linux-kernel - [PATCH 4.4 059/230] sockfs: getxattr: Fail with -EOPNOTSUPP for invalid attribute names

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Date:   Fri, 22 Mar 2019 12:13:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andreas Gruenbacher <agruenba@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.4 059/230] sockfs: getxattr: Fail with -EOPNOTSUPP for invalid attribute names

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 971df15bd54ad46e907046ff33750a137b2f0096 upstream.

The standard return value for unsupported attribute names is
-EOPNOTSUPP, as opposed to undefined but supported attributes
(-ENODATA).

Also, fail for attribute names like "system.sockprotonameXXX" and
simplify the code a bit.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
[removes a build warning on 4.4.y - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/socket.c |   24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

--- a/net/socket.c
+++ b/net/socket.c
@@ -470,27 +470,15 @@ static struct socket *sockfd_lookup_ligh
 static ssize_t sockfs_getxattr(struct dentry *dentry,
 			       const char *name, void *value, size_t size)
 {
-	const char *proto_name;
-	size_t proto_size;
-	int error;
-
-	error = -ENODATA;
-	if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
-		proto_name = dentry->d_name.name;
-		proto_size = strlen(proto_name);
-
+	if (!strcmp(name, XATTR_NAME_SOCKPROTONAME)) {
 		if (value) {
-			error = -ERANGE;
-			if (proto_size + 1 > size)
-				goto out;
-
-			strncpy(value, proto_name, proto_size + 1);
+			if (dentry->d_name.len + 1 > size)
+				return -ERANGE;
+			memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
 		}
-		error = proto_size + 1;
+		return dentry->d_name.len + 1;
 	}
-
-out:
-	return error;
+	return -EOPNOTSUPP;
 }
 
 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,