linux-kernel - [PATCH 3.4 12/91] cgroup: reject cgroup names with ' '

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: <1417077794-9299-12-git-send-email-lizf@kernel.org>
Date:	Thu, 27 Nov 2014 16:41:55 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alban Crequy <alban.crequy@...labora.co.uk>,
	Tejun Heo <tj@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 12/91] cgroup: reject cgroup names with ' '

From: Alban Crequy <alban.crequy@...labora.co.uk>

3.4.105-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 71b1fb5c4473a5b1e601d41b109bdfe001ec82e0 upstream.

/proc/<pid>/cgroup contains one cgroup path on each line. If cgroup names are
allowed to contain "\n", applications cannot parse /proc/<pid>/cgroup safely.

Signed-off-by: Alban Crequy <alban.crequy@...labora.co.uk>
Signed-off-by: Tejun Heo <tj@...nel.org>
[lizf: Backported to 3.4:
 - adjust context
 - s/name/dentry->d_name.name/]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 kernel/cgroup.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7c8f4f7..c776f89 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3838,6 +3838,11 @@ static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
 	struct cgroup *c_parent = dentry->d_parent->d_fsdata;
 
+	/* Do not accept '\n' to prevent making /proc/<pid>/cgroup unparsable.
+	 */
+	if (strchr(dentry->d_name.name, '\n'))
+		return -EINVAL;
+
 	/* the vfs holds inode->i_mutex already */
 	return cgroup_create(c_parent, dentry, mode | S_IFDIR);
 }
-- 
1.9.1

--
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/