/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.cre...@collabora.co.uk>
---
v2: Fixed according to comments from Tejun Heo: only reject '\n'
kernel/cgroup.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7dc8788..c3d1802 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4543,6 +4543,11 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn,
const char *name,
struct cftype *base_files;
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;
--
1.8.5.3
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