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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4E6AC4708E for ; Thu, 5 Jan 2023 23:37:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 280268E0002; Thu, 5 Jan 2023 18:37:08 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 209308E0001; Thu, 5 Jan 2023 18:37:08 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 083B98E0002; Thu, 5 Jan 2023 18:37:08 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id E95028E0001 for ; Thu, 5 Jan 2023 18:37:07 -0500 (EST) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id B9B7614080D for ; Thu, 5 Jan 2023 23:37:07 +0000 (UTC) X-FDA: 80322358494.18.3AE4DAB Received: from mail-pg1-f178.google.com (mail-pg1-f178.google.com [209.85.215.178]) by imf09.hostedemail.com (Postfix) with ESMTP id 194CE140003 for ; Thu, 5 Jan 2023 23:37:05 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=LMqQtvzt; spf=pass (imf09.hostedemail.com: domain of keescook@chromium.org designates 209.85.215.178 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1672961826; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=fHKQ83TkKEHZNfWaTpd7I1p+Ye/n4ELFtjaRUnS2gPw=; b=g+zzk+ZBNEES9yp9xw1BViYPPX3nXLDuVrIZin+Mrgi9WGfTUDf+fUj1DnzTEPJGQO89iH DZcQazOeMMgltAB5lkVcy85wDp8wUUVDmNd3StnSg0csYUVswqhxqQjeapAHq1Cc8g9ZIu lYrAiE5P2UoH1oCzUuGyIbo4vEzrMc4= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=LMqQtvzt; spf=pass (imf09.hostedemail.com: domain of keescook@chromium.org designates 209.85.215.178 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1672961826; a=rsa-sha256; cv=none; b=CtnfRdvZQ58ee4NJrVlOjU20s1bytFKyQE6myAc0XfUmSDfLEBKHknO92Hwa4rEx+YFyxy q/avDriFUe0PqJlOpv/LMwkmN9ezDavudRZ9SxR4X/jZq8aec7pwcZQ/0q7LW6yKb7T32N Lvf6Lbxpu6U0Eglu/8Z4t87VPvXNV84= Received: by mail-pg1-f178.google.com with SMTP id 79so112637pgf.11 for ; Thu, 05 Jan 2023 15:37:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=fHKQ83TkKEHZNfWaTpd7I1p+Ye/n4ELFtjaRUnS2gPw=; b=LMqQtvzt2+QM2CkjErp2jFM2yQtbcYxDV0K/LKxTe1P8YmSGP2p7jeTlg3XOo2UHM0 1fDkl9f80UNImV2GTHXK1XNYOEXj2ghw/LpXe2GNEp0PPfCpbtR02fZ81Ey9jhZKmQFg KkMSbXyc18ptcvRcVAXuifGbERGMhlxK+dMWQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=fHKQ83TkKEHZNfWaTpd7I1p+Ye/n4ELFtjaRUnS2gPw=; b=wN+ni40gaOScDOmzg9e1KVHHf58HqOM3+UF1y7Y60rKXI5WPt90I2pBR0sgIdCOnPa iub/wJm7nGhvC+vkQKT3RjrqJ8BbyqlCLPDcdFLnykrsnccwZnfAjJ62ntKMSLolt597 FeKlHBtoAuQAlTiUTt+c+RQi/hNCT52rDIKaxtFDMZBHa6+FWFwCW1EAFhqMc8FSkKAP UxxW69WwrBJCDptgHyPVxA8pTv616AYk2AA0JdgI1DAdu5H9yIeJ2ORC4irwYC0mAc98 jSddeuCoo7AC6771P11+Os12MMt9M/eakYpa3Q5PZWepDbvjfJSRSG/MOdOyvOHtAF8d NRkA== X-Gm-Message-State: AFqh2kqFBz/W2oEMXOHwR3NDL9AxT1S+pVYhdz+uIKOdpzg8K0oymdaZ H/aJuaHm7Y/zV7HeGQhdst7jLA== X-Google-Smtp-Source: AMrXdXufvlt5jsZ0Z77jyujuetbqgVHWtWYhgi+Ryfjs9AMwVglyDb0750tKRIXFRVwglbTba5/8Gw== X-Received: by 2002:aa7:8812:0:b0:582:c142:d4b8 with SMTP id c18-20020aa78812000000b00582c142d4b8mr11001418pfo.0.1672961824824; Thu, 05 Jan 2023 15:37:04 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id z126-20020a623384000000b00576ee69c130sm24850952pfz.4.2023.01.05.15.37.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jan 2023 15:37:04 -0800 (PST) Date: Thu, 5 Jan 2023 15:37:03 -0800 From: Kees Cook To: "Gustavo A. R. Silva" Cc: "Gustavo A. R. Silva" , Andrew Morton , Dan Williams , Alex Sierra , Felix Kuehling , "Matthew Wilcox (Oracle)" , Shiyang Ruan , linux-mm@kvack.org, Alistair Popple , Joao Martins , Mike Rapoport , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: Re: [PATCH] memremap: Replace 0-length array with flexible array Message-ID: <202301051536.1D1F92678@keescook> References: <20230105220151.never.343-kees@kernel.org> <202301051441.C1D7291921@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 194CE140003 X-Rspam-User: X-Stat-Signature: fdpkj1tcimyi4h7bx8pj73r4rptihw4s X-HE-Tag: 1672961825-616052 X-HE-Meta: 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 813P8yXS xTh06IW13opu50In5qb2GKWjhbqZDRIM0go0DoEnbzspIcPz6Y2/vWfv8DPIgEx4jaITnqEeUmDuhXcNUo2HjsrfSYvtoSD0VbcWA 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 Thu, Jan 05, 2023 at 05:14:23PM -0600, Gustavo A. R. Silva wrote: > > > On 1/5/23 16:41, Kees Cook wrote: > > On Thu, Jan 05, 2023 at 04:14:05PM -0600, Gustavo A. R. Silva wrote: > > > I think this is the same patch: > > > > > > https://lore.kernel.org/linux-hardening/YxKO%2FjY1x0xTpl4r@work/ > > > > > > It's actually in linux-next. > > > > Hm, it's been in -next since September? Is this in a tree of yours that > > didn't get pulled for v6.2? > > No. I didn't send it. It's just one of the two patches I have in my -next > tree. They didn't look like high priority at the time. Cool. I'd like to get -fstrict-flex-arrays=3 finished this devel cycle, if possible. Can you add this one too? https://lore.kernel.org/lkml/YzIc8z+QaHvqPjLX@work I don't see it in patchwork which I find confusing too. :P -- Kees Cook