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[2620:137:e000::1:20]) by mx.google.com with ESMTP id c13-20020a509f8d000000b0047870adb266si1017308edf.593.2022.12.17.10.56.49; Sat, 17 Dec 2022 10:57:12 -0800 (PST) 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=@linutronix.de header.s=2020 header.b="G1G58/Gb"; dkim=neutral (no key) header.i=@linutronix.de; 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=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230191AbiLQS4G (ORCPT + 99 others); Sat, 17 Dec 2022 13:56:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229996AbiLQSzg (ORCPT ); Sat, 17 Dec 2022 13:55:36 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D7C910B7B; Sat, 17 Dec 2022 10:55:35 -0800 (PST) Date: Sat, 17 Dec 2022 18:55:30 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1671303331; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=nt5Z13x7cPRUra6u/EdfRu87/NpycaDyh7wrSUQR9ck=; b=G1G58/Gb5ndyH6ooxLbFLJ29hJyHGVkqlNF5UoKuCGT5brcQZi+ZV1m4jlDHfk8u4KQ5Mi jYVnmlTH5U5VcZnPu7JbSUnmeGHMmOA43sPoGpMwzWdrVgkK8fhVbfCl+O29jqBXd1KtnX sNDaDTg5V7bSB/aafQydz804ftw0v75hkZUSA/uL9nP8jJTkXOSvMOOnEt9X4L7ZJiw+ys LhRkR4KHoCgmRSga9NEpxEYhv5lbpcjVYg/DQfm/Zuxs6i6aGQEzlxf5UMQVxISlXHoLRK GMpURkDBBC+QQ77h8/jNJWcll9PwO7xGAjR6vQ1EDBFizDHbeC1WjqQpbJ103w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1671303331; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=nt5Z13x7cPRUra6u/EdfRu87/NpycaDyh7wrSUQR9ck=; b=cRUVvfO1HZ2uAoa2pDPSwPdMWrt4SEMgBjfs4F6hFNTu1OSrf8LGf+bw9h9NiX5W8IsN9I yARtmsIK93SidfAA== From: "tip-bot2 for Peter Zijlstra" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/mm] x86/mm: Inhibit _PAGE_NX changes from cpa_process_alias() Cc: kernel test robot , "Peter Zijlstra (Intel)" , x86@kernel.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-ID: <167130333070.4906.17678564285729472836.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752488667986955649?= X-GMAIL-MSGID: =?utf-8?q?1752488667986955649?= The following commit has been merged into the x86/mm branch of tip: Commit-ID: d597416683d587e940faa35945fba162329b5a71 Gitweb: https://git.kernel.org/tip/d597416683d587e940faa35945fba162329b5a71 Author: Peter Zijlstra AuthorDate: Thu, 10 Nov 2022 13:33:57 +01:00 Committer: Dave Hansen CommitterDate: Thu, 15 Dec 2022 10:37:28 -08:00 x86/mm: Inhibit _PAGE_NX changes from cpa_process_alias() There is a cludge in change_page_attr_set_clr() that inhibits propagating NX changes to the aliases (directmap and highmap) -- this is a cludge twofold: - it also inhibits the primary checks in __change_page_attr(); - it hard depends on single bit changes. The introduction of set_memory_rox() triggered this last issue for clearing both _PAGE_RW and _PAGE_NX. Explicitly ignore _PAGE_NX in cpa_process_alias() instead. Fixes: b38994948567 ("x86/mm: Implement native set_memory_rox()") Reported-by: kernel test robot Debugged-by: Dave Hansen Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20221110125544.594991716%40infradead.org --- arch/x86/mm/pat/set_memory.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 4943f6c..beef774 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1669,6 +1669,12 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); alias_cpa.curpage = 0; + /* Directmap always has NX set, do not modify. */ + if (__supported_pte_mask & _PAGE_NX) { + alias_cpa.mask_clr.pgprot &= ~_PAGE_NX; + alias_cpa.mask_set.pgprot &= ~_PAGE_NX; + } + cpa->force_flush_all = 1; ret = __change_page_attr_set_clr(&alias_cpa, 0); @@ -1691,6 +1697,15 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); alias_cpa.curpage = 0; + /* + * [_text, _brk_end) also covers data, do not modify NX except + * in cases where the highmap is the primary target. + */ + if (__supported_pte_mask & _PAGE_NX) { + alias_cpa.mask_clr.pgprot &= ~_PAGE_NX; + alias_cpa.mask_set.pgprot &= ~_PAGE_NX; + } + cpa->force_flush_all = 1; /* * The high mapping range is imprecise, so ignore the @@ -1709,6 +1724,12 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias) unsigned long rempages = numpages; int ret = 0; + /* + * No changes, easy! + */ + if (!(pgprot_val(cpa->mask_set) | pgprot_val(cpa->mask_clr))) + return ret; + while (rempages) { /* * Store the remaining nr of pages for the large page @@ -1755,7 +1776,7 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages, struct page **pages) { struct cpa_data cpa; - int ret, cache, checkalias; + int ret, cache; memset(&cpa, 0, sizeof(cpa)); @@ -1805,10 +1826,7 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages, cpa.curpage = 0; cpa.force_split = force_split; - /* No alias checking for _NX bit modifications */ - checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX; - - ret = __change_page_attr_set_clr(&cpa, checkalias); + ret = __change_page_attr_set_clr(&cpa, 1); /* * Check whether we really changed something: