From nobody Tue Feb 10 21:38:47 2026 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 E93B1C77B7F for ; Thu, 11 May 2023 13:23:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238293AbjEKNXf (ORCPT ); Thu, 11 May 2023 09:23:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238118AbjEKNXP (ORCPT ); Thu, 11 May 2023 09:23:15 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D56A71157A for ; Thu, 11 May 2023 06:21:37 -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 BA32B165C; Thu, 11 May 2023 06:22:08 -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 1F4EA3F5A1; Thu, 11 May 2023 06:21:23 -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: [RESEND PATCH v1 1/5] mm: vmalloc must set pte via arch code Date: Thu, 11 May 2023 14:21:09 +0100 Message-Id: <20230511132113.80196-2-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230511132113.80196-1-ryan.roberts@arm.com> References: <20230511132113.80196-1-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Acked-by: Lorenzo Stoakes Reviewed-by: Christoph Hellwig --- 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 =3D private; + pte_t ptent; if (WARN_ON_ONCE(pfn_valid(data->pfns[data->idx]))) return -EINVAL; - *pte =3D pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); + + ptent =3D pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); + set_pte_at(&init_mm, addr, pte, ptent); return 0; } -- 2.25.1