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 6CD01C77B73 for ; Tue, 30 May 2023 23:17:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233752AbjE3XRi (ORCPT ); Tue, 30 May 2023 19:17:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233807AbjE3XRd (ORCPT ); Tue, 30 May 2023 19:17:33 -0400 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35F7411B for ; Tue, 30 May 2023 16:17:28 -0700 (PDT) Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-1b01bd7093aso29293075ad.1 for ; Tue, 30 May 2023 16:17:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1685488647; x=1688080647; 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=GHUteLUYvh/51uT822wgzC3UC/lmseb/CzQL8BFKOrc=; b=LSb8+cHv8sZlouoCKJB81L8JFOiBRG3ScU+UmR/rKy5K1ASuQ8WY2wLLUv3ygI7wQv 6O8r5uvdKzrZzuh8OD890tkQ7V2yMRN6neekkRSBVLLmzlOeMr6l6lkdFimxsF0IcoXQ klZKH7zz53Bq/nHFRp57i/ZRuUzmFm8BwMteA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685488647; x=1688080647; 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=GHUteLUYvh/51uT822wgzC3UC/lmseb/CzQL8BFKOrc=; b=V783oOYL2sPlBtmf5jb22TgoTU4K5k9Xl6ELIgUuTY85E01dWgxnjqjIVNIWUNtHqa mDyz9D2B36s/+XiAmz8pWH1S5O+k6rRwgy0HtyiUly1O+eUAwjIdX8Z0wGgrLKZTANPZ X8NmaEgnAilnnY6PeRgVLWKHAhPfnOXZvL5rVV4IovHgZb25NZxSVkRj+YuRQBT43O4o 6TlLM6QD9xTcRmL7gdYmXKB42OKnSfDmVaevaGh1AeptRhyDQhYjPZwge3vJ8p4lsqrj R50a0UkWl0GUhouEGfrwqAQB/nVfZhCXAbURKX1MHJsMyT9PMsLm5fQU/BvDIFPR9oAU 1eDA== X-Gm-Message-State: AC+VfDztH+WGvtv+3ShAHs3jSnTdlkh8rYgbJEd9Z8N5ZlpFMj0TQwk1 fMlRzYVDSEPaDUkdBLGJvv39/A== X-Google-Smtp-Source: ACHHUZ6fNaQeRwTLdgTPTxJeYnGX1s6sOgZQ3jUFobl2MDArHnYkD1mA6XM0wA5m29XTuVrRMEZelQ== X-Received: by 2002:a17:902:e74f:b0:1b0:2658:db00 with SMTP id p15-20020a170902e74f00b001b02658db00mr4762889plf.31.1685488647652; Tue, 30 May 2023 16:17:27 -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 t16-20020a170902e85000b001ac912cac1asm10861519plg.175.2023.05.30.16.17.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 May 2023 16:17:27 -0700 (PDT) Date: Tue, 30 May 2023 16:17:26 -0700 From: Kees Cook To: Azeem Shaikh Cc: Jens Axboe , linux-hardening@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] block: Replace all non-returning strlcpy with strscpy Message-ID: <202305301617.A25BC88@keescook> References: <20230530155608.272266-1-azeemshaikh38@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230530155608.272266-1-azeemshaikh38@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 30, 2023 at 03:56:08PM +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