LSM: Refactor "security=" in terms of enable/disable (7e611486) · Commits · 戴 / test

security/security.c

+20 −8

Original line number	Diff line number	Diff line
		@@ -129,14 +129,6 @@ static bool __init lsm_allowed(struct lsm_info *lsm)
		if (!is_enabled(lsm))
		return false;

		/* Skip major-specific checks if not a major LSM. */
		if ((lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0)
		return true;

		/* Disabled if this LSM isn't the chosen one. */
		if (strcmp(lsm->name, chosen_major_lsm) != 0)
		return false;

		return true;
		}

		@@ -164,8 +156,28 @@ static void __init ordered_lsm_parse(const char order, const char origin)
		struct lsm_info *lsm;
		char sep, name, *next;

		/* Process "security=", if given. */
		if (!chosen_major_lsm)
		chosen_major_lsm = CONFIG_DEFAULT_SECURITY;
		if (chosen_major_lsm) {
		struct lsm_info *major;

		/*
		* To match the original "security=" behavior, this
		* explicitly does NOT fallback to another Legacy Major
		* if the selected one was separately disabled: disable
		* all non-matching Legacy Major LSMs.
		*/
		for (major = __start_lsm_info; major < __end_lsm_info;
		major++) {
		if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
		strcmp(major->name, chosen_major_lsm) != 0) {
		set_enabled(major, false);
		init_debug("security=%s disabled: %s\n",
		chosen_major_lsm, major->name);
		}
		}
		}

		sep = kstrdup(order, GFP_KERNEL);
		next = sep;