[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.483112] audit: type=1800 audit(1547038171.063:25): pid=7796 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.521111] audit: type=1800 audit(1547038171.073:26): pid=7796 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.544766] audit: type=1800 audit(1547038171.073:27): pid=7796 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 52.634569] ================================================================== [ 52.642073] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x9ec/0xa00 [ 52.649079] Write of size 8 at addr ffff88808bff2d90 by task syz-executor356/8490 [ 52.656686] [ 52.658302] CPU: 0 PID: 8490 Comm: syz-executor356 Not tainted 4.20.0+ #14 [ 52.665292] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.674628] Call Trace: [ 52.677207] dump_stack+0x1db/0x2d0 [ 52.680832] ? dump_stack_print_info.cold+0x20/0x20 [ 52.685835] ? lock_downgrade+0x910/0x910 [ 52.689967] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 52.694635] print_address_description.cold+0x7c/0x20d [ 52.699921] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 52.704625] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 52.709294] kasan_report.cold+0x1b/0x40 [ 52.713354] ? write_comp_data+0x61/0x70 [ 52.717406] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 52.722059] __asan_report_store8_noabort+0x17/0x20 [ 52.727073] __xfrm_policy_unlink+0x9ec/0xa00 [ 52.731572] ? xfrm_policy_walk_done+0x360/0x360 [ 52.736336] ? xfrm_policy_byid+0x4a0/0x4a0 [ 52.740656] ? refcount_inc_checked+0x2b/0x70 [ 52.745149] ? __xfrm_policy_link+0x220/0x2f0 [ 52.749640] ? xfrm_pol_inexact_addr_use_any_list+0x1f0/0x1f0 [ 52.755546] xfrm_policy_insert+0x223/0x910 [ 52.759890] ? xfrm_policy_inexact_insert+0xda0/0xda0 [ 52.765100] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 52.770281] pfkey_spdadd+0x111a/0x19a0 [ 52.774248] ? pfkey_spddelete+0x1090/0x1090 [ 52.778643] ? iov_iter_advance+0x354/0x1490 [ 52.783076] ? pfkey_spddelete+0x1090/0x1090 [ 52.787475] pfkey_process+0x6d2/0x810 [ 52.791351] ? pfkey_send_new_mapping+0x11f0/0x11f0 [ 52.796352] ? copyin+0xb5/0x100 [ 52.799714] ? aa_sk_perm+0x234/0x8e0 [ 52.803534] pfkey_sendmsg+0x5bb/0xfc0 [ 52.807432] ? pfkey_spdget+0xa50/0xa50 [ 52.811418] ? apparmor_socket_sendmsg+0x2a/0x30 [ 52.816191] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.821720] ? security_socket_sendmsg+0x93/0xc0 [ 52.826470] ? pfkey_spdget+0xa50/0xa50 [ 52.830438] sock_sendmsg+0xdd/0x130 [ 52.834157] ___sys_sendmsg+0x7ec/0x910 [ 52.838129] ? copy_msghdr_from_user+0x570/0x570 [ 52.842875] ? find_held_lock+0x35/0x120 [ 52.846919] ? __fd_install+0x2a0/0x8c0 [ 52.850880] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.856408] ? lock_downgrade+0x910/0x910 [ 52.860555] ? kasan_check_read+0x11/0x20 [ 52.864700] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.870237] ? __fget_light+0x2db/0x420 [ 52.874208] ? fget_raw+0x20/0x20 [ 52.877657] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.883206] ? __fdget+0x1b/0x20 [ 52.886577] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 52.892104] ? sockfd_lookup_light+0xc2/0x160 [ 52.896590] __sys_sendmsg+0x112/0x270 [ 52.900463] ? __ia32_sys_shutdown+0x80/0x80 [ 52.904878] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.910248] ? trace_hardirqs_off_caller+0x300/0x300 [ 52.915376] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.920174] __x64_sys_sendmsg+0x78/0xb0 [ 52.924255] do_syscall_64+0x1a3/0x800 [ 52.928139] ? syscall_return_slowpath+0x5f0/0x5f0 [ 52.933101] ? prepare_exit_to_usermode+0x232/0x3b0 [ 52.938124] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.942961] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.948166] RIP: 0033:0x442099 [ 52.951379] Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 db 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 52.970287] RSP: 002b:00007ffcc38cd908 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 52.977980] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442099 [ 52.985240] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 [ 52.992492] RBP: 0000000000000000 R08: 0000000000002124 R09: 0000000000002124 [ 52.999749] R10: 0000000000002124 R11: 0000000000000246 R12: 000000000000005a [ 53.007019] R13: 000000000000cd58 R14: 0000000000000000 R15: 0000000000000000 [ 53.014279] [ 53.015887] Allocated by task 8484: [ 53.019509] save_stack+0x45/0xd0 [ 53.022971] kasan_kmalloc+0xcf/0xe0 [ 53.026665] kmem_cache_alloc_trace+0x151/0x760 [ 53.031317] xfrm_policy_alloc+0xfb/0x530 [ 53.035448] pfkey_spdadd+0x24d/0x19a0 [ 53.039316] pfkey_process+0x6d2/0x810 [ 53.043186] pfkey_sendmsg+0x5bb/0xfc0 [ 53.047071] sock_sendmsg+0xdd/0x130 [ 53.050775] ___sys_sendmsg+0x7ec/0x910 [ 53.054745] __sys_sendmsg+0x112/0x270 [ 53.058617] __x64_sys_sendmsg+0x78/0xb0 [ 53.062659] do_syscall_64+0x1a3/0x800 [ 53.066542] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.071706] [ 53.073317] Freed by task 16: [ 53.076417] save_stack+0x45/0xd0 [ 53.079851] __kasan_slab_free+0x102/0x150 [ 53.084068] kasan_slab_free+0xe/0x10 [ 53.087850] kfree+0xcf/0x230 [ 53.090941] xfrm_policy_destroy_rcu+0x48/0x60 [ 53.095512] rcu_process_callbacks+0xc4a/0x1680 [ 53.100206] __do_softirq+0x30b/0xb11 [ 53.103980] [ 53.105599] The buggy address belongs to the object at ffff88808bff2d80 [ 53.105599] which belongs to the cache kmalloc-1k of size 1024 [ 53.118243] The buggy address is located 16 bytes inside of [ 53.118243] 1024-byte region [ffff88808bff2d80, ffff88808bff3180) [ 53.130090] The buggy address belongs to the page: [ 53.135004] page:ffffea00022ffc80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 [ 53.144964] flags: 0x1fffc0000010200(slab|head) [ 53.149627] raw: 01fffc0000010200 ffffea00022f7008 ffffea000238f108 ffff88812c3f0ac0 [ 53.157492] raw: 0000000000000000 ffff88808bff2000 0000000100000007 0000000000000000 [ 53.165347] page dumped because: kasan: bad access detected [ 53.171030] [ 53.172642] Memory state around the buggy address: [ 53.177567] ffff88808bff2c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program executing program [ 53.184906] ffff88808bff2d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 53.192267] >ffff88808bff2d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.199604] ^ [ 53.203481] ffff88808bff2e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.210823] ffff88808bff2e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.218165] ================================================================== [ 53.225507] Disabling lock debugging due to kernel taint [ 53.231004] Kernel panic - not syncing: panic_on_warn set ... [ 53.236894] CPU: 0 PID: 8490 Comm: syz-executor356 Tainted: G B 4.20.0+ #14 [ 53.245310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.254657] Call Trace: [ 53.257233] dump_stack+0x1db/0x2d0 [ 53.260855] ? dump_stack_print_info.cold+0x20/0x20 [ 53.265857] panic+0x2cb/0x589 [ 53.269036] ? add_taint.cold+0x16/0x16 [ 53.272998] ? trace_hardirqs_on+0xb4/0x310 [ 53.277324] ? trace_hardirqs_on+0xb4/0x310 [ 53.281640] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 53.286290] end_report+0x47/0x4f [ 53.289735] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 53.294397] kasan_report.cold+0xe/0x40 [ 53.298352] ? write_comp_data+0x61/0x70 [ 53.302393] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 53.307045] __asan_report_store8_noabort+0x17/0x20 [ 53.312046] __xfrm_policy_unlink+0x9ec/0xa00 [ 53.316562] ? xfrm_policy_walk_done+0x360/0x360 [ 53.321308] ? xfrm_policy_byid+0x4a0/0x4a0 [ 53.325611] ? refcount_inc_checked+0x2b/0x70 [ 53.330111] ? __xfrm_policy_link+0x220/0x2f0 [ 53.334594] ? xfrm_pol_inexact_addr_use_any_list+0x1f0/0x1f0 [ 53.340462] xfrm_policy_insert+0x223/0x910 [ 53.344767] ? xfrm_policy_inexact_insert+0xda0/0xda0 [ 53.349938] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 53.355129] pfkey_spdadd+0x111a/0x19a0 [ 53.359112] ? pfkey_spddelete+0x1090/0x1090 [ 53.363565] ? iov_iter_advance+0x354/0x1490 [ 53.367973] ? pfkey_spddelete+0x1090/0x1090 [ 53.372373] pfkey_process+0x6d2/0x810 [ 53.376420] ? pfkey_send_new_mapping+0x11f0/0x11f0 [ 53.381427] ? copyin+0xb5/0x100 [ 53.384782] ? aa_sk_perm+0x234/0x8e0 [ 53.388574] pfkey_sendmsg+0x5bb/0xfc0 [ 53.392459] ? pfkey_spdget+0xa50/0xa50 [ 53.396427] ? apparmor_socket_sendmsg+0x2a/0x30 [ 53.401174] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.406693] ? security_socket_sendmsg+0x93/0xc0 [ 53.411430] ? pfkey_spdget+0xa50/0xa50 [ 53.415387] sock_sendmsg+0xdd/0x130 [ 53.419083] ___sys_sendmsg+0x7ec/0x910 [ 53.423067] ? copy_msghdr_from_user+0x570/0x570 [ 53.427815] ? find_held_lock+0x35/0x120 [ 53.431869] ? __fd_install+0x2a0/0x8c0 [ 53.435826] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.441347] ? lock_downgrade+0x910/0x910 [ 53.445483] ? kasan_check_read+0x11/0x20 [ 53.449632] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.455154] ? __fget_light+0x2db/0x420 [ 53.459123] ? fget_raw+0x20/0x20 [ 53.462559] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.468095] ? __fdget+0x1b/0x20 [ 53.471443] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.476961] ? sockfd_lookup_light+0xc2/0x160 [ 53.481454] __sys_sendmsg+0x112/0x270 [ 53.485329] ? __ia32_sys_shutdown+0x80/0x80 [ 53.489736] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.495090] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.500190] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.504949] __x64_sys_sendmsg+0x78/0xb0 [ 53.509017] do_syscall_64+0x1a3/0x800 [ 53.512910] ? syscall_return_slowpath+0x5f0/0x5f0 [ 53.517835] ? prepare_exit_to_usermode+0x232/0x3b0 [ 53.522845] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.527700] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.532879] RIP: 0033:0x442099 [ 53.536089] Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 db 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 53.555003] RSP: 002b:00007ffcc38cd908 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 53.562720] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442099 [ 53.569983] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 [ 53.577239] RBP: 0000000000000000 R08: 0000000000002124 R09: 0000000000002124 [ 53.584499] R10: 0000000000002124 R11: 0000000000000246 R12: 000000000000005a [ 53.591779] R13: 000000000000cd58 R14: 0000000000000000 R15: 0000000000000000 [ 53.599969] Kernel Offset: disabled [ 53.603591] Rebooting in 86400 seconds..