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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 7DB97C433E2 for ; Tue, 16 Jun 2020 19:47:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 520FC208D5 for ; Tue, 16 Jun 2020 19:47:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="auHBa5AE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731407AbgFPTrI (ORCPT ); Tue, 16 Jun 2020 15:47:08 -0400 Received: from mail.zx2c4.com ([192.95.5.64]:59205 "EHLO mail.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730609AbgFPTrE (ORCPT ); Tue, 16 Jun 2020 15:47:04 -0400 Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTP id f0c01c92; Tue, 16 Jun 2020 19:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=zx2c4.com; h=mime-version :references:in-reply-to:from:date:message-id:subject:to:cc :content-type; s=mail; bh=7vGnD2Fc5hFa6zE6l8I/6fYFWTE=; b=auHBa5 AEe5pm5r80dgWM49RbxNg2b1wePIyReSMQ0Rz/3L8Yx5mFtqdklxmmgnU69XYlJN hUBaHFgVJALywQiz6/SIkttoZgX1tGyz+Zg+VQcgVldFachBs52tuPslyyMFQ0LX thiKjEu3HP7G7pjaS6Q85sWuiJrjwSZZouMci0xDSFLn39VuLeRw1x/kWL7uYtnC q9lJ9u4WEJkyqJPlHNMFgYZ8GQhbEM4aqhZNPWgxeSvHzabhX4d1A2W++bIgoNgb 5POprpu6DVgEzddWZ80fiiLd2tnSpz4DTk3KcXvzj6IQwWQeVy1VhdN6Y6LpuXnz 67qrTsLtz03/PXLw== Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id def91afe (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 16 Jun 2020 19:29:00 +0000 (UTC) Received: by mail-io1-f50.google.com with SMTP id s18so3192212ioe.2; Tue, 16 Jun 2020 12:46:59 -0700 (PDT) X-Gm-Message-State: AOAM532ICgqzUljjLdMiLJDrmaM6G2P2VuQ5E+2Wa9rsZgiZCLicoMk2 6gPasqRds+Zf64jDUyn/ObteEMB32F2gp413H0M= X-Google-Smtp-Source: ABdhPJxC2pRunaModJX8LCWHauaz4Ko5hXWZ58PHme1+4UYNCmQGIC+iarFUNAqn+rNJyw3DywT6LsxlwSFMRJ3z3pU= X-Received: by 2002:a6b:6705:: with SMTP id b5mr4346341ioc.29.1592336817452; Tue, 16 Jun 2020 12:46:57 -0700 (PDT) MIME-Version: 1.0 References: <20200616015718.7812-1-longman@redhat.com> In-Reply-To: From: "Jason A. Donenfeld" Date: Tue, 16 Jun 2020 13:46:46 -0600 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() To: Joe Perches Cc: Waiman Long , Andrew Morton , David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , Linus Torvalds , Matthew Wilcox , David Rientjes , Michal Hocko , Johannes Weiner , Dan Carpenter , David Sterba , Linux-MM , keyrings@vger.kernel.org, LKML , Linux Crypto Mailing List , linux-pm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux-foundation.org, Netdev , linux-ppp@vger.kernel.org, WireGuard mailing list , linux-wireless , devel@driverdev.osuosl.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-fscrypt@vger.kernel.org, ecryptfs@vger.kernel.org, kasan-dev@googlegroups.com, linux-bluetooth@vger.kernel.org, linux-wpan@vger.kernel.org, linux-sctp@vger.kernel.org, linux-nfs@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-security-module , linux-integrity@vger.kernel.org, David Miller , Steffen Klassert Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 16, 2020 at 12:54 PM Joe Perches wrote: > > On Mon, 2020-06-15 at 21:57 -0400, Waiman Long wrote: > > v4: > > - Break out the memzero_explicit() change as suggested by Dan Carpenter > > so that it can be backported to stable. > > - Drop the "crypto: Remove unnecessary memzero_explicit()" patch for > > now as there can be a bit more discussion on what is best. It will be > > introduced as a separate patch later on after this one is merged. > > To this larger audience and last week without reply: > https://lore.kernel.org/lkml/573b3fbd5927c643920e1364230c296b23e7584d.camel@perches.com/ > > Are there _any_ fastpath uses of kfree or vfree? The networking stack has various places where there will be a quick kmalloc followed by a kfree for an incoming or outgoing packet. One place that comes to mind would be esp_alloc_tmp, which does a quick allocation of some temporary kmalloc memory, processes some packet things inside of that, and then frees it, sometimes in the same function, and sometimes later in an async callback. I don't know how "fastpath" you consider this, but usually packet processing is something people want to do with minimal overhead, considering how fast NICs are these days.