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-rw-r--r--security/security.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index 549bddcc2116..54b1e395978a 100644
--- a/security/security.c
+++ b/security/security.c
@@ -25,6 +25,7 @@
#include <linux/mount.h>
#include <linux/personality.h>
#include <linux/backing-dev.h>
+#include <linux/string.h>
#include <net/flow.h>
#define MAX_LSM_EVM_XATTR 2
@@ -86,6 +87,21 @@ static int __init choose_lsm(char *str)
}
__setup("security=", choose_lsm);
+static bool match_last_lsm(const char *list, const char *lsm)
+{
+ const char *last;
+
+ if (WARN_ON(!list || !lsm))
+ return false;
+ last = strrchr(list, ',');
+ if (last)
+ /* Pass the comma, strcmp() will check for '\0' */
+ last++;
+ else
+ last = list;
+ return !strcmp(last, lsm);
+}
+
static int lsm_append(char *new, char **result)
{
char *cp;
@@ -93,6 +109,9 @@ static int lsm_append(char *new, char **result)
if (*result == NULL) {
*result = kstrdup(new, GFP_KERNEL);
} else {
+ /* Check if it is the last registered name */
+ if (match_last_lsm(*result, new))
+ return 0;
cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
if (cp == NULL)
return -ENOMEM;