syzbot


UBSAN: undefined-behaviour in tcf_police_init

Status: upstream: reported C repro on 2020/09/21 01:54
Reported-by: syzbot+dea15950ad33192f1733@syzkaller.appspotmail.com
First crash: 1534d, last: 1518d
Fix bisection: failed (error log, bisect log)
  

Sample crash report:
netlink: 32 bytes leftover after parsing attributes in process `syz-executor752'.
netlink: 3092 bytes leftover after parsing attributes in process `syz-executor752'.
================================================================================
UBSAN: Undefined behaviour in net/sched/act_police.c:161:27
shift exponent 45 is too large for 32-bit type 'int'
CPU: 0 PID: 6499 Comm: syz-executor752 Not tainted 4.19.149-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+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
 tcf_police_init.cold+0x34/0x86 net/sched/act_police.c:161
 tcf_action_init_1+0x962/0xc40 net/sched/act_api.c:870
 tcf_action_init+0x2c3/0x490 net/sched/act_api.c:933
 tcf_action_add+0xd9/0x360 net/sched/act_api.c:1314
 tc_ctl_action+0x337/0x417 net/sched/act_api.c:1369
 rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc7/0x130 net/socket.c:632
 ___sys_sendmsg+0x3b3/0x8f0 net/socket.c:2115
 __sys_sendmmsg+0x195/0x470 net/socket.c:2210
 __do_sys_sendmmsg net/socket.c:2239 [inline]
 __se_sys_sendmmsg net/socket.c:2236 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440389
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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff8

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/10/06 03:38 linux-4.19.y b09c34517e1a 1880b4a9 .config console log report syz C ci2-linux-4-19
2020/09/21 02:07 linux-4.19.y 015e94d0e37b 9564d2e9 .config console log report syz C ci2-linux-4-19
2020/10/06 06:40 linux-4.19.y b09c34517e1a 1880b4a9 .config console log report info ci2-linux-4-19
2020/10/06 01:23 linux-4.19.y b09c34517e1a 1880b4a9 .config console log report info ci2-linux-4-19
2020/10/05 17:58 linux-4.19.y b09c34517e1a 1880b4a9 .config console log report info ci2-linux-4-19
2020/10/05 08:50 linux-4.19.y b09c34517e1a 5ef9c291 .config console log report info ci2-linux-4-19
2020/10/03 07:50 linux-4.19.y b09c34517e1a 2653fa43 .config console log report info ci2-linux-4-19
2020/10/01 04:57 linux-4.19.y 10ad6cfd5736 a9767fb2 .config console log report info ci2-linux-4-19
2020/10/01 02:07 linux-4.19.y 10ad6cfd5736 a9767fb2 .config console log report info ci2-linux-4-19
2020/09/30 09:44 linux-4.19.y 10ad6cfd5736 8516f6d3 .config console log report info ci2-linux-4-19
2020/09/30 09:44 linux-4.19.y 10ad6cfd5736 8516f6d3 .config console log report info ci2-linux-4-19
2020/09/30 04:01 linux-4.19.y 10ad6cfd5736 5abc3f1a .config console log report info ci2-linux-4-19
2020/09/30 02:41 linux-4.19.y 10ad6cfd5736 5abc3f1a .config console log report info ci2-linux-4-19
2020/09/29 19:24 linux-4.19.y 10ad6cfd5736 5abc3f1a .config console log report info ci2-linux-4-19
2020/09/28 14:37 linux-4.19.y 10ad6cfd5736 6bfdbe89 .config console log report info ci2-linux-4-19
2020/09/28 06:23 linux-4.19.y 10ad6cfd5736 5dd8aee8 .config console log report info ci2-linux-4-19
2020/09/21 01:54 linux-4.19.y 015e94d0e37b 9564d2e9 .config console log report info ci2-linux-4-19
* Struck through repros no longer work on HEAD.