// https://syzkaller.appspot.com/bug?id=c762aca4681b54e03b6ff2b66667d2c382a0f612 // 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)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } uint64_t r[1] = {0xffffffffffffffff}; void loop() { long res; memcpy((void*)0x20000040, "/dev/sg#", 9); res = syz_open_dev(0x20000040, 0, 0); if (res != -1) r[0] = res; syscall(__NR_fcntl, r[0], 4, 0x2000); *(uint64_t*)0x20000380 = 0x20000080; *(uint64_t*)0x20000388 = 0x9d; *(uint64_t*)0x20000390 = 0x20000140; *(uint64_t*)0x20000398 = 0xbb; *(uint64_t*)0x200003a0 = 0x20000200; *(uint64_t*)0x200003a8 = 0xf3; *(uint64_t*)0x200003b0 = 0x20000000; *(uint64_t*)0x200003b8 = 0x3c; *(uint64_t*)0x200003c0 = 0x20000300; *(uint64_t*)0x200003c8 = 0x7f; syscall(__NR_readv, r[0], 0x20000380, 5); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }