[Devel] [PATCH RHEL7 COMMIT] Revert "ms/vfs: Don't create inodes with a uid or gid unknown to the vfs"

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-514.26.1.vz7.33.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-514.26.1.vz7.33.12
------>
commit 1590b19d07aa60f8852f44705ce2834b2c854d49
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Fri Jul 21 11:57:13 2017 +0400

    Revert "ms/vfs: Don't create inodes with a uid or gid unknown to the vfs"
    
    This reverts commit f491a81f0d902f8188236e028b35e2376e389f57.
    
    Temporary revert due to
    https://jira.sw.ru/browse/PSBM-68599
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 fs/namei.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 42a0e6b..74abaeb 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2636,22 +2636,16 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
  *  1. We can't do it if child already exists (open has special treatment for
  *     this case, but since we are inlined it's OK)
  *  2. We can't do it if dir is read-only (done in permission())
- *  3. We can't do it if the fs can't represent the fsuid or fsgid.
- *  4. We should have write and exec permissions on dir
- *  5. We can't do it if dir is immutable (done in permission())
+ *  3. We should have write and exec permissions on dir
+ *  4. We can't do it if dir is immutable (done in permission())
  */
 static inline int may_create(struct inode *dir, struct dentry *child)
 {
-	struct user_namespace *s_user_ns;
 	audit_inode_child(dir, child, AUDIT_TYPE_CHILD_CREATE);
 	if (child->d_inode)
 		return -EEXIST;
 	if (IS_DEADDIR(dir))
 		return -ENOENT;
-	s_user_ns = dir->i_sb->s_user_ns;
-	if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
-	    !kgid_has_mapping(s_user_ns, current_fsgid()))
-		return -EOVERFLOW;
 	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
 }