linux-kernel - Re: [PATCH] mm: Add kvfree_sensitive() for freeing sensitive data objects

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Message-ID: <334933.1586190389@warthog.procyon.org.uk>
Date:   Mon, 06 Apr 2020 17:26:29 +0100
From:   David Howells <dhowells@...hat.com>
To:     Joe Perches <joe@...ches.com>
Cc:     dhowells@...hat.com, Waiman Long <longman@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, linux-mm@...ck.org,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] mm: Add kvfree_sensitive() for freeing sensitive data objects

Joe Perches <joe@...ches.com> wrote:

> While I agree with Linus about the __ prefix,
> the z is pretty common and symmetric to all
> the <foo>zalloc uses.
> 
> And if _sensitive is actually used, it'd be
> good to do a s/kzfree/kfree_sensitive/ one day
> sooner than later.

How much overhead would it be to always use kvfree_sensitive() and never have
a kfree_sensitive()?

David