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ovl: add warning on user_ns mismatch 

Currently there's no way to create an overlay filesystem outside of the
current user namespace.  Make sure that if this assumption changes it
doesn't go unnoticed.

Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2021-01-28 10:22:48 +01:00
parent 19c329f680
commit 9efb069de4
1 changed files with 4 additions and 0 deletions
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4
fs/overlayfs/super.c
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@ -1923,6 +1923,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
unsigned int numlower;
int err;
err = -EIO;
if (WARN_ON(sb->s_user_ns != current_user_ns()))
goto out;
sb->s_d_op = &ovl_dentry_operations;
err = -ENOMEM;