syzbot


divide error in ___bpf_prog_run

Status: fixed on 2018/01/22 13:19
Subsystems: bpf
[Documentation on labels]
Reported-by: syzbot+48340bb518e88849e2e3@syzkaller.appspotmail.com
Fix commit: 68fda450a7df bpf: fix 32-bit divide by zero
First crash: 2322d, last: 2314d
Discussions (5)
Title Replies (including bot) Last reply
[PATCH 4.4 00/67] 4.4.115-stable review 76 (76) 2018/03/03 09:14
[PATCH 4.9 00/66] 4.9.79-stable review 72 (72) 2018/02/28 15:46
[PATCH 4.14 00/71] 4.14.16-stable review 77 (77) 2018/01/30 14:52
divide error in ___bpf_prog_run 27 (30) 2018/01/22 13:31
[PATCH bpf] bpf: fix 32-bit divide by zero 6 (6) 2018/01/18 23:33

Sample crash report:
audit: type=1400 audit(1515803258.227:9): avc:  denied  { prog_run } for  pid=3501 comm="syzkaller889957" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
divide error: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3501 Comm: syzkaller889957 Not tainted 4.15.0-rc7+ #259
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:___bpf_prog_run+0x3b6a/0x5ec0 kernel/bpf/core.c:962
RSP: 0018:ffff8801c70fef68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc90000002030 RDI: ffffc90000002049
RBP: ffff8801c70ff068 R08: 1ffff10038e1fd85 R09: 0000000000000002
R10: ffff8801c70ff0e8 R11: 0000000000000000 R12: ffff8801c70ff0a0
R13: ffffc90000002048 R14: ffff8801c70ff0a0 R15: 00000000fffffffc
FS:  0000000001094880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020fd3000 CR3: 00000001bfc9c001 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __bpf_prog_run160+0xde/0x150 kernel/bpf/core.c:1308
 bpf_prog_run_save_cb include/linux/filter.h:546 [inline]
 sk_filter_trim_cap+0x33c/0x9c0 net/core/filter.c:103
 sk_filter include/linux/filter.h:675 [inline]
 netlink_unicast+0x1b9/0x700 net/netlink/af_netlink.c:1303
 nlmsg_unicast include/net/netlink.h:608 [inline]
 rtnl_unicast net/core/rtnetlink.c:636 [inline]
 rtnl_stats_get+0x7bb/0xa10 net/core/rtnetlink.c:4245
 rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
 netlink_rcv_skb+0x224/0x470 net/netlink/af_netlink.c:2408
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
 netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
 netlink_unicast+0x4ee/0x700 net/netlink/af_netlink.c:1301
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:648
 sock_write_iter+0x31a/0x5d0 net/socket.c:917
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x43ffc9
RSP: 002b:00007ffe33bdef98 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043ffc9
RDX: 0000000000000026 RSI: 0000000020fd3000 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000401930
R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000
Code: 89 85 58 ff ff ff 41 0f b6 55 01 c0 ea 04 0f b6 d2 4d 8d 34 d4 4c 89 f2 48 c1 ea 03 80 3c 1a 00 0f 85 8a 1c 00 00 41 8b 0e 31 d2 <48> f7 f1 48 89 85 58 ff ff ff 41 0f b6 45 01 83 e0 0f 4d 8d 34 
RIP: ___bpf_prog_run+0x3b6a/0x5ec0 kernel/bpf/core.c:962 RSP: ffff8801c70fef68
---[ end trace 0990308e5da64aa8 ]---

Crashes (28):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/01/13 00:29 upstream c92a9a461dff 9dc808a6 .config console log report syz C ci-upstream-kasan-gce
2018/01/13 00:15 upstream c92a9a461dff 9dc808a6 .config console log report syz C ci-upstream-kasan-gce-386
2018/01/13 00:43 net-next-old 19d28fbd306e 9dc808a6 .config console log report syz C ci-upstream-net-kasan-gce
2018/01/13 00:30 linux-next 3e53c7415294 9dc808a6 .config console log report syz C ci-upstream-next-kasan-gce
2018/01/13 00:28 mmots 2c405fa05106 9dc808a6 .config console log report syz C ci-upstream-mmots-kasan-gce
2018/01/16 20:27 upstream a8750ddca918 a46e5318 .config console log report ci-upstream-kasan-gce
2018/01/16 05:11 upstream a8750ddca918 e17f4a5d .config console log report ci-upstream-kasan-gce
2018/01/13 09:04 upstream c92a9a461dff 9dc808a6 .config console log report ci-upstream-kasan-gce
2018/01/19 15:29 upstream dda3e15231b3 161c1d64 .config console log report ci-upstream-kasan-gce-386
2018/01/19 03:59 upstream dda3e15231b3 161c1d64 .config console log report ci-upstream-kasan-gce-386
2018/01/15 16:48 upstream a8750ddca918 66d492a6 .config console log report ci-upstream-kasan-gce-386
2018/01/14 07:02 upstream 2c1cfa499018 c9e7aeae .config console log report ci-upstream-kasan-gce-386
2018/01/12 23:52 upstream c92a9a461dff 9dc808a6 .config console log report ci-upstream-kasan-gce-386
2018/01/20 08:43 net-next-old 43dd7512b51c fbbdcd92 .config console log report ci-upstream-net-kasan-gce
2018/01/20 05:09 net-next-old 43dd7512b51c fbbdcd92 .config console log report ci-upstream-net-kasan-gce
2018/01/19 12:00 net-next-old ef58ca38dbda 161c1d64 .config console log report ci-upstream-net-kasan-gce
2018/01/19 07:32 net-next-old d680b3524cd2 161c1d64 .config console log report ci-upstream-net-kasan-gce
2018/01/19 02:51 net-next-old d680b3524cd2 161c1d64 .config console log report ci-upstream-net-kasan-gce
2018/01/18 09:09 net-next-old 4f7d58517f46 56cc113a .config console log report ci-upstream-net-kasan-gce
2018/01/16 20:16 net-next-old e02f08a07098 a46e5318 .config console log report ci-upstream-net-kasan-gce
2018/01/16 10:23 net-next-old 79d891c1bbb6 4198e588 .config console log report ci-upstream-net-kasan-gce
2018/01/16 04:08 net-next-old 594831a8aba3 e17f4a5d .config console log report ci-upstream-net-kasan-gce
2018/01/15 19:16 net-next-old 564737f981fb 66d492a6 .config console log report ci-upstream-net-kasan-gce
2018/01/15 02:27 net-next-old 1988c7957881 66d492a6 .config console log report ci-upstream-net-kasan-gce
2018/01/14 03:44 net-next-old 6bd39bc3da0f c9e7aeae .config console log report ci-upstream-net-kasan-gce
2018/01/13 16:02 net-next-old 6bd39bc3da0f c9e7aeae .config console log report ci-upstream-net-kasan-gce
2018/01/13 11:32 net-next-old 6bd39bc3da0f 9dc808a6 .config console log report ci-upstream-net-kasan-gce
2018/01/13 01:09 linux-next 3e53c7415294 9dc808a6 .config console log report ci-upstream-next-kasan-gce
* Struck through repros no longer work on HEAD.