linux-kernel - [PATCH 1/1] fs: xattr: Don't display attributes without read access

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Date:	Sun, 16 Feb 2014 20:31:01 +0800
From:	Fabian Frederick <fabf@...net.be>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, akpm <akpm@...ux-foundation.org>
Subject: [PATCH 1/1] fs: xattr: Don't display attributes without read access

Any user can display extented attribute names without read
access.

eg: attr -l <filename>

This patch checks inode_permission in listxattr common
function before executing vfs_listxattr.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/xattr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/xattr.c b/fs/xattr.c
index 3377dff..d26b280 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -543,6 +543,10 @@ listxattr(struct dentry *d, char __user *list, size_t size)
 	char *klist = NULL;
 	char *vlist = NULL;	/* If non-NULL, we used vmalloc() */
 
+	error = inode_permission(d->d_inode, MAY_READ);
+	if (error)
+		return error;
+
 	if (size) {
 		if (size > XATTR_LIST_MAX)
 			size = XATTR_LIST_MAX;
-- 
1.8.1.4

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