netdev - Re: KMSAN: uninit-value in unix_find

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Date:   Mon, 9 Jul 2018 07:59:54 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+75d51fe5bf4ebe988518@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>,
        David Herrmann <dh.herrmann@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Matthew Dawson <matthew@...systems.ca>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Al Viro <viro@...iv.linux.org.uk>,
        Cong Wang <xiyou.wangcong@...il.com>,
        v9fs-developer@...ts.sourceforge.net,
        Ron Minnich <rminnich@...dia.gov>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>
Subject: Re: KMSAN: uninit-value in unix_find_other

On Mon, Jul 9, 2018 at 7:58 AM, syzbot
<syzbot+75d51fe5bf4ebe988518@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    a00de5aa4da3 kmsan: delete some dead code
> git tree:       https://github.com/google/kmsan.git/master
> console output: https://syzkaller.appspot.com/x/log.txt?x=165aa6d0400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b3fd30f86ca205e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=75d51fe5bf4ebe988518
> compiler:       clang version 7.0.0 (trunk 334104)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=128012c2400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1221462c400000

+9p maintainers, the bug seems to be in 9p

> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+75d51fe5bf4ebe988518@...kaller.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 __unix_find_socket_byname net/unix/af_unix.c:280
> [inline]
> BUG: KMSAN: uninit-value in unix_find_socket_byname net/unix/af_unix.c:303
> [inline]
> BUG: KMSAN: uninit-value in unix_find_other+0x315/0xc60
> net/unix/af_unix.c:932
> CPU: 1 PID: 4574 Comm: syz-executor354 Not tainted 4.17.0+ #22
> 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+0x188/0x2a0 mm/kmsan/kmsan.c:990
>  __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:640
>  __unix_find_socket_byname net/unix/af_unix.c:280 [inline]
>  unix_find_socket_byname net/unix/af_unix.c:303 [inline]
>  unix_find_other+0x315/0xc60 net/unix/af_unix.c:932
>  unix_stream_connect+0x84e/0x26b0 net/unix/af_unix.c:1241
>  p9_fd_create_unix+0x36b/0x5f0 net/9p/trans_fd.c:1019
>  p9_client_create+0x1333/0x20e0 net/9p/client.c:1065
>  v9fs_session_init+0x313/0x2830 fs/9p/v9fs.c:405
>  v9fs_mount+0x107/0x11b0 fs/9p/vfs_super.c:135
>  mount_fs+0x29b/0x780 fs/super.c:1277
>  vfs_kern_mount+0x222/0x990 fs/namespace.c:1037
>  do_new_mount fs/namespace.c:2518 [inline]
>  do_mount+0xca5/0x4ed0 fs/namespace.c:2848
>  ksys_mount+0x32e/0x3d0 fs/namespace.c:3064
>  __do_sys_mount fs/namespace.c:3078 [inline]
>  __se_sys_mount fs/namespace.c:3075 [inline]
>  __x64_sys_mount+0x157/0x1c0 fs/namespace.c:3075
>  do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x63/0xe7
> RIP: 0033:0x4400d9
> RSP: 002b:00007fff30dec578 EFLAGS: 00000217 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004400d9
> RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000020000000
> RBP: 00000000006ca018 R08: 0000000020000100 R09: 00000000004002c8
> R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401960
> R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000
>
> Local variable description: ----sun_server@...fd_create_unix
> Variable was created at:
>  p9_fd_create_unix+0x7a/0x5f0 net/9p/trans_fd.c:996
>  p9_client_create+0x1333/0x20e0 net/9p/client.c:1065
> ==================================================================
>
>
> ---
> 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@...glegroups.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
>
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