2 files changed, 45 insertions, 0 deletions

diff --git a/lib/cmdline.c b/lib/cmdline.c
index 76a712e6e20e..8f13cf73c2ec 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -160,3 +160,32 @@ unsigned long long memparse(const char *ptr, char **retptr)
         return ret;
 }
 EXPORT_SYMBOL(memparse);
+
+/**
+ *      parse_option_str - Parse a string and check an option is set or not
+ *      @str: String to be parsed
+ *      @option: option name
+ *
+ *      This function parses a string containing a comma-separated list of
+ *      strings like a=b,c.
+ *
+ *      Return true if there's such option in the string, or return false.
+ */
+bool parse_option_str(const char *str, const char *option)
+{
+        while (*str) {
+                if (!strncmp(str, option, strlen(option))) {
+                        str += strlen(option);
+                        if (!*str || *str == ',')
+                                return true;
+                }
+
+                while (*str && *str != ',')
+                        str++;
+
+                if (*str == ',')
+                        str++;
+        }
+
+        return false;
+}
diff --git a/lib/string.c b/lib/string.c
index 2fc20aa06f84..10063300b830 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -598,6 +598,22 @@ void *memset(void *s, int c, size_t count)
 EXPORT_SYMBOL(memset);
 #endif
 
+/**
+ * memzero_explicit - Fill a region of memory (e.g. sensitive
+ *                    keying data) with 0s.
+ * @s: Pointer to the start of the area.
+ * @count: The size of the area.
+ *
+ * memzero_explicit() doesn't need an arch-specific version as
+ * it just invokes the one of memset() implicitly.
+ */
+void memzero_explicit(void *s, size_t count)
+{
+        memset(s, 0, count);
+        OPTIMIZER_HIDE_VAR(s);
+}
+EXPORT_SYMBOL(memzero_explicit);
+
 #ifndef __HAVE_ARCH_MEMCPY
 /**
  * memcpy - Copy one area of memory to another