linux-kernel - Re: [PATCH v5 2/6] pid: use checkpoint_restore_ns_capable() for set

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Message-ID: <20200715150811.ly7fhogee7zykaoh@wittgenstein>
Date:   Wed, 15 Jul 2020 17:08:11 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Adrian Reber <areber@...hat.com>
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Pavel Emelyanov <ovzxemul@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andrei Vagin <avagin@...il.com>,
        Nicolas Viennot <Nicolas.Viennot@...sigma.com>,
        Michał Cłapiński <mclapinski@...gle.com>,
        Kamil Yurtsever <kyurtsever@...gle.com>,
        Dirk Petersen <dipeit@...il.com>,
        Christine Flood <chf@...hat.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Radostin Stoyanov <rstoyanov1@...il.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Serge Hallyn <serge@...lyn.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Arnd Bergmann <arnd@...db.de>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, selinux@...r.kernel.org,
        Eric Paris <eparis@...isplace.org>,
        Jann Horn <jannh@...gle.com>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v5 2/6] pid: use checkpoint_restore_ns_capable() for
 set_tid

On Wed, Jul 15, 2020 at 04:49:50PM +0200, Adrian Reber wrote:
> Use the newly introduced capability CAP_CHECKPOINT_RESTORE to allow
> using clone3() with set_tid set.
> 
> Signed-off-by: Adrian Reber <areber@...hat.com>
> Signed-off-by: Nicolas Viennot <Nicolas.Viennot@...sigma.com>
> ---

Looks good!
Acked-by: Christian Brauner <christian.brauner@...ntu.com>

>  kernel/pid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/pid.c b/kernel/pid.c
> index de9d29c41d77..a9cbab0194d9 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -199,7 +199,7 @@ struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid,
>  			if (tid != 1 && !tmp->child_reaper)
>  				goto out_free;
>  			retval = -EPERM;
> -			if (!ns_capable(tmp->user_ns, CAP_SYS_ADMIN))
> +			if (!checkpoint_restore_ns_capable(tmp->user_ns))
>  				goto out_free;
>  			set_tid_size--;
>  		}
> -- 
> 2.26.2
>