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[2620:137:e000::1:20]) by mx.google.com with ESMTP id y18-20020a63b512000000b0052c2061447dsi6805682pge.522.2023.05.11.06.03.57; Thu, 11 May 2023 06:04:15 -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; 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=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237787AbjEKM7O (ORCPT + 99 others); Thu, 11 May 2023 08:59:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237940AbjEKM7K (ORCPT ); Thu, 11 May 2023 08:59:10 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2F4DD6E89 for ; Thu, 11 May 2023 05:59:09 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6908C165C; Thu, 11 May 2023 05:59:53 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C26083F5A1; Thu, 11 May 2023 05:59:07 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , "Matthew Wilcox (Oracle)" , "Kirill A. Shutemov" , SeongJae Park Cc: Ryan Roberts , linux-kernel@vger.kernel.org, linux-mm@kvack.org, damon@lists.linux.dev Subject: [PATCH v1 1/5] mm: vmalloc must set pte via arch code Date: Thu, 11 May 2023 13:58:44 +0100 Message-Id: <20230511125848.78621-2-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230511125848.78621-1-ryan.roberts@arm.com> References: <20230511125848.78621-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE 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?1765603022453105659?= X-GMAIL-MSGID: =?utf-8?q?1765603022453105659?= It is bad practice to directly set pte entries within a pte table. Instead all modifications must go through arch-provided helpers such as set_pte_at() to give the arch code visibility and allow it to validate (and potentially modify) the operation. Fixes: 3e9a9e256b1e ("mm: add a vmap_pfn function") Signed-off-by: Ryan Roberts --- mm/vmalloc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 9683573f1225..d8d2fe797c55 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2899,10 +2899,13 @@ struct vmap_pfn_data { static int vmap_pfn_apply(pte_t *pte, unsigned long addr, void *private) { struct vmap_pfn_data *data = private; + pte_t ptent; if (WARN_ON_ONCE(pfn_valid(data->pfns[data->idx]))) return -EINVAL; - *pte = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); + + ptent = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); + set_pte_at(&init_mm, addr, pte, ptent); return 0; }