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Fri, 14 Sep 2018 11:23:04 -0700 (PDT) Date: Fri, 14 Sep 2018 11:23:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000012463d0575d8eace@google.com> Subject: KMSAN: uninit-value in strlcpy (2) From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, fw@strlen.de, horms@verge.net.au, ja@ssi.bg, kadlec@blackhole.kfki.hu, linux-kernel@vger.kernel.org, lvs-devel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pablo@netfilter.org, syzkaller-bugs@googlegroups.com, wensong@linux-vs.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 9822946c7fee kmsan: update .config.example to v4.17-rc5 git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=169a5197800000 kernel config: https://syzkaller.appspot.com/x/.config?x=9fa436d3ae606638 dashboard link: https://syzkaller.appspot.com/bug?extid=c86cf7903306a6c201ba compiler: clang version 7.0.0 (trunk 329391) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d1b87b800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11235417800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c86cf7903306a6c201ba@syzkaller.appspotmail.com 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 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches