GNU/Weeb Mailing List <[email protected]>
 help / color / mirror / Atom feed
From: Ammar Faizi <[email protected]>
To: Jens Axboe <[email protected]>
Cc: "Ammar Faizi" <[email protected]>,
	"Barnabás Pőcze" <[email protected]>,
	"Michael William Jonathan" <[email protected]>,
	"Linux Kernel Mailing List" <[email protected]>,
	"io-uring Mailing List" <[email protected]>,
	"GNU/Weeb Mailing List" <[email protected]>
Subject: [PATCH liburing v1 0/2] 2 fixes for recv-msgall.c
Date: Wed, 10 May 2023 21:39:25 +0700	[thread overview]
Message-ID: <[email protected]> (raw)

Hi Jens,

This is the follow up patchset for the recent issue found in
recv-msgall.c. There are two patches in this series.

1. Fix undefined behavior in `recv_prep()`.
The lifetime of `struct msghdr msg;` must be long enough until the CQE
is generated because the recvmsg operation will write to that storage. I
found this test segfault when compiling with -O0 optimization. This is
undefined behavior and may behave randomly. Fix this by making the
lifetime of `struct msghdr msg;` long enough.

2. Fix invalid mutex usage.
Calling pthread_mutex_lock() twice with the same mutex in the same
thread without unlocking it first is invalid. The intention behind this
pattern was to wait for the recv_fn() thread to be ready. Use the
pthread barrier instead. It is more straightforward and correct.

Please apply!

Signed-off-by: Ammar Faizi <[email protected]>

Ammar Faizi (2):
  recv-msgall: Fix undefined behavior in `recv_prep()`
  recv-msgall: Fix invalid mutex usage

 test/recv-msgall.c | 44 +++++++++++++++++++++-----------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

base-commit: 4961ac480052089a94978e9f771d513551aff61b
Ammar Faizi

             reply	other threads:[~2023-05-10 14:40 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-10 14:39 Ammar Faizi [this message]
2023-05-10 14:39 ` [PATCH liburing v1 1/2] recv-msgall: Fix undefined behavior in `recv_prep()` Ammar Faizi
2023-05-10 14:39 ` [PATCH liburing v1 2/2] recv-msgall: Fix invalid mutex usage Ammar Faizi
2023-05-10 15:17 ` [PATCH liburing v1 0/2] 2 fixes for recv-msgall.c 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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \

* 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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox