syzbot


KMSAN: uninit-value in strlcpy (2)

Status: upstream: reported C repro on 2018/09/14 18:23
Reported-by: syzbot+c86cf7903306a6c201ba@syzkaller.appspotmail.com
First crash: 1596d, last: 1484d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in strlcpy C 2 1606d 1606d 6/24 fixed on 2018/05/08 18:30
Patch testing requests:
Created Duration User Patch Repo Result
2022/08/30 17:27 8m https://github.com/google/kmsan.git master error
2020/10/31 23:42 18m anant.thazhemadam@gmail.com https://github.com/google/kmsan.git master OK

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in strlen lib/string.c:482 [inline]
BUG: KMSAN: uninit-value in strlcpy+0x68/0x1c0 lib/string.c:142
CPU: 0 PID: 4506 Comm: syz-executor160 Not tainted 4.17.0-rc5+ #95
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 strlen lib/string.c:482 [inline]
 strlcpy+0x68/0x1c0 lib/string.c:142
 do_ip_vs_set_ctl+0x3f1/0x2760 net/netfilter/ipvs/ip_vs_ctl.c:2384
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x476/0x4d0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt+0x24b/0x2b0 net/ipv4/ip_sockglue.c:1253
 udp_setsockopt+0x108/0x1b0 net/ipv4/udp.c:2416
 ipv6_setsockopt+0x30c/0x340 net/ipv6/ipv6_sockglue.c:917
 tcp_setsockopt+0x1bb/0x1f0 net/ipv4/tcp.c:2891
 sock_common_setsockopt+0x136/0x170 net/core/sock.c:3039
 __sys_setsockopt+0x4af/0x560 net/socket.c:1903
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43fce9
RSP: 002b:00007ffea6b1dd08 EFLAGS: 00000213 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9
RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8
R10: 00000000200001c0 R11: 0000000000000213 R12: 0000000000401610
R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----arg@do_ip_vs_set_ctl
Variable was created at:
 read_pnet include/net/net_namespace.h:288 [inline]
 sock_net include/net/sock.h:2306 [inline]
 do_ip_vs_set_ctl+0x93/0x2760 net/netfilter/ipvs/ip_vs_ctl.c:2347
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x476/0x4d0 net/netfilter/nf_sockopt.c:115
==================================================================

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce 2018/05/16 12:38 https://github.com/google/kmsan.git master 9822946c7fee 75b2448a .config log report syz C
ci-upstream-kmsan-gce 2018/09/05 06:19 https://github.com/google/kmsan.git master 28f0ca98eadf a4718693 .config log report
ci-upstream-kmsan-gce 2018/06/06 18:03 https://github.com/google/kmsan.git master b9a5d319699c 41f9540d .config log report
ci-upstream-kmsan-gce 2018/06/03 21:02 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config log report
ci-upstream-kmsan-gce 2018/05/29 07:24 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config log report
ci-upstream-kmsan-gce 2018/05/16 12:12 https://github.com/google/kmsan.git master 9822946c7fee 75b2448a .config log report
* Struck through repros no longer work on HEAD.