linux-kernel - [PATCHv2] devpts: fix to set default values of mount options

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A0CFCD0.70605@cn.fujitsu.com>
Date:	Fri, 15 May 2009 13:25:36 +0800
From:	Wei Yongjun <yjwei@...fujitsu.com>
To:	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCHv2] devpts: fix to set default values of mount options

If devpts is mounted with no option specified, the default
values of mount options will no be set. This happend in my
Fedora11Beta box.

  $ mkdir /dev/pts2

  $ mount -t devpts devpts /dev/pts2
  $ cat /proc/mounts
  devpts /dev/pts2 devpts rw,relatime,mode=000,ptmxmode=000 0 0

  # umount /dev/pts2
  $ mount -t devpts -o gid=0 devpts /dev/pts2
  $ cat /proc/mounts
  devpts /dev/pts2 devpts rw,relatime,gid=0,mode=600,ptmxmode=000 0 0

This patch fixed this problem.

Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
---
 fs/devpts/inode.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 21165cf..13392b5 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -105,6 +105,9 @@ static int parse_mount_options(char *data, int op, struct pts_mount_opts *opts)
 	if (op == PARSE_MOUNT)
 		opts->newinstance = 0;
 
+	if (!data)
+		return 0;
+
 	while ((p = strsep(&data, ",")) != NULL) {
 		substring_t args[MAX_OPT_ARGS];
 		int token;
@@ -356,11 +359,10 @@ static int devpts_get_sb(struct file_system_type *fs_type,
 	struct super_block *s;
 
 	memset(&opts, 0, sizeof(opts));
-	if (data) {
-		error = parse_mount_options(data, PARSE_MOUNT, &opts);
-		if (error)
-			return error;
-	}
+
+	error = parse_mount_options(data, PARSE_MOUNT, &opts);
+	if (error)
+		return error;
 
 	if (opts.newinstance)
 		s = sget(fs_type, NULL, set_anon_super, NULL);
-- 
1.5.3.8



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/