Looks sensible - maybe we should ban all characters not in [a-zA-Z0-9._-] ?
Paul
On Jan 23, 2008 9:20 PM, YAMAMOTO Takashi <yamamoto@valinux.co.jp> wrote:
> hi,
>
> the following patch rejects '\n' in a cgroup name.
> otherwise /proc/$$/cgroup is not parsable.
>
> example:
> imawoto% cat /proc/$$/cgroup
> memory:/
> imawoto% mkdir -p "
> memory:/foo"
> imawoto% echo $$ >| "
> memory:/foo/tasks"
> imawoto% cat /proc/$$/cgroup
> memory:/
> memory:/foo
> imawoto%
>
> YAMAMOTO Takashi
>
>
> Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
> ---
>
> --- linux-2.6.24-rc8-mm1/kernel/cgroup.c.BACKUP 2008-01-23 14:43:29.000000000 +0900
> +++ linux-2.6.24-rc8-mm1/kernel/cgroup.c 2008-01-24 13:56:28.000000000 +0900
> @@ -2216,6 +2216,10 @@ static long cgroup_create(struct cgroup
> struct cgroup_subsys *ss;
> struct super_block *sb = root->sb;
>
> + /* reject a newline. otherwise /proc/$$/cgroup is not parsable. */
> + if (strchr(dentry->d_name.name, '\n'))
> + return -EINVAL;
> +
> cgrp = kzalloc(sizeof(*cgrp), GFP_KERNEL);
> if (!cgrp)
> return -ENOMEM;
>
> --
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