EXT4-fs (loop4): Invalid log cluster size: 33554432 Enabling of bearer rejected, already enabled Disabling bearer ================================================================== BUG: KASAN: use-after-free in tipc_udp_xmit+0x96b/0xc10 net/tipc/udp_media.c:193 Read of size 8 at addr ffff88804d3b10e0 by task systemd-udevd/4706 CPU: 0 PID: 4706 Comm: systemd-udevd Not tainted 4.19.204-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+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tipc_udp_xmit+0x96b/0xc10 net/tipc/udp_media.c:193 tipc_udp_send_msg+0x279/0x490 net/tipc/udp_media.c:248 tipc_bearer_xmit_skb+0x15b/0x330 net/tipc/bearer.c:518 tipc_disc_timeout+0x855/0xc90 net/tipc/discover.c:332 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__devcgroup_check_permission+0x147/0x3c0 security/device_cgroup.c:812 Code: ff df 49 8b 5f 28 48 8d bb 40 01 00 00 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 51 02 00 00 8b 83 40 01 00 00 01 00 00 00 44 0f bf fd 45 0f bf e4 48 8d ab 30 01 00 00 89 c6 RSP: 0018:ffff888098b17808 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff88809908b000 RCX: ffffffff8346e2a1 RDX: 1ffff11013211628 RSI: ffffffff8346e036 RDI: ffff88809908b140 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000007 R14: 0000000000000005 R15: ffff8880992c44c0 devcgroup_check_permission include/linux/device_cgroup.h:32 [inline] devcgroup_inode_permission include/linux/device_cgroup.h:54 [inline] __blkdev_get+0x7e8/0x1480 fs/block_dev.c:1465 blkdev_get+0xb0/0x940 fs/block_dev.c:1627 EXT4-fs (loop4): inodes count not valid: 32 vs 256 blkdev_open+0x202/0x290 fs/block_dev.c:1788 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f825b41b840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffd1a16bc28 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffd1a16bcd0 RCX: 00007f825b41b840 RDX: 0000563bf0d10fe3 RSI: 00000000000a0800 RDI: 0000563bf1a3c510 RBP: 00007ffd1a16c200 R08: 0000563bf0d10670 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd1a16bdd0 R13: 0000563bf1a27010 R14: 0000563bf1a2ced0 R15: 00007ffd1a16bca0 Allocated by task 13439: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 sock_alloc_inode+0x19/0x250 net/socket.c:244 alloc_inode+0x5d/0x180 fs/inode.c:211 new_inode_pseudo+0x14/0xe0 fs/inode.c:911 sock_alloc+0x3c/0x260 net/socket.c:567 __sock_create+0xba/0x740 net/socket.c:1327 udp_sock_create6+0xd1/0x550 net/ipv6/ip6_udp_tunnel.c:22 udp_sock_create include/net/udp_tunnel.h:61 [inline] tipc_udp_enable+0xb48/0x14d0 net/tipc/udp_media.c:734 tipc_enable_bearer+0x70f/0xbe0 net/tipc/bearer.c:317 __tipc_nl_bearer_enable+0x2e2/0x3d0 net/tipc/bearer.c:916 tipc_nl_bearer_enable+0x1e/0x30 net/tipc/bearer.c:925 genl_family_rcv_msg+0x642/0xc40 net/netlink/genetlink.c:602 genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2457 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2225 __sys_sendmsg net/socket.c:2263 [inline] __do_sys_sendmsg net/socket.c:2272 [inline] __se_sys_sendmsg net/socket.c:2270 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2270 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7231: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 destroy_inode+0xb9/0x110 fs/inode.c:268 iput_final fs/inode.c:1555 [inline] iput+0x4f1/0x860 fs/inode.c:1581 __sock_release net/socket.c:611 [inline] sock_release+0x174/0x1d0 net/socket.c:619 cleanup_bearer+0x1bb/0x280 net/tipc/udp_media.c:775 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff88804d3b10c0 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff88804d3b10c0, ffff88804d3b14a0) The buggy address belongs to the page: page:ffffea000134ec40 count:1 mapcount:0 mapping:ffff88823b33a6c0 index:0xffff88804d3b1ffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea000236e0c8 ffffea00009bafc8 ffff88823b33a6c0 raw: ffff88804d3b1ffd ffff88804d3b10c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804d3b0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804d3b1000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804d3b1080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88804d3b1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804d3b1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 49 8b fisttps -0x75(%rcx) 3: 5f pop %rdi 4: 28 48 8d sub %cl,-0x73(%rax) 7: bb 40 01 00 00 mov $0x140,%ebx c: 48 89 fa mov %rdi,%rdx f: 48 c1 ea 03 shr $0x3,%rdx 13: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 17: 84 c0 test %al,%al 19: 74 08 je 0x23 1b: 3c 03 cmp $0x3,%al 1d: 0f 8e 51 02 00 00 jle 0x274 23: 8b 83 40 01 00 00 mov 0x140(%rbx),%eax 29: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2e: 44 0f bf fd movswl %bp,%r15d 32: 45 0f bf e4 movswl %r12w,%r12d 36: 48 8d ab 30 01 00 00 lea 0x130(%rbx),%rbp 3d: 89 c6 mov %eax,%esi