#include #include #include #include #include #include #include #define DEVNAME "tmpdev" static void fuzzer(mode_t type) { mode_t mode = type | (S_IRUSR | S_IWUSR); unsigned int major, minor; int retval, saved_errno; unlink(DEVNAME); for (major = 0; major < 1024; major++) for (minor = 0; minor < 256; minor++) { retval = mknod(DEVNAME, mode, makedev(major, minor)); if (retval == -1) { saved_errno = errno; unlink(DEVNAME); printf("mknod %c %u %u = -1 errno=%d (\"%s\")\n", "cb"[type == S_IFBLK], major, minor, saved_errno, strerror(saved_errno)); continue; } retval = open(DEVNAME, O_RDONLY | O_NOCTTY); saved_errno = errno; unlink(DEVNAME); if (retval >= 0) close(retval); printf("open %c %u %u = %d", "cb"[type == S_IFBLK], major, minor, retval); if (retval == -1) printf(" errno=%d (\"%s\")", saved_errno, strerror(saved_errno)); putchar('\n'); } } int main(void) { fuzzer(S_IFCHR); fuzzer(S_IFBLK); return 0; }

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