./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4101933569 <...> Warning: Permanently added '10.128.1.7' (ED25519) to the list of known hosts. execve("./syz-executor4101933569", ["./syz-executor4101933569"], 0x7fff06749ea0 /* 10 vars */) = 0 brk(NULL) = 0x55556e68c000 brk(0x55556e68cd00) = 0x55556e68cd00 arch_prctl(ARCH_SET_FS, 0x55556e68c380) = 0 set_tid_address(0x55556e68c650) = 295 set_robust_list(0x55556e68c660, 24) = 0 rseq(0x55556e68cca0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4101933569", 4096) = 28 getrandom("\x2c\xb5\x21\x85\x39\x9a\x50\xef", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556e68cd00 brk(0x55556e6add00) = 0x55556e6add00 brk(0x55556e6ae000) = 0x55556e6ae000 mprotect(0x7f13e2290000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 write(1, "executing program\n", 18executing program ) = 18 socket(AF_NETLINK, SOCK_RAW|SOCK_NONBLOCK, NETLINK_ROUTE) = 3 openat(AT_FDCWD, "/dev/net/tun", O_RDONLY) = 4 ioctl(4, TUNSETIFF, 0x20000040) = 0 socket(AF_NETLINK, SOCK_RAW, 0) = 5 socket(AF_UNIX, SOCK_STREAM, 0) = 6 ioctl(6, SIOCGIFINDEX, {ifr_name="syzkaller0", ifr_ifindex=15}) = 0 sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x38\x00\x00\x00\x24\x00\x41\x65\x2a\xbd\x70\x00\xff\xff\xff\xff\x00\x00\x00\x00\x0f\x00\x00\x00\x00\x00\xf1\xff\xff\xff\xff\xff\x00\x00\x00\x00\x0b\x00\x01\x00\x6d\x75\x6c\x74\x69\x71\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00", iov_len=56}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 56 [ 23.390886][ T30] audit: type=1400 audit(1736059383.011:66): avc: denied { execmem } for pid=295 comm="syz-executor410" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.399671][ T295] ================================================================== [ 23.418061][ T295] BUG: KASAN: slab-out-of-bounds in tc_setup_flow_action+0xb9d/0x3430 [ 23.426148][ T295] Read of size 8 at addr ffff88810c6b21c0 by task syz-executor410/295 [ 23.434127][ T295] [ 23.436296][ T295] CPU: 1 PID: 295 Comm: syz-executor410 Not tainted 5.15.173-syzkaller-00213-gaf461d0249a8 #0 [ 23.438317][ T30] audit: type=1400 audit(1736059383.051:67): avc: denied { read } for pid=139 comm="dhcpcd" scontext=system_u:system_r:dhcpc_t tcontext=system_u:system_r:dhcpc_t tclass=netlink_kobject_uevent_socket permissive=1 [ 23.446361][ T295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 23.476925][ T295] Call Trace: [ 23.480038][ T295] [ 23.482817][ T295] dump_stack_lvl+0x151/0x1c0 [ 23.487329][ T295] ? io_uring_drop_tctx_refs+0x190/0x190 [ 23.492808][ T295] ? panic+0x760/0x760 [ 23.496704][ T295] print_address_description+0x87/0x3b0 [ 23.502083][ T295] kasan_report+0x179/0x1c0 [ 23.506422][ T295] ? tc_setup_flow_action+0xb9d/0x3430 [ 23.511716][ T295] ? tc_setup_flow_action+0xb9d/0x3430 [ 23.517012][ T295] __asan_report_load8_noabort+0x14/0x20 [ 23.522483][ T295] tc_setup_flow_action+0xb9d/0x3430 [ 23.527603][ T295] mall_replace_hw_filter+0x394/0xc20 [ 23.532898][ T295] ? mall_set_parms+0x4b0/0x4b0 [ 23.537841][ T295] ? tcf_exts_destroy+0xb0/0xb0 [ 23.542528][ T295] ? pcpu_memcg_post_alloc_hook+0x1b1/0x260 [ 23.548267][ T295] ? pcpu_alloc+0xda0/0x13e0 [ 23.552686][ T295] ? mall_set_parms+0x1c3/0x4b0 [ 23.557372][ T295] mall_change+0x56e/0x780 [ 23.561625][ T295] ? mall_get+0xb0/0xb0 [ 23.565616][ T295] ? tcf_chain_tp_insert_unique+0xa90/0xbb0 [ 23.571345][ T295] ? nla_strcmp+0xed/0x120 [ 23.575595][ T295] ? mall_get+0xb0/0xb0 [ 23.579592][ T295] tc_new_tfilter+0x151a/0x1c00 [ 23.584281][ T295] ? tcf_gate_entry_destructor+0x20/0x20 [ 23.589747][ T295] ? security_capable+0x87/0xb0 [ 23.594430][ T295] ? ns_capable+0x89/0xe0 [ 23.598599][ T295] ? netlink_net_capable+0x125/0x160 [ 23.603720][ T295] ? tcf_gate_entry_destructor+0x20/0x20 [ 23.609184][ T295] rtnetlink_rcv_msg+0x776/0xc40 [ 23.613958][ T295] ? rtnetlink_bind+0x80/0x80 [ 23.618481][ T295] ? stack_trace_save+0x1c0/0x1c0 [ 23.623333][ T295] ? __kernel_text_address+0x9b/0x110 [ 23.628541][ T295] ? unwind_get_return_address+0x4d/0x90 [ 23.634007][ T295] ? avc_has_perm_noaudit+0x348/0x430 [ 23.639221][ T295] ? memcpy+0x56/0x70 [ 23.643034][ T295] ? avc_has_perm_noaudit+0x2dd/0x430 [ 23.648244][ T295] ? avc_denied+0x1b0/0x1b0 [ 23.652584][ T295] ? avc_has_perm+0x16f/0x260 [ 23.657096][ T295] ? ____kasan_kmalloc+0xed/0x110 [ 23.661958][ T295] ? avc_has_perm_noaudit+0x430/0x430 [ 23.667174][ T295] ? x64_sys_call+0x16a/0x9a0 [ 23.671676][ T295] netlink_rcv_skb+0x1cf/0x410 [ 23.676278][ T295] ? rtnetlink_bind+0x80/0x80 [ 23.680791][ T295] ? netlink_ack+0xb10/0xb10 [ 23.685219][ T295] ? __netlink_lookup+0x37b/0x3a0 [ 23.690076][ T295] rtnetlink_rcv+0x1c/0x20 [ 23.694331][ T295] netlink_unicast+0x8df/0xac0 [ 23.698933][ T295] ? netlink_detachskb+0x90/0x90 [ 23.703719][ T295] ? security_netlink_send+0x7b/0xa0 [ 23.708827][ T295] netlink_sendmsg+0xa0a/0xd20 [ 23.713426][ T295] ? netlink_getsockopt+0x560/0x560 [ 23.718459][ T295] ? security_socket_sendmsg+0x82/0xb0 [ 23.723756][ T295] ? netlink_getsockopt+0x560/0x560 [ 23.728791][ T295] ____sys_sendmsg+0x59e/0x8f0 [ 23.733387][ T295] ? __sys_sendmsg_sock+0x40/0x40 [ 23.738248][ T295] ? import_iovec+0xe5/0x120 [ 23.742676][ T295] ___sys_sendmsg+0x252/0x2e0 [ 23.747188][ T295] ? __sys_sendmsg+0x260/0x260 [ 23.751803][ T295] ? cgroup_leave_frozen+0x164/0x2c0 [ 23.756907][ T295] ? __kasan_check_read+0x11/0x20 [ 23.761766][ T295] ? __fdget+0x179/0x240 [ 23.765849][ T295] __se_sys_sendmsg+0x19a/0x260 [ 23.770539][ T295] ? __x64_sys_sendmsg+0x90/0x90 [ 23.775311][ T295] ? ptrace_notify+0x24c/0x350 [ 23.779913][ T295] ? __kasan_check_write+0x14/0x20 [ 23.784854][ T295] __x64_sys_sendmsg+0x7b/0x90 [ 23.789456][ T295] x64_sys_call+0x16a/0x9a0 [ 23.793795][ T295] do_syscall_64+0x3b/0xb0 [ 23.798047][ T295] ? clear_bhb_loop+0x35/0x90 [ 23.802564][ T295] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 23.808305][ T295] RIP: 0033:0x7f13e221d829 [ 23.812544][ T295] Code: 48 83 c4 28 c3 e8 37 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 23.832336][ T295] RSP: 002b:00007ffc49c16eb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 23.840665][ T295] RAX: ffffffffffffffda RBX: 00007ffc49c17088 RCX: 00007f13e221d829 [ 23.848475][ T295] RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003 [ 23.856284][ T295] RBP: 00007f13e2290610 R08: 0000000000000001 R09: 00007ffc49c17088 [ 23.864097][ T295] R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001 [ 23.872351][ T295] R13: 00007ffc49c17078 R14: 0000000000000001 R15: 0000000000000001 [ 23.880167][ T295] [ 23.883019][ T295] [ 23.885187][ T295] Allocated by task 295: [ 23.889269][ T295] ____kasan_kmalloc+0xdb/0x110 [ 23.893962][ T295] __kasan_kmalloc+0x9/0x10 [ 23.898293][ T295] __kmalloc+0x13f/0x2c0 [ 23.902375][ T295] tcf_idr_create+0x5f/0x780 [ 23.906801][ T295] tcf_idr_create_from_flags+0x5f/0x70 [ 23.912092][ T295] tcf_gact_init+0x3cd/0x6e0 [ 23.916518][ T295] tcf_action_init_1+0x50f/0x7f0 [ 23.921292][ T295] tcf_action_init+0x306/0x840 [ 23.925893][ T295] tcf_exts_validate+0x236/0x520 [ 23.930666][ T295] mall_set_parms+0x44/0x4b0 [ 23.935091][ T295] mall_change+0x495/0x780 [ 23.939345][ T295] tc_new_tfilter+0x151a/0x1c00 [ 23.944034][ T295] rtnetlink_rcv_msg+0x776/0xc40 [ 23.948816][ T295] netlink_rcv_skb+0x1cf/0x410 [ 23.953432][ T295] rtnetlink_rcv+0x1c/0x20 [ 23.957664][ T295] netlink_unicast+0x8df/0xac0 [ 23.962260][ T295] netlink_sendmsg+0xa0a/0xd20 [ 23.966861][ T295] ____sys_sendmsg+0x59e/0x8f0 [ 23.971460][ T295] ___sys_sendmsg+0x252/0x2e0 [ 23.975973][ T295] __se_sys_sendmsg+0x19a/0x260 [ 23.980662][ T295] __x64_sys_sendmsg+0x7b/0x90 [ 23.985261][ T295] x64_sys_call+0x16a/0x9a0 [ 23.989601][ T295] do_syscall_64+0x3b/0xb0 [ 23.993853][ T295] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 23.999582][ T295] [ 24.001750][ T295] The buggy address belongs to the object at ffff88810c6b2100 [ 24.001750][ T295] which belongs to the cache kmalloc-192 of size 192 [ 24.015638][ T295] The buggy address is located 0 bytes to the right of [ 24.015638][ T295] 192-byte region [ffff88810c6b2100, ffff88810c6b21c0) [ 24.029100][ T295] The buggy address belongs to the page: [ 24.034569][ T295] page:ffffea000431ac80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c6b2 [ 24.044625][ T295] flags: 0x4000000000000200(slab|zone=1) [ 24.050102][ T295] raw: 4000000000000200 ffffea00042bb1c0 0000000b0000000b ffff888100042c00 [ 24.058530][ T295] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.066932][ T295] page dumped because: kasan: bad access detected [ 24.073194][ T295] page_owner tracks the page as allocated [ 24.078738][ T295] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 71, ts 3975167948, free_ts 0 [ 24.093576][ T295] post_alloc_hook+0x1a3/0x1b0 [ 24.098177][ T295] prep_new_page+0x1b/0x110 [ 24.102514][ T295] get_page_from_freelist+0x3550/0x35d0 [ 24.107985][ T295] __alloc_pages+0x27e/0x8f0 [ 24.112417][ T295] new_slab+0x9a/0x4e0 [ 24.116316][ T295] ___slab_alloc+0x39e/0x830 [ 24.120747][ T295] __slab_alloc+0x4a/0x90 [ 24.124910][ T295] kmem_cache_alloc_trace+0x147/0x270 [ 24.130117][ T295] alloc_fs_context+0x65/0x830 [ 24.134717][ T295] fs_context_for_mount+0x24/0x30 [ 24.139576][ T295] do_new_mount+0x15c/0xb30 [ 24.143915][ T295] path_mount+0x671/0x1070 [ 24.148168][ T295] __se_sys_mount+0x2c4/0x3b0 [ 24.152681][ T295] __x64_sys_mount+0xbf/0xd0 [ 24.157110][ T295] x64_sys_call+0x49d/0x9a0 [ 24.161449][ T295] do_syscall_64+0x3b/0xb0 [ 24.165702][ T295] page_owner free stack trace missing [ 24.170912][ T295] [ 24.173078][ T295] Memory state around the buggy address: [ 24.178551][ T295] ffff88810c6b2080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 24.186447][ T295] ffff88810c6b2100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x84\x00\x00\x00\x2c\x00\x27\x0d\x29\xbd\x30\x00\x02\x00\x00\x00\x00\x00\x00\x00\x0f\x00\x00\x00\x00\x00\x0f\x00\x00\x00\x00\x00\x07\x00\x00\x00\x0d\x00\x01\x00\x6d\x61\x74\x63\x68\x61\x6c\x6c\x00\x00\x00\x00\x50\x00\x02\x00\x4c\x00\x02\x00\x48\x00\x01\x00\x09\x00\x01\x00\x67\x61\x63\x74\x00\x00\x00\x00\x1c\x00\x02\x80\x18\x00\x02\x00\x40\x00\x00\x00\x00\x04\x00\x00\x05\x00\x00\x00\x80\x00\x00\x00"..., iov_len=132}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_PROBE}, 0) = 132 exit_group(0) = ? [ 24.194345][ T295] >ffff88810c6b2180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 24.202242][ T295] ^ [ 24.208239][ T295] ffff88810c6b2200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 24.216131][ T295] ffff88810c6b2280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc [ 24.224025][ T295] ================================================================== [ 24.231930][ T295] Disabling lock debugging due to kernel taint +++ exited with 0 +++