syzbot


WARNING in u32_change

Status: upstream: reported C repro on 2022/09/25 11:50
Reported-by: syzbot+a2c4601efc75848ba321@syzkaller.appspotmail.com
Fix commit: 7cba18332e36 net: sched: cls_u32: Avoid memcpy() false-positive warning
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 75d, last: 16d

Sample crash report:
------------[ cut here ]------------
memcpy: detected field-spanning write (size 80) of single field "&n->sel" at net/sched/cls_u32.c:1043 (size 16)
WARNING: CPU: 0 PID: 3608 at net/sched/cls_u32.c:1043 u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043
Modules linked in:
CPU: 0 PID: 3608 Comm: syz-executor971 Not tainted 6.0.0-rc6-next-20220921-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022
RIP: 0010:u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043
Code: f4 df 14 fa 48 8b b5 78 fe ff ff b9 10 00 00 00 48 c7 c2 20 f7 f5 8a 48 c7 c7 a0 f6 f5 8a c6 05 55 b3 63 06 01 e8 db d6 df 01 <0f> 0b e9 73 f3 ff ff e8 c2 df 14 fa 48 c7 c7 00 fc f5 8a e8 66 ed
RSP: 0018:ffffc90003d7f300 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffc90003d7f618 RCX: 0000000000000000
RDX: ffff8880235f1d40 RSI: ffffffff81620348 RDI: fffff520007afe52
RBP: ffffc90003d7f4a0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 203a7970636d656d R12: ffff888021d420e0
R13: ffffc90003d7f5b8 R14: ffff888021d43c30 R15: ffff888021d42000
FS:  0000555555f71300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000064a110 CR3: 000000002824c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tc_new_tfilter+0x938/0x2190 net/sched/cls_api.c:2146
 rtnetlink_rcv_msg+0x955/0xca0 net/core/rtnetlink.c:6082
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f97a4bf4e69
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdcaf10028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f97a4bf4e69
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006
RBP: 00007f97a4bb9010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f97a4bb90a0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Crashes (27):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2022/09/21 20:48 linux-next 483fed3b5dc8 380f82fb .config log report syz C WARNING in u32_change
ci-upstream-kasan-gce-386 2022/10/08 14:35 upstream e8bc52cb8df8 aea5da89 .config log report info WARNING in u32_change
ci-upstream-net-this-kasan-gce 2022/11/18 20:23 net 11b64a466c95 5bb70014 .config log report info WARNING in u32_change
ci-upstream-net-kasan-gce 2022/11/10 10:13 net-next fbeb229a6622 b2488a87 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/15 10:46 linux-next aaa11ce2ffc8 67cb024c .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/15 10:36 linux-next aaa11ce2ffc8 67cb024c .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/14 18:45 linux-next aaa11ce2ffc8 4954e4b2 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/09 12:36 linux-next aaa11ce2ffc8 aea5da89 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/09 12:25 linux-next aaa11ce2ffc8 aea5da89 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/07 03:38 linux-next aaa11ce2ffc8 8a212197 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/04 09:37 linux-next aaa11ce2ffc8 feb56351 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/04 09:18 linux-next aaa11ce2ffc8 feb56351 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/04 09:08 linux-next aaa11ce2ffc8 feb56351 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/10/01 08:16 linux-next aaa11ce2ffc8 feb56351 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/30 09:03 linux-next aaa11ce2ffc8 1d385642 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/28 05:41 linux-next aaa11ce2ffc8 75c78242 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/28 05:41 linux-next aaa11ce2ffc8 75c78242 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/27 08:58 linux-next aaa11ce2ffc8 10323ddf .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/25 18:55 linux-next aaa11ce2ffc8 0042f2b4 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/25 18:55 linux-next aaa11ce2ffc8 0042f2b4 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/25 18:54 linux-next aaa11ce2ffc8 0042f2b4 .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 17:08 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 16:55 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 14:49 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 13:55 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 12:43 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
ci-upstream-linux-next-kasan-gce-root 2022/09/21 11:48 linux-next 483fed3b5dc8 380f82fb .config log report info WARNING in u32_change
* Struck through repros no longer work on HEAD.