linux-kernel - Re: [PATCH v1] netfs: use kfree_sensitive() instend of kfree() in fscache_free

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Date: Mon, 08 Jan 2024 13:55:50 +0000
From: David Howells <dhowells@...hat.com>
To: Minjie Du <duminjie@...o.com>
Cc: dhowells@...hat.com, linux-cachefs@...hat.com,
    linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] netfs: use kfree_sensitive() instend of kfree() in fscache_free_cookie()

Minjie Du <duminjie@...o.com> wrote:

>  linux-cachefs@...hat.com (moderated
>  list:FILESYSTEMS [NETFS LIBRARY]), linux-fsdevel@...r.kernel.org (open
>  list:FILESYSTEMS [NETFS LIBRARY]), linux-kernel@...r.kernel.org (open list)

In future, could you edit the comments out of the email addresses, please?

> key might contain private information, so use kfree_sensitive to free it.
> In fscache_free_cookie() use kfree_sensitive().

There's no real point.  These are written as filenames (possibly base64-ish
encoded) on disk by cachefiles and represent the information given to the
server to indicate the file (in afs, for example, that's cell name, volume
name, vnode number).

David