linux-kernel - Re: 4.9.0 regression in pipe-backed iov

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: <CA+55aFybndhA_RPd6gAPmbYYzOL5Le1tCjb2GYVGgFVU8xoD+g@mail.gmail.com>
Date:   Thu, 12 Jan 2017 15:28:32 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Alan J. Wylie" <alan@...ie.me.uk>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn

On Thu, Jan 12, 2017 at 2:46 PM, Alan J. Wylie <alan@...ie.me.uk> wrote:
>
> I'm off to bed now with a stinking head cold I'm afraid.

So assuming Al hasn't figured it out by the time you get back, can you
try to send us the same strace for the working case?

That fd5 (ptmx) does have O_NONBLOCK, so maybe the EAGAIN actually
comes from reading the ptmx, rather than the new AGAIN in fs/splice.c.
But if so, I'd have expected the old code to do the same thing. Ho
humm.

               Linus