From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f170.google.com (mail-pg1-f170.google.com [209.85.215.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 42C893D3BB for ; Fri, 1 Mar 2024 20:42:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709325722; cv=none; b=GqBLfZGqQ9RLn4BrhXYr6ja2p5QFIYkQBhDgE/Zq94O2wu93+H3UYhS7PPPJvrqhPzwTJ4EamRqTBs+MM2ID1CVP9Nmj5Tg8VGyE8trRqdGcwVIrrA7+8jJmjq8rBOv4excTIq7WPV2q4+04dN9VIh0mBtf52jIexykKGlkoO5A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709325722; c=relaxed/simple; bh=b00h7L6AGlfaD5kvd71sZ7vd6gXSPpX60QhiF/qhUzA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=S6YRyxFD3YgUxMNYPyzKjFDO+7ClpaXm0DX8rLnWFdXAAX0S1wKpg0lKJ2pALqGCCrX5fmvlR9aajTJEo9z1SDf/mE4iRZHcpWF5c5+78vFTuLkDSOVZjkaVvm4PLhcgabKEZFjhnozO0jJNQSVxr8H/MWSUHQO1heBk3wGeZiQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=SEUoTPHn; arc=none smtp.client-ip=209.85.215.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="SEUoTPHn" Received: by mail-pg1-f170.google.com with SMTP id 41be03b00d2f7-5d8ddbac4fbso2270924a12.0 for ; Fri, 01 Mar 2024 12:42:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1709325720; x=1709930520; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=l8fnGBiVDyvj0+sJf46kp+vk3quKyy9Lc46ziSRLCxE=; b=SEUoTPHn2JRwBvVhJO/3HAb1PqWgDpVUy2Y6wftKnM9qb36vU1yO0P5JAoLtHIz39g Vhx/PL9u1UfMVRrDa/e3wy2YAZOx6ZQgmWNJEvImR4WQtuNNyL4fde10ppdyFYelSRyZ 8aKheVPSidhC9OZxizwRDS86gn1jvyQYULShA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709325720; x=1709930520; h=in-reply-to:content-transfer-encoding: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=l8fnGBiVDyvj0+sJf46kp+vk3quKyy9Lc46ziSRLCxE=; b=UnClwt/Aj1AF8OQAwrohgm2iwDnocw82ajVkw9w9rQPTIHt7C6AzRYmY0DOQ7pQcm5 KJ9mp5BfIMw/k9/kQGF2D8KyRukKagsH0tBC/oG3ziOnly7H6qB2DASlEF5ZiAlVuPKH 4I5Uqu/r113ah0SEcWXJl6AUtmlZQjLNvVOGX4nuz2Ip4ptX/TNG2VbFPYa8amSK/6Lm s5imJ3hTgDomRPXn4dV56MnM5eQRH1yN+dPlY+fLj17g6OQRXcpjzpHUBXKSnAk5/5N9 7bmMP9SvKMSViiGf9cuVy7d0srJCAGgQZh84tlHIlzcHPsYT/NzASI4veWjm9ab/PVGB fDTA== X-Forwarded-Encrypted: i=1; AJvYcCX4Ze5jiy6SWMHqNf9Q0Btjn+wqVTP7u8wYUfBKXiGNi9i4cDJgVq4Uy5gHlpq0dM2rrvsqbdtXFih8FSaBRD124sZ7jEHk9O95T8hm X-Gm-Message-State: AOJu0YzD5WVpoOdPtQsg/NRMJBWOMl/A/l1W0P9asUeJ4HG5atEU/MLe PKLXLnS8dWKwlaeS80UiwZ6VqDd16acPOugwDqRl13d3p9aZHGPeBHLTOdAtSw== X-Google-Smtp-Source: AGHT+IEi6FI+IEbwGBctosMmFcuCICddCBpYdWwOsgDnXRw+Iqlkx7u/X41Y65hzbIQOLhuXmk2gFg== X-Received: by 2002:a05:6a20:299e:b0:1a0:e4a6:2d86 with SMTP id f30-20020a056a20299e00b001a0e4a62d86mr2273919pzh.59.1709325720658; Fri, 01 Mar 2024 12:42:00 -0800 (PST) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id r6-20020a62e406000000b006e0416c42c3sm3375303pfh.198.2024.03.01.12.41.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Mar 2024 12:42:00 -0800 (PST) Date: Fri, 1 Mar 2024 12:41:59 -0800 From: Kees Cook To: David Lechner Cc: Mark Brown , Michael Hennerich , Nuno =?iso-8859-1?Q?S=E1?= , "Gustavo A. R. Silva" , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: Re: [PATCH 2/3] spi: axi-spi-engine: use __counted_by() attribute Message-ID: <202403011235.C326E3D46@keescook> References: <20240301-mainline-axi-spi-engine-small-cleanups-v1-0-241dfd2a79f7@baylibre.com> <20240301-mainline-axi-spi-engine-small-cleanups-v1-2-241dfd2a79f7@baylibre.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240301-mainline-axi-spi-engine-small-cleanups-v1-2-241dfd2a79f7@baylibre.com> On Fri, Mar 01, 2024 at 02:25:19PM -0600, David Lechner wrote: > This adds the __counted_by() attribute to the flex array at the end of > struct spi_engine_program in the AXI SPI Engine controller driver. > > Suggested-by: Nuno Sá > Signed-off-by: David Lechner > --- > drivers/spi/spi-axi-spi-engine.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c > index d89f75170c9e..e801eed820df 100644 > --- a/drivers/spi/spi-axi-spi-engine.c > +++ b/drivers/spi/spi-axi-spi-engine.c > @@ -75,7 +75,7 @@ > > struct spi_engine_program { > unsigned int length; > - uint16_t instructions[]; > + uint16_t instructions[] __counted_by(length); > }; You'll also need to change places where you deal with changes to "length", as now accesses to "instructions" will be bounds-checked by the compiler. For example, this change: static void spi_engine_program_add_cmd(struct spi_engine_program *p, bool dry, uint16_t cmd) { p->length++; if (!dry) p->instructions[p->length - 1] = cmd; } -- Kees Cook