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[97.90.198.83]) by smtp.gmail.com with ESMTPSA id o4sm14232075pjg.2.2021.05.04.14.50.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 May 2021 14:50:05 -0700 (PDT) Subject: Re: KASAN: use-after-free Read in hci_chan_del To: davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000adea7f05abeb19cf@google.com> From: ETenal Message-ID: Date: Tue, 4 May 2021 14:50:03 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <000000000000adea7f05abeb19cf@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi, This is SyzScope, a research project that aims to reveal high-risk primitives from a seemingly low-risk bug (UAF/OOB read, WARNING, BUG, etc.). We are currently testing seemingly low-risk bugs on syzbot's open section(https://syzkaller.appspot.com/upstream), and try to reach out to kernel developers as long as SyzScope discovers any high-risk primitives. Please let us know if SyzScope indeed helps, and any suggestions/feedback. Regrading the bug "KASAN: use-after-free Read in hci_chan_del", SyzScope reports 3 memory write capability. The detailed comments can be found at https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_chan_del On 8/2/2020 1:45 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: ac3a0c84 Merge git://git.kernel.org/pub/scm/linux/kernel/g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=11b8d570900000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e59ee776d5aa8d55 > dashboard link: https://syzkaller.appspot.com/bug?extid=305a91e025a73e4fd6ce > compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f7ceea900000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e5de04900000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+305a91e025a73e4fd6ce@syzkaller.appspotmail.com > > IPVS: ftp: loaded support on port[0] = 21 > ================================================================== > BUG: KASAN: use-after-free in hci_chan_del+0x33/0x130 net/bluetooth/hci_conn.c:1707 > Read of size 8 at addr ffff8880a9591f18 by task syz-executor081/6793 > > CPU: 0 PID: 6793 Comm: syz-executor081 Not tainted 5.8.0-rc7-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1f0/0x31e lib/dump_stack.c:118 > print_address_description+0x66/0x5a0 mm/kasan/report.c:383 > __kasan_report mm/kasan/report.c:513 [inline] > kasan_report+0x132/0x1d0 mm/kasan/report.c:530 > hci_chan_del+0x33/0x130 net/bluetooth/hci_conn.c:1707 > l2cap_conn_del+0x4c2/0x650 net/bluetooth/l2cap_core.c:1900 > hci_disconn_cfm include/net/bluetooth/hci_core.h:1355 [inline] > hci_conn_hash_flush+0x127/0x200 net/bluetooth/hci_conn.c:1536 > hci_dev_do_close+0xb7b/0x1040 net/bluetooth/hci_core.c:1761 > hci_unregister_dev+0x16d/0x1590 net/bluetooth/hci_core.c:3606 > vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:340 > __fput+0x2f0/0x750 fs/file_table.c:281 > task_work_run+0x137/0x1c0 kernel/task_work.c:135 > exit_task_work include/linux/task_work.h:25 [inline] > do_exit+0x601/0x1f80 kernel/exit.c:805 > do_group_exit+0x161/0x2d0 kernel/exit.c:903 > __do_sys_exit_group+0x13/0x20 kernel/exit.c:914 > __se_sys_exit_group+0x10/0x10 kernel/exit.c:912 > __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912 > do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x444fe8 > Code: Bad RIP value. > RSP: 002b:00007ffe96e46e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000444fe8 > RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 > RBP: 00000000004ccdd0 R08: 00000000000000e7 R09: ffffffffffffffd0 > R10: 00007f5ee25cd700 R11: 0000000000000246 R12: 0000000000000001 > R13: 00000000006e0200 R14: 0000000000000000 R15: 0000000000000000 > > Allocated by task 6821: > save_stack mm/kasan/common.c:48 [inline] > set_track mm/kasan/common.c:56 [inline] > __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 > kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 > kmalloc include/linux/slab.h:555 [inline] > kzalloc include/linux/slab.h:669 [inline] > hci_chan_create+0x9a/0x270 net/bluetooth/hci_conn.c:1692 > l2cap_conn_add+0x66/0xb00 net/bluetooth/l2cap_core.c:7699 > l2cap_connect_cfm+0xdb/0x12b0 net/bluetooth/l2cap_core.c:8097 > hci_connect_cfm include/net/bluetooth/hci_core.h:1340 [inline] > hci_remote_features_evt net/bluetooth/hci_event.c:3210 [inline] > hci_event_packet+0x1164c/0x18260 net/bluetooth/hci_event.c:6061 > hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705 > process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 > worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 > kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 > > Freed by task 1530: > save_stack mm/kasan/common.c:48 [inline] > set_track mm/kasan/common.c:56 [inline] > kasan_set_free_info mm/kasan/common.c:316 [inline] > __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 > __cache_free mm/slab.c:3426 [inline] > kfree+0x10a/0x220 mm/slab.c:3757 > hci_disconn_loglink_complete_evt net/bluetooth/hci_event.c:4999 [inline] > hci_event_packet+0x304e/0x18260 net/bluetooth/hci_event.c:6188 > hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705 > process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 > worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 > kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 > > The buggy address belongs to the object at ffff8880a9591f00 > which belongs to the cache kmalloc-128 of size 128 > The buggy address is located 24 bytes inside of > 128-byte region [ffff8880a9591f00, ffff8880a9591f80) > The buggy address belongs to the page: > page:ffffea0002a56440 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a9591800 > flags: 0xfffe0000000200(slab) > raw: 00fffe0000000200 ffffea0002a5a648 ffffea00028a4a08 ffff8880aa400700 > raw: ffff8880a9591800 ffff8880a9591000 000000010000000a 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8880a9591e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880a9591e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >> ffff8880a9591f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8880a9591f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880a9592000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > 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. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches >