When we have non-owner user or group entries, we need the mask
for the acl to be valid. But acl_calc_mask() calculates the mask
to include all permissions, even those that were masked before.
Apparently this happens when we inherit *:r-x permissions from
a parent directory — the kernel sets *:r-x, mask:r--, effectively
masking the executable bit. acl_calc_mask() would set the mask:r-x,
effectively enabling the bit. To avoid this, be more conservative when
to add the mask entry: first iterate over all entries, and do nothing
if a mask.
This returns the code closer to J.A.Steffens' original version
in
v204-90-g23ad4dd884.
Should fix https://github.com/elogind/elogind/issues/1977.
int calc_acl_mask_if_needed(acl_t *acl_p) {
acl_entry_t i;
int r;
+ bool need = false;
assert(acl_p);
if (tag == ACL_MASK)
return 0;
- if (IN_SET(tag, ACL_USER, ACL_GROUP)) {
- if (acl_calc_mask(acl_p) < 0)
- return -errno;
-
- return 1;
- }
+ if (IN_SET(tag, ACL_USER, ACL_GROUP))
+ need = true;
}
if (r < 0)
return -errno;
- return 0;
+ if (need && acl_calc_mask(acl_p) < 0)
+ return -errno;
+
+ return need;
}
int add_base_acls_if_needed(acl_t *acl_p, const char *path) {