netdev - Re: KASAN: use-after-free Read in sock

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Message-ID: <20171130131833.GA28908@infradead.org>
Date:   Thu, 30 Nov 2017 05:18:33 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        syzbot 
        <bot+9abea25706ae35022385a41f61e579ed66e88a3f@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: KASAN: use-after-free Read in sock_release

On Thu, Nov 30, 2017 at 02:07:19AM +0000, Al Viro wrote:
> Incidentally, grepping for sys_close() shows another piece of fun in
> net/netfilter/xt_bpf.c.  Folks, ONCE DESCRIPTOR IS INSTALLED, THAT'S
> IT; THERE'S NO REMOVING IT ON FAILURE EXITS.  sys_close() should
> never, ever be used that way.  Sigh...

Would be great do unexport the thing.  Except that we also have
binfmt_misc (which looks legit) and autofs4, which on crack decided
that close() isn't a fun syscall, they'd much rather have an ioctl
that does exactly the same..