linux-kernel - Re: KASAN: slab-out-of-bounds Read in bitmap_ip

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Message-ID: <CAM_iQpUO2s2j0gbjYp8J3Q7J-peLChxL71+tzR0d6SphMZ7Aiw@mail.gmail.com>
Date:   Fri, 31 Jan 2020 13:02:08 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>, coreteam@...filter.org,
        David Miller <davem@...emloft.net>,
        Marco Elver <elver@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        jeremy@...zel.net, Kate Stewart <kstewart@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: KASAN: slab-out-of-bounds Read in bitmap_ip_add

On Fri, Jan 31, 2020 at 12:58 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Sun, Jan 26, 2020 at 8:01 PM syzbot
> <syzbot+f3e96783d74ee8ea9aa3@...kaller.appspotmail.com> wrote:
> >
> > syzbot has bisected this bug to:
>
> Ok, the bisection is obviously bogus - it just points to where the
> KASAN support was added to _notice_ the problem.
>
> But is somebody looking at the actual KASAN report itself?

It is supposed to be fixed by:

commit 32c72165dbd0e246e69d16a3ad348a4851afd415
Author: Kadlecsik József <kadlec@...ckhole.kfki.hu>
Date:   Sun Jan 19 22:06:49 2020 +0100

    netfilter: ipset: use bitmap infrastructure completely

Thanks.