journald: DO recalculate the ACL mask, but only if it doesn't exist

Since 11ec7ce, journald isn't setting the ACLs properly anymore if
the files had no ACLs to begin with: acl_set_fd fails with EINVAL.

An ACL with ACL_USER or ACL_GROUP entries but no ACL_MASK entry is
invalid, so make sure a mask exists before trying to set the ACL.

2 files changed, 29 insertions, 0 deletions

diff --git a/src/shared/acl-util.c b/src/shared/acl-util.c
index 48bb12f46b..fb04e49dc4 100644
--- a/src/shared/acl-util.c
+++ b/src/shared/acl-util.c
@@ -69,6 +69,34 @@ int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry) {
         return 0;
 }
 
+int calc_acl_mask_if_needed(acl_t *acl_p) {
+        acl_entry_t i;
+        int found;
+
+        assert(acl_p);
+
+        for (found = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
+             found > 0;
+             found = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
+
+                acl_tag_t tag;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if (tag == ACL_MASK)
+                        return 0;
+        }
+
+        if (found < 0)
+                return -errno;
+
+        if (acl_calc_mask(acl_p) < 0)
+                return -errno;
+
+        return 0;
+}
+
 int search_acl_groups(char*** dst, const char* path, bool* belong) {
         acl_t acl;
 
diff --git a/src/shared/acl-util.h b/src/shared/acl-util.h
index 23090d9984..36ef490d7e 100644
--- a/src/shared/acl-util.h
+++ b/src/shared/acl-util.h
@@ -24,4 +24,5 @@
 #include <stdbool.h>
 
 int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry);
+int calc_acl_mask_if_needed(acl_t *acl_p);
 int search_acl_groups(char*** dst, const char* path, bool* belong);