// https://syzkaller.appspot.com/bug?id=3153e27944712d6149bbd81691fdcdc7cbdc0e60 // 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(); } } #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one() { long res = 0; memcpy((void*)0x20000280, "/dev/loop#", 11); res = syz_open_dev(0x20000280, 0, 0); if (res != -1) r[0] = res; memcpy((void*)0x20000140, "\x00\x00\x00\x00\x8c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 15); res = syscall(__NR_memfd_create, 0x20000140, 2); if (res != -1) r[1] = res; *(uint64_t*)0x20f50f90 = 0x20000100; memcpy((void*)0x20000100, "\xa8", 1); *(uint64_t*)0x20f50f98 = 1; syscall(__NR_pwritev, r[1], 0x20f50f90, 1, 0x81003); syscall(__NR_ioctl, r[0], 0x4c00, r[1]); syscall(__NR_ioctl, r[0], 0x4c06, r[0]); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }