// https://syzkaller.appspot.com/bug?id=2df1937e0b982de5a99f283487961ef3a9965af0 // 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 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; } 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"); } 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) { int i, call, thread; for (call = 0; call < 11; 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); } 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 (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[0] = res; break; case 1: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[1] = res; break; case 2: res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[2] = res; break; case 3: *(uint64_t*)0x200006c0 = 0; *(uint32_t*)0x200006c8 = 0; *(uint64_t*)0x200006d0 = 0x20000680; *(uint64_t*)0x20000680 = 0; *(uint64_t*)0x20000688 = 0x18; *(uint64_t*)0x200006d8 = 1; *(uint64_t*)0x200006e0 = 0; *(uint64_t*)0x200006e8 = 0; *(uint32_t*)0x200006f0 = 0; syscall(__NR_sendmsg, r[2], 0x200006c0ul, 0ul); break; case 4: *(uint32_t*)0x20000200 = 0x14; res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x20000200ul); if (res != -1) r[3] = *(uint32_t*)0x20000104; break; case 5: *(uint64_t*)0x20000040 = 0; *(uint32_t*)0x20000048 = 0; *(uint64_t*)0x20000050 = 0x20000240; *(uint64_t*)0x20000240 = 0x20000540; memcpy((void*)0x20000540, "\x48\x00\x00\x00\x10\x00\x05\x07\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x04\x00", 20); *(uint32_t*)0x20000554 = r[3]; memcpy((void*)0x20000558, "\x00\x00\x00\x00\x00\x00\x00\x00\x28\x00\x12\x00\x0c\x00\x01\x00" "\x76\x65\x74\x68", 20); *(uint64_t*)0x20000248 = 0x48; *(uint64_t*)0x20000058 = 1; *(uint64_t*)0x20000060 = 0; *(uint64_t*)0x20000068 = 0; *(uint32_t*)0x20000070 = 0; syscall(__NR_sendmsg, r[1], 0x20000040ul, 0ul); break; case 6: *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint64_t*)0x20000150 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000080; *(uint32_t*)0x20000080 = 0x4c; *(uint16_t*)0x20000084 = 0x10; *(uint16_t*)0x20000086 = 0x581; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint8_t*)0x20000090 = 0; *(uint8_t*)0x20000091 = 0; *(uint16_t*)0x20000092 = 0; *(uint32_t*)0x20000094 = 0; *(uint32_t*)0x20000098 = 1; *(uint32_t*)0x2000009c = 0; *(uint16_t*)0x200000a0 = 0x24; STORE_BY_BITMASK(uint16_t, , 0x200000a2, 0x12, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200000a3, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200000a3, 1, 7, 1); *(uint16_t*)0x200000a4 = 9; *(uint16_t*)0x200000a6 = 1; memcpy((void*)0x200000a8, "vlan\000", 5); *(uint16_t*)0x200000b0 = 0x14; STORE_BY_BITMASK(uint16_t, , 0x200000b2, 2, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200000b3, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200000b3, 1, 7, 1); *(uint16_t*)0x200000b4 = 6; *(uint16_t*)0x200000b6 = 1; *(uint16_t*)0x200000b8 = 3; *(uint16_t*)0x200000bc = 6; *(uint16_t*)0x200000be = 1; *(uint16_t*)0x200000c0 = 4; *(uint16_t*)0x200000c4 = 8; *(uint16_t*)0x200000c6 = 5; *(uint32_t*)0x200000c8 = r[3]; *(uint64_t*)0x20000008 = 0x4c; *(uint64_t*)0x20000158 = 1; *(uint64_t*)0x20000160 = 0; *(uint64_t*)0x20000168 = 0; *(uint32_t*)0x20000170 = 0x800; syscall(__NR_sendmsg, r[0], 0x20000140ul, 4ul); break; case 7: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[4] = res; break; case 8: res = syscall(__NR_socket, 0x11ul, 3ul, 0x300); if (res != -1) r[5] = res; break; case 9: *(uint32_t*)0x20000200 = 0; res = syscall(__NR_getsockname, r[5], 0x20000100ul, 0x20000200ul); if (res != -1) r[6] = *(uint32_t*)0x20000104; break; case 10: *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint64_t*)0x20000150 = 0x20000280; *(uint64_t*)0x20000280 = 0x20000740; *(uint32_t*)0x20000740 = 0x20; *(uint16_t*)0x20000744 = 0x11; *(uint16_t*)0x20000746 = 0x40d; *(uint32_t*)0x20000748 = 0; *(uint32_t*)0x2000074c = 0; *(uint8_t*)0x20000750 = 0; *(uint8_t*)0x20000751 = 0; *(uint16_t*)0x20000752 = 0; *(uint32_t*)0x20000754 = r[6]; *(uint32_t*)0x20000758 = 0; *(uint32_t*)0x2000075c = 0; *(uint64_t*)0x20000288 = 0x20; *(uint64_t*)0x20000158 = 1; *(uint64_t*)0x20000160 = 0; *(uint64_t*)0x20000168 = 0; *(uint32_t*)0x20000170 = 0; syscall(__NR_sendmsg, r[4], 0x20000140ul, 0ul); break; } } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }