From patchwork Tue Oct 24 03:31:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 13433891 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9683623BB for ; Tue, 24 Oct 2023 03:31:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="d482tgTR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D3BDC433C8; Tue, 24 Oct 2023 03:31:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698118306; bh=FyxQRoyABjxA1s7iHpRFuk9i7fK0p0gpD74X0piO/30=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=d482tgTROHc0UMrauf8piBvV2BSYBoHJ0ugOhrKRpW1Of5vRvcg0pzmix8Q/ZBDOc QWyI9Mn6a5reMdqwe9nNeP4idQCzHA5A3d6wj33RpX4NwgaQ3tvsoV4Y6HkK5TsFFQ 2by2MIY/eqUf/sIueq0RapD6WenpkWr3g+qMFQRyzjXthUhYo32KqLXH5wT62XfbqC NJXQMNKBALEq3O24J/q92RKxOxO1olS1Nhb7RhSUhvXf14XJofMOCz+Qn+guhABU2F PsJwMMEjwY0GmRCfTkbiL7hcXR03hAcLxfRAhLK56UcOXtUnFY09xSSr40gAvRjjSW nKKTKhlCHEpLQ== Date: Mon, 23 Oct 2023 21:31:42 -0600 From: "Gustavo A. R. Silva" To: Dinh Nguyen , Michael Turquette , Stephen Boyd Cc: Kees Cook , linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v3 2/2][next] clk: socfpga: agilex: Add bounds-checking coverage for struct stratix10_clock_data Message-ID: <385c516c498e07eb9a521107e16a7efd26e86ea5.1698117815.git.gustavoars@kernel.org> References: Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: In order to gain the bounds-checking coverage that __counted_by provides to flexible-array members at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions), we must make sure that the counter member, in this case `num`, is updated before the first access to the flex-array member, in this case array `hws`. commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") introduced `__counted_by` for `struct clk_hw_onecell_data` together with changes to relocate some of assignments of counter `num` before `hws` is accessed: include/linux/clk-provider.h: 1380 struct clk_hw_onecell_data { 1381 unsigned int num; 1382 struct clk_hw *hws[] __counted_by(num); 1383 }; However, this structure is used as a member in other structs, in this case in `struct sstratix10_clock_data`: drivers/clk/socfpga/stratix10-clk.h: 9 struct stratix10_clock_data { 10 void __iomem *base; 11 12 /* Must be last */ 13 struct clk_hw_onecell_data clk_data; 14 }; Hence, we need to move the assignments to `clk_data->clk_data.num` after allocations for `struct stratix10_clock_data` and before accessing the flexible array `clk_data->clk_data.hws`. And, as assignments for both `clk_data->clk_data.num` and `clk_data->base` are originally adjacent to each other, relocate both assignments together. Reviewed-by: Kees Cook Signed-off-by: Gustavo A. R. Silva --- Changes in v3: - None, really. Just Cc linux-clk@vger.kernel.org this time. Changes in v2: - None. - Link: https://lore.kernel.org/linux-hardening/f531ae35ef434b62f48534c67ad3b1013bff0536.1697493574.git.gustavoars@kernel.org/ v1: - Link: https://lore.kernel.org/linux-hardening/fd4cd8503316d536e1a84fa2ae5bdefdd4b24afe.1697059539.git.gustavoars@kernel.org/ drivers/clk/socfpga/clk-agilex.c | 12 ++++++------ drivers/clk/socfpga/clk-s10.c | 6 +++--- 2 files changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/clk/socfpga/clk-agilex.c b/drivers/clk/socfpga/clk-agilex.c index 6b65a74aefa6..8dd94f64756b 100644 --- a/drivers/clk/socfpga/clk-agilex.c +++ b/drivers/clk/socfpga/clk-agilex.c @@ -471,12 +471,12 @@ static int agilex_clkmgr_init(struct platform_device *pdev) if (!clk_data) return -ENOMEM; + clk_data->clk_data.num = num_clks; + clk_data->base = base; + for (i = 0; i < num_clks; i++) clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT); - clk_data->base = base; - clk_data->clk_data.num = num_clks; - agilex_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data); agilex_clk_register_c_perip(agilex_main_perip_c_clks, @@ -511,12 +511,12 @@ static int n5x_clkmgr_init(struct platform_device *pdev) if (!clk_data) return -ENOMEM; - for (i = 0; i < num_clks; i++) - clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT); - clk_data->base = base; clk_data->clk_data.num = num_clks; + for (i = 0; i < num_clks; i++) + clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT); + n5x_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data); n5x_clk_register_c_perip(n5x_main_perip_c_clks, diff --git a/drivers/clk/socfpga/clk-s10.c b/drivers/clk/socfpga/clk-s10.c index 3752bd9c103c..b4bf4e2d38e1 100644 --- a/drivers/clk/socfpga/clk-s10.c +++ b/drivers/clk/socfpga/clk-s10.c @@ -402,12 +402,12 @@ static int s10_clkmgr_init(struct platform_device *pdev) if (!clk_data) return -ENOMEM; - for (i = 0; i < num_clks; i++) - clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT); - clk_data->base = base; clk_data->clk_data.num = num_clks; + for (i = 0; i < num_clks; i++) + clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT); + s10_clk_register_pll(s10_pll_clks, ARRAY_SIZE(s10_pll_clks), clk_data); s10_clk_register_c_perip(s10_main_perip_c_clks,