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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com Subject: [BUG] KFENCE: use-after-free read in udp_tunnel_nic_device_sync_work Date: Wed, 24 Jun 2026 17:01:32 +0800 Message-ID: <20260624090135.95763-1-samsun1006219@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello, I hit a reproducible use-after-free in the UDP tunnel NIC offload work item. The original local crash was reported by KFENCE as: KFENCE: use-after-free read in udp_tunnel_nic_device_sync_work On current mainline, the C reproducer below triggers the same lifetime bug, reported by KASAN before KFENCE samples the object: BUG: KASAN: slab-use-after-free in __mutex_lock Workqueue: udp_tunnel_nic udp_tunnel_nic_device_sync_work Tested kernel: 840ef6c78e6a ("Merge tag 'nfs-for-7.2-1' of git://git.linux-nfs.org/projects/anna/linux-nfs") Linux 7.1.0-11240-g840ef6c78e6a #31 SMP PREEMPT_DYNAMIC Related syzbot reports: https://syzkaller.appspot.com/bug?id=8d8fd27ae4339074afe3f456be73b2030d795256 The dashboard currently marks it as invalid, but the same issue is still reproducible for me on current mainline with the C reproducer pasted below. Crash stack from the latest C reproducer run: [ 131.757233][ T12] BUG: KASAN: slab-use-after-free in __mutex_lock+0x16d0/0x1d80 [ 131.759738][ T12] Read of size 8 at addr ff11000065dcd2a8 by task kworker/u16:0/12 [ 131.762204][ T12] [ 131.762956][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 7.1.0-11240-g840ef6c78e6a #31 PREEMPT(full) [ 131.762997][ T12] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 131.763020][ T12] Workqueue: udp_tunnel_nic udp_tunnel_nic_device_sync_work [ 131.763064][ T12] Call Trace: [ 131.763076][ T12] [ 131.763089][ T12] dump_stack_lvl+0x116/0x1b0 [ 131.763136][ T12] print_report+0xf1/0x5c0 [ 131.763178][ T12] ? __virt_addr_valid+0x238/0x420 [ 131.763214][ T12] ? __mutex_lock+0x16d0/0x1d80 [ 131.763264][ T12] kasan_report+0xca/0x100 [ 131.763301][ T12] ? __mutex_lock+0x16d0/0x1d80 [ 131.763345][ T12] __mutex_lock+0x16d0/0x1d80 [ 131.763383][ T12] ? udp_tunnel_nic_device_sync_work+0x32/0x9c0 [ 131.763438][ T12] ? __pfx___mutex_lock+0x10/0x10 [ 131.763487][ T12] ? debug_object_deactivate+0x213/0x390 [ 131.763551][ T12] ? udp_tunnel_nic_device_sync_work+0x32/0x9c0 [ 131.763587][ T12] udp_tunnel_nic_device_sync_work+0x32/0x9c0 [ 131.763633][ T12] process_one_work+0x9de/0x1bf0 [ 131.763670][ T12] ? __pfx_udp_tunnel_nic_device_sync_work+0x10/0x10 [ 131.763710][ T12] ? __pfx_process_one_work+0x10/0x10 [ 131.763747][ T12] ? __pfx_udp_tunnel_nic_device_sync_work+0x10/0x10 [ 131.763787][ T12] worker_thread+0x693/0xeb0 [ 131.763823][ T12] ? __pfx_worker_thread+0x10/0x10 [ 131.763855][ T12] kthread+0x38d/0x4a0 [ 131.763903][ T12] ? __pfx_kthread+0x10/0x10 [ 131.763953][ T12] ret_from_fork+0xb09/0xdb0 [ 131.763997][ T12] ? __pfx_ret_from_fork+0x10/0x10 [ 131.764037][ T12] ? __pfx_kthread+0x10/0x10 [ 131.764082][ T12] ? kthread_affine_node+0x210/0x230 [ 131.764131][ T12] ? __switch_to+0x7a7/0x10e0 [ 131.764174][ T12] ? __pfx_kthread+0x10/0x10 [ 131.764221][ T12] ret_from_fork_asm+0x1a/0x30 [ 131.764269][ T12] [ 131.764280][ T12] [ 131.810468][ T12] Allocated by task 10356: [ 131.811305][ T12] kasan_save_stack+0x24/0x50 [ 131.812187][ T12] kasan_save_track+0x14/0x30 [ 131.813069][ T12] __kasan_kmalloc+0xaa/0xb0 [ 131.813959][ T12] __kmalloc_noprof+0x345/0x7f0 [ 131.814882][ T12] udp_tunnel_nic_netdevice_event+0x1285/0x1de0 [ 131.816061][ T12] notifier_call_chain+0xbd/0x430 [ 131.817014][ T12] call_netdevice_notifiers_info+0xbe/0x110 [ 131.819862][ T12] register_netdevice+0x197c/0x2440 [ 131.820868][ T12] nsim_create+0xcd5/0x14b0 [ 131.821733][ T12] __nsim_dev_port_add+0x3c2/0x900 [ 131.822701][ T12] nsim_dev_reload_up+0x42c/0x6a0 [ 131.823584][ T12] devlink_reload+0x2e3/0x7b0 [ 131.824421][ T12] devlink_nl_reload_doit+0x541/0x1160 [ 131.825385][ T12] genl_family_rcv_msg_doit+0x1ff/0x2f0 [ 131.826358][ T12] genl_rcv_msg+0x532/0x7e0 [ 131.827159][ T12] netlink_rcv_skb+0x147/0x430 [ 131.828017][ T12] genl_rcv+0x28/0x40 [ 131.828724][ T12] netlink_unicast+0x58d/0x850 [ 131.829582][ T12] netlink_sendmsg+0x88d/0xd90 [ 131.830439][ T12] ____sys_sendmsg+0xa27/0xb90 [ 131.831286][ T12] ___sys_sendmsg+0x11c/0x1b0 [ 131.832106][ T12] __sys_sendmsg+0x142/0x1f0 [ 131.832927][ T12] do_syscall_64+0x11f/0x860 [ 131.833745][ T12] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 131.834791][ T12] [ 131.835206][ T12] Freed by task 10421: [ 131.835916][ T12] kasan_save_stack+0x24/0x50 [ 131.836742][ T12] kasan_save_track+0x14/0x30 [ 131.837564][ T12] kasan_save_free_info+0x3b/0x60 [ 131.838465][ T12] __kasan_slab_free+0x61/0x80 [ 131.839314][ T12] kfree+0x2ca/0x6d0 [ 131.840008][ T12] udp_tunnel_nic_netdevice_event+0xc24/0x1de0 [ 131.841080][ T12] notifier_call_chain+0xbd/0x430 [ 131.841981][ T12] call_netdevice_notifiers_info+0xbe/0x110 [ 131.843022][ T12] unregister_netdevice_many_notify+0xbab/0x2130 [ 131.844129][ T12] unregister_netdevice_queue+0x305/0x3c0 [ 131.845132][ T12] nsim_destroy+0x231/0x980 [ 131.845960][ T12] __nsim_dev_port_del+0x197/0x2c0 [ 131.846860][ T12] nsim_dev_reload_destroy+0x105/0x490 [ 131.847823][ T12] nsim_dev_reload_down+0x67/0xd0 [ 131.848707][ T12] devlink_reload+0x197/0x7b0 [ 131.849545][ T12] devlink_nl_reload_doit+0x541/0x1160 [ 131.850517][ T12] genl_family_rcv_msg_doit+0x1ff/0x2f0 [ 131.851489][ T12] genl_rcv_msg+0x532/0x7e0 [ 131.852282][ T12] netlink_rcv_skb+0x147/0x430 [ 131.853130][ T12] genl_rcv+0x28/0x40 [ 131.853836][ T12] netlink_unicast+0x58d/0x850 [ 131.854689][ T12] netlink_sendmsg+0x88d/0xd90 [ 131.855497][ T12] ____sys_sendmsg+0xa27/0xb90 [ 131.856293][ T12] ___sys_sendmsg+0x11c/0x1b0 [ 131.857067][ T12] __sys_sendmsg+0x142/0x1f0 [ 131.857826][ T12] do_syscall_64+0x11f/0x860 [ 131.858605][ T12] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 131.859579][ T12] [ 131.859971][ T12] Last potentially related work creation: [ 131.860910][ T12] kasan_save_stack+0x24/0x50 [ 131.861694][ T12] kasan_record_aux_stack+0xa7/0xc0 [ 131.862563][ T12] insert_work+0x36/0x230 [ 131.863276][ T12] __queue_work+0x474/0x12a0 [ 131.864038][ T12] queue_work_on+0x11c/0x140 [ 131.864800][ T12] __udp_tunnel_nic_del_port+0x2a5/0x350 [ 131.865733][ T12] udp_tunnel_notify_del_rx_port+0x228/0x410 [ 131.866698][ T12] __geneve_sock_release.part.0+0x13b/0x1d0 [ 131.867583][ T12] geneve_sock_release+0x165/0x2c0 [ 131.868346][ T12] geneve_stop+0x19c/0x200 [ 131.869001][ T12] __dev_close_many+0x350/0x720 [ 131.869733][ T12] __dev_change_flags+0x301/0x860 [ 131.870474][ T12] netif_change_flags+0x8e/0x170 [ 131.871208][ T12] do_setlink.constprop.0+0xac0/0x3f80 [ 131.872011][ T12] rtnl_newlink+0x17e7/0x1f30 [ 131.872711][ T12] rtnetlink_rcv_msg+0x9e8/0xfa0 [ 131.873455][ T12] netlink_rcv_skb+0x147/0x430 [ 131.874207][ T12] netlink_unicast+0x58d/0x850 [ 131.874959][ T12] netlink_sendmsg+0x88d/0xd90 [ 131.875685][ T12] ____sys_sendmsg+0xa27/0xb90 [ 131.876406][ T12] ___sys_sendmsg+0x11c/0x1b0 [ 131.877102][ T12] __sys_sendmsg+0x142/0x1f0 [ 131.877803][ T12] do_syscall_64+0x11f/0x860 [ 131.878505][ T12] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 131.879297][ T12] [ 131.879611][ T12] Second to last potentially related work creation: [ 131.880480][ T12] kasan_save_stack+0x24/0x50 [ 131.881112][ T12] kasan_record_aux_stack+0xa7/0xc0 [ 131.881818][ T12] insert_work+0x36/0x230 [ 131.882403][ T12] __queue_work+0x474/0x12a0 [ 131.883019][ T12] queue_work_on+0x11c/0x140 [ 131.883634][ T12] __udp_tunnel_nic_add_port+0x6e4/0xd90 [ 131.884385][ T12] udp_tunnel_notify_add_rx_port+0x228/0x410 [ 131.885199][ T12] geneve_sock_add+0x7a3/0xb60 [ 131.885844][ T12] geneve_open+0xde/0x1d0 [ 131.886435][ T12] __dev_open+0x3b8/0x900 [ 131.887017][ T12] __dev_change_flags+0x58f/0x860 [ 131.887692][ T12] netif_change_flags+0x8e/0x170 [ 131.888389][ T12] do_setlink.constprop.0+0xac0/0x3f80 [ 131.889130][ T12] rtnl_newlink+0x17e7/0x1f30 [ 131.889774][ T12] rtnetlink_rcv_msg+0x9e8/0xfa0 [ 131.890455][ T12] netlink_rcv_skb+0x147/0x430 [ 131.891065][ T12] netlink_unicast+0x58d/0x850 [ 131.891654][ T12] netlink_sendmsg+0x88d/0xd90 [ 131.892251][ T12] ____sys_sendmsg+0xa27/0xb90 [ 131.892837][ T12] ___sys_sendmsg+0x11c/0x1b0 [ 131.893412][ T12] __sys_sendmsg+0x142/0x1f0 [ 131.893988][ T12] do_syscall_64+0x11f/0x860 [ 131.894559][ T12] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 131.895275][ T12] [ 131.895564][ T12] The buggy address belongs to the object at ff11000065dcd200 [ 131.895564][ T12] which belongs to the cache kmalloc-256 of size 256 [ 131.897253][ T12] The buggy address is located 168 bytes inside of [ 131.897253][ T12] freed 256-byte region [ff11000065dcd200, ff11000065dcd300) [ 131.898932][ T12] [ 131.899228][ T12] The buggy address belongs to the physical page: [ 131.900013][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x65dcc [ 131.901089][ T12] head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 131.902125][ T12] flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) [ 131.903017][ T12] page_type: f5(slab) [ 131.903477][ T12] raw: 00fff00000000040 ff11000100038b40 dead000000000100 dead000000000122 [ 131.904457][ T12] raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 [ 131.905422][ T12] head: 00fff00000000040 ff11000100038b40 dead000000000100 dead000000000122 [ 131.906405][ T12] head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 [ 131.907388][ T12] head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff [ 131.908365][ T12] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 [ 131.909334][ T12] page dumped because: kasan: bad access detected [ 131.910076][ T12] page_owner tracks the page as allocated [ 131.910720][ T12] page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9905, tgid 9901 (repro), ts 81743543441, free_ts 81726980842 [ 131.913040][ T12] post_alloc_hook+0xff/0x130 [ 131.913579][ T12] get_page_from_freelist+0xe82/0x2bf0 [ 131.914216][ T12] __alloc_frozen_pages_noprof+0x27b/0x2a00 [ 131.914849][ T12] new_slab+0xad/0x610 [ 131.915190][ T12] refill_objects+0x10e/0x3d0 [ 131.915587][ T12] __pcs_replace_empty_main+0x352/0x670 [ 131.916050][ T12] __kmalloc_noprof+0x65e/0x7f0 [ 131.916458][ T12] ops_init+0x77/0x5f0 [ 131.916799][ T12] setup_net+0x11a/0x3a0 [ 131.917155][ T12] copy_net_ns+0x351/0x7c0 [ 131.917530][ T12] create_new_namespaces+0x3f6/0xac0 [ 131.917984][ T12] copy_namespaces+0x45c/0x580 [ 131.918389][ T12] copy_process+0x3687/0x7d40 [ 131.918788][ T12] kernel_clone+0x1f6/0x910 [ 131.919183][ T12] __do_sys_clone+0xce/0x120 [ 131.919575][ T12] do_syscall_64+0x11f/0x860 [ 131.919969][ T12] page last free pid 9905 tgid 9901 stack trace: [ 131.920496][ T12] __free_frozen_pages+0x74d/0x1110 [ 131.920930][ T12] qlist_free_all+0x4c/0xf0 [ 131.921327][ T12] kasan_quarantine_reduce+0x195/0x1e0 [ 131.921791][ T12] __kasan_slab_alloc+0x67/0x90 [ 131.922202][ T12] kmem_cache_alloc_noprof+0x244/0x690 [ 131.922665][ T12] security_inode_alloc+0x3e/0x2d0 [ 131.923099][ T12] inode_init_always_gfp+0xc77/0xfb0 [ 131.923562][ T12] alloc_inode+0x8e/0x250 [ 131.923930][ T12] new_inode+0x22/0x1d0 [ 131.924284][ T12] __debugfs_create_file+0x10b/0x540 [ 131.924737][ T12] debugfs_create_file_full+0x41/0x60 [ 131.925189][ T12] ref_tracker_dir_debugfs+0x18c/0x2e0 [ 131.925658][ T12] alloc_netdev_mqs+0x31f/0x1600 [ 131.926078][ T12] ip6_tnl_init_net+0x12f/0x4c0 [ 131.926491][ T12] ops_init+0x1e2/0x5f0 [ 131.926843][ T12] setup_net+0x11a/0x3a0 [ 131.927201][ T12] [ 131.927399][ T12] Memory state around the buggy address: [ 131.927873][ T12] ff11000065dcd180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 131.928542][ T12] ff11000065dcd200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 131.929231][ T12] >ff11000065dcd280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 131.929902][ T12] ^ [ 131.930375][ T12] ff11000065dcd300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 131.931050][ T12] ff11000065dcd380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 131.931723][ T12] ================================================================== [ 131.932651][ T12] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 131.933267][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 7.1.0-11240-g840ef6c78e6a #31 PREEMPT(full) [ 131.934181][ T12] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 131.934965][ T12] Workqueue: udp_tunnel_nic udp_tunnel_nic_device_sync_work [ 131.935585][ T12] Call Trace: [ 131.935865][ T12] The reproducer creates netdevsim/geneve devices and drives a devlink reload while UDP tunnel offload notifications are being queued. A queued udp_tunnel_nic_device_sync_work item later runs with its embedded work_struct inside struct udp_tunnel_nic, but that struct has already been freed from the NETDEV_UNREGISTER path. The first dereference in the worker is the mutex lock: udp_tunnel_nic_device_sync_work() rtnl_lock(); mutex_lock(&utn->lock); KASAN reports the read from the freed object at that mutex access. Possible root cause analysis: The lifetime of struct udp_tunnel_nic appears to be guarded only by the utn->work_pending flag, but that flag is not a safe lifetime barrier for the queued work: udp_tunnel_nic_device_sync() queue_work(udp_tunnel_nic_workqueue, &utn->work); utn->work_pending = 1; udp_tunnel_nic_unregister() udp_tunnel_nic_flush(dev, utn); udp_tunnel_nic_unlock(dev); if (utn->work_pending) return; udp_tunnel_nic_free(utn); The work is queued before work_pending is set, so unregister can observe work_pending == 0 and free utn while the work is already queued or starting. Also, work_pending is only a flag in the object being protected; it is not a reference, cancel_work_sync(), or flush_work() style guarantee that the worker no longer owns or can dereference the containing object. Once udp_tunnel_nic_free() runs, the embedded work item can still call container_of(work, struct udp_tunnel_nic, work) and dereference the freed utn, which matches the alloc/free/use stacks above. A fix should make unregister synchronize with the embedded work or otherwise hold a real lifetime reference while the work is queued/running. In particular, freeing utn based solely on work_pending looks racy. If you have any questions, please let me know. Best regards, Yue Build/run: gcc -pthread -static -O2 repro.c -o repro ./repro C reproducer: // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } #define BITMASK(bf_off,bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type,htobe,addr,val,bf_off,bf_len) *(type*)(addr) = htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } struct nlmsg { char* pos; int nesting; struct nlattr* nested[8]; char buf[4096]; }; static void netlink_init(struct nlmsg* nlmsg, int typ, int flags, const void* data, int size) { memset(nlmsg, 0, sizeof(*nlmsg)); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_type = typ; hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; memcpy(hdr + 1, data, size); nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); } static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data, int size) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_len = sizeof(*attr) + size; attr->nla_type = typ; if (size > 0) memcpy(attr + 1, data, size); nlmsg->pos += NLMSG_ALIGN(attr->nla_len); } static void netlink_nest(struct nlmsg* nlmsg, int typ) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_type = typ; nlmsg->pos += sizeof(*attr); nlmsg->nested[nlmsg->nesting++] = attr; } static void netlink_done(struct nlmsg* nlmsg) { struct nlattr* attr = nlmsg->nested[--nlmsg->nesting]; attr->nla_len = nlmsg->pos - (char*)attr; } static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type, int* reply_len, bool dofail) { if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting) exit(1); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_len = nlmsg->pos - nlmsg->buf; struct sockaddr_nl addr; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct sockaddr*)&addr, sizeof(addr)); if (n != (ssize_t)hdr->nlmsg_len) { if (dofail) exit(1); return -1; } n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); if (reply_len) *reply_len = 0; if (n < 0) { if (dofail) exit(1); return -1; } if (n < (ssize_t)sizeof(struct nlmsghdr)) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type == NLMSG_DONE) return 0; if (reply_len && hdr->nlmsg_type == reply_type) { *reply_len = n; return 0; } if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type != NLMSG_ERROR) { errno = EINVAL; if (dofail) exit(1); return -1; } errno = -((struct nlmsgerr*)(hdr + 1))->error; return -errno; } static int netlink_send(struct nlmsg* nlmsg, int sock) { return netlink_send_ext(nlmsg, sock, 0, NULL, true); } static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, const char* family_name, bool dofail) { struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = CTRL_CMD_GETFAMILY; netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, strnlen(family_name, GENL_NAMSIZ - 1) + 1); int n = 0; int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail); if (err < 0) { return -1; } uint16_t id = 0; struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr))); for (; (char*)attr < nlmsg->buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == CTRL_ATTR_FAMILY_ID) { id = *(uint16_t*)(attr + 1); break; } } if (!id) { errno = EINVAL; return -1; } recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); return id; } static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset, unsigned int total_len) { struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset); if (offset == total_len || offset + hdr->nlmsg_len > total_len) return -1; return hdr->nlmsg_len; } static unsigned int queue_count = 2; static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type, const char* name, bool up) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr)); if (name) netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name)); netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count)); netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count)); netlink_nest(nlmsg, IFLA_LINKINFO); netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type)); } static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type, const char* name) { netlink_add_device_impl(nlmsg, type, name, false); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name, const char* peer) { netlink_add_device_impl(nlmsg, "veth", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_nest(nlmsg, VETH_INFO_PEER); nlmsg->pos += sizeof(struct ifinfomsg); netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer)); netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count)); netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count)); netlink_done(nlmsg); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_xfrm(struct nlmsg* nlmsg, int sock, const char* name) { netlink_add_device_impl(nlmsg, "xfrm", name, true); netlink_nest(nlmsg, IFLA_INFO_DATA); int if_id = 1; netlink_attr(nlmsg, 2, &if_id, sizeof(if_id)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name, const char* slave1, const char* slave2) { netlink_add_device_impl(nlmsg, "hsr", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); int ifindex1 = if_nametoindex(slave1); netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1)); int ifindex2 = if_nametoindex(slave2); netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_linked(struct nlmsg* nlmsg, int sock, const char* type, const char* name, const char* link) { netlink_add_device_impl(nlmsg, type, name, false); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t id, uint16_t proto) { netlink_add_device_impl(nlmsg, "vlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id)); netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link) { netlink_add_device_impl(nlmsg, "macvlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); uint32_t mode = MACVLAN_MODE_BRIDGE; netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_geneve(struct nlmsg* nlmsg, int sock, const char* name, uint32_t vni, struct in_addr* addr4, struct in6_addr* addr6) { netlink_add_device_impl(nlmsg, "geneve", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_GENEVE_ID, &vni, sizeof(vni)); if (addr4) netlink_attr(nlmsg, IFLA_GENEVE_REMOTE, addr4, sizeof(*addr4)); if (addr6) netlink_attr(nlmsg, IFLA_GENEVE_REMOTE6, addr6, sizeof(*addr6)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } #define IFLA_IPVLAN_FLAGS 2 #define IPVLAN_MODE_L3S 2 #undef IPVLAN_F_VEPA #define IPVLAN_F_VEPA 2 static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t mode, uint16_t flags) { netlink_add_device_impl(nlmsg, "ipvlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode)); netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_device_change(struct nlmsg* nlmsg, int sock, const char* name, bool up, const char* master, const void* mac, int macsize, const char* new_name) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; hdr.ifi_index = if_nametoindex(name); netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr)); if (new_name) netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name)); if (master) { int ifindex = if_nametoindex(master); netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex)); } if (macsize) netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev, const void* addr, int addrsize) { struct ifaddrmsg hdr; memset(&hdr, 0, sizeof(hdr)); hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6; hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120; hdr.ifa_scope = RT_SCOPE_UNIVERSE; hdr.ifa_index = if_nametoindex(dev); netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr)); netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize); netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize); return netlink_send(nlmsg, sock); } static void netlink_add_addr4(struct nlmsg* nlmsg, int sock, const char* dev, const char* addr) { struct in_addr in_addr; inet_pton(AF_INET, addr, &in_addr); int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr)); if (err < 0) { } } static void netlink_add_addr6(struct nlmsg* nlmsg, int sock, const char* dev, const char* addr) { struct in6_addr in6_addr; inet_pton(AF_INET6, addr, &in6_addr); int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr)); if (err < 0) { } } static struct nlmsg nlmsg; #define DEVLINK_FAMILY_NAME "devlink" #define DEVLINK_CMD_PORT_GET 5 #define DEVLINK_ATTR_BUS_NAME 1 #define DEVLINK_ATTR_DEV_NAME 2 #define DEVLINK_ATTR_NETDEV_NAME 7 static struct nlmsg nlmsg2; static void initialize_devlink_ports(const char* bus_name, const char* dev_name, const char* netdev_prefix) { struct genlmsghdr genlhdr; int len, total_len, id, err, offset; uint16_t netdev_index; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock == -1) exit(1); int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (rtsock == -1) exit(1); id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true); if (id == -1) goto error; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = DEVLINK_CMD_PORT_GET; netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1); netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1); err = netlink_send_ext(&nlmsg, sock, id, &total_len, true); if (err < 0) { goto error; } offset = 0; netdev_index = 0; while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) { struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr))); for (; (char*)attr < nlmsg.buf + offset + len; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) { char* port_name; char netdev_name[IFNAMSIZ]; port_name = (char*)(attr + 1); snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix, netdev_index); netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0, netdev_name); break; } } offset += len; netdev_index++; } error: close(rtsock); close(sock); } #define DEV_IPV4 "172.20.20.%d" #define DEV_IPV6 "fe80::%02x" #define DEV_MAC 0x00aaaaaaaaaa static void netdevsim_add(unsigned int addr, unsigned int port_count) { write_file("/sys/bus/netdevsim/del_device", "%u", addr); if (write_file("/sys/bus/netdevsim/new_device", "%u %u", addr, port_count)) { char buf[32]; snprintf(buf, sizeof(buf), "netdevsim%d", addr); initialize_devlink_ports("netdevsim", buf, "netdevsim"); } } #define WG_GENL_NAME "wireguard" enum wg_cmd { WG_CMD_GET_DEVICE, WG_CMD_SET_DEVICE, }; enum wgdevice_attribute { WGDEVICE_A_UNSPEC, WGDEVICE_A_IFINDEX, WGDEVICE_A_IFNAME, WGDEVICE_A_PRIVATE_KEY, WGDEVICE_A_PUBLIC_KEY, WGDEVICE_A_FLAGS, WGDEVICE_A_LISTEN_PORT, WGDEVICE_A_FWMARK, WGDEVICE_A_PEERS, }; enum wgpeer_attribute { WGPEER_A_UNSPEC, WGPEER_A_PUBLIC_KEY, WGPEER_A_PRESHARED_KEY, WGPEER_A_FLAGS, WGPEER_A_ENDPOINT, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, WGPEER_A_LAST_HANDSHAKE_TIME, WGPEER_A_RX_BYTES, WGPEER_A_TX_BYTES, WGPEER_A_ALLOWEDIPS, WGPEER_A_PROTOCOL_VERSION, }; enum wgallowedip_attribute { WGALLOWEDIP_A_UNSPEC, WGALLOWEDIP_A_FAMILY, WGALLOWEDIP_A_IPADDR, WGALLOWEDIP_A_CIDR_MASK, }; static void netlink_wireguard_setup(void) { const char ifname_a[] = "wg0"; const char ifname_b[] = "wg1"; const char ifname_c[] = "wg2"; const char private_a[] = "\xa0\x5c\xa8\x4f\x6c\x9c\x8e\x38\x53\xe2\xfd\x7a\x70\xae\x0f\xb2\x0f\xa1\x52\x60\x0c\xb0\x08\x45\x17\x4f\x08\x07\x6f\x8d\x78\x43"; const char private_b[] = "\xb0\x80\x73\xe8\xd4\x4e\x91\xe3\xda\x92\x2c\x22\x43\x82\x44\xbb\x88\x5c\x69\xe2\x69\xc8\xe9\xd8\x35\xb1\x14\x29\x3a\x4d\xdc\x6e"; const char private_c[] = "\xa0\xcb\x87\x9a\x47\xf5\xbc\x64\x4c\x0e\x69\x3f\xa6\xd0\x31\xc7\x4a\x15\x53\xb6\xe9\x01\xb9\xff\x2f\x51\x8c\x78\x04\x2f\xb5\x42"; const char public_a[] = "\x97\x5c\x9d\x81\xc9\x83\xc8\x20\x9e\xe7\x81\x25\x4b\x89\x9f\x8e\xd9\x25\xae\x9f\x09\x23\xc2\x3c\x62\xf5\x3c\x57\xcd\xbf\x69\x1c"; const char public_b[] = "\xd1\x73\x28\x99\xf6\x11\xcd\x89\x94\x03\x4d\x7f\x41\x3d\xc9\x57\x63\x0e\x54\x93\xc2\x85\xac\xa4\x00\x65\xcb\x63\x11\xbe\x69\x6b"; const char public_c[] = "\xf4\x4d\xa3\x67\xa8\x8e\xe6\x56\x4f\x02\x02\x11\x45\x67\x27\x08\x2f\x5c\xeb\xee\x8b\x1b\xf5\xeb\x73\x37\x34\x1b\x45\x9b\x39\x22"; const uint16_t listen_a = 20001; const uint16_t listen_b = 20002; const uint16_t listen_c = 20003; const uint16_t af_inet = AF_INET; const uint16_t af_inet6 = AF_INET6; const struct sockaddr_in endpoint_b_v4 = { .sin_family = AF_INET, .sin_port = htons(listen_b), .sin_addr = {htonl(INADDR_LOOPBACK)}}; const struct sockaddr_in endpoint_c_v4 = { .sin_family = AF_INET, .sin_port = htons(listen_c), .sin_addr = {htonl(INADDR_LOOPBACK)}}; struct sockaddr_in6 endpoint_a_v6 = { .sin6_family = AF_INET6, .sin6_port = htons(listen_a)}; endpoint_a_v6.sin6_addr = in6addr_loopback; struct sockaddr_in6 endpoint_c_v6 = { .sin6_family = AF_INET6, .sin6_port = htons(listen_c)}; endpoint_c_v6.sin6_addr = in6addr_loopback; const struct in_addr first_half_v4 = {0}; const struct in_addr second_half_v4 = {(uint32_t)htonl(128 << 24)}; const struct in6_addr first_half_v6 = {{{0}}}; const struct in6_addr second_half_v6 = {{{0x80}}}; const uint8_t half_cidr = 1; const uint16_t persistent_keepalives[] = {1, 3, 7, 9, 14, 19}; struct genlmsghdr genlhdr = { .cmd = WG_CMD_SET_DEVICE, .version = 1}; int sock; int id, err; sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock == -1) { return; } id = netlink_query_family_id(&nlmsg, sock, WG_GENL_NAME, true); if (id == -1) goto error; netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_a, strlen(ifname_a) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_a, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_a, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[0], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v6, sizeof(endpoint_c_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[1], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_b, strlen(ifname_b) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_b, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_b, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[2], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v4, sizeof(endpoint_c_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[3], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_c, strlen(ifname_c) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_c, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_c, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[4], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[5], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } error: close(sock); } static void initialize_netdevices(void) { char netdevsim[16]; sprintf(netdevsim, "netdevsim%d", (int)procid); struct { const char* type; const char* dev; } devtypes[] = { {"ip6gretap", "ip6gretap0"}, {"bridge", "bridge0"}, {"vcan", "vcan0"}, {"bond", "bond0"}, {"team", "team0"}, {"dummy", "dummy0"}, {"nlmon", "nlmon0"}, {"caif", "caif0"}, {"batadv", "batadv0"}, {"vxcan", "vxcan1"}, {"veth", 0}, {"wireguard", "wg0"}, {"wireguard", "wg1"}, {"wireguard", "wg2"}, }; const char* devmasters[] = {"bridge", "bond", "team", "batadv"}; struct { const char* name; int macsize; bool noipv6; } devices[] = { {"lo", ETH_ALEN}, {"sit0", 0}, {"bridge0", ETH_ALEN}, {"vcan0", 0, true}, {"tunl0", 0}, {"gre0", 0}, {"gretap0", ETH_ALEN}, {"ip_vti0", 0}, {"ip6_vti0", 0}, {"ip6tnl0", 0}, {"ip6gre0", 0}, {"ip6gretap0", ETH_ALEN}, {"erspan0", ETH_ALEN}, {"bond0", ETH_ALEN}, {"veth0", ETH_ALEN}, {"veth1", ETH_ALEN}, {"team0", ETH_ALEN}, {"veth0_to_bridge", ETH_ALEN}, {"veth1_to_bridge", ETH_ALEN}, {"veth0_to_bond", ETH_ALEN}, {"veth1_to_bond", ETH_ALEN}, {"veth0_to_team", ETH_ALEN}, {"veth1_to_team", ETH_ALEN}, {"veth0_to_hsr", ETH_ALEN}, {"veth1_to_hsr", ETH_ALEN}, {"hsr0", 0}, {"dummy0", ETH_ALEN}, {"nlmon0", 0}, {"vxcan0", 0, true}, {"vxcan1", 0, true}, {"caif0", ETH_ALEN}, {"batadv0", ETH_ALEN}, {netdevsim, ETH_ALEN}, {"xfrm0", ETH_ALEN}, {"veth0_virt_wifi", ETH_ALEN}, {"veth1_virt_wifi", ETH_ALEN}, {"virt_wifi0", ETH_ALEN}, {"veth0_vlan", ETH_ALEN}, {"veth1_vlan", ETH_ALEN}, {"vlan0", ETH_ALEN}, {"vlan1", ETH_ALEN}, {"macvlan0", ETH_ALEN}, {"macvlan1", ETH_ALEN}, {"ipvlan0", ETH_ALEN}, {"ipvlan1", ETH_ALEN}, {"veth0_macvtap", ETH_ALEN}, {"veth1_macvtap", ETH_ALEN}, {"macvtap0", ETH_ALEN}, {"macsec0", ETH_ALEN}, {"veth0_to_batadv", ETH_ALEN}, {"veth1_to_batadv", ETH_ALEN}, {"batadv_slave_0", ETH_ALEN}, {"batadv_slave_1", ETH_ALEN}, {"geneve0", ETH_ALEN}, {"geneve1", ETH_ALEN}, {"wg0", 0}, {"wg1", 0}, {"wg2", 0}, }; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) exit(1); unsigned i; for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) netlink_add_device(&nlmsg, sock, devtypes[i].type, devtypes[i].dev); for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) { char master[32], slave0[32], veth0[32], slave1[32], veth1[32]; sprintf(slave0, "%s_slave_0", devmasters[i]); sprintf(veth0, "veth0_to_%s", devmasters[i]); netlink_add_veth(&nlmsg, sock, slave0, veth0); sprintf(slave1, "%s_slave_1", devmasters[i]); sprintf(veth1, "veth1_to_%s", devmasters[i]); netlink_add_veth(&nlmsg, sock, slave1, veth1); sprintf(master, "%s0", devmasters[i]); netlink_device_change(&nlmsg, sock, slave0, false, master, 0, 0, NULL); netlink_device_change(&nlmsg, sock, slave1, false, master, 0, 0, NULL); } netlink_add_xfrm(&nlmsg, sock, "xfrm0"); netlink_device_change(&nlmsg, sock, "bridge_slave_0", true, 0, 0, 0, NULL); netlink_device_change(&nlmsg, sock, "bridge_slave_1", true, 0, 0, 0, NULL); netlink_add_veth(&nlmsg, sock, "hsr_slave_0", "veth0_to_hsr"); netlink_add_veth(&nlmsg, sock, "hsr_slave_1", "veth1_to_hsr"); netlink_add_hsr(&nlmsg, sock, "hsr0", "hsr_slave_0", "hsr_slave_1"); netlink_device_change(&nlmsg, sock, "hsr_slave_0", true, 0, 0, 0, NULL); netlink_device_change(&nlmsg, sock, "hsr_slave_1", true, 0, 0, 0, NULL); netlink_add_veth(&nlmsg, sock, "veth0_virt_wifi", "veth1_virt_wifi"); netlink_add_linked(&nlmsg, sock, "virt_wifi", "virt_wifi0", "veth1_virt_wifi"); netlink_add_veth(&nlmsg, sock, "veth0_vlan", "veth1_vlan"); netlink_add_vlan(&nlmsg, sock, "vlan0", "veth0_vlan", 0, htons(ETH_P_8021Q)); netlink_add_vlan(&nlmsg, sock, "vlan1", "veth0_vlan", 1, htons(ETH_P_8021AD)); netlink_add_macvlan(&nlmsg, sock, "macvlan0", "veth1_vlan"); netlink_add_macvlan(&nlmsg, sock, "macvlan1", "veth1_vlan"); netlink_add_ipvlan(&nlmsg, sock, "ipvlan0", "veth0_vlan", IPVLAN_MODE_L2, 0); netlink_add_ipvlan(&nlmsg, sock, "ipvlan1", "veth0_vlan", IPVLAN_MODE_L3S, IPVLAN_F_VEPA); netlink_add_veth(&nlmsg, sock, "veth0_macvtap", "veth1_macvtap"); netlink_add_linked(&nlmsg, sock, "macvtap", "macvtap0", "veth0_macvtap"); netlink_add_linked(&nlmsg, sock, "macsec", "macsec0", "veth1_macvtap"); char addr[32]; sprintf(addr, DEV_IPV4, 14 + 10); struct in_addr geneve_addr4; if (inet_pton(AF_INET, addr, &geneve_addr4) <= 0) exit(1); struct in6_addr geneve_addr6; if (inet_pton(AF_INET6, "fc00::01", &geneve_addr6) <= 0) exit(1); netlink_add_geneve(&nlmsg, sock, "geneve0", 0, &geneve_addr4, 0); netlink_add_geneve(&nlmsg, sock, "geneve1", 1, 0, &geneve_addr6); netdevsim_add((int)procid, 4); netlink_wireguard_setup(); for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) { char addr[32]; sprintf(addr, DEV_IPV4, i + 10); netlink_add_addr4(&nlmsg, sock, devices[i].name, addr); if (!devices[i].noipv6) { sprintf(addr, DEV_IPV6, i + 10); netlink_add_addr6(&nlmsg, sock, devices[i].name, addr); } uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40); netlink_device_change(&nlmsg, sock, devices[i].name, true, 0, &macaddr, devices[i].macsize, NULL); } close(sock); } static void initialize_netdevices_init(void) { int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) exit(1); struct { const char* type; int macsize; bool noipv6; bool noup; } devtypes[] = { {"nr", 7, true}, {"rose", 5, true, true}, }; unsigned i; for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) { char dev[32], addr[32]; sprintf(dev, "%s%d", devtypes[i].type, (int)procid); sprintf(addr, "172.30.%d.%d", i, (int)procid + 1); netlink_add_addr4(&nlmsg, sock, dev, addr); if (!devtypes[i].noipv6) { sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1); netlink_add_addr6(&nlmsg, sock, dev, addr); } int macsize = devtypes[i].macsize; uint64_t macaddr = 0xbbbbbb + ((unsigned long long)i << (8 * (macsize - 2))) + (procid << (8 * (macsize - 1))); netlink_device_change(&nlmsg, sock, dev, !devtypes[i].noup, 0, &macaddr, macsize, NULL); } close(sock); } #define MAX_FDS 30 static long syz_genetlink_get_family_id(volatile long name, volatile long sock_arg) { int fd = sock_arg; if (fd < 0) { fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (fd == -1) { return -1; } } struct nlmsg nlmsg_tmp; int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false); if ((int)sock_arg < 0) close(fd); if (ret < 0) { return -1; } return ret; } static void setup_gadgetfs(); static void setup_binderfs(); static void setup_fusectl(); static void sandbox_common_mount_tmpfs(void) { write_file("/proc/sys/fs/mount-max", "100000"); if (mkdir("./syz-tmp", 0777)) exit(1); if (mount("", "./syz-tmp", "tmpfs", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot", 0777)) exit(1); if (mkdir("./syz-tmp/newroot/dev", 0700)) exit(1); unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE; if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/proc", 0700)) exit(1); if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/selinux", 0700)) exit(1); const char* selinux_path = "./syz-tmp/newroot/selinux"; if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) { if (errno != ENOENT) exit(1); if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); } if (mkdir("./syz-tmp/newroot/sys", 0700)) exit(1); if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL)) exit(1); if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/newroot/syz-inputs", 0700)) exit(1); if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, bind_mount_flags | MS_RDONLY, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/pivot", 0777)) exit(1); if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) { if (chdir("./syz-tmp")) exit(1); } else { if (chdir("/")) exit(1); if (umount2("./pivot", MNT_DETACH)) exit(1); } if (chroot("./newroot")) exit(1); if (chdir("/")) exit(1); setup_gadgetfs(); setup_binderfs(); setup_fusectl(); } static void setup_gadgetfs() { if (mkdir("/dev/gadgetfs", 0777)) { } if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) { } } static void setup_fusectl() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void setup_binderfs() { if (mkdir("/dev/binderfs", 0777)) { } if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) { } if (symlink("/dev/binderfs", "./binderfs")) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); if (getppid() == 1) exit(1); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 128 << 20; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); sandbox_common(); drop_caps(); initialize_netdevices_init(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); initialize_netdevices(); sandbox_common_mount_tmpfs(); loop(); exit(1); } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } #define USLEEP_FORKED_CHILD (3 * 50 *1000) static long handle_clone_ret(long ret) { if (ret != 0) { return ret; } usleep(USLEEP_FORKED_CHILD); syscall(__NR_exit, 0); while (1) { } } static long syz_clone(volatile long flags, volatile long stack, volatile long stack_len, volatile long ptid, volatile long ctid, volatile long tls) { long sp = (stack + stack_len) & ~15; long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls); return handle_clone_ret(ret); } struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void execute_one(void) { if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } int i, call, thread; for (call = 0; call < 9; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); event_timedwait(&th->done, 50); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); close_fds(); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[5] = {0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: // socket$nl_generic arguments: [ // domain: const = 0x10 (8 bytes) // type: const = 0x3 (8 bytes) // proto: const = 0x10 (4 bytes) // ] // returns sock_nl_generic res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10); if (res != -1) r[0] = res; break; case 1: // syz_genetlink_get_family_id$devlink arguments: [ // name: ptr[in, buffer] { // buffer: {64 65 76 6c 69 6e 6b 00} (length 0x8) // } // fd: sock_nl_generic (resource) // ] // returns genl_devlink_family_id memcpy((void*)0x200000000080, "devlink\000", 8); res = -1; res = syz_genetlink_get_family_id(/*name=*/0x200000000080, /*fd=*/-1); if (res != -1) r[1] = res; break; case 2: // gettid arguments: [ // ] // returns pid res = syscall(__NR_gettid); if (res != -1) r[2] = res; break; case 3: // sendmsg$DEVLINK_CMD_RELOAD arguments: [ // fd: sock_nl_generic (resource) // msg: ptr[in, msghdr_netlink[netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy]]] { // msghdr_netlink[netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy]] { // addr: nil // addrlen: len = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // vec: ptr[in, iovec[in, netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy]]] { // iovec[in, netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy]] { // addr: ptr[in, netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy]] { // netlink_msg_t[genl_devlink_family_id, genlmsghdr_t[DEVLINK_CMD_RELOAD], devlink_reload_policy] { // len: len = 0x3c (4 bytes) // type: genl_devlink_family_id (resource) // flags: netlink_msg_flags = 0x536ae464467e3e0b (2 bytes) // seq: int32 = 0x0 (4 bytes) // pid: int32 = 0x0 (4 bytes) // payload: genlmsghdr_t[DEVLINK_CMD_RELOAD] { // cmd: const = 0x25 (1 bytes) // version: const = 0x0 (1 bytes) // reserved: const = 0x0 (2 bytes) // } // attrs: array[devlink_reload_policy] { // devlink_reload_policy { // handle: union devlink_handle { // nsim: devlink_nl_policy$nsim { // DEVLINK_ATTR_BUS_NAME: nlattr_t[const[DEVLINK_ATTR_BUS_NAME, int16], string["netdevsim"]] { // nla_len: offsetof = 0xe (2 bytes) // nla_type: const = 0x1 (2 bytes) // payload: buffer: {6e 65 74 64 65 76 73 69 6d 00} (length 0xa) // size: buffer: {} (length 0x0) // pad = 0x0 (2 bytes) // } // DEVLINK_ATTR_DEV_NAME: nlattr_t[const[DEVLINK_ATTR_DEV_NAME, int16], devlink_devname] { // nla_len: offsetof = 0xf (2 bytes) // nla_type: const = 0x2 (2 bytes) // payload: devlink_devname { // prefix: buffer: {6e 65 74 64 65 76 73 69 6d} (length 0x9) // id: proc = 0x0 (1 bytes) // z: const = 0x0 (1 bytes) // } // size: buffer: {} (length 0x0) // pad = 0x0 (1 bytes) // } // } // } // arg: union devlink_nl_policy$reload { // DEVLINK_ATTR_NETNS_PID: nlattr_t[const[DEVLINK_ATTR_NETNS_PID, int16], pid] { // nla_len: offsetof = 0x8 (2 bytes) // nla_type: const = 0x8b (2 bytes) // payload: pid (resource) // size: buffer: {} (length 0x0) // } // } // } // } // } // } // len: len = 0x3c (8 bytes) // } // } // vlen: const = 0x1 (8 bytes) // ctrl: const = 0x0 (8 bytes) // ctrllen: const = 0x0 (8 bytes) // f: send_flags = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // } // } // f: send_flags = 0x0 (8 bytes) // ] *(uint64_t*)0x200000000800 = 0; *(uint32_t*)0x200000000808 = 0; *(uint64_t*)0x200000000810 = 0x200000000380; *(uint64_t*)0x200000000380 = 0x200000000000; *(uint32_t*)0x200000000000 = 0x3c; *(uint16_t*)0x200000000004 = r[1]; *(uint16_t*)0x200000000006 = 0x3e0b; *(uint32_t*)0x200000000008 = 0; *(uint32_t*)0x20000000000c = 0; *(uint8_t*)0x200000000010 = 0x25; *(uint8_t*)0x200000000011 = 0; *(uint16_t*)0x200000000012 = 0; *(uint16_t*)0x200000000014 = 0xe; *(uint16_t*)0x200000000016 = 1; memcpy((void*)0x200000000018, "netdevsim\000", 10); *(uint16_t*)0x200000000024 = 0xf; *(uint16_t*)0x200000000026 = 2; memcpy((void*)0x200000000028, "netdevsim", 9); *(uint8_t*)0x200000000031 = 0x30; *(uint8_t*)0x200000000032 = 0; *(uint16_t*)0x200000000034 = 8; *(uint16_t*)0x200000000036 = 0x8b; *(uint32_t*)0x200000000038 = r[2]; *(uint64_t*)0x200000000388 = 0x3c; *(uint64_t*)0x200000000818 = 1; *(uint64_t*)0x200000000820 = 0; *(uint64_t*)0x200000000828 = 0; *(uint32_t*)0x200000000830 = 0; syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000800ul, /*f=*/0ul); break; case 4: // syz_clone arguments: [ // flags: clone_flags = 0x40b04000 (8 bytes) // stack: nil // stack_len: bytesize = 0x0 (8 bytes) // parentid: nil // childtid: nil // tls: nil // ] // returns pid syz_clone(/*flags=CLONE_NEWNET|CLONE_UNTRACED|CLONE_CHILD_CLEARTID|CLONE_PARENT_SETTID|CLONE_VFORK*/0x40b04000, /*stack=*/0, /*stack_len=*/0, /*parentid=*/0, /*childtid=*/0, /*tls=*/0); break; case 5: // socket$netlink arguments: [ // domain: const = 0x10 (8 bytes) // type: const = 0x3 (8 bytes) // proto: netlink_proto = 0x0 (4 bytes) // ] // returns sock_netlink res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0); if (res != -1) r[3] = res; break; case 6: // sendmsg$nl_route arguments: [ // fd: sock_nl_route (resource) // msg: ptr[in, msghdr_netlink[netlink_msg_route]] { // msghdr_netlink[netlink_msg_route] { // addr: nil // addrlen: len = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // vec: ptr[in, iovec[in, netlink_msg_route]] { // iovec[in, netlink_msg_route] { // addr: ptr[in, netlink_msg_route] { // union netlink_msg_route { // newlink: netlink_msg_t[const[RTM_NEWLINK, int16], ifinfomsg[AF_UNSPEC], ifla_policy] { // len: len = 0x28 (4 bytes) // type: const = 0x10 (2 bytes) // flags: netlink_msg_flags = 0x1 (2 bytes) // seq: int32 = 0x0 (4 bytes) // pid: int32 = 0x0 (4 bytes) // payload: ifinfomsg[AF_UNSPEC] { // ifi_family: const = 0x0 (1 bytes) // __ifi_pad: const = 0x0 (1 bytes) // ifi_type: const = 0x0 (2 bytes) // ifi_index: ifindex (resource) // ifi_flags: net_device_flags = 0xf0ffff (4 bytes) // ifi_change: net_device_flags = 0x0 (4 bytes) // } // attrs: array[ifla_policy] { // union ifla_policy { // IFLA_GROUP: nlattr_t[const[IFLA_GROUP, int16], int32] { // nla_len: offsetof = 0x8 (2 bytes) // nla_type: const = 0x1b (2 bytes) // payload: int32 = 0x0 (4 bytes) // size: buffer: {} (length 0x0) // } // } // } // } // } // } // len: len = 0x28 (8 bytes) // } // } // vlen: const = 0x1 (8 bytes) // ctrl: const = 0x0 (8 bytes) // ctrllen: const = 0x0 (8 bytes) // f: send_flags = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // } // } // f: send_flags = 0x0 (8 bytes) // ] *(uint64_t*)0x2000000000c0 = 0; *(uint32_t*)0x2000000000c8 = 0; *(uint64_t*)0x2000000000d0 = 0x2000000013c0; *(uint64_t*)0x2000000013c0 = 0x200000000040; *(uint32_t*)0x200000000040 = 0x28; *(uint16_t*)0x200000000044 = 0x10; *(uint16_t*)0x200000000046 = 1; *(uint32_t*)0x200000000048 = 0; *(uint32_t*)0x20000000004c = 0; *(uint8_t*)0x200000000050 = 0; *(uint8_t*)0x200000000051 = 0; *(uint16_t*)0x200000000052 = 0; *(uint32_t*)0x200000000054 = 0; *(uint32_t*)0x200000000058 = 0xf0ffff; *(uint32_t*)0x20000000005c = 0; *(uint16_t*)0x200000000060 = 8; *(uint16_t*)0x200000000062 = 0x1b; *(uint32_t*)0x200000000064 = 0; *(uint64_t*)0x2000000013c8 = 0x28; *(uint64_t*)0x2000000000d8 = 1; *(uint64_t*)0x2000000000e0 = 0; *(uint64_t*)0x2000000000e8 = 0; *(uint32_t*)0x2000000000f0 = 0; syscall(__NR_sendmsg, /*fd=*/r[3], /*msg=*/0x2000000000c0ul, /*f=*/0ul); break; case 7: // socket$nl_route arguments: [ // domain: const = 0x10 (8 bytes) // type: const = 0x3 (8 bytes) // proto: const = 0x0 (4 bytes) // ] // returns sock_nl_route res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0); if (res != -1) r[4] = res; break; case 8: // sendmsg$nl_route_sched arguments: [ // fd: sock_nl_route (resource) // msg: ptr[in, msghdr_netlink[netlink_msg_route_sched]] { // msghdr_netlink[netlink_msg_route_sched] { // addr: nil // addrlen: len = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // vec: ptr[in, iovec[in, netlink_msg_route_sched]] { // iovec[in, netlink_msg_route_sched] { // addr: ptr[in, netlink_msg_route_sched] { // union netlink_msg_route_sched { // newqdisc: netlink_msg_t[const[RTM_NEWQDISC, int16], tcmsg[AF_UNSPEC], rtm_tca_policy] { // len: len = 0x54 (4 bytes) // type: const = 0x10 (2 bytes) // flags: netlink_msg_flags = 0x1 (2 bytes) // seq: int32 = 0x0 (4 bytes) // pid: int32 = 0x0 (4 bytes) // payload: tcmsg[AF_UNSPEC] { // family: const = 0x6 (1 bytes) // tcm__pad1: const = 0x0 (1 bytes) // tcm__pad2: const = 0x8100 (2 bytes) // ifindex: ifindex (resource) // tcm_handle: tcm_handle { // minor: tcm_handle_offsets = 0x0 (2 bytes) // major: tcm_handle_offsets = 0x0 (2 bytes) // } // tcm_parent: tcm_handle { // minor: tcm_handle_offsets = 0xfff1 (2 bytes) // major: tcm_handle_offsets = 0x0 (2 bytes) // } // tcm_info: tcm_handle { // minor: tcm_handle_offsets = 0xe (2 bytes) // major: tcm_handle_offsets = 0x10 (2 bytes) // } // } // attrs: array[rtm_tca_policy] { // union rtm_tca_policy { // TCA_EGRESS_BLOCK: nlattr_t[const[TCA_EGRESS_BLOCK, int16], int32] { // nla_len: offsetof = 0x8 (2 bytes) // nla_type: const = 0xe (2 bytes) // payload: int32 = 0x7 (4 bytes) // size: buffer: {} (length 0x0) // } // } // union rtm_tca_policy { // TCA_STAB: nlattr_tt[const[TCA_STAB, int16:14], 0, 1, array[stab_policy]] { // nla_len: offsetof = 0x28 (2 bytes) // nla_type: const = 0x8 (1 bytes) // NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes) // NLA_F_NESTED: const = 0x1 (1 bytes) // payload: array[stab_policy] { // stab_policy { // TCA_STAB_BASE: nlattr_t[const[TCA_STAB_BASE, int16], tc_sizespec] { // nla_len: offsetof = 0x1c (2 bytes) // nla_type: const = 0x11 (2 bytes) // payload: tc_sizespec { // cell_log: int8 = 0x0 (1 bytes) // size_log: int8 = 0x0 (1 bytes) // cell_align: int16 = 0x0 (2 bytes) // overhead: int32 = 0x0 (4 bytes) // linklayer: linklayer = 0x0 (4 bytes) // mpu: int32 = 0x5e06209c (4 bytes) // mtu: int32 = 0x0 (4 bytes) // tsize: len = 0x2 (4 bytes) // } // size: buffer: {} (length 0x0) // } // TCA_STAB_DATA: nlattr_t[const[TCA_STAB_DATA, int16], array[int16]] { // nla_len: offsetof = 0x8 (2 bytes) // nla_type: const = 0x1b (2 bytes) // payload: array[int16] { // int16 = 0x0 (2 bytes) // int16 = 0x0 (2 bytes) // } // size: buffer: {} (length 0x0) // } // } // } // size: buffer: {} (length 0x0) // } // } // } // } // } // } // len: len = 0x54 (8 bytes) // } // } // vlen: const = 0x1 (8 bytes) // ctrl: const = 0x0 (8 bytes) // ctrllen: const = 0x0 (8 bytes) // f: send_flags = 0x0 (4 bytes) // pad = 0x0 (4 bytes) // } // } // f: send_flags = 0x0 (8 bytes) // ] *(uint64_t*)0x200000000180 = 0; *(uint32_t*)0x200000000188 = 0; *(uint64_t*)0x200000000190 = 0x200000000280; *(uint64_t*)0x200000000280 = 0x2000000001c0; *(uint32_t*)0x2000000001c0 = 0x54; *(uint16_t*)0x2000000001c4 = 0x10; *(uint16_t*)0x2000000001c6 = 1; *(uint32_t*)0x2000000001c8 = 0; *(uint32_t*)0x2000000001cc = 0; *(uint8_t*)0x2000000001d0 = 6; *(uint8_t*)0x2000000001d1 = 0; *(uint16_t*)0x2000000001d2 = 0x8100; *(uint32_t*)0x2000000001d4 = 0; *(uint16_t*)0x2000000001d8 = 0; *(uint16_t*)0x2000000001da = 0; *(uint16_t*)0x2000000001dc = 0xfff1; *(uint16_t*)0x2000000001de = 0; *(uint16_t*)0x2000000001e0 = 0xe; *(uint16_t*)0x2000000001e2 = 0x10; *(uint16_t*)0x2000000001e4 = 8; *(uint16_t*)0x2000000001e6 = 0xe; *(uint32_t*)0x2000000001e8 = 7; *(uint16_t*)0x2000000001ec = 0x28; STORE_BY_BITMASK(uint16_t, , 0x2000000001ee, 8, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x2000000001ef, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x2000000001ef, 1, 7, 1); *(uint16_t*)0x2000000001f0 = 0x1c; *(uint16_t*)0x2000000001f2 = 0x11; *(uint8_t*)0x2000000001f4 = 0; *(uint8_t*)0x2000000001f5 = 0; *(uint16_t*)0x2000000001f6 = 0; *(uint32_t*)0x2000000001f8 = 0; *(uint32_t*)0x2000000001fc = 0; *(uint32_t*)0x200000000200 = 0x5e06209c; *(uint32_t*)0x200000000204 = 0; *(uint32_t*)0x200000000208 = 2; *(uint16_t*)0x20000000020c = 8; *(uint16_t*)0x20000000020e = 0x1b; *(uint16_t*)0x200000000210 = 0; *(uint16_t*)0x200000000212 = 0; *(uint64_t*)0x200000000288 = 0x54; *(uint64_t*)0x200000000198 = 1; *(uint64_t*)0x2000000001a0 = 0; *(uint64_t*)0x2000000001a8 = 0; *(uint32_t*)0x2000000001b0 = 0; syscall(__NR_sendmsg, /*fd=*/r[4], /*msg=*/0x200000000180ul, /*f=*/0ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; do_sandbox_none(); return 0; }