// https://syzkaller.appspot.com/bug?id=f35281f65a6c33ca898b72786b2d5f722037a506 // 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 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 < 8; 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); if (call == 5 || call == 7) break; 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[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = syscall(__NR_socket, 0xaul, 6ul, 0); if (res != -1) r[0] = res; break; case 1: *(uint16_t*)0x20000040 = 0xa; *(uint16_t*)0x20000042 = htobe16(0x4e20); *(uint32_t*)0x20000044 = htobe32(0); memset((void*)0x20000048, 0, 16); *(uint32_t*)0x20000058 = 0; syscall(__NR_bind, r[0], 0x20000040ul, 0x1cul); break; case 2: res = syscall(__NR_socket, 2ul, 6ul, 0); if (res != -1) r[1] = res; break; case 3: syscall(__NR_listen, r[0], 6); break; case 4: memset((void*)0x201c9fff, 3, 1); syscall(__NR_setsockopt, r[1], 0x10d, 0xd, 0x201c9ffful, 1ul); break; case 5: *(uint64_t*)0x20006440 = 0; *(uint32_t*)0x20006448 = 0; *(uint64_t*)0x20006450 = 0x200000c0; *(uint64_t*)0x200000c0 = 0x20000400; memcpy( (void*)0x20000400, "\xe1\xaf\x1f\x36\x99\xc7\x8e\x61\xd5\x3b\x80\x7c\xb2\xe2\xd7\x59\xfd" "\xc3\xe0\x44\x2e\x0c\x25\x6d\x07\xb4\xd5\xd8\x98\x25\x78\x87\xaf\xcf" "\xb8\xc2\xc7\x03\xd8\xf9\x55\x0b\x6a\x52\x1c\x97\x3b\xac\x4e\x57\xb7" "\xf0\xee\x57\x6d\x8c\xd1\xe0\xb1\xbf\x53\xc6\x20\xc0\xa2\x81\xde\x57" "\xba\xe0\x83\xd0\xdd\xec\x53\xae\xc2\xc0\xf1\xe5\xaa\x00\x28\x79\xfc" "\x60\x62\x20\x8a\xb4\xb8\xe2\x4b\x00\x2c\xf1\xc6\x7e\x06\x55\x33\x3e" "\x90\x6b\x39\x15\x9b\x29\x0e\x59\x4c\xdf\x8d\x05\x9c\x23\xda\xec\xbf" "\x4d\xc7\x1a\x7e\x5d\xeb\x88\x9d\xd7\xad\x50\xa0\x92\xe3\xad\x6a\x72" "\x3e\xb3\x95\x87\x78\xb8\x54\xaa\x5d\x6d\xff\xfd\x9f\x78\xac\xf6\x1f" "\xc6\x16\x3f\x29\xe9\xab\x2d\xa4\x1a\x53\xf3\xc5\xf9\xdc\xad\xbc\x6a" "\x01\xe1\x66\x84\xd1\x63\x86\xe9\x94\x7a\x1a\xd6\xee\x5c\x3b\x43\x87" "\x14\x71\x93\x0b\x31\x90", 193); *(uint64_t*)0x200000c8 = 0xc1; *(uint64_t*)0x200000d0 = 0; *(uint64_t*)0x200000d8 = 0; *(uint64_t*)0x200000e0 = 0; *(uint64_t*)0x200000e8 = 0; *(uint64_t*)0x200000f0 = 0; *(uint64_t*)0x200000f8 = 0; *(uint64_t*)0x20006458 = 4; *(uint64_t*)0x20006460 = 0; *(uint64_t*)0x20006468 = 0; *(uint32_t*)0x20006470 = 0; *(uint32_t*)0x20006478 = 0; *(uint64_t*)0x20006480 = 0; *(uint32_t*)0x20006488 = 0; *(uint64_t*)0x20006490 = 0; *(uint64_t*)0x20006498 = 0; *(uint64_t*)0x200064a0 = 0x20000b00; *(uint64_t*)0x20000b00 = 0x10; *(uint32_t*)0x20000b08 = 0x105; *(uint32_t*)0x20000b0c = 0xd0; *(uint64_t*)0x20000b10 = 0x10; *(uint32_t*)0x20000b18 = 0x116; *(uint32_t*)0x20000b1c = 0xf5; *(uint64_t*)0x20000b20 = 0x10; *(uint32_t*)0x20000b28 = 0x3a; *(uint32_t*)0x20000b2c = 0x7ff; *(uint64_t*)0x20000b30 = 0x10; *(uint32_t*)0x20000b38 = 0x104; *(uint32_t*)0x20000b3c = 3; *(uint64_t*)0x20000b40 = 0x10; *(uint32_t*)0x20000b48 = 0x11d; *(uint32_t*)0x20000b4c = 0x1ff; *(uint64_t*)0x20000b50 = 0x10; *(uint32_t*)0x20000b58 = 0x29; *(uint32_t*)0x20000b5c = 0; *(uint64_t*)0x20000b60 = 0x10; *(uint32_t*)0x20000b68 = 0x119; *(uint32_t*)0x20000b6c = 8; *(uint64_t*)0x20000b70 = 0x10; *(uint32_t*)0x20000b78 = 0x10b; *(uint32_t*)0x20000b7c = 5; *(uint64_t*)0x200064a8 = 0x80; *(uint32_t*)0x200064b0 = 0; *(uint32_t*)0x200064b8 = 0; *(uint64_t*)0x200064c0 = 0; *(uint32_t*)0x200064c8 = 0; *(uint64_t*)0x200064d0 = 0; *(uint64_t*)0x200064d8 = 0; *(uint64_t*)0x200064e0 = 0; *(uint64_t*)0x200064e8 = 0; *(uint32_t*)0x200064f0 = 0; *(uint32_t*)0x200064f8 = 0; *(uint64_t*)0x20006500 = 0; *(uint32_t*)0x20006508 = 0; *(uint64_t*)0x20006510 = 0; *(uint64_t*)0x20006518 = 0; *(uint64_t*)0x20006520 = 0; *(uint64_t*)0x20006528 = 0; *(uint32_t*)0x20006530 = 0; *(uint32_t*)0x20006538 = 0; *(uint64_t*)0x20006540 = 0; *(uint32_t*)0x20006548 = 0; *(uint64_t*)0x20006550 = 0; *(uint64_t*)0x20006558 = 0; *(uint64_t*)0x20006560 = 0; *(uint64_t*)0x20006568 = 0; *(uint32_t*)0x20006570 = 0; *(uint32_t*)0x20006578 = 0; *(uint64_t*)0x20006580 = 0; *(uint32_t*)0x20006588 = 0; *(uint64_t*)0x20006590 = 0; *(uint64_t*)0x20006598 = 0; *(uint64_t*)0x200065a0 = 0; *(uint64_t*)0x200065a8 = 0; *(uint32_t*)0x200065b0 = 0; *(uint32_t*)0x200065b8 = 0; *(uint64_t*)0x200065c0 = 0; *(uint32_t*)0x200065c8 = 0; *(uint64_t*)0x200065d0 = 0; *(uint64_t*)0x200065d8 = 0; *(uint64_t*)0x200065e0 = 0; *(uint64_t*)0x200065e8 = 0; *(uint32_t*)0x200065f0 = 0; *(uint32_t*)0x200065f8 = 0; syscall(__NR_sendmmsg, r[1], 0x20006440ul, 7ul, 0x20000891ul); { int i; for (i = 0; i < 64; i++) { syscall(__NR_sendmmsg, r[1], 0x20006440ul, 7ul, 0x20000891ul); } } break; case 6: *(uint16_t*)0x20e5c000 = 2; *(uint16_t*)0x20e5c002 = htobe16(0x4e20); *(uint32_t*)0x20e5c004 = htobe32(0); syscall(__NR_connect, r[1], 0x20e5c000ul, 0x10ul); { int i; for (i = 0; i < 64; i++) { syscall(__NR_connect, r[1], 0x20e5c000ul, 0x10ul); } } break; case 7: *(uint64_t*)0x20000ac0 = 0; *(uint32_t*)0x20000ac8 = 0x5d; *(uint64_t*)0x20000ad0 = 0x20000180; *(uint64_t*)0x20000180 = 0x20000880; memset((void*)0x20000880, 84, 1); *(uint64_t*)0x20000188 = 1; *(uint64_t*)0x20000ad8 = 5; *(uint64_t*)0x20000ae0 = 0; *(uint64_t*)0x20000ae8 = 0; *(uint32_t*)0x20000af0 = 0; *(uint32_t*)0x20000af8 = 0; syscall(__NR_sendmmsg, r[1], 0x20000ac0ul, 0x503ul, 0ul); { int i; for (i = 0; i < 64; i++) { syscall(__NR_sendmmsg, r[1], 0x20000ac0ul, 0x503ul, 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); loop(); return 0; }