ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2584672204 <...> rocess permissive=1 [ 15.961788][ T24] audit: type=1400 audit(1792890454.700:63): avc: denied { siginh } for pid=216 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.40' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2584672204", ["ci2-android-5-10/syz-executor2584672204"], 0x7ffcde83adc0 /* 10 vars */) = 0 brk(NULL) = 0x5555954b6000 brk(0x5555954b6d40) = 0x5555954b6d40 arch_prctl(ARCH_SET_FS, 0x5555954b63c0) = 0 set_tid_address(0x5555954b6690) = 297 set_robust_list(0x5555954b66a0, 24) = 0 rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 32, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlinkat(AT_FDCWD, "/proc/self/exe", "/root/ci2-android-5-10/syz-executor2584672204", 4096) = 45 getrandom("\xe9\x72\xa9\xd2\x40\xad\x08\xaf", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555954b6d40 brk(0x5555954d7d40) = 0x5555954d7d40 brk(0x5555954d8000) = 0x5555954d8000 mprotect(0x7efd94e64000, 20480, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 executing program write(1, "executing program\n", 18) = 18 socket(AF_PPPOX, SOCK_STREAM, 1) = 3 socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00"}, 50) = 0 sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) clone3({flags=CLONE_UNTRACED|CLONE_CHILD_SETTID|CLONE_NEWCGROUP|CLONE_NEWPID, child_tid=NULL, exit_signal=SIGRT_7, stack=NULL, stack_size=0, cgroup=4294967295}, 88) = 298 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 26.042843][ T24] audit: type=1400 audit(1792890464.830:64): avc: denied { execmem } for pid=297 comm="syz-executor258" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 26.062320][ T24] audit: type=1400 audit(1792890464.830:65): avc: denied { create } for pid=297 comm="syz-executor258" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.082642][ T24] audit: type=1400 audit(1792890464.830:66): avc: denied { connect } for pid=297 comm="syz-executor258" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.102561][ T24] audit: type=1400 audit(1792890464.860:67): avc: denied { ioctl } for pid=297 comm="syz-executor258" path="socket:[1971]" dev="sockfs" ino=1971 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.233539][ T298] ================================================================== [ 26.241663][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.249743][ T298] Read of size 4 at addr ffff8881041e9000 by task syz-executor258/298 [ 26.257875][ T298] [ 26.260212][ T298] CPU: 0 PID: 298 Comm: syz-executor258 Not tainted syzkaller #0 [ 26.267911][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 26.277955][ T298] Call Trace: [ 26.281237][ T298] __dump_stack+0x21/0x24 [ 26.285554][ T298] dump_stack_lvl+0x1a7/0x208 [ 26.290217][ T298] ? show_regs_print_info+0x18/0x18 [ 26.295411][ T298] ? thaw_kernel_threads+0x220/0x220 [ 26.300685][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 26.305874][ T298] print_address_description+0x7f/0x2c0 [ 26.311412][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.317136][ T298] kasan_report+0x100/0x140 [ 26.321642][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.327374][ T298] __asan_report_load4_noabort+0x14/0x20 [ 26.333008][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.338544][ T298] pppol2tp_release+0x150/0x2b0 [ 26.343396][ T298] sock_close+0xb8/0x200 [ 26.347626][ T298] ? sock_mmap+0xa0/0xa0 [ 26.351875][ T298] __fput+0x2dc/0x730 [ 26.355845][ T298] ____fput+0x15/0x20 [ 26.359821][ T298] task_work_run+0x127/0x190 [ 26.364428][ T298] do_exit+0xa7c/0x24e0 [ 26.368579][ T298] ? __kasan_check_write+0x14/0x20 [ 26.373687][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.378786][ T298] ? put_task_struct+0x90/0x90 [ 26.383535][ T298] ? fpu__clear_all+0x20/0x20 [ 26.388205][ T298] ? __kasan_check_read+0x11/0x20 [ 26.393226][ T298] __x64_sys_exit+0x40/0x40 [ 26.397721][ T298] do_syscall_64+0x31/0x40 [ 26.402138][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.408024][ T298] RIP: 0033:0x7efd94dd3d79 [ 26.412442][ T298] Code: Unable to access opcode bytes at RIP 0x7efd94dd3d4f. [ 26.419974][ T298] RSP: 002b:00007ffe9bd76a78 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.428643][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007efd94dd3d79 [ 26.436609][ T298] RDX: 00007efd94de5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.444574][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 26.452537][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe9bd76c98 [ 26.460501][ T298] R13: 0000000000000002 R14: 00007efd94e64ca0 R15: 0000000000000002 [ 26.468463][ T298] [ 26.470781][ T298] Allocated by task 297: [ 26.475016][ T298] __kasan_kmalloc+0xd4/0x100 [ 26.479681][ T298] __kmalloc+0x19f/0x330 [ 26.483929][ T298] l2tp_session_create+0x39/0xb60 [ 26.488944][ T298] pppol2tp_connect+0xbf5/0x1640 [ 26.493866][ T298] __sys_connect+0x3ce/0x450 [ 26.498445][ T298] __x64_sys_connect+0x7a/0x90 [ 26.503202][ T298] do_syscall_64+0x31/0x40 [ 26.507604][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.513479][ T298] [ 26.515797][ T298] Freed by task 291: [ 26.519690][ T298] kasan_set_track+0x4a/0x70 [ 26.524269][ T298] kasan_set_free_info+0x23/0x40 [ 26.529195][ T298] ____kasan_slab_free+0x125/0x160 [ 26.534294][ T298] __kasan_slab_free+0x11/0x20 [ 26.539046][ T298] slab_free_freelist_hook+0xc5/0x190 [ 26.544403][ T298] kfree+0xc0/0x270 [ 26.548198][ T298] l2tp_session_put+0xb2/0x1a0 [ 26.552950][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 26.558142][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 26.563339][ T298] process_one_work+0x6fd/0xbc0 [ 26.568178][ T298] worker_thread+0xa8e/0x13c0 [ 26.572844][ T298] kthread+0x324/0x3b0 [ 26.576903][ T298] ret_from_fork+0x1f/0x30 [ 26.581304][ T298] [ 26.583626][ T298] The buggy address belongs to the object at ffff8881041e9000 [ 26.583626][ T298] which belongs to the cache kmalloc-512 of size 512 [ 26.597666][ T298] The buggy address is located 0 bytes inside of [ 26.597666][ T298] 512-byte region [ffff8881041e9000, ffff8881041e9200) [ 26.610752][ T298] The buggy address belongs to the page: [ 26.616393][ T298] page:ffffea0004107a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1041e8 [ 26.626623][ T298] head:ffffea0004107a00 order:2 compound_mapcount:0 compound_pincount:0 [ 26.635025][ T298] flags: 0x4000000000010200(slab|head) [ 26.640489][ T298] raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043080 [ 26.649084][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.657651][ T298] page dumped because: kasan: bad access detected [ 26.664057][ T298] page_owner tracks the page as allocated [ 26.669774][ T298] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1985082011, free_ts 0 [ 26.687037][ T298] prep_new_page+0x176/0x190 [ 26.691620][ T298] get_page_from_freelist+0x225f/0x23f0 [ 26.697161][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 26.702524][ T298] new_slab+0x84/0x3f0 [ 26.706583][ T298] ___slab_alloc+0x2f8/0x4c0 [ 26.711169][ T298] __slab_alloc+0x63/0xa0 [ 26.715485][ T298] __kmalloc_track_caller+0x1e4/0x310 [ 26.720844][ T298] pskb_expand_head+0x123/0x11c0 [ 26.725768][ T298] netlink_trim+0x193/0x230 [ 26.730261][ T298] netlink_broadcast_filtered+0x75/0x12c0 [ 26.735981][ T298] netlink_broadcast+0x3a/0x50 [ 26.740737][ T298] genlmsg_multicast_allns+0x23e/0x300 [ 26.746183][ T298] genl_ctrl_event+0x7dc/0xa60 [ 26.750944][ T298] genl_register_family+0xddf/0x1060 [ 26.756235][ T298] nl80211_init+0x18/0x6f [ 26.760559][ T298] cfg80211_init+0x6e/0x121 [ 26.765050][ T298] page_owner free stack trace missing [ 26.770419][ T298] [ 26.772735][ T298] Memory state around the buggy address: [ 26.778360][ T298] ffff8881041e8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.786412][ T298] ffff8881041e8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.794469][ T298] >ffff8881041e9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.802522][ T298] ^ [ 26.806599][ T298] ffff8881041e9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.814649][ T298] ffff8881041e9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.822696][ T298] ================================================================== [ 26.830762][ T298] Disabling lock debugging due to kernel taint [ 26.837210][ T298] ------------[ cut here ]------------ [ 26.842741][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 26.852759][ T24] audit: type=1400 audit(1792890465.640:68): avc: denied { read } for pid=76 comm="syslogd" name="log" dev="sda1" ino=2010 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:var_t tclass=lnk_file permissive=1 [ 26.874430][ T298] Modules linked in: [ 26.878410][ T24] audit: type=1400 audit(1792890465.640:69): avc: denied { search } for pid=76 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.878420][ T298] CPU: 0 PID: 298 Comm: syz-executor258 Tainted: G B syzkaller #0 [ 26.878433][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 26.899718][ T24] audit: type=1400 audit(1792890465.640:70): avc: denied { write } for pid=76 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.909115][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 26.919991][ T24] audit: type=1400 audit(1792890465.640:71): avc: denied { add_name } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.941103][ T298] Code: 5d c3 e8 ec ed 34 fd be 02 00 00 00 eb 0a e8 e0 ed 34 fd be 01 00 00 00 4c 89 f7 e8 63 69 0e fe e9 0f ff ff ff e8 c9 ed 34 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 b8 ed 34 fd 4c 89 f7 be 03 [ 26.947280][ T24] audit: type=1400 audit(1792890465.640:72): avc: denied { create } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 26.967860][ T298] RSP: 0018:ffffc90000b17c40 EFLAGS: 00010293 [ 26.987365][ T24] audit: type=1400 audit(1792890465.640:73): avc: denied { append open } for pid=76 comm="syslogd" path="/tmp/messages" dev="tmpfs" ino=5 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 27.007833][ T298] [ 27.039036][ T298] RAX: ffffffff842fc8f7 RBX: ffff888120112800 RCX: ffff888100f8a800 [ 27.047123][ T298] RDX: 0000000000000000 RSI: 0000000009588780 RDI: 000000000c04eb7d [ 27.055161][ T298] RBP: ffffc90000b17c60 R08: 0000000000000003 R09: 0000000000000004 [ 27.063155][ T298] R10: dffffc0000000000 R11: fffffbfff0dcfa48 R12: dffffc0000000000 [ 27.071172][ T298] R13: dffffc0000000000 R14: 0000000009588780 R15: ffff8881041e9000 [ 27.079186][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 27.088192][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.094797][ T298] CR2: 00007efd94de54f0 CR3: 000000010d623000 CR4: 00000000003506b0 [ 27.102818][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.110818][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.118824][ T298] Call Trace: [ 27.122132][ T298] pppol2tp_release+0x150/0x2b0 [ 27.126988][ T298] sock_close+0xb8/0x200 [ 27.131268][ T298] ? sock_mmap+0xa0/0xa0 [ 27.135534][ T298] __fput+0x2dc/0x730 [ 27.139552][ T298] ____fput+0x15/0x20 [ 27.143543][ T298] task_work_run+0x127/0x190 [ 27.148189][ T298] do_exit+0xa7c/0x24e0 [ 27.152375][ T298] ? __kasan_check_write+0x14/0x20 [ 27.157556][ T298] ? switch_fpu_return+0x19c/0x330 [ 27.162842][ T298] ? put_task_struct+0x90/0x90 [ 27.167643][ T298] ? fpu__clear_all+0x20/0x20 [ 27.172415][ T298] ? __kasan_check_read+0x11/0x20 [ 27.177428][ T298] __x64_sys_exit+0x40/0x40 [ 27.182001][ T298] do_syscall_64+0x31/0x40 [ 27.186448][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.192379][ T298] RIP: 0033:0x7efd94dd3d79 [ 27.196799][ T298] Code: Unable to access opcode bytes at RIP 0x7efd94dd3d4f. [ 27.204226][ T298] RSP: 002b:00007ffe9bd76a78 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 27.212687][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007efd94dd3d79 [ 27.220698][ T298] RDX: 00007efd94de5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 27.228696][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 27.236671]