[PATCH v13 32/51] richacl: Set the other permissions to the other mask

Andreas Gruenbacher
2015-11-03T15:21:20Z

Change the acl so that everyone@ is granted the permissions set in the
other mask.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_compat.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index d9fee8b..76183c9 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -462,3 +462,44 @@ richacl_set_owner_permissions(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * richacl_set_other_permissions - set the other permissions to the other mask
+ * @alloc: acl and number of allocated entries
+ * @added: permissions added for everyone@
+ *
+ * Change the acl so that everyone@ is granted the permissions set in the other
+ * mask. This leaves at most one efective everyone@ allow entry at the end of
+ * the acl. If everyone@ end up being granted additional permissions, these
+ * permissions are returned in @added.
+ */
+static int
+richacl_set_other_permissions(struct richacl_alloc *alloc, unsigned int *added)
+{
+ struct richacl *acl = alloc->acl;
+ unsigned int x = RICHACE_POSIX_ALWAYS_ALLOWED;
+ unsigned int other_mask = acl->a_other_mask & ~x;
+ struct richace *ace;
+
+ if (!(other_mask &&
+ (acl->a_flags & RICHACL_WRITE_THROUGH)))
+ return 0;
+
+ *added = other_mask;
+ ace = acl->a_entries + acl->a_count - 1;
+ if (acl->a_count == 0 ||
+ !richace_is_everyone(ace) ||
+ richace_is_inherit_only(ace)) {
+ ace++;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = other_mask;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ } else {
+ *added &= ~ace->e_mask;
+ richace_change_mask(alloc, &ace, other_mask);
+ }
+ return 0;
+}