io-uring.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Pavel Begunkov <asml.silence@gmail.com>
To: Stefan Metzmacher <metze@samba.org>, Jens Axboe <axboe@kernel.dk>
Cc: io-uring <io-uring@vger.kernel.org>,
	Linux API Mailing List <linux-api@vger.kernel.org>
Subject: Re: IORING_REGISTER_CREDS[_UPDATE]() and credfd_create()?
Date: Wed, 29 Jan 2020 17:34:21 +0300	[thread overview]
Message-ID: <1f7cafc5-1969-1c6d-6fb1-441854d60fcb@gmail.com> (raw)
In-Reply-To: <6ebe1e2f-77f4-ae88-e184-c140a911cbd8@samba.org>

On 1/29/2020 5:27 PM, Stefan Metzmacher wrote:
>> Great, that you turned attention to that! override_creds() is already
>> grabbing a ref, so it shouldn't call get_cred() there.
>> So, that's a bug.
>>
>> It could be I'm wrong with the statement above, need to recheck all this
>> code to be sure.
>>
>> BTW, io_req_defer_prep() may be called twice for a req, so you will
>> reassign it without putting a ref. It's safer to leave NULL checks. At
>> least, until I've done reworking and fixing preparation paths.
> 
> Ok, but that would be already a bug in
> "io_uring/io-wq: don't use static creds/mm assignments"
> instead of logically being part of
> "io_uring: support using a registered personality for commands"

Right. Probably should be backported there, since it's just 2 commits
before.

-- 
Pavel Begunkov

  reply	other threads:[~2020-01-29 14:34 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28 10:18 IORING_REGISTER_CREDS[_UPDATE]() and credfd_create()? Stefan Metzmacher
2020-01-28 16:10 ` Jens Axboe
2020-01-28 16:17   ` Stefan Metzmacher
2020-01-28 16:19     ` Jens Axboe
2020-01-28 17:19       ` Jens Axboe
2020-01-28 18:04         ` Jens Axboe
2020-01-28 19:42           ` Jens Axboe
2020-01-28 20:16             ` Pavel Begunkov
2020-01-28 20:19               ` Jens Axboe
2020-01-28 20:50                 ` Pavel Begunkov
2020-01-28 20:56                   ` Jens Axboe
2020-01-28 21:25                     ` Christian Brauner
2020-01-28 22:38                       ` Pavel Begunkov
2020-01-28 23:36             ` Pavel Begunkov
2020-01-28 23:40               ` Jens Axboe
2020-01-28 23:51                 ` Jens Axboe
2020-01-29  0:10                   ` Pavel Begunkov
2020-01-29  0:15                     ` Jens Axboe
2020-01-29  0:18                       ` Jens Axboe
2020-01-29  0:20                     ` Jens Axboe
2020-01-29  0:21                       ` Pavel Begunkov
2020-01-29  0:24                         ` Jens Axboe
2020-01-29  0:54                           ` Jens Axboe
2020-01-29 10:17                             ` Pavel Begunkov
2020-01-29 13:11                               ` Stefan Metzmacher
2020-01-29 13:41                                 ` Pavel Begunkov
2020-01-29 13:56                                   ` Stefan Metzmacher
2020-01-29 14:23                                     ` Pavel Begunkov
2020-01-29 14:27                                       ` Stefan Metzmacher
2020-01-29 14:34                                         ` Pavel Begunkov [this message]
2020-01-29 17:34                                       ` Jens Axboe
2020-01-29 17:42                                         ` Jens Axboe
2020-01-29 20:09                                           ` Stefan Metzmacher
2020-01-29 20:48                                             ` Jens Axboe
2020-01-29 17:46                                         ` Pavel Begunkov
2020-01-29 14:59             ` Jann Horn
2020-01-29 17:34               ` Jens Axboe
2020-01-30  1:08                 ` Jens Axboe
2020-01-30  2:20                   ` Jens Axboe
2020-01-30  3:18                     ` Jens Axboe
2020-01-30  6:53                   ` Stefan Metzmacher
2020-01-30 10:11                   ` Jann Horn
2020-01-30 10:26                     ` Christian Brauner
2020-01-30 14:11                       ` Jens Axboe
2020-01-30 14:47                         ` Stefan Metzmacher
2020-01-30 15:34                           ` Jens Axboe
2020-01-30 15:13                         ` Christian Brauner
2020-01-30 15:29                           ` 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=1f7cafc5-1969-1c6d-6fb1-441854d60fcb@gmail.com \
    --to=asml.silence@gmail.com \
    --cc=axboe@kernel.dk \
    --cc=io-uring@vger.kernel.org \
    --cc=linux-api@vger.kernel.org \
    --cc=metze@samba.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).