->permission() sanitizing: MAY_NOT_BLOCK

Duplicate the flags argument into mask bitmap.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/namei.c b/fs/namei.c
index c5af0f37e67d..723a3fe4bc40 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -318,13 +318,16 @@ static inline int exec_permission(struct inode *inode, unsigned int flags)
 {
         int ret;
         struct user_namespace *ns = inode_userns(inode);
+        int mask = MAY_EXEC;
+        if (flags & IPERM_FLAG_RCU)
+                mask |= MAY_NOT_BLOCK;
 
         if (inode->i_op->permission) {
-                ret = inode->i_op->permission(inode, MAY_EXEC, flags);
+                ret = inode->i_op->permission(inode, mask, flags);
                 if (likely(!ret))
                         goto ok;
         } else {
-                ret = acl_permission_check(inode, MAY_EXEC, flags);
+                ret = acl_permission_check(inode, mask, flags);
                 if (likely(!ret))
                         goto ok;
                 if (ret != -EACCES)