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Tue, 14 Apr 2020 22:01:08 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::e623]) by smtp.gmail.com with ESMTPSA id 10sm6168833qtp.4.2020.04.14.22.01.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2020 22:01:07 -0700 (PDT) Date: Wed, 15 Apr 2020 01:01:06 -0400 From: Johannes Weiner To: Waiman Long Message-ID: <20200415050106.GA154671@cmpxchg.org> References: <20200413211550.8307-1-longman@redhat.com> <20200413211550.8307-2-longman@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200413211550.8307-2-longman@redhat.com> X-Greylist: Sender IP whitelisted, Sender e-mail whitelisted, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [132.227.60.2]); Wed, 15 Apr 2020 21:23:49 +0200 (CEST) X-Greylist: Sender DNS name whitelisted, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [IPv6:2001:660:3302:283c:0:0:0:2]); Wed, 15 Apr 2020 07:01:09 +0200 (CEST) X-Scanned-By: MIMEDefang 2.78 on 132.227.60.2 X-Scanned-By: MIMEDefang 2.78 X-Mailman-Approved-At: Wed, 15 Apr 2020 21:23:46 +0200 Cc: linux-btrfs@vger.kernel.org, Jarkko Sakkinen , virtualization@lists.linux-foundation.org, David Howells , linux-mm@kvack.org, linux-sctp@vger.kernel.org, keyrings@vger.kernel.org, kasan-dev@googlegroups.com, samba-technical@lists.samba.org, linux-stm32@st-md-mailman.stormreply.com, devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, x86@kernel.org, James Morris , Matthew Wilcox , cocci@systeme.lip6.fr, linux-wpan@vger.kernel.org, intel-wired-lan@lists.osuosl.org, David Rientjes , "Serge E. Hallyn" , linux-pm@vger.kernel.org, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, Linus Torvalds , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-security-module@vger.kernel.org, target-devel@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-crypto@vger.kernel.org, netdev@vger.kernel.org, Joe Perches , Andrew Morton , linuxppc-dev@lists.ozlabs.org, wireguard@lists.zx2c4.com, linux-ppp@vger.kernel.org Subject: Re: [Cocci] [PATCH 1/2] mm, treewide: Rename kzfree() to kfree_sensitive() X-BeenThere: cocci@systeme.lip6.fr X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: cocci-bounces@systeme.lip6.fr Errors-To: cocci-bounces@systeme.lip6.fr On Mon, Apr 13, 2020 at 05:15:49PM -0400, Waiman Long wrote: > As said by Linus: > > A symmetric naming is only helpful if it implies symmetries in use. > Otherwise it's actively misleading. As the btrfs example proves - people can be tempted by this false symmetry to pair kzalloc with kzfree, which isn't what we wanted. > In "kzalloc()", the z is meaningful and an important part of what the > caller wants. > > In "kzfree()", the z is actively detrimental, because maybe in the > future we really _might_ want to use that "memfill(0xdeadbeef)" or > something. The "zero" part of the interface isn't even _relevant_. > > The main reason that kzfree() exists is to clear sensitive information > that should not be leaked to other future users of the same memory > objects. > > Rename kzfree() to kfree_sensitive() to follow the example of the > recently added kvfree_sensitive() and make the intention of the API > more explicit. In addition, memzero_explicit() is used to clear the > memory to make sure that it won't get optimized away by the compiler. > > The renaming is done by using the command sequence: > > git grep -w --name-only kzfree |\ > xargs sed -i 's/\bkzfree\b/kfree_sensitive/' > > followed by some editing of the kfree_sensitive() kerneldoc and the > use of memzero_explicit() instead of memset(). > > Suggested-by: Joe Perches > Signed-off-by: Waiman Long Looks good to me. Thanks for fixing this very old mistake. Acked-by: Johannes Weiner _______________________________________________ Cocci mailing list Cocci@systeme.lip6.fr https://systeme.lip6.fr/mailman/listinfo/cocci