// https://syzkaller.appspot.com/bug?id=cb6086765baf19daf766754bd80aeba3d8108498 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; 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); intptr_t res = 0; memcpy((void*)0x20000000, "/dev/nbd#\000", 10); res = -1; res = syz_open_dev(0x20000000, 0, 0); if (res != -1) r[0] = res; syscall(__NR_ioctl, r[0], 0xab0a, 0x3fful); memcpy((void*)0x20000700, "/dev/nbd#\000", 10); res = -1; res = syz_open_dev(0x20000700, 0, 0); if (res != -1) r[1] = res; res = syscall(__NR_socketpair, 1ul, 1ul, 0, 0x20000080ul); if (res != -1) r[2] = *(uint32_t*)0x20000080; syscall(__NR_ioctl, r[1], 0xab00, r[2]); memcpy((void*)0x20000040, "/dev/nbd#\000", 10); res = -1; res = syz_open_dev(0x20000040, 0, 0); if (res != -1) r[3] = res; syscall(__NR_ioctl, r[1], 0xab00, r[2]); syscall(__NR_ioctl, r[3], 0xab03, 0); return 0; }