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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b15-20020a63340f000000b00527d158ec6dsi21401261pga.406.2023.05.17.08.27.51; Wed, 17 May 2023 08:28:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=nYRCTEvO; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231618AbjEQPFS (ORCPT + 99 others); Wed, 17 May 2023 11:05:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231152AbjEQPEj (ORCPT ); Wed, 17 May 2023 11:04:39 -0400 Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC9887EE7 for ; Wed, 17 May 2023 08:04:20 -0700 (PDT) Received: by mail-wr1-x42b.google.com with SMTP id ffacd0b85a97d-30644c18072so607480f8f.2 for ; Wed, 17 May 2023 08:04:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1684335831; x=1686927831; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=oipxQEZj91stE4t+lxud7GTslgXbD/udBSL61+uH1L8=; b=nYRCTEvOWhb0FzekCMnJ6+34uErlW9tdW8D7eUgNnDXRCvoUVAdioTe4bDYStyLbtZ +wOkz4pBqp/FKbfovlnRGHcbww4zHsdW1pobdsCTi7FymG/8pUeZAv4ix9bN6fTKR5K0 yeoouszxWZdws1CxpHmjxNcnk9WQ5iIHC5Qms= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684335831; x=1686927831; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=oipxQEZj91stE4t+lxud7GTslgXbD/udBSL61+uH1L8=; b=Gx9noDoJncCDjnI2jPkT310rwAwaX0iUYQdKvP+lHzIZnptNn+lmq3G5TGdML5znoK kLkUFsGFnkCRGBB4ps6yIHXbW7573AjqVEvvv+pZqD3KVouWQ2Wp9AH8Rz1stTwurEjO SmPXagSA1YxDFXf7xBVxvbrBfBEKoPE2mkWuW+Okp8VxaEgF45x94d3q4RkACBMyYpHY L8ml1DzKEC45N85mjQJCQeaPP9dv0Qgj1njqh77Llv2PwDMwLCD17CzvQ/qVUvEnXBpn wk7/WHTXG96SIqlAu97x2Xp4Sjpyn6xRHZSn9EXAi2ft0nv6rPVgTJyJDNT0KGznHyb4 3pIg== X-Gm-Message-State: AC+VfDwyqt5I4Ni9s6X4GBSbBfMrAtywlz20xmfBKfhChLj7XT0izKZR DZzYxsPdKyzUI5eZ54mIy9VMePHe8nVHcD3tIH0= X-Received: by 2002:a5d:4cc9:0:b0:2fb:7099:6070 with SMTP id c9-20020a5d4cc9000000b002fb70996070mr866319wrt.47.1684335831152; Wed, 17 May 2023 08:03:51 -0700 (PDT) Received: from revest.zrh.corp.google.com ([2a00:79e0:9d:6:e223:a0c2:d2c:c371]) by smtp.gmail.com with ESMTPSA id e17-20020adffd11000000b003047ea78b42sm3038211wrr.43.2023.05.17.08.03.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 May 2023 08:03:50 -0700 (PDT) From: Florent Revest To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: akpm@linux-foundation.org, catalin.marinas@arm.com, anshuman.khandual@arm.com, joey.gouly@arm.com, mhocko@suse.com, keescook@chromium.org, david@redhat.com, peterx@redhat.com, izbyshev@ispras.ru, broonie@kernel.org, szabolcs.nagy@arm.com, kpsingh@kernel.org, gthelen@google.com, toiwoton@gmail.com, Florent Revest Subject: [PATCH v2 3/5] mm: Make PR_MDWE_REFUSE_EXEC_GAIN an unsigned long Date: Wed, 17 May 2023 17:03:19 +0200 Message-ID: <20230517150321.2890206-4-revest@chromium.org> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog In-Reply-To: <20230517150321.2890206-1-revest@chromium.org> References: <20230517150321.2890206-1-revest@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Alexey pointed out that defining a prctl flag as an int is a footgun because, under some circumstances, when used as a flag to prctl, it can be casted to long with garbage upper bits which would result in unexpected behaviors. This patch changes the constant to a UL to eliminate these possibilities. Signed-off-by: Florent Revest Suggested-by: Alexey Izbyshev --- include/uapi/linux/prctl.h | 2 +- tools/include/uapi/linux/prctl.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index f23d9a16507f..6e9af6cbc950 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -283,7 +283,7 @@ struct prctl_mm_map { /* Memory deny write / execute */ #define PR_SET_MDWE 65 -# define PR_MDWE_REFUSE_EXEC_GAIN 1 +# define PR_MDWE_REFUSE_EXEC_GAIN (1UL << 0) #define PR_GET_MDWE 66 diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/prctl.h index 759b3f53e53f..6e6563e97fef 100644 --- a/tools/include/uapi/linux/prctl.h +++ b/tools/include/uapi/linux/prctl.h @@ -283,7 +283,7 @@ struct prctl_mm_map { /* Memory deny write / execute */ #define PR_SET_MDWE 65 -# define PR_MDWE_REFUSE_EXEC_GAIN 1 +# define PR_MDWE_REFUSE_EXEC_GAIN (1UL << 0) #define PR_GET_MDWE 66 -- 2.40.1.606.ga4b1b128d6-goog