From patchwork Fri May 19 01:19:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 13247588 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 1EE7FC7EE32 for ; Fri, 19 May 2023 01:19:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230298AbjESBTf (ORCPT ); Thu, 18 May 2023 21:19:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230402AbjESBTb (ORCPT ); Thu, 18 May 2023 21:19:31 -0400 Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39F94E4C for ; Thu, 18 May 2023 18:19:30 -0700 (PDT) Received: by mail-pf1-x434.google.com with SMTP id d2e1a72fcca58-64384c6797eso2123266b3a.2 for ; Thu, 18 May 2023 18:19:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1684459169; x=1687051169; 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=DlYfhs3BTQ2EJ5c00OoF7xAAokRQfPc4lQTpfzHm9OE=; b=JWIfslA4UKDBw1Mp583btzlGGK8G9E6xpS7M8yt3iOyE0agyVlu+KO5Lxq4vpucXSU HH1YA4BQeb7OL6OLVkoix4UxlcxXNVOrDy2c5gWBw82vyYqfMb8tY9sDkBb9j+Na0b8j 0kO3Cd+a0jrUOyQcvN7J2vDvvbkTYN/CiGCqY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684459169; x=1687051169; 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=DlYfhs3BTQ2EJ5c00OoF7xAAokRQfPc4lQTpfzHm9OE=; b=aPQJECkOx4lF6hs9USwZYMyo2Y3hn7JSnB/9+kbijcIo7ndb26mDfZk1RETJcu2TXw jJG6+4Ge8PEmiEgRN5eIQ4cuh4H8776V61J+ItVzw4Uql3thuSnt2M3ehGCKMC82QtX7 +Gd5g9kvpWh8ZYwm86lPkW3RUpTQ1GZ/p60hYLHbpnicS56Sm3zrkaa53/EqMK3xSZff J4jKiUcRxFEO+Sg3flPr7Ru3vtjMmKMa+RXnAj09HNdtKF0n2JVBLVb6XF891YZM/47J bxo9Fh9gJAuJdOejhb9R6NwIshx/P621ImQTr/JYaGPWHpniEpKU+tmkSDlaBEOMOVxG U5dA== X-Gm-Message-State: AC+VfDzWjznMEs0G7G5DeWXFrvVPCRMm4K5yEfUu0YoYhjUGdFCx1ty6 24GiXkoPLqGjU81csaVRCpoEcA== X-Google-Smtp-Source: ACHHUZ65BMUPG6NH0sSEE5yDD+qKd1DPXj0Iug+5r1nNE9fAXNvkKS48swgrqtg3LFDKz96p8HSxUA== X-Received: by 2002:a05:6a20:8422:b0:ef:205f:8184 with SMTP id c34-20020a056a20842200b000ef205f8184mr425525pzd.13.1684459169739; Thu, 18 May 2023 18:19:29 -0700 (PDT) Received: from localhost (183.43.230.35.bc.googleusercontent.com. [35.230.43.183]) by smtp.gmail.com with UTF8SMTPSA id c24-20020a62e818000000b00643864d03dfsm1960424pfi.171.2023.05.18.18.19.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 May 2023 18:19:29 -0700 (PDT) From: jeffxu@chromium.org To: dave.hansen@intel.com, luto@kernel.org, jorgelo@chromium.org, keescook@chromium.org, groeck@chromium.org, jannh@google.com, sroettger@google.com Cc: akpm@linux-foundation.org, jeffxu@google.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-hardening@vger.kernel.org Subject: [PATCH v1 3/6] PKEY: Apply PKEY_ENFORCE_API to mprotect Date: Fri, 19 May 2023 01:19:11 +0000 Message-ID: <20230519011915.846407-4-jeffxu@chromium.org> X-Mailer: git-send-email 2.40.1.698.g37aff9b760-goog In-Reply-To: <20230519011915.846407-1-jeffxu@chromium.org> References: <20230519011915.846407-1-jeffxu@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org From: Jeff Xu This patch enables PKEY_ENFORCE_API for the mprotect and mprotect_pkey syscalls. Signed-off-by: Jeff Xu --- mm/mprotect.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/mprotect.c b/mm/mprotect.c index 8a68fdca8487..1db30b8baac3 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -794,6 +794,17 @@ static int do_mprotect_pkey(unsigned long start, size_t len, } } + /* + * arch_check_pkey_enforce_api checks if current thread + * has the PKEY permission to modify the memory mapping. + * Note: this should only apply to the cases that do_mprotect_pkey + * is called from syscall entry. Ref. to munmap for other cases. + */ + if (arch_check_pkey_enforce_api(current->mm, start, end) < 0) { + error = -EACCES; + goto out; + } + prev = vma_prev(&vmi); if (start > vma->vm_start) prev = vma;