linux-kernel - [PATCH v10 39/46] ext4: Don't allow unmapped identifiers in richacls

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Message-Id: <1444604337-17651-40-git-send-email-andreas.gruenbacher@gmail.com>
Date:	Mon, 12 Oct 2015 00:58:50 +0200
From:	Andreas Gruenbacher <andreas.gruenbacher@...il.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 v10 39/46] ext4: Don't allow unmapped identifiers in richacls

From: Andreas Gruenbacher <agruenba@...hat.com>

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 b46ac60..2581117 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -62,6 +62,10 @@ __ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
 	int retval;
 
 	if (acl) {
+		/* 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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