On 12/31/20 1:09 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3db1a3fa Merge tag 'staging-5.11-rc1' of git://git.kernel... > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=155708db500000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2ae878fbf640b72b > dashboard link: https://syzkaller.appspot.com/bug?extid=1819b70451246ed8cf57 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176b78c0d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12993797500000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1819b70451246ed8c...@syzkaller.appspotmail.com
#syz fix: net: sched: prevent invalid Scell_log shift count > IPVS: ftp: loaded support on port[0] = 21 > ================================================================================ > UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22 > shift exponent 255 is too large for 32-bit type 'int' > CPU: 0 PID: 8465 Comm: syz-executor194 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] > gred_change_vq net/sched/sch_gred.c:506 [inline] > gred_change.cold+0xce/0xe2 net/sched/sch_gred.c:702 > qdisc_change net/sched/sch_api.c:1331 [inline] > tc_modify_qdisc+0xd4e/0x1a30 net/sched/sch_api.c:1633 > rtnetlink_rcv_msg+0x493/0xb40 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+0x907/0xe10 net/netlink/af_netlink.c:1919 > sock_sendmsg_nosec net/socket.c:652 [inline] > sock_sendmsg+0xd3/0x130 net/socket.c:672 > ____sys_sendmsg+0x6e8/0x810 net/socket.c:2336 > ___sys_sendmsg+0xf3/0x170 net/socket.c:2390 > __sys_sendmsg+0xe5/0x1b0 net/socket.c:2423 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x440e69 > 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 0b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fff634be6d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00000000004a2730 RCX: 0000000000440e69 > RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 00007fff634be6e0 R08: 0000000120080522 R09: 0000000120080522 > R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004a2730 > R13: 0000000000402390 R14: 0000000000000000 R15: 0000000000000000 > ================================================================================ -- ~Randy
