov
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next reply other threads:[~2019-10-25 9:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 9:55 Pavel Begunkov [this message]
2019-10-25 16:03 ` [BUG] io_uring: defer logic based on shared data Jens Axboe
2019-10-25 16:09 ` Jens Axboe
2019-10-25 16:21 ` Jens Axboe
2019-10-25 16:21 ` Pavel Begunkov
2019-10-25 16:27 ` Jens Axboe
2019-10-25 16:32 ` Jens Axboe
2019-10-25 16:40 ` Pavel Begunkov
2019-10-25 16:44 ` Jens Axboe
2019-10-25 16:55 ` Pavel Begunkov
2019-10-25 16:57 ` Jens Axboe
2019-10-25 18:13 ` Pavel Begunkov
2019-10-25 18:17 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5badf1c0-9a7d-0950-2943-ff8db33e0929@gmail.com \
--to=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.