linux-kernel - Re: KASAN: slab-out-of-bounds Write in pipe

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Message-ID: <29474.1575563636@warthog.procyon.org.uk>
Date:   Thu, 05 Dec 2019 16:33:56 +0000
From:   David Howells <dhowells@...hat.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk,
        syzbot <syzbot+838eb0878ffd51f27c41@...kaller.appspotmail.com>
Subject: Re: KASAN: slab-out-of-bounds Write in pipe_write

Eric Biggers <ebiggers@...nel.org> wrote:

> It looks like the 'mask' variable in pipe_write() is not being updated after
> the pipe mutex was dropped in pipe_wait(), to take into account the pipe
> size possibly having been changed in the mean time.

There's that, but not only that.  Weirdness ensues if the ring size is 1 -
this may have to do with the mask then being 0.

David