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 94975C0015E for ; Wed, 21 Jun 2023 18:10:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230467AbjFUSKB (ORCPT ); Wed, 21 Jun 2023 14:10:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231309AbjFUSJj (ORCPT ); Wed, 21 Jun 2023 14:09:39 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5890B1992 for ; Wed, 21 Jun 2023 11:09:30 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-666e6541c98so5128624b3a.2 for ; Wed, 21 Jun 2023 11:09:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1687370970; x=1689962970; 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=lpKS56YO6XbOetsyWxaBSPZDOmgSxMxVtPPYv6jOKso=; b=WpfCWUZeinWi6yBfOIp9eK9fHXs7y3W3CJxsQtCSOL+9ZJwB0cQtVvWzl3ZSl5sepC i8YdFlaS/9XV2Wg82MTORgTzlKtBK9L3i4E7/JP/EspwhuDiKhg/9DOf/2Ze7SBCgZUr JH8SptsFhYYmhcpQYU+FifKw1N6djtiAHyt1E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687370970; x=1689962970; 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=lpKS56YO6XbOetsyWxaBSPZDOmgSxMxVtPPYv6jOKso=; b=OgS/GobyoepRWJixoCvhJwhIB6nwVXo1JjyaTnDmWkzyljOFYd4ofN2MA66YFUxnX2 cObw9Ovqeuh1AzqRX5oXRkhHVXbwDFeGphzjdSjtZ0xeBQiv3I8hblvk3XmNIOPoPoD5 9RCDUWVWTqFUs9KsFwltI4fqB2j1zhPX3ZMaJcZ5a0ex0wTgLOWIjv6XjB9QU+WAV+Bx m7aT0N8RxHns5WFLTkC/DFsMIvc0pinyl1uwZ39H3/LXW9usjsByl05XHnfmxpc2/r5k 807QOeE0QqEwflviuRG2zd/cOCa3djfET5PHjQ5KgQ0mSA8fL9xIPRWqyLUk5Whx1zSt FuoQ== X-Gm-Message-State: AC+VfDzLupPz5qrbCQARiSsxO5+WjIPGDjJIliKBpYs5QabFCsk0aI8Q KNcnJ5tnf0oUOYcIhkjhgLl5tw== X-Google-Smtp-Source: ACHHUZ5FjO//3o1cxickEcjMVH4iLi4UrTcCcOnvUfVCxJ9QqbIqUza86v/28jUXHMQakR8a5uMsaQ== X-Received: by 2002:a05:6a20:429f:b0:122:24ed:f77e with SMTP id o31-20020a056a20429f00b0012224edf77emr9558877pzj.33.1687370969818; Wed, 21 Jun 2023 11:09:29 -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 5-20020aa79145000000b0066883917159sm3191586pfi.79.2023.06.21.11.09.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jun 2023 11:09:29 -0700 (PDT) Date: Wed, 21 Jun 2023 11:09:28 -0700 From: Kees Cook To: Azeem Shaikh Cc: "James E.J. Bottomley" , "Martin K. Petersen" , Bodo Stroesser , linux-hardening@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] scsi: Replace strlcpy with strscpy Message-ID: <202306211109.1D5C9E2@keescook> References: <20230621030033.3800351-1-azeemshaikh38@gmail.com> <20230621030033.3800351-2-azeemshaikh38@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230621030033.3800351-2-azeemshaikh38@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 21, 2023 at 03:00:32AM +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