[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.173' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.709617] ================================================================== [ 34.721787] BUG: KASAN: slab-out-of-bounds in squashfs_export_iget+0x274/0x2a0 [ 34.729150] Read of size 8 at addr ffff8880b079ff10 by task syz-executor555/8138 [ 34.736681] [ 34.738310] CPU: 1 PID: 8138 Comm: syz-executor555 Not tainted 4.19.163-syzkaller #0 [ 34.746185] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.755533] Call Trace: [ 34.758128] dump_stack+0x1fc/0x2fe [ 34.761764] print_address_description.cold+0x54/0x219 [ 34.767048] kasan_report_error.cold+0x8a/0x1c7 [ 34.771714] ? squashfs_export_iget+0x274/0x2a0 [ 34.776364] __asan_report_load8_noabort+0x88/0x90 [ 34.781272] ? squashfs_export_iget+0x274/0x2a0 [ 34.785920] squashfs_export_iget+0x274/0x2a0 [ 34.790460] ? squashfs_readdir.cold+0x4c/0x4c [ 34.795064] ? depot_save_stack+0x258/0x40a [ 34.799369] ? __lock_acquire+0x6de/0x3ff0 [ 34.803590] squashfs_fh_to_dentry+0x78/0xb0 [ 34.807986] exportfs_decode_fh+0x126/0x7d8 [ 34.812286] ? drop_caches_sysctl_handler.cold+0x79/0x79 [ 34.817713] ? squashfs_get_parent+0xa0/0xa0 [ 34.822100] ? reconnect_path+0x7e0/0x7e0 [ 34.826230] ? lock_downgrade+0x720/0x720 [ 34.830357] ? lock_acquire+0x170/0x3c0 [ 34.834309] ? debug_check_no_obj_freed+0xb5/0x482 [ 34.839231] ? __might_fault+0x11f/0x1d0 [ 34.843273] ? lock_downgrade+0x720/0x720 [ 34.847429] ? lock_acquire+0x170/0x3c0 [ 34.851405] ? __might_fault+0xef/0x1d0 [ 34.855361] ? __might_fault+0x192/0x1d0 [ 34.859419] do_handle_open+0x2f4/0x650 [ 34.863373] ? do_sys_name_to_handle+0x480/0x480 [ 34.868106] ? fput+0x2b/0x190 [ 34.871281] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.876302] ? do_syscall_64+0x21/0x620 [ 34.880256] do_syscall_64+0xf9/0x620 [ 34.884051] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.889246] RIP: 0033:0x444ee9 [ 34.892430] Code: 1d d5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb d4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 34.911332] RSP: 002b:00007ffc607d7af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 [ 34.919045] RAX: ffffffffffffffda RBX: 00007ffc607d7ba0 RCX: 0000000000444ee9 [ 34.926308] RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003 [ 34.933555] RBP: 0000000000000000 R08: 0000000000401100 R09: 0000000000401100 [ 34.940803] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a7e38 [ 34.948049] R13: 00000000004028f0 R14: 0000000000000000 R15: 0000000000000000 [ 34.955322] [ 34.956931] Allocated by task 6337: [ 34.960552] kmem_cache_alloc+0x122/0x370 [ 34.964679] getname_flags+0xce/0x590 [ 34.968457] user_path_at_empty+0x2a/0x50 [ 34.972593] vfs_statx+0x113/0x210 [ 34.976108] __se_sys_newlstat+0x96/0x120 [ 34.980242] do_syscall_64+0xf9/0x620 [ 34.984020] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.989183] [ 34.990802] Freed by task 6337: [ 34.994059] kmem_cache_free+0x7f/0x260 [ 34.998201] putname+0xe1/0x120 [ 35.001474] filename_lookup+0x3d0/0x5a0 [ 35.005511] vfs_statx+0x113/0x210 [ 35.009028] __se_sys_newlstat+0x96/0x120 [ 35.013174] do_syscall_64+0xf9/0x620 [ 35.016953] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.022114] [ 35.023719] The buggy address belongs to the object at ffff8880b079e740 [ 35.023719] which belongs to the cache names_cache of size 4096 [ 35.036536] The buggy address is located 2000 bytes to the right of [ 35.036536] 4096-byte region [ffff8880b079e740, ffff8880b079f740) [ 35.049179] The buggy address belongs to the page: [ 35.054085] page:ffffea0002c1e780 count:1 mapcount:0 mapping:ffff88813be83e40 index:0x0 compound_mapcount: 0 [ 35.064027] flags: 0xfff00000008100(slab|head) [ 35.068590] raw: 00fff00000008100 ffffea0002c12708 ffffea0002cb2588 ffff88813be83e40 [ 35.076448] raw: 0000000000000000 ffff8880b079e740 0000000100000001 0000000000000000 [ 35.084303] page dumped because: kasan: bad access detected [ 35.089985] [ 35.091586] Memory state around the buggy address: [ 35.096493] ffff8880b079fe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.103828] ffff8880b079fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.111175] >ffff8880b079ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.118508] ^ [ 35.122370] ffff8880b079ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.129704] ffff8880b07a0000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.137039] ================================================================== [ 35.144372] Disabling lock debugging due to kernel taint [ 35.154205] Kernel panic - not syncing: panic_on_warn set ... [ 35.154205] [ 35.154220] CPU: 0 PID: 8138 Comm: syz-executor555 Tainted: G B 4.19.163-syzkaller #0 [ 35.154226] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.154229] Call Trace: [ 35.154247] dump_stack+0x1fc/0x2fe [ 35.154262] panic+0x26a/0x50e [ 35.154274] ? __warn_printk+0xf3/0xf3 [ 35.154287] ? preempt_schedule_common+0x45/0xc0 [ 35.154318] ? ___preempt_schedule+0x16/0x18 [ 35.202690] ? trace_hardirqs_on+0x55/0x210 [ 35.206992] kasan_end_report+0x43/0x49 [ 35.210945] kasan_report_error.cold+0xa7/0x1c7 [ 35.215595] ? squashfs_export_iget+0x274/0x2a0 [ 35.220239] __asan_report_load8_noabort+0x88/0x90 [ 35.225147] ? squashfs_export_iget+0x274/0x2a0 [ 35.229819] squashfs_export_iget+0x274/0x2a0 [ 35.234291] ? squashfs_readdir.cold+0x4c/0x4c [ 35.238849] ? depot_save_stack+0x258/0x40a [ 35.243154] ? __lock_acquire+0x6de/0x3ff0 [ 35.247455] squashfs_fh_to_dentry+0x78/0xb0 [ 35.251852] exportfs_decode_fh+0x126/0x7d8 [ 35.256157] ? drop_caches_sysctl_handler.cold+0x79/0x79 [ 35.261583] ? squashfs_get_parent+0xa0/0xa0 [ 35.265968] ? reconnect_path+0x7e0/0x7e0 [ 35.270092] ? lock_downgrade+0x720/0x720 [ 35.274217] ? lock_acquire+0x170/0x3c0 [ 35.278169] ? debug_check_no_obj_freed+0xb5/0x482 [ 35.283077] ? __might_fault+0x11f/0x1d0 [ 35.287146] ? lock_downgrade+0x720/0x720 [ 35.291270] ? lock_acquire+0x170/0x3c0 [ 35.295221] ? __might_fault+0xef/0x1d0 [ 35.299213] ? __might_fault+0x192/0x1d0 [ 35.303253] do_handle_open+0x2f4/0x650 [ 35.307210] ? do_sys_name_to_handle+0x480/0x480 [ 35.311954] ? fput+0x2b/0x190 [ 35.315132] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.320131] ? do_syscall_64+0x21/0x620 [ 35.324088] do_syscall_64+0xf9/0x620 [ 35.327866] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.333041] RIP: 0033:0x444ee9 [ 35.336222] Code: 1d d5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb d4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 35.355114] RSP: 002b:00007ffc607d7af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 [ 35.362815] RAX: ffffffffffffffda RBX: 00007ffc607d7ba0 RCX: 0000000000444ee9 [ 35.370064] RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003 [ 35.377319] RBP: 0000000000000000 R08: 0000000000401100 R09: 0000000000401100 [ 35.384567] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a7e38 [ 35.391826] R13: 00000000004028f0 R14: 0000000000000000 R15: 0000000000000000 [ 35.399895] Kernel Offset: disabled [ 35.403505] Rebooting in 86400 seconds..