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Date:   Fri, 14 Feb 2020 12:03:14 -0700
From:   Tycho Andersen <tycho@tycho.ws>
To:     Christian Brauner <christian.brauner@ubuntu.com>
Cc:     =?iso-8859-1?Q?St=E9phane?= Graber <stgraber@ubuntu.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Aleksa Sarai <cyphar@cyphar.com>, Jann Horn <jannh@google.com>,
        Kees Cook <keescook@chromium.org>,
        Jonathan Corbet <corbet@lwn.net>, linux-kernel@vger.kernel.org,
        containers@lists.linux-foundation.org, smbarber@chromium.org,
        Seth Forshee <seth.forshee@canonical.com>,
        linux-security-module@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: [PATCH v2 19/28] stat: handle fsid mappings
Message-ID: <20200214190314.GD22883@cisco>
References: <20200214183554.1133805-1-christian.brauner@ubuntu.com>
 <20200214183554.1133805-20-christian.brauner@ubuntu.com>
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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