linux-kernel - Re: KASAN: use-after-free Read in __list_add

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Message-ID: <20180704232629.GJ725@sol.localdomain>
Date:   Wed, 4 Jul 2018 16:26:29 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Roland Dreier <roland@...estorage.com>
Cc:     linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, rds-devel@....oracle.com,
        syzbot <syzbot+db1c219466daac1083df@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __list_add_valid (5)

On Tue, May 15, 2018 at 01:49:23PM -0700, Roland Dreier wrote:
> > Still reproducible on Linus' tree (commit 66e1c94db3cd4e) and on linux-next
> > (next-20180511).  Here's a simplified reproducer:
> 
> Thanks!  That's a fantastic test case.
> 
> The issue is a race where rdma_listen() sees invalid state in the
> middle of an rdma_bind_addr() call that will ultimately fail.  I'll
> send a proposed patch shortly.
> 
>  - R.

Ping; there's still no fix merged for this.  The reproducer also works as an
unprivileged user.

- Eric