syzbot


KMSAN: uninit-value in sctp_sendmsg

Status: fixed on 2018/05/08 18:30
Subsystems: sctp
[Documentation on labels]
Fix commit: 81e98370293a sctp: sctp_sockaddr_af must check minimal addr length for AF_INET6
First crash: 2258d, last: 2228d

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in sctp_sockaddr_af net/sctp/socket.c:359 [inline]
BUG: KMSAN: uninit-value in sctp_verify_addr net/sctp/socket.c:227 [inline]
BUG: KMSAN: uninit-value in sctp_sendmsg+0x1ced/0x6020 net/sctp/socket.c:1660
CPU: 1 PID: 3611 Comm: syz-executor3 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 sctp_sockaddr_af net/sctp/socket.c:359 [inline]
 sctp_verify_addr net/sctp/socket.c:227 [inline]
 sctp_sendmsg+0x1ced/0x6020 net/sctp/socket.c:1660
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f4c452a7c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4c452a86d4 RCX: 0000000000455259
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000072bea0 R08: 00000000209e1000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f8 R14: 00000000006fa7e0 R15: 0000000000000000

Local variable description: ----address@SYSC_sendto
Variable was created at:
 SYSC_sendto+0xb8/0x7e0 net/socket.c:1718
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3611 Comm: syz-executor3 Tainted: G    B            4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 panic+0x39d/0x940 kernel/panic.c:183
 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 sctp_sockaddr_af net/sctp/socket.c:359 [inline]
 sctp_verify_addr net/sctp/socket.c:227 [inline]
 sctp_sendmsg+0x1ced/0x6020 net/sctp/socket.c:1660
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f4c452a7c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4c452a86d4 RCX: 0000000000455259
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000072bea0 R08: 00000000209e1000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f8 R14: 00000000006fa7e0 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (27):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/08 11:11 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz ci-upstream-kmsan-gce
2018/05/08 03:15 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/06 07:02 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 05:25 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/05 08:38 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/05 01:16 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/05 00:10 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/02 17:16 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 13:43 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 22:58 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/04/30 06:26 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 00:29 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/27 11:04 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report ci-upstream-kmsan-gce
2018/04/22 16:43 https://github.com/google/kmsan.git master d2d741e5d189 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/19 16:42 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 15:04 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 11:24 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/19 10:25 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/19 10:16 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/19 08:27 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/18 23:34 https://github.com/google/kmsan.git master 48c6a2b0ab1b 829f0234 .config console log report ci-upstream-kmsan-gce
2018/04/17 19:51 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/13 09:08 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/11 04:38 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/10 12:21 https://github.com/google/kmsan.git master 35ff515e4bda 8e873e9d .config console log report ci-upstream-kmsan-gce
2018/04/09 15:24 https://github.com/google/kmsan.git master e2ab7e8abba4 f13fb445 .config console log report ci-upstream-kmsan-gce
2018/04/08 10:05 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.