ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1521959273 <...> rocess permissive=1 [ 14.422030][ T24] audit: type=1400 audit(1792066123.210:63): avc: denied { siginh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.123' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1521959273", ["ci2-android-5-10/syz-executor1521959273"], 0x7fffcd4f9c40 /* 10 vars */) = 0 brk(NULL) = 0x55558db24000 brk(0x55558db24d40) = 0x55558db24d40 arch_prctl(ARCH_SET_FS, 0x55558db243c0) = 0 set_tid_address(0x55558db24690) = 297 set_robust_list(0x55558db246a0, 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-executor1521959273", 4096) = 45 getrandom("\x8e\x36\x42\x1b\x43\x6b\x5c\x3a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558db24d40 brk(0x55558db45d40) = 0x55558db45d40 brk(0x55558db46000) = 0x55558db46000 mprotect(0x7f601ad52000, 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 write(1, "executing program\n", 18) = 18 executing program 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 +++ [ 24.592387][ T24] audit: type=1400 audit(1792066133.400:64): avc: denied { execmem } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.611955][ T24] audit: type=1400 audit(1792066133.410:65): avc: denied { create } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.631992][ T24] audit: type=1400 audit(1792066133.410:66): avc: denied { connect } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.652127][ T24] audit: type=1400 audit(1792066133.420:67): avc: denied { ioctl } for pid=297 comm="syz-executor152" path="socket:[1472]" dev="sockfs" ino=1472 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.782608][ T298] ================================================================== [ 24.790706][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.798751][ T298] Read of size 4 at addr ffff888104de4800 by task syz-executor152/298 [ 24.806946][ T298] [ 24.809302][ T298] CPU: 0 PID: 298 Comm: syz-executor152 Not tainted syzkaller #0 [ 24.816999][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 24.827041][ T298] Call Trace: [ 24.830331][ T298] __dump_stack+0x21/0x24 [ 24.834636][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.839315][ T298] ? show_regs_print_info+0x18/0x18 [ 24.844610][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.849877][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.855070][ T298] print_address_description+0x7f/0x2c0 [ 24.860591][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.866299][ T298] kasan_report+0x100/0x140 [ 24.870792][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.876491][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.882102][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.887621][ T298] pppol2tp_release+0x150/0x2b0 [ 24.892446][ T298] sock_close+0xb8/0x200 [ 24.896749][ T298] ? sock_mmap+0xa0/0xa0 [ 24.900980][ T298] __fput+0x2dc/0x730 [ 24.904938][ T298] ____fput+0x15/0x20 [ 24.908911][ T298] task_work_run+0x127/0x190 [ 24.913477][ T298] do_exit+0xa7c/0x24e0 [ 24.917609][ T298] ? __kasan_check_write+0x14/0x20 [ 24.922691][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.927777][ T298] ? put_task_struct+0x90/0x90 [ 24.932514][ T298] ? fpu__clear_all+0x20/0x20 [ 24.937261][ T298] ? __kasan_check_read+0x11/0x20 [ 24.942365][ T298] __x64_sys_exit+0x40/0x40 [ 24.946946][ T298] do_syscall_64+0x31/0x40 [ 24.951451][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.957335][ T298] RIP: 0033:0x7f601acc1d79 [ 24.961753][ T298] Code: Unable to access opcode bytes at RIP 0x7f601acc1d4f. [ 24.969194][ T298] RSP: 002b:00007ffc5ee39ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 24.977678][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f601acc1d79 [ 24.985633][ T298] RDX: 00007f601acd3557 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.993584][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.001544][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc5ee3a0f8 [ 25.009500][ T298] R13: 0000000000000002 R14: 00007f601ad52ca0 R15: 0000000000000002 [ 25.017453][ T298] [ 25.019759][ T298] Allocated by task 297: [ 25.024108][ T298] __kasan_kmalloc+0xd4/0x100 [ 25.028872][ T298] __kmalloc+0x19f/0x330 [ 25.033107][ T298] l2tp_session_create+0x39/0xb60 [ 25.038110][ T298] pppol2tp_connect+0xbf5/0x1640 [ 25.043034][ T298] __sys_connect+0x3ce/0x450 [ 25.047596][ T298] __x64_sys_connect+0x7a/0x90 [ 25.052334][ T298] do_syscall_64+0x31/0x40 [ 25.056833][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.062705][ T298] [ 25.065013][ T298] Freed by task 7: [ 25.068717][ T298] kasan_set_track+0x4a/0x70 [ 25.073391][ T298] kasan_set_free_info+0x23/0x40 [ 25.078424][ T298] ____kasan_slab_free+0x125/0x160 [ 25.083625][ T298] __kasan_slab_free+0x11/0x20 [ 25.088377][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.093755][ T298] kfree+0xc0/0x270 [ 25.097541][ T298] l2tp_session_put+0xb2/0x1a0 [ 25.102280][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 25.107368][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.112564][ T298] process_one_work+0x6fd/0xbc0 [ 25.117421][ T298] worker_thread+0xa8e/0x13c0 [ 25.122080][ T298] kthread+0x324/0x3b0 [ 25.126155][ T298] ret_from_fork+0x1f/0x30 [ 25.130978][ T298] [ 25.133294][ T298] The buggy address belongs to the object at ffff888104de4800 [ 25.133294][ T298] which belongs to the cache kmalloc-512 of size 512 [ 25.147444][ T298] The buggy address is located 0 bytes inside of [ 25.147444][ T298] 512-byte region [ffff888104de4800, ffff888104de4a00) [ 25.160532][ T298] The buggy address belongs to the page: [ 25.166173][ T298] page:ffffea0004137900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104de4 [ 25.176385][ T298] head:ffffea0004137900 order:2 compound_mapcount:0 compound_pincount:0 [ 25.184771][ T298] flags: 0x4000000000010200(slab|head) [ 25.190301][ T298] raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043080 [ 25.198946][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.207506][ T298] page dumped because: kasan: bad access detected [ 25.213905][ T298] page_owner tracks the page as allocated [ 25.219604][ T298] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1570315362, free_ts 1569543803 [ 25.238432][ T298] prep_new_page+0x176/0x190 [ 25.243021][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.248550][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.254151][ T298] new_slab+0x84/0x3f0 [ 25.258214][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.262796][ T298] __slab_alloc+0x63/0xa0 [ 25.267123][ T298] __kmalloc+0x1f9/0x330 [ 25.271485][ T298] __tty_alloc_driver+0x31f/0x4c0 [ 25.276508][ T298] vty_init+0xea/0x354 [ 25.280550][ T298] tty_init+0x138/0x177 [ 25.284686][ T298] chr_dev_init+0x25e/0x265 [ 25.289267][ T298] do_one_initcall+0x205/0x5e0 [ 25.294004][ T298] do_initcall_level+0x174/0x2dc [ 25.298914][ T298] do_initcalls+0x50/0x92 [ 25.303219][ T298] do_basic_setup+0x88/0x8f [ 25.307693][ T298] kernel_init_freeable+0x28c/0x3c3 [ 25.312859][ T298] page last free stack trace: [ 25.317513][ T298] __free_pages_ok+0x80b/0x830 [ 25.322268][ T298] __free_pages+0xd8/0x390 [ 25.326681][ T298] free_pages+0x82/0x90 [ 25.330830][ T298] __stack_depot_save+0x492/0x4c0 [ 25.335841][ T298] kasan_set_track+0x5b/0x70 [ 25.340410][ T298] kasan_set_free_info+0x23/0x40 [ 25.345326][ T298] ____kasan_slab_free+0x125/0x160 [ 25.350408][ T298] __kasan_slab_free+0x11/0x20 [ 25.355148][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.360494][ T298] kfree+0xc0/0x270 [ 25.364287][ T298] cleanup_uevent_env+0x38/0x40 [ 25.369142][ T298] call_usermodehelper_exec+0x16b/0x490 [ 25.374677][ T298] kobject_uevent_env+0x659/0x700 [ 25.379688][ T298] kobject_uevent+0x1d/0x30 [ 25.384175][ T298] device_add+0x7d2/0xc00 [ 25.388566][ T298] device_create+0x26c/0x300 [ 25.393125][ T298] [ 25.395451][ T298] Memory state around the buggy address: [ 25.401052][ T298] ffff888104de4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.409101][ T298] ffff888104de4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.417152][ T298] >ffff888104de4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.425188][ T298] ^ [ 25.429234][ T298] ffff888104de4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.437273][ T298] ffff888104de4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.445317][ T298] ================================================================== [ 25.453349][ T298] Disabling lock debugging due to kernel taint [ 25.459750][ T298] ------------[ cut here ]------------ [ 25.464470][ T24] audit: type=1400 audit(1792066134.270:68): avc: denied { read } for pid=77 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 [ 25.465347][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.486947][ T24] audit: type=1400 audit(1792066134.270:69): avc: denied { search } for pid=77 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 [ 25.497146][ T298] Modules linked in: [ 25.518295][ T24] audit: type=1400 audit(1792066134.270:70): avc: denied { write } for pid=77 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 [ 25.518341][ T298] [ 25.522385][ T24] audit: type=1400 audit(1792066134.270:71): avc: denied { add_name } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 25.543624][ T298] CPU: 0 PID: 298 Comm: syz-executor152 Tainted: G B syzkaller #0 [ 25.545710][ T24] audit: type=1400 audit(1792066134.270:72): avc: denied { create } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 25.566225][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 25.566251][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.575566][ T24] audit: type=1400 audit(1792066134.270:73): avc: denied { append open } for pid=77 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 [ 25.595750][ T298] Code: 5d c3 e8 cc f7 34 fd be 02 00 00 00 eb 0a e8 c0 f7 34 fd be 01 00 00 00 4c 89 f7 e8 43 73 0e fe e9 0f ff ff ff e8 a9 f7 34 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 98 f7 34 fd 4c 89 f7 be 03 [ 25.654481][ T298] RSP: 0018:ffffc90000b47c40 EFLAGS: 00010293 [ 25.660541][ T298] RAX: ffffffff842fbf17 RBX: ffff88811c2c2000 RCX: ffff88811b716400 [ 25.668562][ T298] RDX: 0000000000000000 RSI: 000000001edea500 RDI: 000000000c04eb7d [ 25.676632][ T298] RBP: ffffc90000b47c60 R08: 0000000000000003 R09: 0000000000000004 [ 25.684610][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 25.692766][ T298] R13: dffffc0000000000 R14: 000000001edea500 R15: ffff888104de4800 [ 25.700719][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 25.709661][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.716256][ T298] CR2: 00007f601acd34f0 CR3: 000000010d550000 CR4: 00000000003506b0 [ 25.724339][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.732418][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.740382][ T298] Call Trace: [ 25.743698][ T298] pppol2tp_release+0x150/0x2b0 [ 25.748555][ T298] sock_close+0xb8/0x200 [ 25.752816][ T298] ? sock_mmap+0xa0/0xa0 [ 25.757058][ T298] __fput+0x2dc/0x730 [ 25.761024][ T298] ____fput+0x15/0x20 [ 25.765013][ T298] task_work_run+0x127/0x190 [ 25.769595][ T298] do_exit+0xa7c/0x24e0 [ 25.773856][ T298] ? __kasan_check_write+0x14/0x20 [ 25.779058][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.784181][ T298] ? put_task_struct+0x90/0x90 [ 25.789108][ T298] ? fpu__clear_all+0x20/0x20 [ 25.793798][ T298] ? __kasan_check_read+0x11/0x20 [ 25.798812][ T298] __x64_sys_exit+0x40/0x40 [ 25.803324][ T298] do_syscall_64+0x31/0x40 [ 25.807728][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.813635][ T298] RIP: 0033:0x7f601acc1d79 [ 25.818145][ T298] Code: Unable to access opcode bytes at RIP 0x7f601acc1d4f. [ 25.825518][ T298] RSP: 002b:00007ffc5ee39ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.833935][ T298] RAX: ffffffff