// https://syzkaller.appspot.com/bug?id=8e19ba554bec5880000ece8c8fb76ba69291d43d // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t 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); } } #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void loop() { long res = 0; memcpy((void*)0x20000100, "/dev/loop#", 11); res = syz_open_dev(0x20000100, 0xbffffffffffffffe, 0x88); if (res != -1) r[0] = res; memcpy((void*)0x20000140, "/dev/loop#", 11); res = syscall(__NR_memfd_create, 0x20000140, 0); if (res != -1) r[1] = res; *(uint64_t*)0x20000900 = 0x200009c0; memcpy((void*)0x200009c0, "\x1f", 1); *(uint64_t*)0x20000908 = 1; syscall(__NR_pwritev, r[1], 0x20000900, 1, 0x81a06); syscall(__NR_ioctl, r[0], 0x4c00, r[1]); syscall(__NR_ioctl, r[0], 0x4c06, r[0]); *(uint64_t*)0x20000000 = 0; syscall(__NR_sendfile, r[1], r[0], 0x20000000, 0x20000102000007); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }