linux-kernel - [PATCH v13 43/51] ext4: Don't allow unmapped identifiers in richacls

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Message-Id: <1446563847-14005-44-git-send-email-agruenba@redhat.com>
Date:	Tue,  3 Nov 2015 16:17:19 +0100
From:	Andreas Gruenbacher <agruenba@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-api@...r.kernel.org
Cc:	Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH v13 43/51] ext4: Don't allow unmapped identifiers in richacls

Don't allow acls which contain unmapped identifiers: they are meaningful
for remote file systems only.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
 fs/ext4/richacl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
index 906d048..2115385 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -74,6 +74,10 @@ __ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
 	int retval, size;
 	void *value;
 
+	/* Don't allow acls with unmapped identifiers. */
+	if (richacl_has_unmapped_identifiers(acl))
+		return -EINVAL;
+
 	if (richacl_equiv_mode(acl, &mode) == 0) {
 		inode->i_ctime = ext4_current_time(inode);
 		inode->i_mode = mode;
-- 
2.5.0

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