linux-kernel - Re: [PATCH 04/13] staging: gasket: core: allow root access based on user namespace

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Message-ID: <CAE_wzQ_vRx6BbidM==ryBh0+4t+FHJg4-55XDHJjm1=2VfMDMg@mail.gmail.com>
Date:   Mon, 30 Jul 2018 10:56:46 -0700
From:   Dmitry Torokhov <dtor@...omium.org>
To:     toddpoynor@...il.com
Cc:     rspringer@...gle.com, jnjoseph@...gle.com, benchan@...omium.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, lkml <linux-kernel@...r.kernel.org>,
        toddpoynor@...gle.com
Subject: Re: [PATCH 04/13] staging: gasket: core: allow root access based on
 user namespace

Hi Todd,

On Sun, Jul 29, 2018 at 12:37 PM Todd Poynor <toddpoynor@...il.com> wrote:
> @@ -1064,7 +1067,8 @@ static int gasket_open(struct inode *inode, struct file *filp)
>         char task_name[TASK_COMM_LEN];
>         struct gasket_cdev_info *dev_info =
>             container_of(inode->i_cdev, struct gasket_cdev_info, cdev);
> -       int is_root = capable(CAP_SYS_ADMIN);
> +       struct pid_namespace *pid_ns = task_active_pid_ns(current);
> +       int is_root = ns_capable(pid_ns->user_ns, CAP_SYS_ADMIN);

ns_capable() returns bool, why did you make is_root an integer?

Thanks,
Dmitry