[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.60' (ECDSA) to the list of known hosts. 2021/05/03 00:39:44 fuzzer started 2021/05/03 00:39:45 dialing manager at 10.128.0.169:44661 2021/05/03 00:39:45 syscalls: 3571 2021/05/03 00:39:45 code coverage: enabled 2021/05/03 00:39:45 comparison tracing: enabled 2021/05/03 00:39:45 extra coverage: enabled 2021/05/03 00:39:45 setuid sandbox: enabled 2021/05/03 00:39:45 namespace sandbox: enabled 2021/05/03 00:39:45 Android sandbox: /sys/fs/selinux/policy does not exist 2021/05/03 00:39:45 fault injection: enabled 2021/05/03 00:39:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/03 00:39:45 net packet injection: enabled 2021/05/03 00:39:45 net device setup: enabled 2021/05/03 00:39:45 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2021/05/03 00:39:45 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/03 00:39:45 USB emulation: enabled 2021/05/03 00:39:45 hci packet injection: enabled 2021/05/03 00:39:45 wifi device emulation: enabled 2021/05/03 00:39:45 802.15.4 emulation: enabled 2021/05/03 00:39:45 fetching corpus: 0, signal 0/2000 (executing program) syzkaller login: [ 69.497245][ T8439] ================================================================== [ 69.505546][ T8439] BUG: KASAN: use-after-free in __skb_datagram_iter+0x6b8/0x770 [ 69.514437][ T8439] Read of size 4 at addr ffff88802eef0004 by task syz-fuzzer/8439 [ 69.522259][ T8439] [ 69.524599][ T8439] CPU: 1 PID: 8439 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 [ 69.534155][ T8439] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.544327][ T8439] Call Trace: [ 69.547621][ T8439] dump_stack+0x141/0x1d7 [ 69.552019][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 69.557328][ T8439] print_address_description.constprop.0.cold+0x5b/0x2f8 [ 69.564901][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 69.570205][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 69.575516][ T8439] kasan_report.cold+0x7c/0xd8 [ 69.580323][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 69.585610][ T8439] __skb_datagram_iter+0x6b8/0x770 [ 69.590716][ T8439] ? zerocopy_sg_from_iter+0x110/0x110 [ 69.596188][ T8439] skb_copy_datagram_iter+0x40/0x50 [ 69.601399][ T8439] tcp_recvmsg_locked+0x1048/0x22f0 [ 69.606618][ T8439] ? tcp_splice_read+0x8b0/0x8b0 [ 69.611558][ T8439] ? mark_held_locks+0x9f/0xe0 [ 69.616322][ T8439] ? __local_bh_enable_ip+0xa0/0x120 [ 69.621607][ T8439] tcp_recvmsg+0x134/0x550 [ 69.626019][ T8439] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 69.631392][ T8439] ? aa_sk_perm+0x311/0xab0 [ 69.636065][ T8439] inet_recvmsg+0x11b/0x5e0 [ 69.640576][ T8439] ? inet_sendpage+0x140/0x140 [ 69.645440][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.651764][ T8439] ? security_socket_recvmsg+0x8f/0xc0 [ 69.657225][ T8439] sock_read_iter+0x33c/0x470 [ 69.661899][ T8439] ? ____sys_recvmsg+0x600/0x600 [ 69.666835][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.673072][ T8439] ? fsnotify+0xa58/0x1060 [ 69.677960][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.684201][ T8439] new_sync_read+0x5b7/0x6e0 [ 69.688788][ T8439] ? ksys_lseek+0x1b0/0x1b0 [ 69.693302][ T8439] vfs_read+0x35c/0x570 [ 69.697453][ T8439] ksys_read+0x1ee/0x250 [ 69.702128][ T8439] ? vfs_write+0xa40/0xa40 [ 69.706796][ T8439] ? syscall_enter_from_user_mode+0x27/0x70 [ 69.712687][ T8439] do_syscall_64+0x3a/0xb0 [ 69.717097][ T8439] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 69.722986][ T8439] RIP: 0033:0x4af19b [ 69.726871][ T8439] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 69.746467][ T8439] RSP: 002b:000000c0000c5850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 69.754884][ T8439] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 69.762845][ T8439] RDX: 0000000000001000 RSI: 000000c000210000 RDI: 0000000000000006 [ 69.770823][ T8439] RBP: 000000c0000c58a0 R08: 0000000000000001 R09: 0000000000000002 [ 69.778783][ T8439] R10: 0000000000000723 R11: 0000000000000206 R12: ffffffffffffffff [ 69.786746][ T8439] R13: 0000000000002000 R14: 0000000000000020 R15: 0000000000000002 [ 69.794719][ T8439] [ 69.797028][ T8439] Allocated by task 8457: [ 69.801340][ T8439] kasan_save_stack+0x1b/0x40 [ 69.806014][ T8439] __kasan_kmalloc+0x9b/0xd0 [ 69.810599][ T8439] tomoyo_realpath_from_path+0xc3/0x620 [ 69.816145][ T8439] tomoyo_path_perm+0x21b/0x400 [ 69.820983][ T8439] security_inode_getattr+0xcf/0x140 [ 69.826256][ T8439] vfs_fstat+0x43/0xb0 [ 69.830313][ T8439] __do_sys_newfstat+0x81/0x100 [ 69.835152][ T8439] do_syscall_64+0x3a/0xb0 [ 69.839560][ T8439] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 69.845444][ T8439] [ 69.847751][ T8439] Freed by task 8457: [ 69.851713][ T8439] kasan_save_stack+0x1b/0x40 [ 69.856388][ T8439] kasan_set_track+0x1c/0x30 [ 69.860970][ T8439] kasan_set_free_info+0x20/0x30 [ 69.865906][ T8439] __kasan_slab_free+0xfb/0x130 [ 69.872480][ T8439] slab_free_freelist_hook+0xdf/0x240 [ 69.877846][ T8439] kfree+0xe5/0x7f0 [ 69.881643][ T8439] tomoyo_realpath_from_path+0x191/0x620 [ 69.887264][ T8439] tomoyo_path_perm+0x21b/0x400 [ 69.892101][ T8439] security_inode_getattr+0xcf/0x140 [ 69.897374][ T8439] vfs_fstat+0x43/0xb0 [ 69.901429][ T8439] __do_sys_newfstat+0x81/0x100 [ 69.906288][ T8439] do_syscall_64+0x3a/0xb0 [ 69.910698][ T8439] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 69.916618][ T8439] [ 69.918926][ T8439] The buggy address belongs to the object at ffff88802eef0000 [ 69.918926][ T8439] which belongs to the cache kmalloc-4k of size 4096 [ 69.933335][ T8439] The buggy address is located 4 bytes inside of [ 69.933335][ T8439] 4096-byte region [ffff88802eef0000, ffff88802eef1000) [ 69.946527][ T8439] The buggy address belongs to the page: [ 69.952139][ T8439] page:ffffea0000bbbc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2eef0 [ 69.962289][ T8439] head:ffffea0000bbbc00 order:3 compound_mapcount:0 compound_pincount:0 [ 69.970598][ T8439] flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) [ 69.978574][ T8439] raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011042140 [ 69.987145][ T8439] raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 [ 69.995808][ T8439] page dumped because: kasan: bad access detected [ 70.002199][ T8439] [ 70.004505][ T8439] Memory state around the buggy address: [ 70.010119][ T8439] ffff88802eeeff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 70.018166][ T8439] ffff88802eeeff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 70.026229][ T8439] >ffff88802eef0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.034273][ T8439] ^ [ 70.038344][ T8439] ffff88802eef0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.046392][ T8439] ffff88802eef0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.054434][ T8439] ================================================================== [ 70.062492][ T8439] Disabling lock debugging due to kernel taint [ 70.070205][ T8439] Kernel panic - not syncing: panic_on_warn set ... [ 70.076807][ T8439] CPU: 0 PID: 8439 Comm: syz-fuzzer Tainted: G B 5.12.0-rc8-next-20210423-syzkaller #0 [ 70.087745][ T8439] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.098171][ T8439] Call Trace: [ 70.101435][ T8439] dump_stack+0x141/0x1d7 [ 70.105760][ T8439] panic+0x306/0x73d [ 70.109693][ T8439] ? __warn_printk+0xf3/0xf3 [ 70.114268][ T8439] ? preempt_schedule_common+0x59/0xc0 [ 70.119712][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 70.124977][ T8439] ? preempt_schedule_thunk+0x16/0x18 [ 70.130330][ T8439] ? trace_hardirqs_on+0x38/0x1c0 [ 70.135461][ T8439] ? trace_hardirqs_on+0x51/0x1c0 [ 70.140478][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 70.145751][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 70.151034][ T8439] end_report.cold+0x5a/0x5a [ 70.155614][ T8439] kasan_report.cold+0x6a/0xd8 [ 70.160365][ T8439] ? __skb_datagram_iter+0x6b8/0x770 [ 70.165631][ T8439] __skb_datagram_iter+0x6b8/0x770 [ 70.170734][ T8439] ? zerocopy_sg_from_iter+0x110/0x110 [ 70.176180][ T8439] skb_copy_datagram_iter+0x40/0x50 [ 70.181384][ T8439] tcp_recvmsg_locked+0x1048/0x22f0 [ 70.186653][ T8439] ? tcp_splice_read+0x8b0/0x8b0 [ 70.191589][ T8439] ? mark_held_locks+0x9f/0xe0 [ 70.196349][ T8439] ? __local_bh_enable_ip+0xa0/0x120 [ 70.201645][ T8439] tcp_recvmsg+0x134/0x550 [ 70.206060][ T8439] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 70.211426][ T8439] ? aa_sk_perm+0x311/0xab0 [ 70.215916][ T8439] inet_recvmsg+0x11b/0x5e0 [ 70.220406][ T8439] ? inet_sendpage+0x140/0x140 [ 70.225240][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 70.231469][ T8439] ? security_socket_recvmsg+0x8f/0xc0 [ 70.236911][ T8439] sock_read_iter+0x33c/0x470 [ 70.241588][ T8439] ? ____sys_recvmsg+0x600/0x600 [ 70.246513][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 70.252736][ T8439] ? fsnotify+0xa58/0x1060 [ 70.257133][ T8439] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 70.263374][ T8439] new_sync_read+0x5b7/0x6e0 [ 70.267959][ T8439] ? ksys_lseek+0x1b0/0x1b0 [ 70.272525][ T8439] vfs_read+0x35c/0x570 [ 70.276679][ T8439] ksys_read+0x1ee/0x250 [ 70.280914][ T8439] ? vfs_write+0xa40/0xa40 [ 70.285411][ T8439] ? syscall_enter_from_user_mode+0x27/0x70 [ 70.291297][ T8439] do_syscall_64+0x3a/0xb0 [ 70.295700][ T8439] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 70.301592][ T8439] RIP: 0033:0x4af19b [ 70.305469][ T8439] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 70.325143][ T8439] RSP: 002b:000000c0000c5850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 70.333535][ T8439] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 70.341486][ T8439] RDX: 0000000000001000 RSI: 000000c000210000 RDI: 0000000000000006 [ 70.349526][ T8439] RBP: 000000c0000c58a0 R08: 0000000000000001 R09: 0000000000000002 [ 70.357653][ T8439] R10: 0000000000000723 R11: 0000000000000206 R12: ffffffffffffffff [ 70.365603][ T8439] R13: 0000000000002000 R14: 0000000000000020 R15: 0000000000000002 [ 70.374261][ T8439] Kernel Offset: disabled [ 70.378588][ T8439] Rebooting in 86400 seconds..