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KMSAN: uninit-value in pppoe_connect

Status: fixed on 2018/05/08 18:30
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+4f03bdf92fdf9ef5ddab@syzkaller.appspotmail.com
Fix commit: a49e2f5d5fb1 pppoe: check sockaddr length in pppoe_connect()
First crash: 2196d, last: 2180d
▶ ▼ Duplicate bugs (1)
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
KMSAN: uninit-value in strnlen net C 137 2180d 2195d 0/26 closed as dup on 2018/04/23 15:01
▶ ▼ Discussions (8)
Title Replies (including bot) Last reply
[PATCH 3.16 000/366] 3.16.60-rc1 review 370 (370) 2019/03/29 15:47
[PATCH 4.4 00/50] 4.4.130-stable review 69 (69) 2018/05/12 19:44
[PATCH 4.16 00/81] 4.16.6-stable review 88 (88) 2018/04/28 15:52
[PATCH 4.14 00/80] 4.14.38-stable review 90 (90) 2018/04/28 14:28
[PATCH 4.9 00/74] 4.9.97-stable review 80 (80) 2018/04/28 14:26
[PATCH 3.18 00/24] 3.18.107-stable review 36 (36) 2018/04/28 14:24
[PATCH net] pppoe: check sockaddr length in pppoe_connect() 8 (8) 2018/04/27 16:27
KMSAN: uninit-value in pppoe_connect 0 (1) 2018/04/23 08:24

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in pppoe_connect+0x68c/0x2360 drivers/net/ppp/pppoe.c:628
CPU: 0 PID: 7012 Comm: syz-executor2 Not tainted 4.16.0+ #87
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:683
 pppoe_connect+0x68c/0x2360 drivers/net/ppp/pppoe.c:628
 SYSC_connect+0x41a/0x510 net/socket.c:1639
 SyS_connect+0x54/0x80 net/socket.c:1620
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455979
RSP: 002b:00007f25aa12dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f25aa12e6d4 RCX: 0000000000455979
RDX: 0000000000000004 RSI: 0000000020000040 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000064 R14: 00000000006f4a00 R15: 0000000000000000

Local variable description: ----address@SYSC_connect
Variable was created at:
 SYSC_connect+0x6f/0x510 net/socket.c:1622
 SyS_connect+0x54/0x80 net/socket.c:1620
==================================================================

Crashes (47):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/08 13:50 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 08:33 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/07 13:09 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 06:39 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 00:12 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/06 20:20 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 14:44 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 14:25 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 09:54 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 08:15 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 07:17 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/05 08:12 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/05 02:39 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 23:39 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 16:34 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 16:31 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 00:54 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/03 23:32 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/03 12:37 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/03 11:38 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/03 02:57 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/03 00:04 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 20:57 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 17:07 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 05:37 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 04:11 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 03:26 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 01:07 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 19:16 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 18:33 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 03:36 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/04/30 21:59 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/04/30 13:18 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 12:46 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 12:35 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 06:49 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 12:42 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/29 08:51 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/29 07:26 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/29 01:05 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/28 07:39 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/26 07:56 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report ci-upstream-kmsan-gce
2018/04/25 04:15 https://github.com/google/kmsan.git master d2d741e5d189 37e76fe2 .config console log report ci-upstream-kmsan-gce
2018/04/25 00:13 https://github.com/google/kmsan.git master d2d741e5d189 37e76fe2 .config console log report ci-upstream-kmsan-gce
2018/04/23 00:49 https://github.com/google/kmsan.git master d2d741e5d189 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/22 15:15 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.