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BUG: unable to handle kernel NULL pointer dereference in sk_psock_verdict_data_ready #25

Closed yshigeru closed 4 months ago

yshigeru commented 4 months ago

https://syzkaller.appspot.com/bug?extid=fd7b34375c1c8ce29c93

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 8000000023d8f067 P4D 8000000023d8f067 PUD 7af79067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 5255 Comm: syz-executor278 Not tainted 6.8.0-rc1-syzkaller-00195-g577e4432f3ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000437f8c8 EFLAGS: 00010246
RAX: 1ffff1100482de5c RBX: ffff88802416f2e0 RCX: ffff888023a7bb80
RDX: 0000000000000000 RSI: ffff88802416f000 RDI: ffff888023a96800
RBP: ffffc9000437fad0 R08: ffffffff8957112c R09: 1ffffffff2590c84
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000004 R14: ffffffff89570ff9 R15: ffff888023a96800
FS:  00007f8dfb0eb6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000023dae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sk_psock_verdict_data_ready+0x232/0x340 [net/core/skmsg.c:1230](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/core/skmsg.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n1230)
 unix_stream_sendmsg+0x9b4/0x1230 [net/unix/af_unix.c:2293](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/unix/af_unix.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n2293)
 sock_sendmsg_nosec [net/socket.c:730](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/socket.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n730) [inline]
 __sock_sendmsg+0x221/0x270 [net/socket.c:745](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/socket.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n745)
 ____sys_sendmsg+0x525/0x7d0 [net/socket.c:2584](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/socket.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n2584)
 ___sys_sendmsg [net/socket.c:2638](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/socket.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n2638) [inline]
 __sys_sendmsg+0x2b0/0x3a0 [net/socket.c:2667](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/net/socket.c?id=577e4432f3ac810049cb7e6b71f4d96ec7c6e894#n2667)
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f8dfb16c729
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8dfb0eb218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8dfb1f6368 RCX: 00007f8dfb16c729
RDX: 0000000000040000 RSI: 0000000020000980 RDI: 0000000000000003
RBP: 00007f8dfb1f6360 R08: 00007fff2e940fc7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8dfb1f636c
R13: 00007f8dfb1c3074 R14: 656c6c616b7a7973 R15: 00007fff2e940fc8
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000437f8c8 EFLAGS: 00010246
RAX: 1ffff1100482de5c RBX: ffff88802416f2e0 RCX: ffff888023a7bb80
RDX: 0000000000000000 RSI: ffff88802416f000 RDI: ffff888023a96800
RBP: ffffc9000437fad0 R08: ffffffff8957112c R09: 1ffffffff2590c84
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000004 R14: ffffffff89570ff9 R15: ffff888023a96800
FS:  00007f8dfb0eb6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000023dae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
yshigeru commented 4 months ago

Sent v1 patch: https://lore.kernel.org/all/20240218150933.6004-1-syoshida@redhat.com/

yshigeru commented 4 months ago

Merged on bpf tree: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4cd12c6065df