4 files changed, 72 insertions, 3 deletions

diff --git a/src/basic/strv.c b/src/basic/strv.c
index b66c176487..501d022cb9 100644
--- a/src/basic/strv.c
+++ b/src/basic/strv.c
@@ -86,6 +86,15 @@ char **strv_free(char **l) {
         return NULL;
 }
 
+char **strv_free_erase(char **l) {
+        char **i;
+
+        STRV_FOREACH(i, l)
+                string_erase(*i);
+
+        return strv_free(l);
+}
+
 char **strv_copy(char * const *l) {
         char **r, **k;
 
diff --git a/src/basic/strv.h b/src/basic/strv.h
index e49f443835..a5dc696a87 100644
--- a/src/basic/strv.h
+++ b/src/basic/strv.h
@@ -35,6 +35,10 @@ char **strv_free(char **l);
 DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free);
 #define _cleanup_strv_free_ _cleanup_(strv_freep)
 
+char **strv_free_erase(char **l);
+DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free_erase);
+#define _cleanup_strv_free_erase_ _cleanup_(strv_free_erasep)
+
 void strv_clear(char **l);
 
 char **strv_copy(char * const *l);
diff --git a/src/basic/util.c b/src/basic/util.c
index 2565b0f547..3e90456dd3 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -2500,11 +2500,35 @@ char *getusername_malloc(void) {
         return lookup_uid(getuid());
 }
 
-bool is_temporary_fs(const struct statfs *s) {
+bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
         assert(s);
+        assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));
+
+        return F_TYPE_EQUAL(s->f_type, magic_value);
+}
+
+int fd_check_fstype(int fd, statfs_f_type_t magic_value) {
+        struct statfs s;
+
+        if (fstatfs(fd, &s) < 0)
+                return -errno;
+
+        return is_fs_type(&s, magic_value);
+}
+
+int path_check_fstype(const char *path, statfs_f_type_t magic_value) {
+        _cleanup_close_ int fd = -1;
+
+        fd = open(path, O_RDONLY);
+        if (fd < 0)
+                return -errno;
 
-        return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
-               F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
+        return fd_check_fstype(fd, magic_value);
+}
+
+bool is_temporary_fs(const struct statfs *s) {
+    return is_fs_type(s, TMPFS_MAGIC) ||
+           is_fs_type(s, RAMFS_MAGIC);
 }
 
 int fd_is_temporary_fs(int fd) {
@@ -6805,3 +6829,22 @@ bool fdname_is_valid(const char *s) {
 bool oom_score_adjust_is_valid(int oa) {
         return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
 }
+
+void string_erase(char *x) {
+
+        if (!x)
+                return;
+
+        /* A delicious drop of snake-oil! To be called on memory where
+         * we stored passphrases or so, after we used them. */
+
+        memory_erase(x, strlen(x));
+}
+
+char *string_free_erase(char *s) {
+        if (!s)
+                return NULL;
+
+        string_erase(s);
+        return mfree(s);
+}
diff --git a/src/basic/util.h b/src/basic/util.h
index 6c63bc221f..ff39eae715 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -365,6 +365,12 @@ char* getusername_malloc(void);
 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
 
+typedef long statfs_f_type_t;
+
+bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) _pure_;
+int fd_check_fstype(int fd, statfs_f_type_t magic_value);
+int path_check_fstype(const char *path, statfs_f_type_t magic_value);
+
 bool is_temporary_fs(const struct statfs *s) _pure_;
 int fd_is_temporary_fs(int fd);
 
@@ -943,3 +949,10 @@ int version(void);
 bool fdname_is_valid(const char *s);
 
 bool oom_score_adjust_is_valid(int oa);
+
+#define memory_erase(p, l) memset((p), 'x', (l))
+void string_erase(char *x);
+
+char *string_free_erase(char *s);
+DEFINE_TRIVIAL_CLEANUP_FUNC(char *, string_free_erase);
+#define _cleanup_string_free_erase_ _cleanup_(string_free_erasep)