linux-kernel - [PATCH] vfs: Check attribute names in posix acl xattr handers

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Message-Id: <1444318403-21985-1-git-send-email-agruenba@redhat.com>
Date:	Thu,  8 Oct 2015 17:33:23 +0200
From:	Andreas Gruenbacher <agruenba@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH] vfs: Check attribute names in posix acl xattr handers

The get and set operations of the posix acl xattr handlers failed to check
the attribute names, so all names with "system.posix_acl_access" or
"system.posix_acl_default" as a prefix were accepted.  Reject invalid names
from now on.

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

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 4fb17de..b1a66e8 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -768,6 +768,8 @@ posix_acl_xattr_get(struct dentry *dentry, const char *name,
 	struct posix_acl *acl;
 	int error;
 
+	if (strcmp(name, "") != 0)
+		return -EINVAL;
 	if (!IS_POSIXACL(d_backing_inode(dentry)))
 		return -EOPNOTSUPP;
 	if (d_is_symlink(dentry))
@@ -793,6 +795,8 @@ posix_acl_xattr_set(struct dentry *dentry, const char *name,
 	struct posix_acl *acl = NULL;
 	int ret;
 
+	if (strcmp(name, "") != 0)
+		return -EINVAL;
 	if (!IS_POSIXACL(inode))
 		return -EOPNOTSUPP;
 	if (!inode->i_op->set_acl)
-- 
2.5.0

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