From: Cong Wang <xiyou.wangcong@gmail.com>
To: syzbot <syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com>
Cc: David Miller <davem@davemloft.net>,
Jamal Hadi Salim <jhs@mojatatu.com>,
Jiri Pirko <jiri@resnulli.us>, Jakub Kicinski <kuba@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: KASAN: slab-out-of-bounds Write in tcindex_set_parms
Date: Tue, 10 Mar 2020 11:31:06 -0700 [thread overview]
Message-ID: <CAM_iQpXrLCmQGXr8C9iw0+QxsP6DtQqoRqG18aegPhpjcpXdhQ@mail.gmail.com> (raw)
In-Reply-To: <000000000000490abd05a05fa060@google.com>
On Sun, Mar 8, 2020 at 3:44 PM syzbot
<syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 425c075d Merge branch 'tun-debug'
> git tree: net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=134d2ae3e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=598678fc6e800071
> dashboard link: https://syzkaller.appspot.com/bug?extid=c72da7b9ed57cde6fca2
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122ed70de00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116689fde00000
>
> The bug was bisected to:
>
> commit 599be01ee567b61f4471ee8078870847d0a11e8e
> Author: Cong Wang <xiyou.wangcong@gmail.com>
> Date: Mon Feb 3 05:14:35 2020 +0000
>
> net_sched: fix an OOB access in cls_tcindex
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=150a7d53e00000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=170a7d53e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=130a7d53e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com
> Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
>
> IPVS: ftp: loaded support on port[0] = 21
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in tcindex_set_parms+0x17fd/0x1a00 net/sched/cls_tcindex.c:455
> Write of size 16 at addr ffff8880a219e6b8 by task syz-executor508/9705
>
> CPU: 1 PID: 9705 Comm: syz-executor508 Not tainted 5.6.0-rc3-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x188/0x20d lib/dump_stack.c:118
> print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
> __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506
> kasan_report+0xe/0x20 mm/kasan/common.c:641
> tcindex_set_parms+0x17fd/0x1a00 net/sched/cls_tcindex.c:455
I think we probably don't check the boundary of 'handle' properly.
397 if (cp->perfect || valid_perfect_hash(cp))
398 if (handle >= cp->alloc_hash)
399 goto errout_alloc;
I will think more about it.
Thanks.
next prev parent reply other threads:[~2020-03-10 18:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-08 22:44 KASAN: slab-out-of-bounds Write in tcindex_set_parms syzbot
2020-03-10 18:31 ` Cong Wang [this message]
2020-03-11 0:33 ` Cong Wang
2020-03-11 4:56 ` syzbot
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