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Message-ID: <67edcea4.050a0220.297a31.0022.GAE@google.com> Date: Wed, 02 Apr 2025 16:56:20 -0700 From: syzbot <syzbot+4ed6852d4da4606c93da@...kaller.appspotmail.com> To: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, luiz.dentz@...il.com, marcel@...tmann.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [bluetooth?] general protection fault in bcsp_recv syzbot has found a reproducer for the following issue on: HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=135a6178580000 kernel config: https://syzkaller.appspot.com/x/.config?x=410c49aba9aeb859 dashboard link: https://syzkaller.appspot.com/bug?extid=4ed6852d4da4606c93da 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=134ec7cf980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13315274580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-acc4d5ff.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aad60517b1c2/vmlinux-acc4d5ff.xz kernel image: https://storage.googleapis.com/syzbot-assets/27bf64833684/bzImage-acc4d5ff.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ed6852d4da4606c93da@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 1 UID: 0 PID: 5945 Comm: syz-executor103 Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:bcsp_recv+0x10a/0x17f0 drivers/bluetooth/hci_bcsp.c:590 Code: 18 48 c1 e8 03 48 01 e8 48 89 04 24 48 8d 83 78 01 00 00 48 89 44 24 28 48 c1 e8 03 48 89 44 24 08 e8 aa ca 5c f9 48 8b 04 24 <80> 38 00 0f 85 d1 12 00 00 4c 8b ab 08 01 00 00 31 ff 4c 89 ee e8 RSP: 0018:ffffc90003467bf0 EFLAGS: 00010293 RAX: dffffc0000000021 RBX: 0000000000000000 RCX: ffffffff885e756a RDX: ffff888024910000 RSI: ffffffff885e75b6 RDI: 0000000000000005 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc90003467d88 R13: ffffc90003467d88 R14: 0000000000000001 R15: ffff88810735a800 FS: 00007ffb5ce256c0(0000) GS:ffff8880d6abb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc59fa2f98 CR3: 0000000024ec0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> hci_uart_tty_receive+0x251/0x7e0 drivers/bluetooth/hci_ldisc.c:627 tiocsti drivers/tty/tty_io.c:2299 [inline] tty_ioctl+0x57b/0x15f0 drivers/tty/tty_io.c:2716 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffb5ce97899 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 1f 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:00007ffb5ce25168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffb5cf1b418 RCX: 00007ffb5ce97899 RDX: 0000200000000140 RSI: 0000000000005412 RDI: 0000000000000004 RBP: 00007ffb5cf1b410 R08: 00007ffcd6d4fb07 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffb5cf1b41c R13: 0000000000000010 R14: 00007ffcd6d4fa20 R15: 00007ffcd6d4fb08 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bcsp_recv+0x10a/0x17f0 drivers/bluetooth/hci_bcsp.c:590 Code: 18 48 c1 e8 03 48 01 e8 48 89 04 24 48 8d 83 78 01 00 00 48 89 44 24 28 48 c1 e8 03 48 89 44 24 08 e8 aa ca 5c f9 48 8b 04 24 <80> 38 00 0f 85 d1 12 00 00 4c 8b ab 08 01 00 00 31 ff 4c 89 ee e8 RSP: 0018:ffffc90003467bf0 EFLAGS: 00010293 RAX: dffffc0000000021 RBX: 0000000000000000 RCX: ffffffff885e756a RDX: ffff888024910000 RSI: ffffffff885e75b6 RDI: 0000000000000005 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc90003467d88 R13: ffffc90003467d88 R14: 0000000000000001 R15: ffff88810735a800 FS: 00007ffb5ce256c0(0000) GS:ffff8880d6abb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc59fa2f98 CR3: 0000000024ec0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 18 48 c1 sbb %cl,-0x3f(%rax) 3: e8 03 48 01 e8 call 0xe801480b 8: 48 89 04 24 mov %rax,(%rsp) c: 48 8d 83 78 01 00 00 lea 0x178(%rbx),%rax 13: 48 89 44 24 28 mov %rax,0x28(%rsp) 18: 48 c1 e8 03 shr $0x3,%rax 1c: 48 89 44 24 08 mov %rax,0x8(%rsp) 21: e8 aa ca 5c f9 call 0xf95ccad0 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 80 38 00 cmpb $0x0,(%rax) <-- trapping instruction 2d: 0f 85 d1 12 00 00 jne 0x1304 33: 4c 8b ab 08 01 00 00 mov 0x108(%rbx),%r13 3a: 31 ff xor %edi,%edi 3c: 4c 89 ee mov %r13,%rsi 3f: e8 .byte 0xe8 --- 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.
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