linux-kernel - [RFC v6 34/40] ext4: Don't allow unmapped identifiers in richacls

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Date:	Tue,  4 Aug 2015 13:53:32 +0200
From:	Andreas Gruenbacher <andreas.gruenbacher@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-api@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andreas Gruenbacher <agruenba@...hat.com>
Subject: [RFC v6 34/40] 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 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
index 4385f6d..9d80299 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -68,8 +68,13 @@ ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
 	int retval;
 
 	if (acl) {
-		mode_t mode = inode->i_mode;
+		mode_t mode;
 
+		/* Don't allow acls with unmapped identifiers. */
+		if (richacl_has_unmapped_identifiers(acl))
+			return -EINVAL;
+
+		mode = inode->i_mode;
 		if (richacl_equiv_mode(acl, &mode) == 0) {
 			inode->i_mode = mode;
 			ext4_mark_inode_dirty(handle, inode);
-- 
2.5.0

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