linux-kernel - Re: [PATCH] fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

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Date:   Fri, 08 Dec 2023 06:10:18 +0900
From:   "J. R. Okajima" <hooanon05g@...il.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     amir73il@...il.com, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        miklos@...redi.hu, Stefan Berger <stefanb@...ux.ibm.com>,
        syzbot+a67fc5321ffb4b311c98@...kaller.appspotmail.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Tyler Hicks <code@...icks.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH] fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

Stefan Berger:
> When vfs_getattr_nosec() calls a filesystem's getattr interface function
> then the 'nosec' should propagate into this function so that
> vfs_getattr_nosec() can again be called from the filesystem's gettattr
> rather than vfs_getattr(). The latter would add unnecessary security
> checks that the initial vfs_getattr_nosec() call wanted to avoid.
> Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass
> with the new getattr_flags parameter to the getattr interface function.
> In overlayfs and ecryptfs use this flag to determine which one of the
> two functions to call.

You are introducing two perfectly identical functions.
ecryptfs_do_getattr() and ovl_do_getattr().
Why don't you provide one in a common place, such like
include/linux/fs_stack.h?


J. R. Okajima