audit: type=1400 audit(1563800426.076:7140): avc: denied { map } for pid=11414 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Bluetooth: Invalid header checksum ================================================================== BUG: KASAN: use-after-free in h5_rx_3wire_hdr+0x317/0x370 /drivers/bluetooth/hci_h5.c:407 Read of size 1 at addr ffff88805f625948 by task syz-executor.0/11430 CPU: 1 PID: 11430 Comm: syz-executor.0 Not tainted 4.14.134 #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c /lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc /mm/kasan/report.c:252 kasan_report_error /mm/kasan/report.c:351 [inline] kasan_report /mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af /mm/kasan/report.c:393 __asan_report_load1_noabort+0x14/0x20 /mm/kasan/report.c:427 h5_rx_3wire_hdr+0x317/0x370 /drivers/bluetooth/hci_h5.c:407 h5_recv+0x25c/0x3f0 /drivers/bluetooth/hci_h5.c:532 hci_uart_tty_receive+0x1f4/0x4d0 /drivers/bluetooth/hci_ldisc.c:603 tiocsti /drivers/tty/tty_io.c:2186 [inline] tty_ioctl+0xded/0x1320 /drivers/tty/tty_io.c:2572 vfs_ioctl /fs/ioctl.c:46 [inline] file_ioctl /fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 /fs/ioctl.c:684 Bluetooth: Invalid header checksum SYSC_ioctl /fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 /fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 /arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459819 RSP: 002b:00007fa283cc6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819 audit: type=1400 audit(1563800426.076:7141): avc: denied { map } for pid=11414 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 RDX: 0000000020000080 RSI: 0000000000005412 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa283cc76d4 R13: 00000000004c408a R14: 00000000004d7ff0 R15: 00000000ffffffff Allocated by task 8092: save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 /mm/kasan/kasan.c:447 set_track /mm/kasan/kasan.c:459 [inline] kasan_kmalloc /mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 /mm/kasan/kasan.c:529 __do_kmalloc_node /mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x51/0x80 /mm/slab.c:3696 __kmalloc_reserve.isra.0+0x40/0xe0 /net/core/skbuff.c:137 __alloc_skb+0xcf/0x500 /net/core/skbuff.c:205 alloc_skb /./include/linux/skbuff.h:980 [inline] bt_skb_alloc /./include/net/bluetooth/bluetooth.h:336 [inline] h5_rx_pkt_start+0xc2/0x260 /drivers/bluetooth/hci_h5.c:443 h5_recv+0x25c/0x3f0 /drivers/bluetooth/hci_h5.c:532 hci_uart_tty_receive+0x1f4/0x4d0 /drivers/bluetooth/hci_ldisc.c:603 tty_ldisc_receive_buf+0x14d/0x1a0 /drivers/tty/tty_buffer.c:459 tty_port_default_receive_buf+0x73/0xa0 /drivers/tty/tty_port.c:37 receive_buf /drivers/tty/tty_buffer.c:475 [inline] flush_to_ldisc+0x1ec/0x400 /drivers/tty/tty_buffer.c:527 process_one_work+0x863/0x1600 /kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 /kernel/workqueue.c:2248 kthread+0x319/0x430 /kernel/kthread.c:232 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:404 Freed by task 8092: save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 /mm/kasan/kasan.c:447 set_track /mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 /mm/kasan/kasan.c:524 __cache_free /mm/slab.c:3496 [inline] kfree+0xcc/0x270 /mm/slab.c:3815 skb_free_head+0x8b/0xb0 /net/core/skbuff.c:554 skb_release_data+0x4af/0x700 /net/core/skbuff.c:574 skb_release_all+0x4d/0x60 /net/core/skbuff.c:631 __kfree_skb /net/core/skbuff.c:645 [inline] kfree_skb+0xb5/0x340 /net/core/skbuff.c:663 h5_reset_rx+0x4c/0x100 /drivers/bluetooth/hci_h5.c:499 h5_rx_3wire_hdr+0x2af/0x370 /drivers/bluetooth/hci_h5.c:409 h5_recv+0x25c/0x3f0 /drivers/bluetooth/hci_h5.c:532 hci_uart_tty_receive+0x1f4/0x4d0 /drivers/bluetooth/hci_ldisc.c:603 tty_ldisc_receive_buf+0x14d/0x1a0 /drivers/tty/tty_buffer.c:459 tty_port_default_receive_buf+0x73/0xa0 /drivers/tty/tty_port.c:37 receive_buf /drivers/tty/tty_buffer.c:475 [inline] flush_to_ldisc+0x1ec/0x400 /drivers/tty/tty_buffer.c:527 process_one_work+0x863/0x1600 /kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 /kernel/workqueue.c:2248 kthread+0x319/0x430 /kernel/kthread.c:232 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff88805f625940 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 8 bytes inside of 8192-byte region [ffff88805f625940, ffff88805f627940) audit: type=1400 audit(1563800426.076:7142): avc: denied { map } for pid=11414 comm="blkid" path="/etc/ld.so.cache" dev="sda1" ino=2251 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 The buggy address belongs to the page: page:ffffea00017d8900 count:1 mapcount:0 mapping:ffff88805f625940 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff88805f625940 0000000000000000 0000000100000001 raw: ffffea00016ed820 ffffea00017dec20 ffff8880aa802080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805f625800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805f625880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805f625900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88805f625980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f625a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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