* [syzbot] [net?] WARNING in inet_csk_get_port (2)
@ 2023-09-20 18:02 syzbot
2023-09-20 18:59 ` Kuniyuki Iwashima
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2023-09-20 18:02 UTC (permalink / raw)
To: avagin, davem, dsahern, edumazet, kuba, kuniyu, linux-kernel,
netdev, pabeni, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 2cf0f7156238 Merge tag 'nfs-for-6.6-2' of git://git.linux-..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17405ab0680000
kernel config: https://syzkaller.appspot.com/x/.config?x=d594086f139d167
dashboard link: https://syzkaller.appspot.com/bug?extid=71e724675ba3958edb31
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b2e118680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127b55c4680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/456b02029fa8/disk-2cf0f715.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9f9ff0c00454/vmlinux-2cf0f715.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0ede19fba30f/bzImage-2cf0f715.xz
The issue was bisected to:
commit c48ef9c4aed3632566b57ba66cec6ec78624d4cb
Author: Kuniyuki Iwashima <kuniyu@amazon.com>
Date: Mon Sep 11 18:36:57 2023 +0000
tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15567dc4680000
final oops: https://syzkaller.appspot.com/x/report.txt?x=17567dc4680000
console output: https://syzkaller.appspot.com/x/log.txt?x=13567dc4680000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com
Fixes: c48ef9c4aed3 ("tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.")
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5049 at net/ipv4/inet_connection_sock.c:587 inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
Modules linked in:
CPU: 0 PID: 5049 Comm: syz-executor288 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
Code: 7c 24 08 e8 4c b6 8a 01 31 d2 be 88 01 00 00 48 c7 c7 e0 94 ae 8b e8 59 2e a3 f8 2e 2e 2e 31 c0 e9 04 fe ff ff e8 ca 88 d0 f8 <0f> 0b e9 0f f9 ff ff e8 be 88 d0 f8 49 8d 7e 48 e8 65 ca 5a 00 31
RSP: 0018:ffffc90003abfbf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888026429100 RCX: 0000000000000000
RDX: ffff88807edcbb80 RSI: ffffffff88b73d66 RDI: ffff888026c49f38
RBP: ffff888026c49f30 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff9260f200
R13: ffff888026c49880 R14: 0000000000000000 R15: ffff888026429100
FS: 00005555557d5380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ad50 CR3: 0000000025754000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
inet_csk_listen_start+0x155/0x360 net/ipv4/inet_connection_sock.c:1256
__inet_listen_sk+0x1b8/0x5c0 net/ipv4/af_inet.c:217
inet_listen+0x93/0xd0 net/ipv4/af_inet.c:239
__sys_listen+0x194/0x270 net/socket.c:1866
__do_sys_listen net/socket.c:1875 [inline]
__se_sys_listen net/socket.c:1873 [inline]
__x64_sys_listen+0x53/0x80 net/socket.c:1873
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3a5bce3af9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc1a1c79e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a5bce3af9
RDX: 00007f3a5bce3af9 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f3a5bd565f0 R08: 0000000000000006 R09: 0000000000000006
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
</TASK>
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [net?] WARNING in inet_csk_get_port (2)
2023-09-20 18:02 [syzbot] [net?] WARNING in inet_csk_get_port (2) syzbot
@ 2023-09-20 18:59 ` Kuniyuki Iwashima
2023-11-08 16:11 ` David Wei
0 siblings, 1 reply; 4+ messages in thread
From: Kuniyuki Iwashima @ 2023-09-20 18:59 UTC (permalink / raw)
To: syzbot+71e724675ba3958edb31
Cc: avagin, davem, dsahern, edumazet, kuba, kuniyu, linux-kernel,
netdev, pabeni, syzkaller-bugs
From: syzbot <syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com>
Date: Wed, 20 Sep 2023 11:02:55 -0700
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 2cf0f7156238 Merge tag 'nfs-for-6.6-2' of git://git.linux-..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17405ab0680000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d594086f139d167
> dashboard link: https://syzkaller.appspot.com/bug?extid=71e724675ba3958edb31
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b2e118680000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127b55c4680000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/456b02029fa8/disk-2cf0f715.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/9f9ff0c00454/vmlinux-2cf0f715.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/0ede19fba30f/bzImage-2cf0f715.xz
>
> The issue was bisected to:
>
> commit c48ef9c4aed3632566b57ba66cec6ec78624d4cb
> Author: Kuniyuki Iwashima <kuniyu@amazon.com>
> Date: Mon Sep 11 18:36:57 2023 +0000
>
> tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.
>
We need this condition to put v4 sk and v4-mapped-v6 sk into
the same bucket.
---8<---
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index dfb1c61c0c2b..6487357d1ddd 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -822,7 +823,8 @@ static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
return ipv6_addr_v4mapped(&tb->v6_rcv_saddr) &&
tb->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
- return false;
+ return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
+ sk->sk_v6_rcv_saddr.s6_addr32[3] == tb->rcv_saddr;
}
if (sk->sk_family == AF_INET6)
---8<---
Scenario is like
1) bind(v4) creates a tb2 bucket
2) bind(v4-mapped-v6) creates another tb2 bucket
3) listen(v4) finds the second tb2 and trigger warning
---8<---
from socket import *
s = socket()
s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
s.bind(('255.255.255.255', 0))
s2 = socket(AF_INET6, SOCK_STREAM)
s2.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
s2.bind(('::ffff:255.255.255.255', s.getsockname()[1]))
s.listen()
---8<---
Will post a formal patch after doing more tests with SO_REUSEPORT.
Thanks!
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15567dc4680000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=17567dc4680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=13567dc4680000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com
> Fixes: c48ef9c4aed3 ("tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.")
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5049 at net/ipv4/inet_connection_sock.c:587 inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
> Modules linked in:
> CPU: 0 PID: 5049 Comm: syz-executor288 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
> RIP: 0010:inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
> Code: 7c 24 08 e8 4c b6 8a 01 31 d2 be 88 01 00 00 48 c7 c7 e0 94 ae 8b e8 59 2e a3 f8 2e 2e 2e 31 c0 e9 04 fe ff ff e8 ca 88 d0 f8 <0f> 0b e9 0f f9 ff ff e8 be 88 d0 f8 49 8d 7e 48 e8 65 ca 5a 00 31
> RSP: 0018:ffffc90003abfbf0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff888026429100 RCX: 0000000000000000
> RDX: ffff88807edcbb80 RSI: ffffffff88b73d66 RDI: ffff888026c49f38
> RBP: ffff888026c49f30 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff9260f200
> R13: ffff888026c49880 R14: 0000000000000000 R15: ffff888026429100
> FS: 00005555557d5380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000000045ad50 CR3: 0000000025754000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> inet_csk_listen_start+0x155/0x360 net/ipv4/inet_connection_sock.c:1256
> __inet_listen_sk+0x1b8/0x5c0 net/ipv4/af_inet.c:217
> inet_listen+0x93/0xd0 net/ipv4/af_inet.c:239
> __sys_listen+0x194/0x270 net/socket.c:1866
> __do_sys_listen net/socket.c:1875 [inline]
> __se_sys_listen net/socket.c:1873 [inline]
> __x64_sys_listen+0x53/0x80 net/socket.c:1873
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f3a5bce3af9
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffc1a1c79e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a5bce3af9
> RDX: 00007f3a5bce3af9 RSI: 0000000000000000 RDI: 0000000000000003
> RBP: 00007f3a5bd565f0 R08: 0000000000000006 R09: 0000000000000006
> R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001
> R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
> </TASK>
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [syzbot] [net?] WARNING in inet_csk_get_port (2)
2023-09-20 18:59 ` Kuniyuki Iwashima
@ 2023-11-08 16:11 ` David Wei
2023-11-08 17:45 ` Kuniyuki Iwashima
0 siblings, 1 reply; 4+ messages in thread
From: David Wei @ 2023-11-08 16:11 UTC (permalink / raw)
To: Kuniyuki Iwashima, syzbot+71e724675ba3958edb31
Cc: avagin, davem, dsahern, edumazet, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs
On 2023-09-20 11:59, Kuniyuki Iwashima wrote:
> From: syzbot <syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com>
> Date: Wed, 20 Sep 2023 11:02:55 -0700
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: 2cf0f7156238 Merge tag 'nfs-for-6.6-2' of git://git.linux-..
>> git tree: upstream
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17405ab0680000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=d594086f139d167
>> dashboard link: https://syzkaller.appspot.com/bug?extid=71e724675ba3958edb31
>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b2e118680000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127b55c4680000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/456b02029fa8/disk-2cf0f715.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/9f9ff0c00454/vmlinux-2cf0f715.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/0ede19fba30f/bzImage-2cf0f715.xz
>>
>> The issue was bisected to:
>>
>> commit c48ef9c4aed3632566b57ba66cec6ec78624d4cb
>> Author: Kuniyuki Iwashima <kuniyu@amazon.com>
>> Date: Mon Sep 11 18:36:57 2023 +0000
>>
>> tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.
>>
>
> We need this condition to put v4 sk and v4-mapped-v6 sk into
> the same bucket.
>
> ---8<---
> diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
> index dfb1c61c0c2b..6487357d1ddd 100644
> --- a/net/ipv4/inet_hashtables.c
> +++ b/net/ipv4/inet_hashtables.c
> @@ -822,7 +823,8 @@ static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
> return ipv6_addr_v4mapped(&tb->v6_rcv_saddr) &&
> tb->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
>
> - return false;
> + return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
> + sk->sk_v6_rcv_saddr.s6_addr32[3] == tb->rcv_saddr;
> }
>
> if (sk->sk_family == AF_INET6)
> ---8<---
>
> Scenario is like
>
> 1) bind(v4) creates a tb2 bucket
> 2) bind(v4-mapped-v6) creates another tb2 bucket
> 3) listen(v4) finds the second tb2 and trigger warning
>
> ---8<---
> from socket import *
>
> s = socket()
> s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
> s.bind(('255.255.255.255', 0))
>
> s2 = socket(AF_INET6, SOCK_STREAM)
> s2.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
> s2.bind(('::ffff:255.255.255.255', s.getsockname()[1]))
> s.listen()
> ---8<---
>
> Will post a formal patch after doing more tests with SO_REUSEPORT.
>
> Thanks!
Hi Kuniyuki, did you get around to fixing and posting this patch? I
couldn't find anything on the mailing list.
Would you like help fixing this?
>
>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15567dc4680000
>> final oops: https://syzkaller.appspot.com/x/report.txt?x=17567dc4680000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=13567dc4680000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com
>> Fixes: c48ef9c4aed3 ("tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.")
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 0 PID: 5049 at net/ipv4/inet_connection_sock.c:587 inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
>> Modules linked in:
>> CPU: 0 PID: 5049 Comm: syz-executor288 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
>> RIP: 0010:inet_csk_get_port+0xf96/0x2350 net/ipv4/inet_connection_sock.c:587
>> Code: 7c 24 08 e8 4c b6 8a 01 31 d2 be 88 01 00 00 48 c7 c7 e0 94 ae 8b e8 59 2e a3 f8 2e 2e 2e 31 c0 e9 04 fe ff ff e8 ca 88 d0 f8 <0f> 0b e9 0f f9 ff ff e8 be 88 d0 f8 49 8d 7e 48 e8 65 ca 5a 00 31
>> RSP: 0018:ffffc90003abfbf0 EFLAGS: 00010293
>> RAX: 0000000000000000 RBX: ffff888026429100 RCX: 0000000000000000
>> RDX: ffff88807edcbb80 RSI: ffffffff88b73d66 RDI: ffff888026c49f38
>> RBP: ffff888026c49f30 R08: 0000000000000005 R09: 0000000000000000
>> R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff9260f200
>> R13: ffff888026c49880 R14: 0000000000000000 R15: ffff888026429100
>> FS: 00005555557d5380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 000000000045ad50 CR3: 0000000025754000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <TASK>
>> inet_csk_listen_start+0x155/0x360 net/ipv4/inet_connection_sock.c:1256
>> __inet_listen_sk+0x1b8/0x5c0 net/ipv4/af_inet.c:217
>> inet_listen+0x93/0xd0 net/ipv4/af_inet.c:239
>> __sys_listen+0x194/0x270 net/socket.c:1866
>> __do_sys_listen net/socket.c:1875 [inline]
>> __se_sys_listen net/socket.c:1873 [inline]
>> __x64_sys_listen+0x53/0x80 net/socket.c:1873
>> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
>> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> RIP: 0033:0x7f3a5bce3af9
>> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
>> RSP: 002b:00007ffc1a1c79e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
>> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a5bce3af9
>> RDX: 00007f3a5bce3af9 RSI: 0000000000000000 RDI: 0000000000000003
>> RBP: 00007f3a5bd565f0 R08: 0000000000000006 R09: 0000000000000006
>> R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001
>> R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
>> </TASK>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [net?] WARNING in inet_csk_get_port (2)
2023-11-08 16:11 ` David Wei
@ 2023-11-08 17:45 ` Kuniyuki Iwashima
0 siblings, 0 replies; 4+ messages in thread
From: Kuniyuki Iwashima @ 2023-11-08 17:45 UTC (permalink / raw)
To: dw
Cc: avagin, davem, dsahern, edumazet, kuba, kuniyu, linux-kernel,
netdev, pabeni, syzbot+71e724675ba3958edb31, syzkaller-bugs
From: David Wei <dw@davidwei.uk>
Date: Wed, 8 Nov 2023 08:11:56 -0800
> On 2023-09-20 11:59, Kuniyuki Iwashima wrote:
> > From: syzbot <syzbot+71e724675ba3958edb31@syzkaller.appspotmail.com>
> > Date: Wed, 20 Sep 2023 11:02:55 -0700
> >> Hello,
> >>
> >> syzbot found the following issue on:
> >>
> >> HEAD commit: 2cf0f7156238 Merge tag 'nfs-for-6.6-2' of git://git.linux-..
> >> git tree: upstream
> >> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17405ab0680000
> >> kernel config: https://syzkaller.appspot.com/x/.config?x=d594086f139d167
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=71e724675ba3958edb31
> >> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b2e118680000
> >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127b55c4680000
> >>
> >> Downloadable assets:
> >> disk image: https://storage.googleapis.com/syzbot-assets/456b02029fa8/disk-2cf0f715.raw.xz
> >> vmlinux: https://storage.googleapis.com/syzbot-assets/9f9ff0c00454/vmlinux-2cf0f715.xz
> >> kernel image: https://storage.googleapis.com/syzbot-assets/0ede19fba30f/bzImage-2cf0f715.xz
> >>
> >> The issue was bisected to:
> >>
> >> commit c48ef9c4aed3632566b57ba66cec6ec78624d4cb
> >> Author: Kuniyuki Iwashima <kuniyu@amazon.com>
> >> Date: Mon Sep 11 18:36:57 2023 +0000
> >>
> >> tcp: Fix bind() regression for v4-mapped-v6 non-wildcard address.
> >>
> >
> > We need this condition to put v4 sk and v4-mapped-v6 sk into
> > the same bucket.
> >
> > ---8<---
> > diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
> > index dfb1c61c0c2b..6487357d1ddd 100644
> > --- a/net/ipv4/inet_hashtables.c
> > +++ b/net/ipv4/inet_hashtables.c
> > @@ -822,7 +823,8 @@ static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
> > return ipv6_addr_v4mapped(&tb->v6_rcv_saddr) &&
> > tb->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
> >
> > - return false;
> > + return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
> > + sk->sk_v6_rcv_saddr.s6_addr32[3] == tb->rcv_saddr;
> > }
> >
> > if (sk->sk_family == AF_INET6)
> > ---8<---
> >
> > Scenario is like
> >
> > 1) bind(v4) creates a tb2 bucket
> > 2) bind(v4-mapped-v6) creates another tb2 bucket
> > 3) listen(v4) finds the second tb2 and trigger warning
> >
> > ---8<---
> > from socket import *
> >
> > s = socket()
> > s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
> > s.bind(('255.255.255.255', 0))
> >
> > s2 = socket(AF_INET6, SOCK_STREAM)
> > s2.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
> > s2.bind(('::ffff:255.255.255.255', s.getsockname()[1]))
> > s.listen()
> > ---8<---
> >
> > Will post a formal patch after doing more tests with SO_REUSEPORT.
> >
> > Thanks!
>
> Hi Kuniyuki, did you get around to fixing and posting this patch? I
> couldn't find anything on the mailing list.
>
> Would you like help fixing this?
Hi,
It's fixed by this patch.
https://lore.kernel.org/netdev/20231010013814.70571-1-kuniyu@amazon.com/
Thanks
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-11-08 17:45 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-09-20 18:02 [syzbot] [net?] WARNING in inet_csk_get_port (2) syzbot
2023-09-20 18:59 ` Kuniyuki Iwashima
2023-11-08 16:11 ` David Wei
2023-11-08 17:45 ` Kuniyuki Iwashima
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