From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: KMSAN: uninit-value in do_ip_vs_set_ctl Date: Fri, 14 Sep 2018 11:23:04 -0700 Message-ID: <00000000000015a13b0575d8eae8@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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 Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 06b2df0593a8 kmsan: unpoison only the created pages in get.. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=11a6ae37800000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ca1e57bafa8ab1f dashboard link: https://syzkaller.appspot.com/bug?extid=23b5f9e7caf61d9a3898 compiler: clang version 7.0.0 (trunk 329391) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14008417800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11deb017800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+23b5f9e7caf61d9a3898@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 do_ip_vs_set_ctl+0x15ac/0x2760 net/netfilter/ipvs/ip_vs_ctl.c:2424 CPU: 1 PID: 4464 Comm: syz-executor844 Not tainted 4.17.0-rc3+ #94 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 do_ip_vs_set_ctl+0x15ac/0x2760 net/netfilter/ipvs/ip_vs_ctl.c:2424 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 raw_setsockopt+0x2e5/0x350 net/ipv4/raw.c:868 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: 0033:0x43fca9 RSP: 002b:00007fff7a4795b8 EFLAGS: 00000213 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fca9 RDX: 0000000000000480 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004015d0 R13: 0000000000401660 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