| // INFO: task hung in fuse_reverse_inval_entry |
| // https://syzkaller.appspot.com/bug?id=ae8cd67e7e816f210105fee7719de41d6bcd010c |
| // status:open |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| struct thread_t { |
| int created, running, call; |
| pthread_t th; |
| }; |
| |
| 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 (;;) { |
| while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); |
| execute_call(th->call); |
| __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| } |
| return 0; |
| } |
| |
| static void execute(int num_calls) |
| { |
| int call, thread; |
| running = 0; |
| for (call = 0; call < num_calls; call++) { |
| for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { |
| struct thread_t* th = &threads[thread]; |
| if (!th->created) { |
| th->created = 1; |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setstacksize(&attr, 128 << 10); |
| pthread_create(&th->th, &attr, thr, th); |
| } |
| if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { |
| th->call = call; |
| __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| struct timespec ts; |
| ts.tv_sec = 0; |
| ts.tv_nsec = 20 * 1000 * 1000; |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); |
| if (__atomic_load_n(&running, __ATOMIC_RELAXED)) |
| usleep((call == num_calls - 1) ? 10000 : 1000); |
| break; |
| } |
| } |
| } |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x20000000, "./file0", 8); |
| syscall(__NR_mkdirat, 0xffffff9c, 0x20000000, 0); |
| break; |
| case 1: |
| memcpy((void*)0x20000640, "/dev/fuse", 10); |
| res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000640, 2, 0); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 2: |
| memcpy((void*)0x20000200, "./file0", 8); |
| memcpy((void*)0x20000300, "fuse", 5); |
| memcpy((void*)0x20000400, "fd", 2); |
| *(uint8_t*)0x20000402 = 0x3d; |
| sprintf((char*)0x20000403, "0x%016llx", (long long)r[0]); |
| *(uint8_t*)0x20000415 = 0x2c; |
| memcpy((void*)0x20000416, "rootmode", 8); |
| *(uint8_t*)0x2000041e = 0x3d; |
| sprintf((char*)0x2000041f, "%023llo", (long long)0x4000); |
| *(uint8_t*)0x20000436 = 0x2c; |
| memcpy((void*)0x20000437, "user_id", 7); |
| *(uint8_t*)0x2000043e = 0x3d; |
| sprintf((char*)0x2000043f, "%020llu", (long long)0); |
| *(uint8_t*)0x20000453 = 0x2c; |
| memcpy((void*)0x20000454, "group_id", 8); |
| *(uint8_t*)0x2000045c = 0x3d; |
| sprintf((char*)0x2000045d, "%020llu", (long long)0); |
| *(uint8_t*)0x20000471 = 0x2c; |
| *(uint8_t*)0x20000472 = 0; |
| syscall(__NR_mount, 0, 0x20000200, 0x20000300, 0, 0x20000400); |
| break; |
| case 3: |
| syscall(__NR_read, r[0], 0x20002000, 0x1000); |
| break; |
| case 4: |
| syscall(__NR_pread64, r[0], 0x20000540, 0xec, 0); |
| break; |
| case 5: |
| *(uint32_t*)0x20000100 = 0x50; |
| *(uint32_t*)0x20000104 = 0; |
| *(uint64_t*)0x20000108 = 1; |
| *(uint32_t*)0x20000110 = 7; |
| *(uint32_t*)0x20000114 = 0x1b; |
| *(uint32_t*)0x20000118 = 0; |
| *(uint32_t*)0x2000011c = 0; |
| *(uint16_t*)0x20000120 = 0; |
| *(uint16_t*)0x20000122 = 0; |
| *(uint32_t*)0x20000124 = 0; |
| *(uint32_t*)0x20000128 = 0; |
| *(uint32_t*)0x2000012c = 0; |
| *(uint32_t*)0x20000130 = 0; |
| *(uint32_t*)0x20000134 = 0; |
| *(uint32_t*)0x20000138 = 0; |
| *(uint32_t*)0x2000013c = 0; |
| *(uint32_t*)0x20000140 = 0; |
| *(uint32_t*)0x20000144 = 0; |
| *(uint32_t*)0x20000148 = 0; |
| *(uint32_t*)0x2000014c = 0; |
| syscall(__NR_write, r[0], 0x20000100, 0x50); |
| break; |
| case 6: |
| memcpy((void*)0x20000500, "./file0/file0", 14); |
| syscall(__NR_mkdirat, 0xffffff9c, 0x20000500, 0); |
| break; |
| case 7: |
| *(uint32_t*)0x200000c0 = 0x29; |
| *(uint32_t*)0x200000c4 = 3; |
| *(uint64_t*)0x200000c8 = 0; |
| *(uint64_t*)0x200000d0 = 1; |
| *(uint32_t*)0x200000d8 = 8; |
| *(uint32_t*)0x200000dc = 0; |
| memcpy((void*)0x200000e0, "group_id", 8); |
| *(uint8_t*)0x200000e8 = 0; |
| syscall(__NR_write, r[0], 0x200000c0, 0x29); |
| break; |
| } |
| } |
| |
| void loop() |
| { |
| execute(8); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| loop(); |
| return 0; |
| } |