// https://syzkaller.appspot.com/bug?id=28bc35dd6f026b2878e30804670f6f0c39932f16 // 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); } } static void execute_one(); extern unsigned long long procid; void loop() { while (1) { execute_one(); } } uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one() { long res = 0; memcpy((void*)0x20ca9ff5, "/dev/loop#", 11); res = syz_open_dev(0x20ca9ff5, 0, 0); if (res != -1) r[0] = res; memcpy((void*)0x20000040, "/dev/loop#", 11); res = syz_open_dev(0x20000040, 0x8000400000000c9, 0); if (res != -1) r[1] = res; syscall(__NR_ioctl, r[1], 0x4c00, r[0]); memcpy((void*)0x20000080, "/dev/md0", 9); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000080, 0, 0); if (res != -1) r[2] = res; memcpy((void*)0x20000200, "/dev/loop#", 11); res = syz_open_dev(0x20000200, 0, 0); if (res != -1) r[3] = res; syscall(__NR_ioctl, r[3], 0x4c00, r[2]); syscall(__NR_ioctl, r[3], 0x4c06, r[3]); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }