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  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]
Date:   Sat, 22 Aug 2020 09:49:18 -0600
From:   Jens Axboe <>
To:     Luke Hsiao <>,
        David Miller <>
Cc:, Jakub Kicinski <>,
        Luke Hsiao <>,
        Arjun Roy <>,
        Soheil Hassas Yeganeh <>,
        Eric Dumazet <>
Subject: Re: [PATCH net-next v3 2/2] io_uring: ignore POLLIN for recvmsg on

On 8/21/20 10:41 PM, Luke Hsiao wrote:
> From: Luke Hsiao <>
> Currently, io_uring's recvmsg subscribes to both POLLERR and POLLIN. In
> the context of TCP tx zero-copy, this is inefficient since we are only
> reading the error queue and not using recvmsg to read POLLIN responses.
> This patch was tested by using a simple sending program to call recvmsg
> using io_uring with MSG_ERRQUEUE set and verifying with printks that the
> POLLIN is correctly unset when the msg flags are MSG_ERRQUEUE.

Perfect, and ends up being much simpler too and straight forward.

Jens Axboe

Powered by blists - more mailing lists