// https://syzkaller.appspot.com/bug?id=2e663063024ae9f2ad3ec70a56744869ba1556a3 // 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 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) { if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } int i, call, thread; for (call = 0; call < 3; 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 + (call == 1 ? 500 : 0)); 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 (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: *(uint32_t*)0x2000000000c0 = 0x11; *(uint32_t*)0x2000000000c4 = 0x13; *(uint64_t*)0x2000000000c8 = 0x200000000880; *(uint8_t*)0x200000000880 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200000000881, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000881, 0, 4, 4); *(uint16_t*)0x200000000882 = 0; *(uint32_t*)0x200000000884 = 0x200; *(uint8_t*)0x200000000888 = 0; *(uint8_t*)0x200000000889 = 0; *(uint16_t*)0x20000000088a = 0; *(uint32_t*)0x20000000088c = 0; *(uint8_t*)0x200000000890 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200000000891, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000891, 0, 4, 4); *(uint16_t*)0x200000000892 = 0; *(uint32_t*)0x200000000894 = 0x256c7520; *(uint8_t*)0x200000000898 = 0; *(uint8_t*)0x200000000899 = 0; *(uint16_t*)0x20000000089a = 0; *(uint32_t*)0x20000000089c = 0x20202000; STORE_BY_BITMASK(uint8_t, , 0x2000000008a0, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008a0, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x2000000008a0, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008a1, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008a1, 1, 4, 4); *(uint16_t*)0x2000000008a2 = 0xfff8; *(uint32_t*)0x2000000008a4 = 0; STORE_BY_BITMASK(uint8_t, , 0x2000000008a8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008a8, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008a8, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008a9, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008a9, 0xa, 4, 4); *(uint16_t*)0x2000000008aa = 0; *(uint32_t*)0x2000000008ac = 0; STORE_BY_BITMASK(uint8_t, , 0x2000000008b0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008b0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008b0, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008b1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008b1, 0, 4, 4); *(uint16_t*)0x2000000008b2 = 0; *(uint32_t*)0x2000000008b4 = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x2000000008b8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008b8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008b8, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008b9, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008b9, 0, 4, 4); *(uint16_t*)0x2000000008ba = 0; *(uint32_t*)0x2000000008bc = 8; STORE_BY_BITMASK(uint8_t, , 0x2000000008c0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008c0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008c0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008c1, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008c1, 0, 4, 4); *(uint16_t*)0x2000000008c2 = 0; *(uint32_t*)0x2000000008c4 = 1; *(uint8_t*)0x2000000008c8 = 0x85; *(uint8_t*)0x2000000008c9 = 0; *(uint16_t*)0x2000000008ca = 0; *(uint32_t*)0x2000000008cc = 0x2d; *(uint8_t*)0x2000000008d0 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x2000000008d1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008d1, 0, 4, 4); *(uint16_t*)0x2000000008d2 = 0; *(uint32_t*)0x2000000008d4 = 0x256c6c64; *(uint8_t*)0x2000000008d8 = 0; *(uint8_t*)0x2000000008d9 = 0; *(uint16_t*)0x2000000008da = 0; *(uint32_t*)0x2000000008dc = 0x20202000; STORE_BY_BITMASK(uint8_t, , 0x2000000008e0, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008e0, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x2000000008e0, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008e1, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008e1, 1, 4, 4); *(uint16_t*)0x2000000008e2 = 0xfff8; *(uint32_t*)0x2000000008e4 = 0; STORE_BY_BITMASK(uint8_t, , 0x2000000008e8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008e8, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008e8, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008e9, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008e9, 0xa, 4, 4); *(uint16_t*)0x2000000008ea = 0; *(uint32_t*)0x2000000008ec = 0; STORE_BY_BITMASK(uint8_t, , 0x2000000008f0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008f0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008f0, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008f1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008f1, 0, 4, 4); *(uint16_t*)0x2000000008f2 = 0; *(uint32_t*)0x2000000008f4 = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x2000000008f8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x2000000008f8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x2000000008f8, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008f9, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x2000000008f9, 0, 4, 4); *(uint16_t*)0x2000000008fa = 0; *(uint32_t*)0x2000000008fc = 8; STORE_BY_BITMASK(uint8_t, , 0x200000000900, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000900, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000900, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000901, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000901, 0, 4, 4); *(uint16_t*)0x200000000902 = 0; *(uint32_t*)0x200000000904 = 0x42; *(uint8_t*)0x200000000908 = 0x85; *(uint8_t*)0x200000000909 = 0; *(uint16_t*)0x20000000090a = 0; *(uint32_t*)0x20000000090c = 6; *(uint8_t*)0x200000000910 = 0x95; *(uint8_t*)0x200000000911 = 0; *(uint16_t*)0x200000000912 = 0; *(uint32_t*)0x200000000914 = 0; *(uint64_t*)0x2000000000d0 = 0x200000000000; memcpy((void*)0x200000000000, "GPL\000", 4); *(uint32_t*)0x2000000000d8 = 0; *(uint32_t*)0x2000000000dc = 0; *(uint64_t*)0x2000000000e0 = 0; *(uint32_t*)0x2000000000e8 = 0; *(uint32_t*)0x2000000000ec = 0; memset((void*)0x2000000000f0, 0, 16); *(uint32_t*)0x200000000100 = 0; *(uint32_t*)0x200000000104 = 0; *(uint32_t*)0x200000000108 = -1; *(uint32_t*)0x20000000010c = 0; *(uint64_t*)0x200000000110 = 0; *(uint32_t*)0x200000000118 = 0; *(uint32_t*)0x20000000011c = 0; *(uint64_t*)0x200000000120 = 0; *(uint32_t*)0x200000000128 = 0; *(uint32_t*)0x20000000012c = 0; *(uint32_t*)0x200000000130 = 0; *(uint32_t*)0x200000000134 = 0; *(uint64_t*)0x200000000138 = 0; *(uint64_t*)0x200000000140 = 0; *(uint32_t*)0x200000000148 = 0; *(uint32_t*)0x20000000014c = 0; *(uint32_t*)0x200000000150 = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x2000000000c0ul, /*size=*/0x94ul); if (res != -1) r[0] = res; break; case 1: *(uint64_t*)0x200000000980 = 0x200000000940; memcpy((void*)0x200000000940, "tlb_flush\000", 10); *(uint32_t*)0x200000000988 = r[0]; *(uint32_t*)0x20000000098c = 0; *(uint64_t*)0x200000000990 = 0; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200000000980ul, /*size=*/0x10ul); break; case 2: *(uint32_t*)0x200000000140 = 2; *(uint32_t*)0x200000000144 = 0x80; *(uint8_t*)0x200000000148 = 0x9a; *(uint8_t*)0x200000000149 = 0; *(uint8_t*)0x20000000014a = 0; *(uint8_t*)0x20000000014b = 0; *(uint32_t*)0x20000000014c = 0; *(uint64_t*)0x200000000150 = 0; *(uint64_t*)0x200000000158 = 0; *(uint64_t*)0x200000000160 = 0xc; STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 29, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 30, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 31, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 32, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 33, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 34, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 35, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 36, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 37, 1); STORE_BY_BITMASK(uint64_t, , 0x200000000168, 0, 38, 26); *(uint32_t*)0x200000000170 = 0; *(uint32_t*)0x200000000174 = 0; *(uint64_t*)0x200000000178 = 0x29; *(uint64_t*)0x200000000180 = 4; *(uint64_t*)0x200000000188 = 0; *(uint64_t*)0x200000000190 = 0; *(uint32_t*)0x200000000198 = 0; *(uint32_t*)0x20000000019c = 4; *(uint64_t*)0x2000000001a0 = 0; *(uint32_t*)0x2000000001a8 = 0; *(uint16_t*)0x2000000001ac = 0; *(uint16_t*)0x2000000001ae = 0; *(uint32_t*)0x2000000001b0 = 0; *(uint32_t*)0x2000000001b4 = 0; *(uint64_t*)0x2000000001b8 = 0; syscall(__NR_perf_event_open, /*attr=*/0x200000000140ul, /*pid=*/0, /*cpu=*/1ul, /*group=*/(intptr_t)-1, /*flags=*/0ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; loop(); return 0; }