[syzbot] [bluetooth?] general protection fault in l2cap_publish_rx_avail
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syzbot
Jun 17, 2024, 4:36:24 PM (9 days ago) Jun 17
to johan....@gmail.com, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, luiz....@gmail.com, mar...@holtmann.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1154f6da980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c40c1cd990d2/vmlinux-2ccbdf43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2a94050804e/bzImage-2ccbdf43.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49092d...@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177]
CPU: 0 PID: 5233 Comm: kworker/u33:3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci2 hci_rx_work
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc90003967978 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888025e47000 RCX: ffffc90021bc3000
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff93943408 R12: ffff888025e42000
R13: ffff8880285b72c0 R14: ffff888025e4702e R15: ffff8880285b72c0
FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32345000 CR3: 0000000029c30000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
l2cap_sock_recv_cb+0x104/0x3d0 net/bluetooth/l2cap_sock.c:1509
l2cap_conless_channel net/bluetooth/l2cap_core.c:6780 [inline]
l2cap_recv_frame+0x20cb/0xa190 net/bluetooth/l2cap_core.c:6833
l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7516
hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline]
hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc90003967978 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888025e47000 RCX: ffffc90021bc3000
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff93943408 R12: ffff888025e42000
R13: ffff8880285b72c0 R14: ffff888025e4702e R15: ffff8880285b72c0
FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32345000 CR3: 0000000045a0a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 86 01 00 00 48 test %eax,0x48000001(%rsi)
c: 8b ab a0 04 00 00 mov 0x4a0(%rbx),%ebp
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bd 74 01 00 00 lea 0x174(%rbp),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 3a test %edi,(%rdx)
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1154f6da980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c40c1cd990d2/vmlinux-2ccbdf43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2a94050804e/bzImage-2ccbdf43.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49092d...@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177]
CPU: 0 PID: 5233 Comm: kworker/u33:3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci2 hci_rx_work
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc90003967978 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888025e47000 RCX: ffffc90021bc3000
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff93943408 R12: ffff888025e42000
R13: ffff8880285b72c0 R14: ffff888025e4702e R15: ffff8880285b72c0
FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32345000 CR3: 0000000029c30000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
l2cap_sock_recv_cb+0x104/0x3d0 net/bluetooth/l2cap_sock.c:1509
l2cap_conless_channel net/bluetooth/l2cap_core.c:6780 [inline]
l2cap_recv_frame+0x20cb/0xa190 net/bluetooth/l2cap_core.c:6833
l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7516
hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline]
hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc90003967978 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888025e47000 RCX: ffffc90021bc3000
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff93943408 R12: ffff888025e42000
R13: ffff8880285b72c0 R14: ffff888025e4702e R15: ffff8880285b72c0
FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32345000 CR3: 0000000045a0a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 86 01 00 00 48 test %eax,0x48000001(%rsi)
c: 8b ab a0 04 00 00 mov 0x4a0(%rbx),%ebp
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bd 74 01 00 00 lea 0x174(%rbp),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 3a test %edi,(%rdx)
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Jun 17, 2024, 5:22:19 PM (9 days ago) Jun 17
to johan....@gmail.com, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, luiz....@gmail.com, mar...@holtmann.org, syzkall...@googlegroups.com
syzbot has found a reproducer for the following issue on:
console output: https://syzkaller.appspot.com/x/log.txt?x=175822fa980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b077ee980000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c40c1cd990d2/vmlinux-2ccbdf43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2a94050804e/bzImage-2ccbdf43.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49092d...@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177]
CPU: 0 PID: 5191 Comm: kworker/u33:2 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d
R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0
RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d
R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0
FS: 0000000000000000(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
console output: https://syzkaller.appspot.com/x/log.txt?x=175822fa980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
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=164f8251980000
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b077ee980000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c40c1cd990d2/vmlinux-2ccbdf43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2a94050804e/bzImage-2ccbdf43.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49092d...@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177]
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci0 hci_rx_work
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc900032d7978 EFLAGS: 00010207
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: ffff88802a114000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0
FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555926f16c8 CR3: 0000000022a3c000 CR4: 0000000000350ef0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
l2cap_sock_recv_cb+0x104/0x3d0 net/bluetooth/l2cap_sock.c:1509
l2cap_conless_channel net/bluetooth/l2cap_core.c:6780 [inline]
l2cap_recv_frame+0x20cb/0xa190 net/bluetooth/l2cap_core.c:6833
l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7516
hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline]
hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RSP: 0018:ffffc900032d7978 EFLAGS: 00010207
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
l2cap_sock_recv_cb+0x104/0x3d0 net/bluetooth/l2cap_sock.c:1509
l2cap_conless_channel net/bluetooth/l2cap_core.c:6780 [inline]
l2cap_recv_frame+0x20cb/0xa190 net/bluetooth/l2cap_core.c:6833
l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7516
hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline]
hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137
Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a
RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d
RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: ffff88802a114000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0
FS: 0000000000000000(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f51d7775348 CR3: 000000000d97a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 86 01 00 00 48 test %eax,0x48000001(%rsi)
c: 8b ab a0 04 00 00 mov 0x4a0(%rbx),%ebp
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bd 74 01 00 00 lea 0x174(%rbp),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 3a test %edi,(%rdx)
---
If you want syzbot to run the reproducer, reply with:
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 86 01 00 00 48 test %eax,0x48000001(%rsi)
c: 8b ab a0 04 00 00 mov 0x4a0(%rbx),%ebp
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bd 74 01 00 00 lea 0x174(%rbp),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 3a test %edi,(%rdx)
---
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
Hillf Danton
Jun 18, 2024, 6:45:57 AM (8 days ago) Jun 18
to syzbot, linux-...@vger.kernel.org, syzkall...@googlegroups.com
On Mon, 17 Jun 2024 14:22:17 -0700
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ccbdf43d5e7
diff -pur c/include/net/bluetooth/l2cap.h d/include/net/bluetooth/l2cap.h
--- c/include/net/bluetooth/l2cap.h 2024-06-17 18:33:27.096664300 +0800
+++ d/include/net/bluetooth/l2cap.h 2024-06-17 18:34:47.465834700 +0800
@@ -612,6 +612,7 @@ struct l2cap_chan {
void *data;
const struct l2cap_ops *ops;
struct mutex lock;
+ unsigned int closed;
};
struct l2cap_ops {
diff -pur c/net/bluetooth/l2cap_core.c d/net/bluetooth/l2cap_core.c
--- c/net/bluetooth/l2cap_core.c 2024-06-17 18:32:21.249083200 +0800
+++ d/net/bluetooth/l2cap_core.c 2024-06-17 18:35:47.981139900 +0800
@@ -812,6 +812,7 @@ void l2cap_chan_close(struct l2cap_chan
{
struct l2cap_conn *conn = chan->conn;
+ chan->closed++;
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
switch (chan->state) {
diff -pur c/net/bluetooth/l2cap_sock.c d/net/bluetooth/l2cap_sock.c
--- c/net/bluetooth/l2cap_sock.c 2024-06-17 18:31:43.431535400 +0800
+++ d/net/bluetooth/l2cap_sock.c 2024-06-17 18:41:00.785238900 +0800
@@ -1482,10 +1482,17 @@ static struct l2cap_chan *l2cap_sock_new
static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
{
struct sock *sk = chan->data;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct l2cap_pinfo *pi;
int err;
+ l2cap_chan_lock(chan);
+ if (chan->closed) {
+ l2cap_chan_unlock(chan);
+ return -ENOMEM;
+ }
lock_sock(sk);
+ pi = l2cap_pi(sk);
+ l2cap_chan_unlock(chan);
if (chan->mode == L2CAP_MODE_ERTM && !list_empty(&pi->rx_busy)) {
err = -ENOMEM;
--
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b077ee980000
>
> HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
> git tree: upstream
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ccbdf43d5e7
diff -pur c/include/net/bluetooth/l2cap.h d/include/net/bluetooth/l2cap.h
--- c/include/net/bluetooth/l2cap.h 2024-06-17 18:33:27.096664300 +0800
+++ d/include/net/bluetooth/l2cap.h 2024-06-17 18:34:47.465834700 +0800
@@ -612,6 +612,7 @@ struct l2cap_chan {
void *data;
const struct l2cap_ops *ops;
struct mutex lock;
+ unsigned int closed;
};
struct l2cap_ops {
diff -pur c/net/bluetooth/l2cap_core.c d/net/bluetooth/l2cap_core.c
--- c/net/bluetooth/l2cap_core.c 2024-06-17 18:32:21.249083200 +0800
+++ d/net/bluetooth/l2cap_core.c 2024-06-17 18:35:47.981139900 +0800
@@ -812,6 +812,7 @@ void l2cap_chan_close(struct l2cap_chan
{
struct l2cap_conn *conn = chan->conn;
+ chan->closed++;
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
switch (chan->state) {
diff -pur c/net/bluetooth/l2cap_sock.c d/net/bluetooth/l2cap_sock.c
--- c/net/bluetooth/l2cap_sock.c 2024-06-17 18:31:43.431535400 +0800
+++ d/net/bluetooth/l2cap_sock.c 2024-06-17 18:41:00.785238900 +0800
@@ -1482,10 +1482,17 @@ static struct l2cap_chan *l2cap_sock_new
static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
{
struct sock *sk = chan->data;
- struct l2cap_pinfo *pi = l2cap_pi(sk);
+ struct l2cap_pinfo *pi;
int err;
+ l2cap_chan_lock(chan);
+ if (chan->closed) {
+ l2cap_chan_unlock(chan);
+ return -ENOMEM;
+ }
lock_sock(sk);
+ pi = l2cap_pi(sk);
+ l2cap_chan_unlock(chan);
if (chan->mode == L2CAP_MODE_ERTM && !list_empty(&pi->rx_busy)) {
err = -ENOMEM;
--
syzbot
Jun 18, 2024, 7:10:05 AM (8 days ago) Jun 18
to hda...@sina.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+49092d...@syzkaller.appspotmail.com
Tested on:
commit: 2ccbdf43 Merge tag 'for-linus' of git://git.kernel.org..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=15fc34fa980000
Note: testing is done by a robot and is best-effort only.
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+49092d...@syzkaller.appspotmail.com
Tested on:
commit: 2ccbdf43 Merge tag 'for-linus' of git://git.kernel.org..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=15fc34fa980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=14f4cca6980000
dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Note: testing is done by a robot and is best-effort only.
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