fs-util: introduce fchmod_and_chown()

[elogind.git] / src / basic / fs-util.c

diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c
index 81d51bb664b944b519591478bff3aee6718fa7f3..1f27657379032d2a777fdb19891432394f80d601 100644 (file)
--- a/src/basic/fs-util.c
+++ b/src/basic/fs-util.c
@@ -239,6 +239,22 @@ int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
         return 0;
 }
 
+int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid) {
+        /* Under the assumption that we are running privileged we
+         * first change the access mode and only then hand out
+         * ownership to avoid a window where access is too open. */
+
+        if (mode != MODE_INVALID)
+                if (fchmod(fd, mode) < 0)
+                        return -errno;
+
+        if (uid != UID_INVALID || gid != GID_INVALID)
+                if (fchown(fd, uid, gid) < 0)
+                        return -errno;
+
+        return 0;
+}
+
 int fchmod_umask(int fd, mode_t m) {
         mode_t u;
         int r;