// https://syzkaller.appspot.com/bug?id=4b78eb9b41c4ee2e5684ee984581c9cbe59e1940 // 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); } } #ifndef __NR_ioctl #define __NR_ioctl 54 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x1ffff000, 0x1000, 0, 0x32, -1, 0); syscall(__NR_mmap, 0x20000000, 0x1000000, 7, 0x32, -1, 0); syscall(__NR_mmap, 0x21000000, 0x1000, 0, 0x32, -1, 0); intptr_t res = 0; memcpy((void*)0x20000000, "/dev/i2c-#\000", 11); res = -1; res = syz_open_dev(0x20000000, 0, 0); if (res != -1) r[0] = res; *(uint32_t*)0x200014c0 = 0; *(uint32_t*)0x200014c4 = 0; syscall(__NR_ioctl, (intptr_t)r[0], 0x707, 0x200014c0); return 0; }