read_environment_file(char ***env, u_int *envsize,
	const char *filename)
{
	FILE *f;
	char buf[4096];
	char *cp, *value;
	u_int lineno = 0;

	f = fopen(filename, "r");
	if (!f)
		return;

	while (fgets(buf, sizeof(buf), f)) {
		if (++lineno > 1000)
			fatal("Too many lines in environment file %s", filename);
		for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
			;
		if (!*cp || *cp == '#' || *cp == '\n')
			continue;

		cp[strcspn(cp, "\n")] = '\0';

		value = strchr(cp, '=');
		if (value == NULL) {
			fprintf(stderr, "Bad line %u in %.100s\n", lineno,
			    filename);
			continue;
		}
		/*
		 * Replace the equals sign by nul, and advance value to
		 * the value string.
		 */
		*value = '\0';
		value++;
		child_set_env(env, envsize, cp, value);
	}
	fclose(f);
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.