audit: type=1400 audit(1596206090.429:8): avc: denied { execmem } for pid=6434 comm="syz-executor623" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:373 [inline] BUG: KASAN: slab-out-of-bounds in bacpy include/net/bluetooth/bluetooth.h:236 [inline] BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_with_rssi_evt+0x225/0x6b0 net/bluetooth/hci_event.c:3951 Read of size 6 at addr ffff88808cbbe9bb by task kworker/u5:0/1228 CPU: 0 PID: 1228 Comm: kworker/u5:0 Not tainted 4.19.135-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report+0x8f/0x96 mm/kasan/report.c:412 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:373 [inline] bacpy include/net/bluetooth/bluetooth.h:236 [inline] hci_inquiry_result_with_rssi_evt+0x225/0x6b0 net/bluetooth/hci_event.c:3951 hci_event_packet+0x18a3/0x858f net/bluetooth/hci_event.c:5833 hci_rx_work+0x46b/0xa90 net/bluetooth/hci_core.c:4359 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Allocated by task 6435: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline] vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:299 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4647: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 skb_free_head net/core/skbuff.c:554 [inline] skb_release_data+0x6de/0x920 net/core/skbuff.c:574 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb net/core/skbuff.c:645 [inline] consume_skb+0x113/0x3d0 net/core/skbuff.c:705 skb_free_datagram+0x16/0xf0 net/core/datagram.c:329 netlink_recvmsg+0x627/0xea0 net/netlink/af_netlink.c:1988 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg net/socket.c:802 [inline] sock_recvmsg+0xca/0x110 net/socket.c:798 ___sys_recvmsg+0x255/0x570 net/socket.c:2277 __sys_recvmsg net/socket.c:2326 [inline] __do_sys_recvmsg net/socket.c:2336 [inline] __se_sys_recvmsg net/socket.c:2333 [inline] __x64_sys_recvmsg+0x12f/0x220 net/socket.c:2333 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808cbbe7c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff88808cbbe7c0, ffff88808cbbe9c0) The buggy address belongs to the page: page:ffffea000232ef80 count:1 mapcount:0 mapping:ffff88812c39c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00022e7608 ffffea00022ee888 ffff88812c39c940 raw: 0000000000000000 ffff88808cbbe040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808cbbe880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808cbbe900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88808cbbe980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88808cbbea00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff88808cbbea80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================