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AJvYcCVtOQ3AvntcTZUgZB2vDyq4EUVwRSdQKxSabtQ+2HgY4Y+NxZ+19kclz1zO2+sX2wC8/+HTFVXG0Or/LG4=@vger.kernel.org X-Gm-Message-State: AOJu0Yx89PqL/LxmmY3bTfnHRuwm8wUqtTQT6dSg/h24+cm4wsQ+I/QW au5Fgyt3wANeyPqSG+w+lG6svXSReb/Noqz3Zwe3m/hm1VpJtqiXjPDIgOyDb0BJmMVyKUINZLb eZFZHeonbq8oGyFUFPRdtpKDmP73N6usyokcVRH0GevULygymuuab4rI= X-Google-Smtp-Source: AGHT+IFB05Z0vyX9y26t3brUxqygKV1S/8tabOW7S2sEBdAihLaPHfSRX05/QjEOpxssWS7e5d5lrjcwKgjcmx0HS20OTGnPPWY/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d88:b0:3a7:8720:9e9e with SMTP id e9e14a558f8ab-3ce3a90ef12mr205170515ab.2.1736920385239; Tue, 14 Jan 2025 21:53:05 -0800 (PST) Date: Tue, 14 Jan 2025 21:53:05 -0800 In-Reply-To: <20250115052851.1857-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67874d41.050a0220.20d369.0006.GAE@google.com> Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_send_cmd From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in hci_send_acl Bluetooth: Wrong link type (-22) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 8192 Comm: kworker/u9:7 Not tainted 6.13.0-rc7-syzkaller-g619f0b6fad52-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: hci5 hci_rx_work RIP: 0010:hci_send_acl+0x3e/0xd00 net/bluetooth/hci_core.c:3232 Code: 00 89 54 24 04 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 a2 93 e6 f6 48 89 5c 24 18 4c 8d 73 18 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 c3 fd 4c f7 bd f8 0f 00 00 49 03 RSP: 0018:ffffc900057e72b8 EFLAGS: 00010206 RAX: ffffffff8ab8eece RBX: 0000000000000003 RCX: ffff8880304dbc00 RDX: 0000000000000000 RSI: ffff8880578f5c80 RDI: 0000000000000000 RBP: ffffc900057e7a98 R08: ffffffff8ac38d24 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100dbd7003 R12: ffff88802d5c0f4b R13: ffff8880578f5c80 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c005688000 CR3: 0000000032a00000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: l2cap_sig_send_rej net/bluetooth/l2cap_core.c:5508 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5544 [inline] l2cap_recv_frame+0x221f/0x10db0 net/bluetooth/l2cap_core.c:6823 l2cap_recv_acldata+0x51f/0x1530 net/bluetooth/l2cap_core.c:7518 hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline] hci_rx_work+0x508/0xdb0 net/bluetooth/hci_core.c:4040 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hci_send_acl+0x3e/0xd00 net/bluetooth/hci_core.c:3232 Code: 00 89 54 24 04 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 a2 93 e6 f6 48 89 5c 24 18 4c 8d 73 18 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 c3 fd 4c f7 bd f8 0f 00 00 49 03 RSP: 0018:ffffc900057e72b8 EFLAGS: 00010206 RAX: ffffffff8ab8eece RBX: 0000000000000003 RCX: ffff8880304dbc00 RDX: 0000000000000000 RSI: ffff8880578f5c80 RDI: 0000000000000000 RBP: ffffc900057e7a98 R08: ffffffff8ac38d24 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100dbd7003 R12: ffff88802d5c0f4b R13: ffff8880578f5c80 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c005688000 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 89 54 24 04 49 add %cl,0x49042454(%rcx) 6: 89 f5 mov %esi,%ebp 8: 48 89 fb mov %rdi,%rbx b: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 12: fc ff df 15: e8 a2 93 e6 f6 call 0xf6e693bc 1a: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 1f: 4c 8d 73 18 lea 0x18(%rbx),%r14 23: 4c 89 f3 mov %r14,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 c3 fd 4c f7 call 0xf74cfdfc 39: bd f8 0f 00 00 mov $0xff8,%ebp 3e: 49 rex.WB 3f: 03 .byte 0x3 Tested on: commit: 619f0b6f Merge tag 'seccomp-v6.13-rc8' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=145ebcb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aadf89e2f6db86cc dashboard link: https://syzkaller.appspot.com/bug?extid=31c2f641b850a348a734 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1276bcb0580000