linux-kernel - Re: Endless loop in udp with MSG_SPLICE_READ - Re: [syzbot] [fs?] INFO: task hung in pipe

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: <810481.1690738378@warthog.procyon.org.uk>
Date:   Sun, 30 Jul 2023 18:32:58 +0100
From:   David Howells <dhowells@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     dhowells@...hat.com, Jakub Kicinski <kuba@...nel.org>,
        syzbot <syzbot+f527b971b4bdc8e79f9e@...kaller.appspotmail.com>,
        bpf@...r.kernel.org, brauner@...nel.org, davem@...emloft.net,
        dsahern@...nel.org, edumazet@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: Endless loop in udp with MSG_SPLICE_READ - Re: [syzbot] [fs?] INFO: task hung in pipe_release (4)

Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:

> The syzkaller repro runs in threaded mode, so syscalls should not be
> interpreted in order.

I think they are actually ordered.  It's kind of weirdly done, though,
flipping back and forth between threads and using futexes for synchronisation.

David