linux-kernel - Re: [PATCH v2] security: selinux: allow changing labels for cgroupfs

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Date:   Tue, 7 Feb 2017 22:29:13 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Antonio Murdaca <amurdaca@...hat.com>
Cc:     selinux@...ho.nsa.gov, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, vgoyal@...hat.com
Subject: Re: [PATCH v2] security: selinux: allow changing labels for cgroupfs

On Thu, Feb 2, 2017 at 10:22 AM, Antonio Murdaca <amurdaca@...hat.com> wrote:
> This patch allows changing labels for cgroup mounts. Previously, running
> chcon on cgroupfs would throw an "Operation not supported". This patch
> specifically whitelist cgroupfs.
>
> The patch could also allow containers to write only to the systemd cgroup
> for instance, while the other cgroups are kept with cgroup_t label.
>
> Signed-off-by: Antonio Murdaca <runcom@...hat.com>
> ---
> Changes in v2:
>   - whitelist cgroup2 fs type
>
>  security/selinux/hooks.c | 2 ++
>  1 file changed, 2 insertions(+)

Merged into selinux/next, thanks.

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 3b955c6..2789f0a 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -480,6 +480,8 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
>                 sbsec->behavior == SECURITY_FS_USE_NATIVE ||
>                 /* Special handling. Genfs but also in-core setxattr handler */
>                 !strcmp(sb->s_type->name, "sysfs") ||
> +               !strcmp(sb->s_type->name, "cgroup") ||
> +               !strcmp(sb->s_type->name, "cgroup2") ||
>                 !strcmp(sb->s_type->name, "pstore") ||
>                 !strcmp(sb->s_type->name, "debugfs") ||
>                 !strcmp(sb->s_type->name, "tracefs") ||
> --
> 2.9.3

-- 
paul moore
www.paul-moore.com