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Hallyn" , linux-mm@kvack.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Torvalds Subject: Re: [PATCH] mm: Add kvfree_sensitive() for freeing sensitive data objects In-Reply-To: <6504.1586159053@warthog.procyon.org.uk> Message-ID: References: <20200406023700.1367-1-longman@redhat.com> <6504.1586159053@warthog.procyon.org.uk> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 6 Apr 2020, David Howells wrote: > David Rientjes 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. > Ah lol, yeah. Probably just better to do if (unlikely(ZERO_OR_NULL_PTR(addr))) return; but I agree that mm.h is likely not the right spot.