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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4DA13C7EE24 for ; Tue, 16 May 2023 18:14:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229718AbjEPSOo (ORCPT ); Tue, 16 May 2023 14:14:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229566AbjEPSOn (ORCPT ); Tue, 16 May 2023 14:14:43 -0400 Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 158AA524D for ; Tue, 16 May 2023 11:14:42 -0700 (PDT) Received: by mail-pg1-x534.google.com with SMTP id 41be03b00d2f7-5208be24dcbso10439231a12.1 for ; Tue, 16 May 2023 11:14:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1684260881; x=1686852881; 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=Cg1IpCs76qt4BHLeBZQq6IvnVtorgmXMxk619Xj1Uqc=; b=CMyOZsQ5t1dGqI2Pvqq/Mv7hXz5FG9937GXk2VxgppKxIxFB6lm7hMXHKMFtXFwgUb Lp1HdPu0crbRz19dUSCQH5j+8l6CuSOvYI2FASFHa+Wfhi0T4EuYt+qWV6JMviGmbCqs FDYBXKuYvXuw838C5SRWPmWiYVRppKIxc1Wds= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684260881; x=1686852881; 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=Cg1IpCs76qt4BHLeBZQq6IvnVtorgmXMxk619Xj1Uqc=; b=QcU/RTOWTVNYKX4jzrfDSjWuQGA6Ad0dCK/LcMUvORdEki4ItC3oPvxXf/WExy3+Hg 5+kT/A2OC/cLktPsoQNRdb5seV2KeJwKgePZJ71Jct1XFQbs7AiLfW6rup2K0olxt5sZ QjTGCabA0nXpvgVJxCK4FMSOdWzNcQYvP3l+lK1Yr6hWGlfr1IYlRhoVSbG+lzP1zo/9 7cv3GBVy4q+Kxiaxd7uXEwCiE7givwIBbcpi9c9kwnussjh2t/7zPxNSe0RNeE0yU/T7 2uMYXLRE2aAke2U5TlTmcBhXeZ9OgIM/9ylJeaXGwGCSITV9mS7qkXUanAePFM3tIzze OGiQ== X-Gm-Message-State: AC+VfDwy9kdYNWd8sLE4yC0kYzzfHSmmlcfuTh+3Yj08kmj5LJXECfKY qpPZSVFvoFgMF5CFxUXAwq48Iw== X-Google-Smtp-Source: ACHHUZ4izGBD0HFWArYDhM5jgc2TRXuMaB66vHnHRoCb2UTTbkZwSSft+Nt+R/BbgsAwYbSErBoDOA== X-Received: by 2002:a05:6a20:729e:b0:100:bae5:acf3 with SMTP id o30-20020a056a20729e00b00100bae5acf3mr38344461pzk.37.1684260881349; Tue, 16 May 2023 11:14:41 -0700 (PDT) Received: from www.outflux.net (198-0-35-241-static.hfc.comcastbusiness.net. [198.0.35.241]) by smtp.gmail.com with ESMTPSA id 17-20020aa79251000000b006468222af91sm13764701pfp.48.2023.05.16.11.14.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 May 2023 11:14:39 -0700 (PDT) Date: Tue, 16 May 2023 11:14:38 -0700 From: Kees Cook To: Azeem Shaikh Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , linux-hardening@vger.kernel.org, Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Adrian Hunter , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Kan Liang , Yang Jihong , Liam Howlett , Miguel Ojeda , Andrii Nakryiko , Leo Yan , James Clark , Suzuki Poulouse , Sean Christopherson , Paolo Bonzini Subject: Re: [PATCH] perf pmu: Replace all non-returning strlcpy with strscpy Message-ID: <202305161114.DEC49FB91@keescook> References: <20230516000500.3884588-1-azeemshaikh38@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230516000500.3884588-1-azeemshaikh38@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 16, 2023 at 12:05:00AM +0000, Azeem Shaikh wrote: > strlcpy() reads the entire source buffer first. > This read may exceed the destination size limit. > This is both inefficient and can lead to linear read > overflows if a source string is not NUL-terminated [1]. > In an effort to remove strlcpy() completely [2], replace > strlcpy() here with strscpy(). > No return values were used, so direct replacement is safe. > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy > [2] https://github.com/KSPP/linux/issues/89 > > Signed-off-by: Azeem Shaikh Reviewed-by: Kees Cook -- Kees Cook