syzbot


KMSAN: uninit-value in __inet_diag_dump

Status: fixed on 2020/10/10 01:52
Subsystems: net
[Documentation on labels]
Fix commit: d5e4d0a5e692 inet_diag: validate INET_DIAG_REQ_PROTOCOL attribute
First crash: 1370d, last: 1353d

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in inet_diag_lock_handler net/ipv4/inet_diag.c:55 [inline]
BUG: KMSAN: uninit-value in __inet_diag_dump+0x58c/0x720 net/ipv4/inet_diag.c:1147
CPU: 0 PID: 8505 Comm: syz-executor174 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:219
 inet_diag_lock_handler net/ipv4/inet_diag.c:55 [inline]
 __inet_diag_dump+0x58c/0x720 net/ipv4/inet_diag.c:1147
 inet_diag_dump_compat+0x2a5/0x380 net/ipv4/inet_diag.c:1254
 netlink_dump+0xb73/0x1cb0 net/netlink/af_netlink.c:2246
 __netlink_dump_start+0xcf2/0xea0 net/netlink/af_netlink.c:2354
 netlink_dump_start include/linux/netlink.h:246 [inline]
 inet_diag_rcv_msg_compat+0x5da/0x6c0 net/ipv4/inet_diag.c:1288
 sock_diag_rcv_msg+0x24f/0x620 net/core/sock_diag.c:256
 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2470
 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:275
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmsg+0x6d1/0x820 net/socket.c:2440
 __do_sys_sendmsg net/socket.c:2449 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2447
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2447
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441389
Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 1b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff3b02ce98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441389
RDX: 0000000000000000 RSI: 0000000020001500 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402130
R13: 00000000004021c0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:143 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:126
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0x9aa/0x12f0 mm/slub.c:4511
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1094 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1176 [inline]
 netlink_sendmsg+0xdb9/0x1840 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmsg+0x6d1/0x820 net/socket.c:2440
 __do_sys_sendmsg net/socket.c:2449 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2447
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2447
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================

Crashes (37):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/20 23:37 https://github.com/google/kmsan.git master c5a13b33ec11 9564d2e9 .config console log report syz C ci-upstream-kmsan-gce
2020/10/08 10:26 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/08 06:29 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/08 03:30 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 22:39 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 12:56 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 11:45 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 08:42 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 05:44 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 05:01 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 04:27 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 21:53 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 15:27 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 13:25 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 09:31 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 03:25 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/05 23:27 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/05 23:22 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/05 08:20 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce
2020/10/04 20:17 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce
2020/10/04 14:45 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce
2020/10/01 03:58 https://github.com/google/kmsan.git master 5edb1df295b9 8516f6d3 .config console log report info ci-upstream-kmsan-gce
2020/10/01 01:49 https://github.com/google/kmsan.git master 5edb1df295b9 8516f6d3 .config console log report info ci-upstream-kmsan-gce
2020/09/30 06:34 https://github.com/google/kmsan.git master 5edb1df295b9 5abc3f1a .config console log report info ci-upstream-kmsan-gce
2020/09/29 19:18 https://github.com/google/kmsan.git master 5edb1df295b9 1b88c6d5 .config console log report info ci-upstream-kmsan-gce
2020/09/28 03:40 https://github.com/google/kmsan.git master c5a13b33ec11 5dd8aee8 .config console log report info ci-upstream-kmsan-gce
2020/09/27 02:35 https://github.com/google/kmsan.git master c5a13b33ec11 2d5ea0cb .config console log report info ci-upstream-kmsan-gce
2020/09/20 18:43 https://github.com/google/kmsan.git master c5a13b33ec11 9564d2e9 .config console log report info ci-upstream-kmsan-gce
2020/10/07 05:50 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce-386
2020/10/07 05:11 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce-386
2020/10/06 03:32 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce-386
2020/10/05 07:02 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce-386
2020/10/05 03:26 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce-386
2020/10/04 20:17 https://github.com/google/kmsan.git master 5edb1df295b9 5ef9c291 .config console log report info ci-upstream-kmsan-gce-386
2020/09/30 06:38 https://github.com/google/kmsan.git master 5edb1df295b9 5abc3f1a .config console log report info ci-upstream-kmsan-gce-386
2020/09/29 19:15 https://github.com/google/kmsan.git master 5edb1df295b9 1b88c6d5 .config console log report info ci-upstream-kmsan-gce-386
2020/09/27 02:26 https://github.com/google/kmsan.git master c5a13b33ec11 2d5ea0cb .config console log report info ci-upstream-kmsan-gce-386
* Struck through repros no longer work on HEAD.