linux-kernel - Re: [PATCH 5/5] io_uring: add IORING_OP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <048cfbce-5238-2580-2d53-2ca740e72d79@kernel.dk>
Date:   Tue, 11 Jul 2023 15:22:08 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Arnd Bergmann <arnd@...db.de>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH 5/5] io_uring: add IORING_OP_WAITID support

On 7/11/23 3:11?PM, Arnd Bergmann wrote:
> On Tue, Jul 11, 2023, at 22:43, Jens Axboe wrote:
>> This adds support for an async version of waitid(2), in a fully async
>> version. If an event isn't immediately available, wait for a callback
>> to trigger a retry.
>>
>> The format of the sqe is as follows:
>>
>> sqe->len		The 'which', the idtype being queried/waited for.
>> sqe->fd			The 'pid' (or id) being waited for.
>> sqe->file_index		The 'options' being set.
>> sqe->addr2		A pointer to siginfo_t, if any, being filled in.
>>
>> buf_index, add3, and waitid_flags are reserved/unused for now.
>> waitid_flags will be used for options for this request type. One
>> interesting use case may be to add multi-shot support, so that the
>> request stays armed and posts a notification every time a monitored
>> process state change occurs.
>>
>> Note that this does not support rusage, on Arnd's recommendation.
>>
>> See the waitid(2) man page for details on the arguments.
>>
>> Signed-off-by: Jens Axboe <axboe@...nel.dk>
> 
> Does this require argument conversion for compat tasks?
> 
> Even without the rusage argument, I think the siginfo
> remains incompatible with 32-bit tasks, unfortunately.

Hmm yes good point, if compat_siginfo and siginfo are different, then it
does need handling for that. Would be a trivial addition, I'll make that
change. Thanks Arnd!

-- 
Jens Axboe