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

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Message-ID: <20200406143951.GD21484@bombadil.infradead.org>
Date:   Mon, 6 Apr 2020 07:39:51 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        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

On Mon, Apr 06, 2020 at 10:36:07AM -0400, Waiman Long wrote:
> ZERO_OR_NULL_PTR is defined in slab.h. Using it may cause some header
> file dependency problem. To guard against the possibility of 0-length
> allocation request, how about just

Why is all the kvalloc/kvfree crap in mm.h to begin with?  slab.h is
a more sensible place to put it.  I had a patch to do that once, but I
think it went stale before I posted it.