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

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Message-ID: <6504.1586159053@warthog.procyon.org.uk>
Date:   Mon, 06 Apr 2020 08:44:13 +0100
From:   David Howells <dhowells@...hat.com>
To:     David Rientjes <rientjes@...gle.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

David Rientjes <rientjes@...gle.com> wrote:

> > +static inline void kvfree_sensitive(const void *addr, size_t len)
> > +{
> > +	if (addr) {
> 
> Shouldn't this be if (unlikely(ZERO_OR_NULL_PTR(addr))?

You've reversed the logic - it needs a '!' there.

David