// https://syzkaller.appspot.com/bug?id=2d36e7f205f5655cb59ce49754c466cd6c0a2b22 // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif 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 < 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); } 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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: *(uint32_t*)0x20000100 = 1; 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"\xd8\xab\x00\x13\x39\xe4\x64\xc8\xeb\x5f\x0c\x63\x89\x90\x10\x75\x7c" "\x9a\x3b\x69\xf4\x92\x05\x31\xb8\x3f\x71\xd5\xa3\x4e\xf9\x40\x58\x19" "\x2f\xee\x15\xb7\x7c\x01\x5e\xa7\x55\xc9\x51\x27\xff\x22\x74\xbb\x9a" "\x84\x63\xce\x4b\x8c\x08\xad\x70\x59\x6a\xd2\xb2\xb0\x44\xe6\x60\xed" "\x14\x4b\x9d\xce\x37\x24\x50\xea\x69\xd2\x5d\xa2\xb6\xde\xed\x67\xfa" "\xc2\x6e\x76\x5a\x5d\xb5\xfd\x98\x47\xe9\x60\x51\x46\x4b\x97\x6c\xa7" "\xd5\x53\x2b\xa1\x04\x4f\x62\xdb\x04\x94\x86\xac\xde\x22\x94\x12\x7c" "\xb7\x67\xc2\x3d\xa7\xd8\xf9\x84\x4d\x3b\xe5\xb5\xaa\x83\xee\x4c\xe1" "\x87\x6a\xf5\x13\x0e\xfe\x1b\x64\xcc\xb6\xbb\xd3\x49\xbc\xc0\xe8\xde" "\xec\x8a\xb3\xbd\x1b\x35\xbb\xc8\xab\x8a\x15\x27\x71\x74\x4b\xaa\x57" "\x6b\x92\x23\xd2\x6b\x56\x03\xa7\xf0\x91\xbe\x12\x64\xca\xba\xf6\x61" "\xfe\x2d\xbe\x79\x90\xa6\x1f\x71\x0f\x92\x3f\x23\x37\x81\x8a\x39\x83" "\xd0\x6c\x11\xa6\xbe\xe7\xfc\xcb\x78\xa5\x3c\x56\xdb\x5c\x18\xf9\x20" "\xd2\x19\x43\x74\xdb\x66\x5d\xca\xdf\x51\xb8\xd0\x01\x4e\x68\x2e\xc7" "\x21\xd6\x7a\x7a\xb6\xc8\x17\xfe\x53\xc8\x6f\x89\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x60\xb7\xb8\x27\xc5\x6e\x97" "\x3a\x2a\xb5\xbc\x5c\x55\x8a\xda\x68\xc4\xec\x37\x62\xf5\x95\x7b\x20" "\xb9\x19\xaf\x5d\x53\xc8\x7d\xe0\x56\xa3\x97\xbd\xcb\x61\x4c\x34\x76" "\x1e\x2c\x81\x56\x98\xe1\xf9\xf5\x52\x1a\x38\x5c\x29\x10\x85\x09\x29" "\x04\x0a\x4e\xba\x57\x3e\x91\xca\x21\xfc\x85\x53\x58\x12\x0e\xcd\x79" "\xa5\xd7\x00\x76\x93\xef\x3f\xf9\xd2\xb9\x93\xd1\x14\x44\x3d\x53\xc5" "\x30\x94\xe5\x16\xf6\x75\xb2\xa7\x07\x45\x84\x71\x4e\x7a\x20\x15\xe0" "\x5e\x50\x78\x11\xb4\xca\x89\xc3\x92\x81\xc9\xad\xa5\xf5\x8c\xeb\x55" "\x89\x3c\xca\x78\x3a\xb0\x9c\x9a\x19\x83\x6a\x3a\x2c\x71\x5b\x10\x43" "\x6a\x57\x31\x54\x9e\x36\x46\x79\xec\xd8\x46\x1a\x68\x43\x3a\xb5\x2b" "\x11\x08\x83\x1e\xdb\x96\x54\xdc\x60\x21\x83\xc1\x17\x0d\x68\x81\x64" "\x7f\x6d\xca\x15\xd5\x7f\xb7\x63\x57\xd8\x15\xc5\xf1\xbd\x2f\x36\x4c" "\xa6\x87\xc3\x0e\x4e\xc0\x75", 2336); *(uint64_t*)0x20000110 = 0x202bf000; memcpy((void*)0x202bf000, "syzkaller\000", 10); *(uint32_t*)0x20000118 = 4; *(uint32_t*)0x2000011c = 0x436; *(uint64_t*)0x20000120 = 0x20000040; *(uint32_t*)0x20000128 = 0; *(uint32_t*)0x2000012c = 0; memset((void*)0x20000130, 0, 16); *(uint32_t*)0x20000140 = 0; *(uint32_t*)0x20000144 = 0; *(uint32_t*)0x20000148 = -1; *(uint32_t*)0x2000014c = 8; *(uint64_t*)0x20000150 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000158 = 7; *(uint32_t*)0x2000015c = 0x10; *(uint64_t*)0x20000160 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0; *(uint32_t*)0x2000000c = 0; *(uint32_t*)0x20000168 = 0; *(uint32_t*)0x2000016c = 0; *(uint32_t*)0x20000170 = -1; *(uint32_t*)0x20000174 = 0; *(uint64_t*)0x20000178 = 0; res = syscall(__NR_bpf, 5ul, 0x20000100ul, 0x48ul); if (res != -1) r[0] = res; break; case 1: res = syscall(__NR_socket, 0x29ul, 5ul, 0); if (res != -1) r[1] = res; break; case 2: res = syscall(__NR_socket, 0xaul, 0x803ul, 6); if (res != -1) r[2] = res; break; case 3: *(uint16_t*)0x20000240 = 0xa; *(uint16_t*)0x20000242 = htobe16(0); *(uint32_t*)0x20000244 = htobe32(0); *(uint64_t*)0x20000248 = htobe64(0); *(uint64_t*)0x20000250 = htobe64(1); *(uint32_t*)0x20000258 = 0; syscall(__NR_connect, r[2], 0x20000240ul, 0x1cul); break; case 4: *(uint32_t*)0x20000180 = r[2]; *(uint32_t*)0x20000184 = r[0]; syscall(__NR_ioctl, r[1], 0x89e0, 0x20000180ul); break; case 5: *(uint64_t*)0x20002940 = 0; *(uint32_t*)0x20002948 = 0; *(uint64_t*)0x20002950 = 0x20002800; *(uint64_t*)0x20002800 = 0x20002980; *(uint64_t*)0x20002808 = 0xfffffde7; *(uint64_t*)0x20002958 = 1; *(uint64_t*)0x20002960 = 0; *(uint64_t*)0x20002968 = 0; *(uint32_t*)0x20002970 = 0; syscall(__NR_sendmsg, r[1], 0x20002940ul, 0ul); break; case 6: memcpy((void*)0x200001c0, "cgroup.controllers\000", 19); res = syscall(__NR_openat, 0xffffff9c, 0x200001c0ul, 0x275aul, 0ul); if (res != -1) r[3] = res; break; case 7: syscall(__NR_mmap, 0x20000000ul, 0xb36000ul, 2ul, 0x28011ul, r[3], 0ul); break; case 8: syscall(__NR_write, r[1], 0ul, 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; }