// https://syzkaller.appspot.com/bug?id=7c7bd742d3b6b7473427759ad255c581dbd94412 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include const int kFailStatus = 67; const int kRetryStatus = 69; static void fail(const char* msg, ...) { int e = errno; va_list args; va_start(args, msg); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, " (errno %d)\n", e); doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); } static uint64_t current_time_ms() { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) fail("clock_gettime failed"); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } struct ipt_getinfo { char name[32]; unsigned int valid_hooks; unsigned int hook_entry[5]; unsigned int underflow[5]; unsigned int num_entries; unsigned int size; }; struct ipt_get_entries { char name[32]; unsigned int size; void* entrytable[1024 / sizeof(void*)]; }; struct xt_counters { uint64_t pcnt, bcnt; }; struct ipt_replace { char name[32]; unsigned int valid_hooks; unsigned int num_entries; unsigned int size; unsigned int hook_entry[5]; unsigned int underflow[5]; unsigned int num_counters; struct xt_counters* counters; char entrytable[1024]; }; struct ipt_table_desc { const char* name; struct ipt_getinfo info; struct ipt_get_entries entries; struct ipt_replace replace; struct xt_counters counters[10]; }; static struct ipt_table_desc ipv4_tables[] = { {.name = "filter"}, {.name = "nat"}, {.name = "mangle"}, {.name = "raw"}, {.name = "security"}, }; #define IPT_BASE_CTL 64 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL) #define IPT_SO_GET_INFO (IPT_BASE_CTL) #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1) static void checkpoint_net_namespace(void) { socklen_t optlen; unsigned i; int fd; fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (fd == -1) fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) { struct ipt_table_desc* table = &ipv4_tables[i]; strcpy(table->info.name, table->name); strcpy(table->entries.name, table->name); strcpy(table->replace.name, table->name); optlen = sizeof(table->info); if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &table->info, &optlen)) { switch (errno) { case EPERM: case ENOENT: case ENOPROTOOPT: continue; } fail("getsockopt(IPT_SO_GET_INFO)"); } if (table->info.size > sizeof(table->entries.entrytable)) fail("table size is too large: %u", table->info.size); if (table->info.num_entries > sizeof(table->counters) / sizeof(table->counters[0])) fail("too many counters: %u", table->info.num_entries); table->entries.size = table->info.size; optlen = sizeof(table->entries) - sizeof(table->entries.entrytable) + table->info.size; if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &table->entries, &optlen)) fail("getsockopt(IPT_SO_GET_ENTRIES)"); table->replace.valid_hooks = table->info.valid_hooks; table->replace.num_entries = table->info.num_entries; table->replace.counters = table->counters; table->replace.size = table->info.size; memcpy(table->replace.hook_entry, table->info.hook_entry, sizeof(table->replace.hook_entry)); memcpy(table->replace.underflow, table->info.underflow, sizeof(table->replace.underflow)); memcpy(table->replace.entrytable, table->entries.entrytable, table->info.size); } close(fd); } static void reset_net_namespace(void) { struct ipt_get_entries entries; struct ipt_getinfo info; socklen_t optlen; unsigned i; int fd; memset(&info, 0, sizeof(info)); memset(&entries, 0, sizeof(entries)); fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (fd == -1) fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) { struct ipt_table_desc* table = &ipv4_tables[i]; if (table->info.valid_hooks == 0) continue; strcpy(info.name, table->name); optlen = sizeof(info); if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &info, &optlen)) fail("getsockopt(IPT_SO_GET_INFO)"); if (memcmp(&table->info, &info, sizeof(table->info)) == 0) { strcpy(entries.name, table->name); entries.size = table->info.size; optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size; if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &entries, &optlen)) fail("getsockopt(IPT_SO_GET_ENTRIES)"); if (memcmp(&table->entries, &entries, optlen) == 0) continue; } table->replace.num_counters = info.num_entries; optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) + table->replace.size; if (setsockopt(fd, SOL_IP, IPT_SO_SET_REPLACE, &table->replace, optlen)) fail("setsockopt(IPT_SO_SET_REPLACE)"); } close(fd); } static void test(); void loop() { int iter; checkpoint_net_namespace(); for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) fail("loop fork failed"); if (pid == 0) { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); test(); doexit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { int res = waitpid(-1, &status, __WALL | WNOHANG); if (res == pid) break; usleep(1000); if (current_time_ms() - start > 5 * 1000) { kill(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, __WALL) != pid) { } break; } } reset_net_namespace(); } } struct thread_t { int created, running, call; pthread_t th; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static int collide; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); if (collide && call % 2) break; struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } #ifndef __NR_dup #define __NR_dup 41 #endif #ifndef __NR_sendto #define __NR_sendto 369 #endif #ifndef __NR_sendmsg #define __NR_sendmsg 370 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_socket #define __NR_socket 359 #endif #ifndef __NR_setsockopt #define __NR_setsockopt 366 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[2]; uint64_t procid; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0); break; case 1: r[0] = syscall(__NR_socket, 2, 1, 0); break; case 2: *(uint32_t*)0x2039c000 = 1; syscall(__NR_setsockopt, r[0], 6, 0x13, 0x2039c000, 4); break; case 3: *(uint32_t*)0x20383000 = 1; syscall(__NR_setsockopt, r[0], 6, 0x14, 0x20383000, 4); break; case 4: r[1] = syscall(__NR_dup, r[0]); break; case 5: *(uint16_t*)0x20e45ff0 = 2; *(uint16_t*)0x20e45ff2 = 0; *(uint32_t*)0x20e45ff4 = htobe32(0x7f000001); *(uint8_t*)0x20e45ff8 = 0; *(uint8_t*)0x20e45ff9 = 0; *(uint8_t*)0x20e45ffa = 0; *(uint8_t*)0x20e45ffb = 0; *(uint8_t*)0x20e45ffc = 0; *(uint8_t*)0x20e45ffd = 0; *(uint8_t*)0x20e45ffe = 0; *(uint8_t*)0x20e45fff = 0; syscall(__NR_sendto, r[0], 0x20482000, 0xffffff56, 0x20000401, 0x20e45ff0, 0x10); break; case 6: *(uint32_t*)0x20789fc8 = 0x20ca4ff4; *(uint32_t*)0x20789fcc = 0xc; *(uint32_t*)0x20789fd0 = 0x20126000; *(uint32_t*)0x20789fd4 = 1; *(uint32_t*)0x20789fd8 = 0; *(uint32_t*)0x20789fdc = 0; *(uint32_t*)0x20789fe0 = 0; *(uint16_t*)0x20ca4ff4 = 0x10; *(uint16_t*)0x20ca4ff6 = 0; *(uint32_t*)0x20ca4ff8 = 0; *(uint32_t*)0x20ca4ffc = 0; *(uint32_t*)0x20126000 = 0x209ebfa0; *(uint32_t*)0x20126004 = 0x4c; *(uint32_t*)0x209ebfa0 = 0x4c; *(uint16_t*)0x209ebfa4 = 0x20; *(uint16_t*)0x209ebfa6 = 0; *(uint32_t*)0x209ebfa8 = 0; *(uint32_t*)0x209ebfac = 0; *(uint8_t*)0x209ebfb0 = 0; *(uint32_t*)0x209ebfb4 = htobe32(-1); *(uint8_t*)0x209ebfc4 = 0xfe; *(uint8_t*)0x209ebfc5 = 0x80; *(uint8_t*)0x209ebfc6 = 0; *(uint8_t*)0x209ebfc7 = 0; *(uint8_t*)0x209ebfc8 = 0; *(uint8_t*)0x209ebfc9 = 0; *(uint8_t*)0x209ebfca = 0; *(uint8_t*)0x209ebfcb = 0; *(uint8_t*)0x209ebfcc = 0; *(uint8_t*)0x209ebfcd = 0; *(uint8_t*)0x209ebfce = 0; *(uint8_t*)0x209ebfcf = 0; *(uint8_t*)0x209ebfd0 = 0; *(uint8_t*)0x209ebfd1 = 0; *(uint8_t*)0x209ebfd2 = 0; *(uint8_t*)0x209ebfd3 = 0xbb; *(uint16_t*)0x209ebfd4 = 0; *(uint16_t*)0x209ebfd6 = htobe16(0); *(uint16_t*)0x209ebfd8 = 0; *(uint16_t*)0x209ebfda = htobe16(0); *(uint16_t*)0x209ebfdc = 0; *(uint8_t*)0x209ebfde = 0; *(uint8_t*)0x209ebfdf = 0; *(uint8_t*)0x209ebfe0 = 0; *(uint32_t*)0x209ebfe4 = 0; *(uint32_t*)0x209ebfe8 = 0; syscall(__NR_sendmsg, r[1], 0x20789fc8, 0); break; case 7: *(uint8_t*)0x208f5fee = -1; *(uint8_t*)0x208f5fef = -1; *(uint8_t*)0x208f5ff0 = -1; *(uint8_t*)0x208f5ff1 = -1; *(uint8_t*)0x208f5ff2 = -1; *(uint8_t*)0x208f5ff3 = -1; *(uint8_t*)0x208f5ff4 = -1; *(uint8_t*)0x208f5ff5 = -1; *(uint8_t*)0x208f5ff6 = -1; *(uint8_t*)0x208f5ff7 = -1; *(uint8_t*)0x208f5ff8 = -1; *(uint8_t*)0x208f5ff9 = -1; *(uint16_t*)0x208f5ffa = htobe16(0x8906); break; } } void test() { memset(r, -1, sizeof(r)); execute(8); collide = 1; execute(8); } int main() { for (procid = 0; procid < 8; procid++) { if (fork() == 0) { for (;;) { loop(); } } } sleep(1000000); return 0; }