linux-ext4 - Re: [PATCH 33/34] overlayfs: handle idmapped merged mounts

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Date:   Fri, 30 Oct 2020 11:57:24 +0200
From:   Amir Goldstein <amir73il@...il.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Geoffrey Thomas <geofft@...reload.com>,
        Mrunal Patel <mpatel@...hat.com>,
        Josh Triplett <josh@...htriplett.org>,
        Andy Lutomirski <luto@...nel.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Theodore Tso <tytso@....edu>, Alban Crequy <alban@...volk.io>,
        Tycho Andersen <tycho@...ho.ws>,
        David Howells <dhowells@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jann Horn <jannh@...gle.com>,
        Seth Forshee <seth.forshee@...onical.com>,
        Stéphane Graber <stgraber@...ntu.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Lennart Poettering <lennart@...ttering.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, smbarber@...omium.org,
        Phil Estes <estesp@...il.com>, Serge Hallyn <serge@...lyn.com>,
        Kees Cook <keescook@...omium.org>,
        Todd Kjos <tkjos@...gle.com>, Jonathan Corbet <corbet@....net>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        Linux Audit <linux-audit@...hat.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        selinux@...r.kernel.org
Subject: Re: [PATCH 33/34] overlayfs: handle idmapped merged mounts

> -int ovl_permission(struct inode *inode, int mask)
> +int ovl_permission_mapped(struct user_namespace *user_ns,
> +                         struct inode *inode, int mask)
>  {
>         struct inode *upperinode = ovl_inode_upper(inode);
>         struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
> -       struct user_namespace *user_ns;
> +       struct user_namespace *real_user_ns;
>         const struct cred *old_cred;
>         int err;
>
> @@ -302,15 +313,15 @@ int ovl_permission(struct inode *inode, int mask)
>         }
>
>         if (upperinode)
> -               user_ns = ovl_upper_mnt_user_ns(OVL_FS(inode->i_sb));
> +               real_user_ns = ovl_upper_mnt_user_ns(OVL_FS(inode->i_sb));
>         else
> -               user_ns = OVL_I(inode)->lower_user_ns;
> +               real_user_ns = OVL_I(inode)->lower_user_ns;

These changes look strange in this patch. Better use real_user_ns in previous
patch.

Thanks,
Amir.