From: Pavel Begunkov <asml.silence-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Christian Brauner
<christian.brauner-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>,
Jens Axboe <axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
Cc: Stefan Metzmacher <metze-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
io-uring <io-uring-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux API Mailing List
<linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: IORING_REGISTER_CREDS[_UPDATE]() and credfd_create()?
Date: Wed, 29 Jan 2020 01:38:50 +0300 [thread overview]
Message-ID: <23cf858a-389e-676d-b239-155284eec6e3@gmail.com> (raw)
In-Reply-To: <20200128212533.snjm34gct3kmfxfi@wittgenstein>
[-- Attachment #1.1: Type: text/plain, Size: 578 bytes --]
On 29/01/2020 00:25, Christian Brauner wrote:
> I've been reading along quietly. In addition to what Jens said, to ease
> everyone's mind: pidfd_getfd() doesn't allow to unconditionally grab
> file descriptors for any task. That would be crazy. The calling task
> needs ptrace_may_access() permissions on the target task, i.e. the task
> from which you want to grab the io_uring file descriptor. And any
> calling task that has ptrace_may_access() permissions on the target can
> do much worse than just grabbing an fd.
Good to know, thanks!
--
Pavel Begunkov
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next prev parent reply other threads:[~2020-01-28 22:38 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
[not found] ` <ea9f2f27-e9fe-7016-5d5f-56fe1fdfc7a9-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-28 16:10 ` Jens Axboe
[not found] ` <d6bc8139-abbe-8a8d-7da1-4eeafd9eebe7-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 16:17 ` Stefan Metzmacher
[not found] ` <688e187a-75dd-89d9-921c-67de228605ce-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-28 16:19 ` Jens Axboe
[not found] ` <b29e972e-5ca0-8b5f-46b3-36f93d865723-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 17:19 ` Jens Axboe
[not found] ` <1ac31828-e915-6180-cdb4-36685442ea75-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 18:04 ` Jens Axboe
[not found] ` <0d4f43d8-a0c4-920b-5b8f-127c1c5a3fad-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 19:42 ` Jens Axboe
[not found] ` <b88f0590-71c9-d2bd-9d17-027b05d30d7a-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 20:16 ` Pavel Begunkov
[not found] ` <15ca72fd-5750-db7c-2404-2dd4d53dd196-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-28 20:19 ` Jens Axboe
[not found] ` <82b20ec2-ceaa-93f1-4cce-889a933f2c7a-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 20:50 ` Pavel Begunkov
[not found] ` <60253bd9-93a7-4d76-93b6-586e4f55138c-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-28 20:56 ` Jens Axboe
[not found] ` <43a57f2a-16da-e657-3dca-5aa3afe31318-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 21:25 ` Christian Brauner
2020-01-28 22:38 ` Pavel Begunkov [this message]
2020-01-28 23:36 ` Pavel Begunkov
[not found] ` <2d7e7fa2-e725-8beb-90b9-6476d48bdb33-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-28 23:40 ` Jens Axboe
[not found] ` <6c401e23-de7c-1fc1-4122-33d53fcf9700-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-28 23:51 ` Jens Axboe
[not found] ` <35eebae7-76dd-52ee-58b2-4f9e85caee40-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 0:10 ` Pavel Begunkov
[not found] ` <d3f9c1a4-8b28-3cfe-de88-503837a143bc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-29 0:15 ` Jens Axboe
[not found] ` <6415ae98-e205-5374-296d-0442e1ed2034-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 0:18 ` Jens Axboe
2020-01-29 0:20 ` Jens Axboe
[not found] ` <c9e58b5c-f66e-8406-16d5-fd6df1a27e77-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 0:21 ` Pavel Begunkov
[not found] ` <6e5ab6bf-6ff1-14df-1988-a80a7c6c9294-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-29 0:24 ` Jens Axboe
[not found] ` <2019e952-df2a-6b57-3571-73c525c5ba1a-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 0:54 ` Jens Axboe
[not found] ` <0df4904f-780b-5d5f-8700-41df47a1b470-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 10:17 ` Pavel Begunkov
[not found] ` <5406612e-299d-9d6e-96fc-c962eb93887f-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-29 13:11 ` Stefan Metzmacher
[not found] ` <821243e7-b470-ad7a-c1a5-535bee58e76d-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-29 13:41 ` Pavel Begunkov
[not found] ` <9a419bc5-4445-318d-87aa-1474b49266dd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-29 13:56 ` Stefan Metzmacher
[not found] ` <40d52623-5f9c-d804-cdeb-b7da6b13cb4f-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-29 14:23 ` Pavel Begunkov
[not found] ` <3e1289de-8d8e-49cf-cc9f-fb7bc67f35d5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-29 14:27 ` Stefan Metzmacher
[not found] ` <6ebe1e2f-77f4-ae88-e184-c140a911cbd8-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-29 14:34 ` Pavel Begunkov
2020-01-29 17:34 ` Jens Axboe
[not found] ` <9aef3b3b-7e71-f7f1-b366-2517b4d52719-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 17:42 ` Jens Axboe
[not found] ` <b3382961-8288-ec09-9019-5248f87dd86c-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-29 20:09 ` Stefan Metzmacher
[not found] ` <2d20bbcf-c04a-a02d-2850-cc7cc5a439f7-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-29 20:48 ` Jens Axboe
2020-01-29 17:46 ` Pavel Begunkov
2020-01-29 14:59 ` Jann Horn
[not found] ` <CAG48ez17Ums4s=gjai-Lakr2tWf9bjmYYeNb5aGrwAD51ypZMA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-01-29 17:34 ` Jens Axboe
[not found] ` <4f833fc5-b4c0-c304-c3c2-f63c050b90a2-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-30 1:08 ` Jens Axboe
[not found] ` <9ce2e571-ed84-211a-4e99-d830ecdaf0e2-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-30 2:20 ` Jens Axboe
[not found] ` <6372aa92-6b28-4a5f-ca6d-7741e1c8592e-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-30 3:18 ` Jens Axboe
2020-01-30 6:53 ` Stefan Metzmacher
2020-01-30 10:11 ` Jann Horn
[not found] ` <CAG48ez1qVCoOwcdA7YZcKObQ9frWNxCjHOp6RYeqd+q_n4KJJQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-01-30 10:26 ` Christian Brauner
2020-01-30 14:11 ` Jens Axboe
[not found] ` <cf801c52-7719-bb5c-c999-ab9aab0d4871-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2020-01-30 14:47 ` Stefan Metzmacher
[not found] ` <0b72d000-02be-9974-900f-d94af1cbc08a-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
2020-01-30 15:34 ` Jens Axboe
2020-01-30 15:13 ` Christian Brauner
2020-01-30 15:29 ` Jens Axboe
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