linux-kernel - Re: [PATCH v3] mm: Add kvfree_sensitive() for freeing sensitive data objects

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Message-ID: <694340.1586290917@warthog.procyon.org.uk>
Date:   Tue, 07 Apr 2020 21:21:57 +0100
From:   David Howells <dhowells@...hat.com>
To:     unlisted-recipients:; (no To-header on input)
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>,
        Joe Perches <joe@...ches.com>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3] mm: Add kvfree_sensitive() for freeing sensitive data objects

David Howells <dhowells@...hat.com> wrote:

> >  			if (unlikely(key_data))
> > -				__kvzfree(key_data, key_data_len);
> > +				kvfree_sensitive(key_data, key_data_len);
> 
> I think the if-statement is redundant.

Ah - I see that you explicitly wanted to keep it.  There's a good chance it'll
get janitored at some point.

David