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fuse: Ensure posix acls are translated outside of init_user_ns

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Ensure the translation happens by failing to read or write
posix acls when the filesystem has not indicated it supports
posix acls.

This ensures that modern cached posix acl support is available
and used when dealing with posix acls.  This is important
because only that path has the code to convernt the uids and
gids in posix acls into the user namespace of a fuse filesystem.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Eric W. Biederman
2018-05-04 11:47:28 -05:00
committed by Miklos Szeredi
parent 5ba24197b9
commit e45b2546e2
3 changed files with 51 additions and 0 deletions
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7
fs/fuse/inode.c
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@@ -1100,6 +1100,13 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
file->f_cred->user_ns != sb->s_user_ns)
goto err_fput;
/*
* If we are not in the initial user namespace posix
* acls must be translated.
*/
if (sb->s_user_ns != &init_user_ns)
sb->s_xattr = fuse_no_acl_xattr_handlers;
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
err = -ENOMEM;
if (!fc)