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KMSAN: uninit-value in tipc_nl_compat_doit

Status: fixed on 2019/03/06 07:43
Subsystems: tipc
[Documentation on labels]
Reported-by: syzbot+bca0dc46634781f08b38@syzkaller.appspotmail.com
Fix commit: 2753ca5d9009 tipc: fix uninit-value in tipc_nl_compat_doit
First crash: 2416d, last: 2115d
▶ ▼ Discussions (7)
Title Replies (including bot) Last reply
[PATCH 4.19 00/99] 4.19.17-stable review 109 (109) 2019/04/22 19:40
[PATCH 4.4 000/104] 4.4.172-stable review 111 (111) 2019/01/30 07:30
[PATCH 4.14 00/59] 4.14.95-stable review 65 (65) 2019/01/23 12:55
[PATCH 4.9 00/51] 4.9.152-stable review 56 (56) 2019/01/23 09:06
[PATCH 4.20 000/111] 4.20.4-stable review 120 (120) 2019/01/23 06:43
[net 0/6] tipc: fix uninit-value issues reported by syzbot 8 (8) 2019/01/16 04:29
KMSAN: uninit-value in tipc_nl_compat_doit 0 (1) 2018/09/20 20:44

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in tipc_nl_compat_doit+0x404/0xa10 net/tipc/netlink_compat.c:335
CPU: 0 PID: 4515 Comm: syz-executor081 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
 tipc_nl_compat_doit+0x404/0xa10 net/tipc/netlink_compat.c:335
 tipc_nl_compat_recv+0x164b/0x2700 net/tipc/netlink_compat.c:1153
 genl_family_rcv_msg net/netlink/genetlink.c:599 [inline]
 genl_rcv_msg+0x1686/0x1810 net/netlink/genetlink.c:624
 netlink_rcv_skb+0x378/0x600 net/netlink/af_netlink.c:2447
 genl_rcv+0x63/0x80 net/netlink/genetlink.c:635
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x166b/0x1740 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x1048/0x1310 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fda9
RSP: 002b:00007ffc7b6b00e8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fda9
RDX: 0000000000000000 RSI: 0000000020023000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004016d0
R13: 0000000000401760 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x9a6/0x1310 net/netlink/af_netlink.c:1875
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================

Crashes (153):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/27 07:11 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 01:38 https://github.com/google/kmsan.git master d2d741e5d189 37e76fe2 .config console log report syz C ci-upstream-kmsan-gce
2019/02/19 07:31 https://github.com/google/kmsan.git master fa1981bee40f 59f36113 .config console log report ci-upstream-kmsan-gce
2019/02/14 14:17 https://github.com/google/kmsan.git master fa1981bee40f 6a46f448 .config console log report ci-upstream-kmsan-gce
2019/02/13 18:10 https://github.com/google/kmsan.git master fa1981bee40f 0a49c954 .config console log report ci-upstream-kmsan-gce
2019/01/18 11:42 https://github.com/google/kmsan.git master 02f2d5aea531 5bf17c30 .config console log report ci-upstream-kmsan-gce
2019/01/16 12:52 https://github.com/google/kmsan.git master 02f2d5aea531 b47fa78d .config console log report ci-upstream-kmsan-gce
2019/01/16 06:31 https://github.com/google/kmsan.git master 02f2d5aea531 b47fa78d .config console log report ci-upstream-kmsan-gce
2019/01/14 17:18 https://github.com/google/kmsan.git master 02f2d5aea531 95485883 .config console log report ci-upstream-kmsan-gce
2019/01/13 00:04 https://github.com/google/kmsan.git master 02f2d5aea531 c3f3344c .config console log report ci-upstream-kmsan-gce
2019/01/09 23:39 https://github.com/google/kmsan.git master a6846a32c96d 45c0c1b1 .config console log report ci-upstream-kmsan-gce
2019/01/08 08:14 https://github.com/google/kmsan.git master 48128c3ca084 37dd2683 .config console log report ci-upstream-kmsan-gce
2019/01/05 18:45 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report ci-upstream-kmsan-gce
2019/01/05 14:51 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report ci-upstream-kmsan-gce
2019/01/05 04:17 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report ci-upstream-kmsan-gce
2019/01/02 12:20 https://github.com/google/kmsan.git master 8ba10281f9e5 f0491811 .config console log report ci-upstream-kmsan-gce
2019/01/02 09:08 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2019/01/01 21:23 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2019/01/01 05:32 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2019/01/01 01:53 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2018/12/30 16:15 https://github.com/google/kmsan.git master 8ba10281f9e5 9942de5f .config console log report ci-upstream-kmsan-gce
2018/12/28 12:07 https://github.com/google/kmsan.git master 79fc24ff6184 fc6ae81a .config console log report ci-upstream-kmsan-gce
2018/12/24 22:22 https://github.com/google/kmsan.git master 79fc24ff6184 8a41a0ad .config console log report ci-upstream-kmsan-gce
2018/12/24 21:18 https://github.com/google/kmsan.git master 79fc24ff6184 8a41a0ad .config console log report ci-upstream-kmsan-gce
2018/12/22 06:01 https://github.com/google/kmsan.git master 75b3ad224f19 603b5124 .config console log report ci-upstream-kmsan-gce
2018/12/19 17:17 https://github.com/google/kmsan.git master 49d30e29c6d8 fe2dc057 .config console log report ci-upstream-kmsan-gce
2018/12/15 11:19 https://github.com/google/kmsan.git master 0a602458c72c c9128939 .config console log report ci-upstream-kmsan-gce
2018/10/15 09:52 https://github.com/google/kmsan.git master 22ec98c3e38f caf12900 .config console log report ci-upstream-kmsan-gce
2018/08/29 00:33 https://github.com/google/kmsan.git master 2dca2cbde67a b771b17e .config console log report ci-upstream-kmsan-gce
2018/08/28 08:42 https://github.com/google/kmsan.git master 0cc51dc9a291 7ef1de9e .config console log report ci-upstream-kmsan-gce
2018/08/27 22:49 https://github.com/google/kmsan.git master 0cc51dc9a291 7ef1de9e .config console log report ci-upstream-kmsan-gce
2018/08/27 20:33 https://github.com/google/kmsan.git master 0cc51dc9a291 758cd203 .config console log report ci-upstream-kmsan-gce
2018/08/26 16:02 https://github.com/google/kmsan.git master 0cc51dc9a291 758cd203 .config console log report ci-upstream-kmsan-gce
2018/08/26 14:52 https://github.com/google/kmsan.git master 0cc51dc9a291 758cd203 .config console log report ci-upstream-kmsan-gce
2018/08/24 21:00 https://github.com/google/kmsan.git master 0cc51dc9a291 9b0f5c75 .config console log report ci-upstream-kmsan-gce
2018/08/23 19:47 https://github.com/google/kmsan.git master 0cc51dc9a291 95b5c82b .config console log report ci-upstream-kmsan-gce
2018/08/20 19:53 https://github.com/google/kmsan.git master 0cc51dc9a291 95b5c82b .config console log report ci-upstream-kmsan-gce
2018/08/20 03:08 https://github.com/google/kmsan.git master 0cc51dc9a291 2dc4378f .config console log report ci-upstream-kmsan-gce
2018/08/19 11:59 https://github.com/google/kmsan.git master 0cc51dc9a291 2dc4378f .config console log report ci-upstream-kmsan-gce
2018/08/18 22:19 https://github.com/google/kmsan.git master 0cc51dc9a291 de20bcbb .config console log report ci-upstream-kmsan-gce
2018/08/17 11:01 https://github.com/google/kmsan.git master 0cc51dc9a291 9ccc1d45 .config console log report ci-upstream-kmsan-gce
2018/08/17 07:05 https://github.com/google/kmsan.git master 0cc51dc9a291 9ccc1d45 .config console log report ci-upstream-kmsan-gce
2018/08/17 04:34 https://github.com/google/kmsan.git master 0cc51dc9a291 9ccc1d45 .config console log report ci-upstream-kmsan-gce
2018/08/16 05:46 https://github.com/google/kmsan.git master 0cc51dc9a291 9ccc1d45 .config console log report ci-upstream-kmsan-gce
2018/08/16 05:41 https://github.com/google/kmsan.git master 0cc51dc9a291 9ccc1d45 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.