Hello,
syzbot found the following crash on:
HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN wrappers from a..
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
dashboard link: https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
compiler: clang version 8.0.0 (trunk 348261)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
Started in network mode
Own node identity fe8000000000000000000000000000bb, cluster identity 4711
==================================================================
BUG: KMSAN: uninit-value in __inet6_bind+0xb72/0x1ad0
net/ipv6/af_inet6.c:340
CPU: 0 PID: 8376 Comm: syz-executor3 Not tainted 4.20.0-rc5+ #111
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+0x284/0x3b0 lib/dump_stack.c:113
kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:684
__msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
__inet6_bind+0xb72/0x1ad0 net/ipv6/af_inet6.c:340
inet6_bind+0x27f/0x390 net/ipv6/af_inet6.c:441
kernel_bind+0xc6/0xf0 net/socket.c:3230
udp_sock_create6+0x2ee/0x890 net/ipv6/ip6_udp_tunnel.c:39
udp_sock_create include/net/udp_tunnel.h:61 [inline]
tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
tipc_enable_bearer net/tipc/bearer.c:302 [inline]
__tipc_nl_bearer_enable+0x1213/0x1da0 net/tipc/bearer.c:897
tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:905
genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477
genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0xfc5/0x10a0 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x1298/0x13e0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xdbc/0x11d0 net/socket.c:2116
__sys_sendmsg net/socket.c:2154 [inline]
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg+0x305/0x460 net/socket.c:2161
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457659
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f82ebc52c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457659
RDX: 0000000000000000 RSI: 00000000200008c0 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82ebc536d4
R13: 00000000004c421b R14: 00000000004d7160 R15: 00000000ffffffff
Local variable description: ----udp6_addr@udp_sock_create6
Variable was created at:
udp_sock_create6+0x80/0x890 net/ipv6/ip6_udp_tunnel.c:17
udp_sock_create include/net/udp_tunnel.h:61 [inline]
tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
==================================================================
---
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 [email protected].
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
On Tue, Dec 11, 2018 at 1:41 AM syzbot
<[email protected]> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN wrappers from a..
> git tree: https://github.com/google/kmsan.git/master
> console output: https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
> dashboard link: https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
> compiler: clang version 8.0.0 (trunk 348261)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
This looks like a bug in TIPC, +TIPC maintainers.
> Started in network mode
> Own node identity fe8000000000000000000000000000bb, cluster identity 4711
> ==================================================================
> BUG: KMSAN: uninit-value in __inet6_bind+0xb72/0x1ad0
> net/ipv6/af_inet6.c:340
> CPU: 0 PID: 8376 Comm: syz-executor3 Not tainted 4.20.0-rc5+ #111
> 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+0x284/0x3b0 lib/dump_stack.c:113
> kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:684
> __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
> __inet6_bind+0xb72/0x1ad0 net/ipv6/af_inet6.c:340
> inet6_bind+0x27f/0x390 net/ipv6/af_inet6.c:441
> kernel_bind+0xc6/0xf0 net/socket.c:3230
> udp_sock_create6+0x2ee/0x890 net/ipv6/ip6_udp_tunnel.c:39
> udp_sock_create include/net/udp_tunnel.h:61 [inline]
> tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
> tipc_enable_bearer net/tipc/bearer.c:302 [inline]
> __tipc_nl_bearer_enable+0x1213/0x1da0 net/tipc/bearer.c:897
> tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:905
> genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
> genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
> netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477
> genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
> netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
> netlink_unicast+0xfc5/0x10a0 net/netlink/af_netlink.c:1336
> netlink_sendmsg+0x1298/0x13e0 net/netlink/af_netlink.c:1917
> sock_sendmsg_nosec net/socket.c:621 [inline]
> sock_sendmsg net/socket.c:631 [inline]
> ___sys_sendmsg+0xdbc/0x11d0 net/socket.c:2116
> __sys_sendmsg net/socket.c:2154 [inline]
> __do_sys_sendmsg net/socket.c:2163 [inline]
> __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
> __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
> do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
> entry_SYSCALL_64_after_hwframe+0x63/0xe7
> RIP: 0033:0x457659
> Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007f82ebc52c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457659
> RDX: 0000000000000000 RSI: 00000000200008c0 RDI: 0000000000000003
> RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82ebc536d4
> R13: 00000000004c421b R14: 00000000004d7160 R15: 00000000ffffffff
>
> Local variable description: ----udp6_addr@udp_sock_create6
> Variable was created at:
> udp_sock_create6+0x80/0x890 net/ipv6/ip6_udp_tunnel.c:17
> udp_sock_create include/net/udp_tunnel.h:61 [inline]
> tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
> ==================================================================
>
>
> ---
> 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 [email protected].
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
>
> --
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> To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
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> For more options, visit https://groups.google.com/d/optout.
On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <[email protected]> wrote:
>
> On Tue, Dec 11, 2018 at 1:41 AM syzbot
> <[email protected]> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN wrappers from a..
> > git tree: https://github.com/google/kmsan.git/master
> > console output: https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
> > dashboard link: https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
> > compiler: clang version 8.0.0 (trunk 348261)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
>
> This looks like a bug in TIPC, +TIPC maintainers.
>
It looks more like udp_sock_create6() doesn't initialize
udp6_addr.sin6_scope_id.
> -----Original Message-----
> From: Cong Wang <[email protected]>
> Sent: 12-Dec-18 01:17
> To: Dmitry Vyukov <[email protected]>
> Cc: [email protected]; Jon Maloy
> <[email protected]>; Ying Xue <[email protected]>; tipc-
> [email protected]; David Miller <[email protected]>;
> Alexey Kuznetsov <[email protected]>; LKML <linux-
> [email protected]>; Linux Kernel Network Developers
> <[email protected]>; [email protected]; Hideaki
> YOSHIFUJI <[email protected]>
> Subject: Re: KMSAN: uninit-value in __inet6_bind
>
> On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <[email protected]>
> wrote:
> >
> > On Tue, Dec 11, 2018 at 1:41 AM syzbot
> > <[email protected]> wrote:
> > >
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN
> wrappers from a..
> > > git tree: https://github.com/google/kmsan.git/master
> > > console output:
> > > https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
> > > kernel config:
> > > https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
> > > dashboard link:
> https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
> > > compiler: clang version 8.0.0 (trunk 348261)
> > >
> > > Unfortunately, I don't have any reproducer for this crash yet.
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the
> commit:
> > > Reported-by: [email protected]
> >
> > This looks like a bug in TIPC, +TIPC maintainers.
> >
>
> It looks more like udp_sock_create6() doesn't initialize
> udp6_addr.sin6_scope_id.
Unfortunately udp_sock_create6() has no way of knowing this value, because struct udp_port_cfg is missing a field sin6_scope_id.
So this has to be fixed first by adding this field to the struct, and then setting it correctly in all current users.
///jon
On 12/14/2018 07:04 AM, Jon Maloy wrote:
>
>
>> -----Original Message-----
>> From: Cong Wang <[email protected]>
>> Sent: 12-Dec-18 01:17
>> To: Dmitry Vyukov <[email protected]>
>> Cc: [email protected]; Jon Maloy
>> <[email protected]>; Ying Xue <[email protected]>; tipc-
>> [email protected]; David Miller <[email protected]>;
>> Alexey Kuznetsov <[email protected]>; LKML <linux-
>> [email protected]>; Linux Kernel Network Developers
>> <[email protected]>; [email protected]; Hideaki
>> YOSHIFUJI <[email protected]>
>> Subject: Re: KMSAN: uninit-value in __inet6_bind
>>
>> On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <[email protected]>
>> wrote:
>>>
>>> On Tue, Dec 11, 2018 at 1:41 AM syzbot
>>> <[email protected]> wrote:
>>>>
>>>> Hello,
>>>>
>>>> syzbot found the following crash on:
>>>>
>>>> HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN
>> wrappers from a..
>>>> git tree: https://github.com/google/kmsan.git/master
>>>> console output:
>>>> https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
>>>> kernel config:
>>>> https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
>>>> dashboard link:
>> https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
>>>> compiler: clang version 8.0.0 (trunk 348261)
>>>>
>>>> Unfortunately, I don't have any reproducer for this crash yet.
>>>>
>>>> IMPORTANT: if you fix the bug, please add the following tag to the
>> commit:
>>>> Reported-by: [email protected]
>>>
>>> This looks like a bug in TIPC, +TIPC maintainers.
>>>
>>
>> It looks more like udp_sock_create6() doesn't initialize
>> udp6_addr.sin6_scope_id.
>
> Unfortunately udp_sock_create6() has no way of knowing this value, because struct udp_port_cfg is missing a field sin6_scope_id.
> So this has to be fixed first by adding this field to the struct, and then setting it correctly in all current users.
>
Do we reasons to believe values other than 0 are needed ?
> -----Original Message-----
> From: [email protected] <[email protected]>
> On Behalf Of Eric Dumazet
> Sent: 14-Dec-18 10:15
> To: Jon Maloy <[email protected]>; Cong Wang
> <[email protected]>; Dmitry Vyukov <[email protected]>
> Cc: [email protected]; Ying Xue
> <[email protected]>; [email protected]; David
> Miller <[email protected]>; Alexey Kuznetsov <[email protected]>;
> LKML <[email protected]>; Linux Kernel Network Developers
> <[email protected]>; [email protected]; Hideaki
> YOSHIFUJI <[email protected]>
> Subject: Re: KMSAN: uninit-value in __inet6_bind
>
>
>
> On 12/14/2018 07:04 AM, Jon Maloy wrote:
> >
> >
> >> -----Original Message-----
> >> From: Cong Wang <[email protected]>
> >> Sent: 12-Dec-18 01:17
> >> To: Dmitry Vyukov <[email protected]>
> >> Cc: [email protected]; Jon
> Maloy
> >> <[email protected]>; Ying Xue <[email protected]>; tipc-
> >> [email protected]; David Miller <[email protected]>;
> >> Alexey Kuznetsov <[email protected]>; LKML <linux-
> >> [email protected]>; Linux Kernel Network Developers
> >> <[email protected]>; [email protected]; Hideaki
> >> YOSHIFUJI <[email protected]>
> >> Subject: Re: KMSAN: uninit-value in __inet6_bind
> >>
> >> On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <[email protected]>
> >> wrote:
> >>>
> >>> On Tue, Dec 11, 2018 at 1:41 AM syzbot
> >>> <[email protected]> wrote:
> >>>>
> >>>> Hello,
> >>>>
> >>>> syzbot found the following crash on:
> >>>>
> >>>> HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN
> >> wrappers from a..
> >>>> git tree: https://github.com/google/kmsan.git/master
> >>>> console output:
> >>>> https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000
> >>>> kernel config:
> >>>> https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
> >>>> dashboard link:
> >> https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
> >>>> compiler: clang version 8.0.0 (trunk 348261)
> >>>>
> >>>> Unfortunately, I don't have any reproducer for this crash yet.
> >>>>
> >>>> IMPORTANT: if you fix the bug, please add the following tag to the
> >> commit:
> >>>> Reported-by:
> [email protected]
> >>>
> >>> This looks like a bug in TIPC, +TIPC maintainers.
> >>>
> >>
> >> It looks more like udp_sock_create6() doesn't initialize
> >> udp6_addr.sin6_scope_id.
> >
> > Unfortunately udp_sock_create6() has no way of knowing this value,
> because struct udp_port_cfg is missing a field sin6_scope_id.
> > So this has to be fixed first by adding this field to the struct, and then
> setting it correctly in all current users.
> >
>
> Do we reasons to believe values other than 0 are needed ?
>
For TIPC it is ok with 0.
///jon
syzbot has found a reproducer for the following crash on:
HEAD commit: 0a602458c72c kmsan: random: another take at unpoisoning CR..
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=129e1035400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641
dashboard link: https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30
compiler: clang version 8.0.0 (trunk 348261)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a97b2b400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108ec72b400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
audit: type=1800 audit(1545030606.944:30): pid=6407 uid=0 auid=4294967295
ses=4294967295 subj==unconfined op=collect_data cause=failed(directio)
comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0
Started in network mode
Own node identity fe8000000000000000000000000000bb, cluster identity 4711
==================================================================
BUG: KMSAN: uninit-value in __inet6_bind+0xb35/0x1a30
net/ipv6/af_inet6.c:340
CPU: 1 PID: 6557 Comm: syz-executor447 Not tainted 4.20.0-rc5+ #2
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+0x1c9/0x220 lib/dump_stack.c:113
kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:682
__msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
__inet6_bind+0xb35/0x1a30 net/ipv6/af_inet6.c:340
inet6_bind+0x206/0x300 net/ipv6/af_inet6.c:441
kernel_bind+0xc6/0xf0 net/socket.c:3230
udp_sock_create6+0x2ee/0x890 net/ipv6/ip6_udp_tunnel.c:39
udp_sock_create include/net/udp_tunnel.h:61 [inline]
tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
tipc_enable_bearer net/tipc/bearer.c:302 [inline]
__tipc_nl_bearer_enable+0x1213/0x1da0 net/tipc/bearer.c:897
tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:905
genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477
genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0xf80/0x1060 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x129d/0x1310 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xdbc/0x11d0 net/socket.c:2116
__sys_sendmsg net/socket.c:2154 [inline]
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg+0x305/0x460 net/socket.c:2161
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x444199
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe96b1eb28 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444199
RDX: 0000000000000000 RSI: 00000000200008c0 RDI: 0000000000000003
RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401e40
R13: 0000000000401ed0 R14: 0000000000000000 R15: 0000000000000000
Local variable description: ----udp6_addr@udp_sock_create6
Variable was created at:
udp_sock_create6+0x80/0x890 net/ipv6/ip6_udp_tunnel.c:17
udp_sock_create include/net/udp_tunnel.h:61 [inline]
tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742
==================================================================