From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F212C43461 for ; Tue, 27 Apr 2021 20:44:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F207E613F3 for ; Tue, 27 Apr 2021 20:44:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F207E613F3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 757096B0083; Tue, 27 Apr 2021 16:44:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 708786B0085; Tue, 27 Apr 2021 16:44:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4BDB26B0087; Tue, 27 Apr 2021 16:44:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0218.hostedemail.com [216.40.44.218]) by kanga.kvack.org (Postfix) with ESMTP id 1F7F86B0083 for ; Tue, 27 Apr 2021 16:44:18 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id D00D8180AD81A for ; Tue, 27 Apr 2021 20:44:17 +0000 (UTC) X-FDA: 78079324554.35.208B2A2 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by imf28.hostedemail.com (Postfix) with ESMTP id A29FE2000247 for ; Tue, 27 Apr 2021 20:44:18 +0000 (UTC) IronPort-SDR: Beija8km84oX0A6h8P07XWDdy88mdDxCqp/IDO/34wrG0BVLfvUjqkDenNusmVb3qPk5rDkLiu kUy0kRGLypNQ== X-IronPort-AV: E=McAfee;i="6200,9189,9967"; a="194473684" X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="194473684" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:44:16 -0700 IronPort-SDR: r3TWbtMTBiUQNhzR3TWb82UOlWWTti3U9Z4774f4nj3VScF6wnlqZJmSzr2xnxXA8uZWc1jDtW DSl4Zm+9kPyg== X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="465623518" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:44:16 -0700 From: Yu-cheng Yu To: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang Cc: Yu-cheng Yu , "Kirill A . Shutemov" Subject: [PATCH v26 16/30] mm: Fixup places that call pte_mkwrite() directly Date: Tue, 27 Apr 2021 13:43:01 -0700 Message-Id: <20210427204315.24153-17-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210427204315.24153-1-yu-cheng.yu@intel.com> References: <20210427204315.24153-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: A29FE2000247 X-Stat-Signature: gt4oqrx6s8cub659cxyit84c6rfp5e4e X-Rspamd-Server: rspam02 Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf28; identity=mailfrom; envelope-from=""; helo=mga04.intel.com; client-ip=192.55.52.120 X-HE-DKIM-Result: none/none X-HE-Tag: 1619556258-65902 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When serving a page fault, maybe_mkwrite() makes a PTE writable if it is = in a writable vma. A shadow stack vma is writable, but its PTEs need _PAGE_DIRTY to be set to become writable. For this reason, maybe_mkwrite= () has been updated. There are a few places that call pte_mkwrite() directly, but have the same result as from maybe_mkwrite(). These sites need to be updated for shadow stack as well. Thus, change them to maybe_mkwrite(): - do_anonymous_page() and migrate_vma_insert_page() check VM_WRITE direct= ly and call pte_mkwrite(), which is the same as maybe_mkwrite(). Change them to maybe_mkwrite(). - In do_numa_page(), if the numa entry was writable, then pte_mkwrite() is called directly. Fix it by doing maybe_mkwrite(). Make the same changes to do_huge_pmd_numa_page(). - In change_pte_range(), pte_mkwrite() is called directly. Replace it wi= th maybe_mkwrite(). Signed-off-by: Yu-cheng Yu Reviewed-by: Kirill A. Shutemov Cc: Kees Cook --- v25: - Apply same changes to do_huge_pmd_numa_page() as to do_numa_page(). mm/huge_memory.c | 2 +- mm/memory.c | 5 ++--- mm/migrate.c | 3 +-- mm/mprotect.c | 2 +- 4 files changed, 5 insertions(+), 7 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8203bd6ae4bd..044029ef45cd 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1553,7 +1553,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *v= mf, pmd_t pmd) pmd =3D pmd_modify(pmd, vma->vm_page_prot); pmd =3D pmd_mkyoung(pmd); if (was_writable) - pmd =3D pmd_mkwrite(pmd); + pmd =3D maybe_pmd_mkwrite(pmd, vma); set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd); update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); unlock_page(page); diff --git a/mm/memory.c b/mm/memory.c index 550405fc3b5e..0cb1028b1c02 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3561,8 +3561,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault= *vmf) __SetPageUptodate(page); =20 entry =3D mk_pte(page, vma->vm_page_prot); - if (vma->vm_flags & VM_WRITE) - entry =3D pte_mkwrite(pte_mkdirty(entry)); + entry =3D maybe_mkwrite(pte_mkdirty(entry), vma); =20 vmf->pte =3D pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address, &vmf->ptl); @@ -4125,7 +4124,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf= ) pte =3D pte_modify(old_pte, vma->vm_page_prot); pte =3D pte_mkyoung(pte); if (was_writable) - pte =3D pte_mkwrite(pte); + pte =3D maybe_mkwrite(pte, vma); ptep_modify_prot_commit(vma, vmf->address, vmf->pte, old_pte, pte); update_mmu_cache(vma, vmf->address, vmf->pte); =20 diff --git a/mm/migrate.c b/mm/migrate.c index 62b81d5257aa..7251c88a3d64 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2976,8 +2976,7 @@ static void migrate_vma_insert_page(struct migrate_= vma *migrate, } } else { entry =3D mk_pte(page, vma->vm_page_prot); - if (vma->vm_flags & VM_WRITE) - entry =3D pte_mkwrite(pte_mkdirty(entry)); + entry =3D maybe_mkwrite(pte_mkdirty(entry), vma); } =20 ptep =3D pte_offset_map_lock(mm, pmdp, addr, &ptl); diff --git a/mm/mprotect.c b/mm/mprotect.c index 94188df1ee55..c1ce78d688b6 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -135,7 +135,7 @@ static unsigned long change_pte_range(struct vm_area_= struct *vma, pmd_t *pmd, if (dirty_accountable && pte_dirty(ptent) && (pte_soft_dirty(ptent) || !(vma->vm_flags & VM_SOFTDIRTY))) { - ptent =3D pte_mkwrite(ptent); + ptent =3D maybe_mkwrite(ptent, vma); } ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent); pages++; --=20 2.21.0