// https://syzkaller.appspot.com/bug?id=f6f391dfa278da75ef96a4b47ba6cbd72d1b17d4 // 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); } 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 < 15; 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[8] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; 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: syscall(__NR_socket, 0x10ul, 3ul, 0); break; case 2: syscall(__NR_socket, 0xaul, 2ul, 0); break; case 3: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[1] = res; break; case 4: res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[2] = res; break; case 5: *(uint64_t*)0x20000280 = 0; *(uint32_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 0x200001c0; *(uint64_t*)0x200001c0 = 0; *(uint64_t*)0x200001c8 = 0x18; *(uint64_t*)0x20000298 = 1; *(uint64_t*)0x200002a0 = 0; *(uint64_t*)0x200002a8 = 0; *(uint32_t*)0x200002b0 = 0; syscall(__NR_sendmsg, r[2], 0x20000280ul, 0ul); break; case 6: *(uint32_t*)0x20000300 = 0x14; res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x20000300ul); if (res != -1) r[3] = *(uint32_t*)0x20000104; break; case 7: *(uint64_t*)0x20000040 = 0; *(uint32_t*)0x20000048 = 0; *(uint64_t*)0x20000050 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000080; memcpy((void*)0x20000080, "\x48\x00\x00\x00\x10\x00\x05\x07\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00", 20); *(uint32_t*)0x20000094 = r[3]; memcpy((void*)0x20000098, "\x00\x00\x00\x00\x00\x00\x00\x00\x28\x00\x12\x00\x0b\x00\x01\x00" "\x76\x65\x74\x68", 20); *(uint64_t*)0x20000008 = 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 8: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[4] = res; break; case 9: res = syscall(__NR_socket, 1ul, 0x803ul, 0); if (res != -1) r[5] = res; break; case 10: syscall(__NR_socketpair, 1ul, 1ul, 0, 0ul); break; case 11: *(uint32_t*)0x200002c0 = 0x14; res = syscall(__NR_getsockname, r[5], 0x20000100ul, 0x200002c0ul); if (res != -1) r[6] = *(uint32_t*)0x20000104; break; case 12: res = syscall(__NR_socket, 0xaul, 1ul, 0); if (res != -1) r[7] = res; break; case 13: *(uint64_t*)0x20000340 = 0; *(uint32_t*)0x20000348 = 0; *(uint64_t*)0x20000350 = 0x20000140; *(uint64_t*)0x20000140 = 0x20004040; memcpy((void*)0x20004040, "\x44\x00\x00\x00\x10\x00\x01\x04\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00", 20); *(uint32_t*)0x20004054 = 0; memcpy((void*)0x20004058, "\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x12\x80\x0c\x00\x01\x00" "\x6d\x61\x63\x76\x6c\x61\x6e\x00\x04\x00\x02\x80\x08\x00\x05\x00", 32); *(uint32_t*)0x20004078 = r[6]; memcpy((void*)0x2000407c, "\b\000\n\000", 4); *(uint32_t*)0x20004080 = r[7]; *(uint64_t*)0x20000148 = 0x44; *(uint64_t*)0x20000358 = 1; *(uint64_t*)0x20000360 = 0; *(uint64_t*)0x20000368 = 0; *(uint32_t*)0x20000370 = 0; syscall(__NR_sendmsg, r[4], 0x20000340ul, 0ul); break; case 14: *(uint64_t*)0x20000200 = 0; *(uint32_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0x20000240; *(uint64_t*)0x20000240 = 0x20000380; *(uint32_t*)0x20000380 = 0x24; *(uint16_t*)0x20000384 = 0x11; *(uint16_t*)0x20000386 = 0xd27; *(uint32_t*)0x20000388 = 0x7a; *(uint32_t*)0x2000038c = 0; *(uint8_t*)0x20000390 = 0; *(uint8_t*)0x20000391 = 0; *(uint16_t*)0x20000392 = 0; *(uint32_t*)0x20000394 = r[3]; *(uint16_t*)0x20000398 = 0; *(uint16_t*)0x2000039a = 0; *(uint16_t*)0x2000039c = 0; *(uint16_t*)0x2000039e = 0; *(uint16_t*)0x200003a0 = 0; *(uint16_t*)0x200003a2 = 0; *(uint64_t*)0x20000248 = 0x24; *(uint64_t*)0x20000218 = 1; *(uint64_t*)0x20000220 = 0xf0ffffffffffff; *(uint64_t*)0x20000228 = 0; *(uint32_t*)0x20000230 = 0; syscall(__NR_sendmsg, r[0], 0x20000200ul, 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; }