From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 968C9C2BA17 for ; Mon, 6 Apr 2020 16:44:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 630BA21D7A for ; Mon, 6 Apr 2020 16:44:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 630BA21D7A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=perches.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D3A988E004B; Mon, 6 Apr 2020 12:44:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CEB0A8E000D; Mon, 6 Apr 2020 12:44:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C00518E004B; Mon, 6 Apr 2020 12:44:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0223.hostedemail.com [216.40.44.223]) by kanga.kvack.org (Postfix) with ESMTP id A5E958E000D for ; Mon, 6 Apr 2020 12:44:53 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 647E4A779 for ; Mon, 6 Apr 2020 16:44:53 +0000 (UTC) X-FDA: 76678004466.25.soda12_47bee1badfa20 X-HE-Tag: soda12_47bee1badfa20 X-Filterd-Recvd-Size: 3115 Received: from smtprelay.hostedemail.com (smtprelay0147.hostedemail.com [216.40.44.147]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Mon, 6 Apr 2020 16:44:52 +0000 (UTC) Received: from filter.hostedemail.com (clb03-v110.bra.tucows.net [216.40.38.60]) by smtprelay03.hostedemail.com (Postfix) with ESMTP id AC18E8378BA1; Mon, 6 Apr 2020 16:44:52 +0000 (UTC) X-Session-Marker: 6A6F6540706572636865732E636F6D X-HE-Tag: bomb61_4778f7b443b57 X-Filterd-Recvd-Size: 1970 Received: from XPS-9350.home (unknown [47.151.136.130]) (Authenticated sender: joe@perches.com) by omf07.hostedemail.com (Postfix) with ESMTPA; Mon, 6 Apr 2020 16:44:51 +0000 (UTC) Message-ID: Subject: Re: [PATCH] mm: Add kvfree_sensitive() for freeing sensitive data objects From: Joe Perches To: Linus Torvalds Cc: David Howells , Waiman Long , Andrew Morton , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , Linux-MM , keyrings@vger.kernel.org, Linux Kernel Mailing List Date: Mon, 06 Apr 2020 09:42:52 -0700 In-Reply-To: References: <20200406023700.1367-1-longman@redhat.com> <319765.1586188840@warthog.procyon.org.uk> Content-Type: text/plain; charset="ISO-8859-1" User-Agent: Evolution 3.34.1-2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit 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, 2020-04-06 at 09:41 -0700, Linus Torvalds wrote: > On Mon, Apr 6, 2020 at 9:12 AM Joe Perches wrote: > > While I agree with Linus about the __ prefix, > > the z is pretty common and symmetric to all > > the zalloc uses. > > Yes, we have a pattern of 'z' for zero. > > But the _operation_ isn't symmetric. > > "kzalloc()" has absolutely _nothing_ to do with "kzfree()". They are > not some kind of "opposite symmetric operation". They are totally > different. They have absolutely nothing in common. Dubious assertion. Both end up with zeroed memory.