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 04B6BC4708D for ; Tue, 27 Dec 2022 20:39:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232604AbiL0UjH (ORCPT ); Tue, 27 Dec 2022 15:39:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232674AbiL0Uhp (ORCPT ); Tue, 27 Dec 2022 15:37:45 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B1B8E00A; Tue, 27 Dec 2022 12:34:22 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id ADDE0B811FB; Tue, 27 Dec 2022 20:34:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0EFFC433F1; Tue, 27 Dec 2022 20:34:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672173260; bh=ox2BEnfMPBNYHHyGMIa+nrsHjfNFzw5LZfghfX3ovzY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iS3gr8U4yU0nJuwimMLUwYxyX179WdPRfWSfBScwDXtdisc80plDwPw2f4HHqqQJR wIeTo0y6lG1s/Gzxg+EL8PBRlYGWrz1W5f8gYWJxAu7rZnxyEtTSsXeLjg2iptxV2j IOFr1CZ1bmHjSGJusOOyFwhg6VKBz6rg/pnAVl5vS6Q8e5LPumvk6lj2nHnupJxJVO 7jmxEX9BHbvOHnNbLXI18L3kUzdTveZoxoNjVLwAfuuoVLuh6Pt7+h8g53mrswiPGP d3wKZHhSdbmsyaJH98CjDqYl2E+XIge+ZpOHE6jU/ENG2Ft/ZFYHuAv1iMP5xOux6l IHI77OCnOx8Mw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kees Cook , kernel test robot , Christophe JAILLET , Daniel Palmer , Romain Perier , Alessandro Zummo , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org, Sasha Levin , nathan@kernel.org, ndesaulniers@google.com, llvm@lists.linux.dev Subject: [PATCH AUTOSEL 6.0 23/27] rtc: msc313: Fix function prototype mismatch in msc313_rtc_probe() Date: Tue, 27 Dec 2022 15:33:38 -0500 Message-Id: <20221227203342.1213918-23-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221227203342.1213918-1-sashal@kernel.org> References: <20221227203342.1213918-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kees Cook [ Upstream commit 21b8a1dd56a163825e5749b303858fb902ebf198 ] With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. msc313_rtc_probe() was passing clk_disable_unprepare() directly, which did not have matching prototypes for devm_add_action_or_reset()'s callback argument. Refactor to use devm_clk_get_enabled() instead. This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches. Reported-by: kernel test robot Link: https://lore.kernel.org/lkml/202211041527.HD8TLSE1-lkp@intel.com Suggested-by: Christophe JAILLET Cc: Daniel Palmer Cc: Romain Perier Cc: Alessandro Zummo Cc: Alexandre Belloni Cc: linux-arm-kernel@lists.infradead.org Cc: linux-rtc@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Daniel Palmer Tested-by: Daniel Palmer Link: https://lore.kernel.org/r/20221202184525.gonna.423-kees@kernel.org Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/rtc-msc313.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/drivers/rtc/rtc-msc313.c b/drivers/rtc/rtc-msc313.c index f3fde013c4b8..8d7737e0e2e0 100644 --- a/drivers/rtc/rtc-msc313.c +++ b/drivers/rtc/rtc-msc313.c @@ -212,22 +212,12 @@ static int msc313_rtc_probe(struct platform_device *pdev) return ret; } - clk = devm_clk_get(dev, NULL); + clk = devm_clk_get_enabled(dev, NULL); if (IS_ERR(clk)) { dev_err(dev, "No input reference clock\n"); return PTR_ERR(clk); } - ret = clk_prepare_enable(clk); - if (ret) { - dev_err(dev, "Failed to enable the reference clock, %d\n", ret); - return ret; - } - - ret = devm_add_action_or_reset(dev, (void (*) (void *))clk_disable_unprepare, clk); - if (ret) - return ret; - rate = clk_get_rate(clk); writew(rate & 0xFFFF, priv->rtc_base + REG_RTC_FREQ_CW_L); writew((rate >> 16) & 0xFFFF, priv->rtc_base + REG_RTC_FREQ_CW_H); -- 2.35.1