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Merge branch 'for-5.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

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Pull cgroup fix from Tejun Heo:
 "This is a high priority but low risk fix for a cgroup1 bug where
  rename(2) can change a cgroup's name to something which can break
  parsing of /proc/PID/cgroup"

* 'for-5.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup1: don't allow '\n' in renaming
This commit is contained in:
Linus Torvalds 2021-06-10 12:01:22 -07:00
commit f09eacca59
1 changed files with 4 additions and 0 deletions
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4
kernel/cgroup/cgroup-v1.c
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@ -820,6 +820,10 @@ static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent
struct cgroup *cgrp = kn->priv;
int ret;
/* do not accept '\n' to prevent making /proc/<pid>/cgroup unparsable */
if (strchr(new_name_str, '\n'))
return -EINVAL;
if (kernfs_type(kn) != KERNFS_DIR)
return -ENOTDIR;
if (kn->parent != new_parent)