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Date: Fri, 3 Oct 2014 14:29:52 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Alban Crequy <alban.crequy@...labora.co.uk>, Tejun Heo <tj@...nel.org> Subject: [PATCH 3.16 206/357] cgroup: reject cgroup names with \n 3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alban Crequy <alban.crequy@...labora.co.uk> 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> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- kernel/cgroup.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4393,6 +4393,11 @@ static int cgroup_mkdir(struct kernfs_no struct kernfs_node *kn; int ssid, ret; + /* Do not accept '\n' to prevent making /proc/<pid>/cgroup unparsable. + */ + if (strchr(name, '\n')) + return -EINVAL; + parent = cgroup_kn_lock_live(parent_kn); if (!parent) return -ENODEV; -- 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/
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