linux-kernel - Re: [PATCH v2 19/28] stat: handle fsid mappings

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Message-ID: <20200214190314.GD22883@cisco>
Date:   Fri, 14 Feb 2020 12:03:14 -0700
From:   Tycho Andersen <tycho@...ho.ws>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Stéphane Graber <stgraber@...ntu.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Aleksa Sarai <cyphar@...har.com>, Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org, smbarber@...omium.org,
        Seth Forshee <seth.forshee@...onical.com>,
        linux-security-module@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH v2 19/28] stat: handle fsid mappings

On Fri, Feb 14, 2020 at 07:35:45PM +0100, Christian Brauner wrote:
> @@ -471,8 +484,13 @@ static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
>  #endif
>  	tmp.st_mode = stat->mode;
>  	tmp.st_nlink = stat->nlink;
> -	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
> -	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
> +	if (stat->userns_visible) {
> +		tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid);
> +		tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid);
> +	} else {
> +		tmp.st_uid, from_kfsuid_munged(current_user_ns(), stat->uid);
> +		tmp.st_gid, from_kfsgid_munged(current_user_ns(), stat->gid);
> +	}

I suppose this should be = ?

Tycho