From: Randy Dunlap <rdunlap@infradead.org>
To: syzbot <syzbot+4eda8c01ca2315d1722e@syzkaller.appspotmail.com>,
davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us,
kuba@kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com,
xiyou.wangcong@gmail.com
Subject: Re: UBSAN: shift-out-of-bounds in choke_change
Date: Tue, 29 Dec 2020 12:07:36 -0800 [thread overview]
Message-ID: <6106b587-1b5c-ba12-94d6-fe637e71abca@infradead.org> (raw)
In-Reply-To: <0000000000002aa9f905b79ef9c3@google.com>
Hi bot,
On 12/29/20 10:58 AM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 71c5f031 Merge tag 'docs-5.11-2' of git://git.lwn.net/linux
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15103693500000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3e7e34a83d606100
> dashboard link: https://syzkaller.appspot.com/bug?extid=4eda8c01ca2315d1722e
> compiler: gcc (GCC) 10.1.0-syz 20200507
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143d33ff500000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13725277500000
>
> Bisection is inconclusive: the issue happens on the oldest tested release.
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137f60db500000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=10ff60db500000
> console output: https://syzkaller.appspot.com/x/log.txt?x=177f60db500000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4eda8c01ca2315d1722e@syzkaller.appspotmail.com
#syz dup: UBSAN: shift-out-of-bounds in sfq_init
Fixed by:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=bd1248f1ddbc48b0c30565fce897a3b6423313b8
> netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
> netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
> netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
> ================================================================================
> UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22
> shift exponent 96 is too large for 32-bit type 'int'
> CPU: 0 PID: 8513 Comm: syz-executor800 Not tainted 5.10.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x107/0x163 lib/dump_stack.c:120
> ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
> __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
> red_set_parms include/net/red.h:252 [inline]
> choke_change.cold+0xce/0x115 net/sched/sch_choke.c:413
> qdisc_create+0x4ba/0x13a0 net/sched/sch_api.c:1246
> tc_modify_qdisc+0x4c8/0x1a30 net/sched/sch_api.c:1662
> rtnetlink_rcv_msg+0x498/0xb80 net/core/rtnetlink.c:5564
> netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
> netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
> netlink_sendmsg+0x907/0xe40 net/netlink/af_netlink.c:1919
> sock_sendmsg_nosec net/socket.c:652 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:672
> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
> ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x4437b9
> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fff205ca1d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004437b9
> RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004
> RBP: 00007fff205ca1e0 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
> R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007fff205ca1f0
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> ================================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
--
~Randy
prev parent reply other threads:[~2020-12-29 20:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 18:58 UBSAN: shift-out-of-bounds in choke_change syzbot
2020-12-29 20:07 ` Randy Dunlap [this message]
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