From owner-svn-src-head@freebsd.org Wed Feb 14 23:35:48 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C2703F06617; Wed, 14 Feb 2018 23:35:48 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7201E73542; Wed, 14 Feb 2018 23:35:48 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 52D5A16A28; Wed, 14 Feb 2018 23:35:48 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w1ENZmfh002609; Wed, 14 Feb 2018 23:35:48 GMT (envelope-from cem@FreeBSD.org) Received: (from cem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w1ENZmVU002607; Wed, 14 Feb 2018 23:35:48 GMT (envelope-from cem@FreeBSD.org) Message-Id: <201802142335.w1ENZmVU002607@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: cem set sender to cem@FreeBSD.org using -f From: Conrad Meyer Date: Wed, 14 Feb 2018 23:35:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r329281 - in head/sys: amd64/amd64 i386/i386 X-SVN-Group: head X-SVN-Commit-Author: cem X-SVN-Commit-Paths: in head/sys: amd64/amd64 i386/i386 X-SVN-Commit-Revision: 329281 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Feb 2018 23:35:49 -0000 Author: cem Date: Wed Feb 14 23:35:47 2018 New Revision: 329281 URL: https://svnweb.freebsd.org/changeset/base/329281 Log: x86 pmap: Make memory mapped via pmap_qenter() non-executable The idea is, the pmap_qenter() API is now defined to not produce executable mappings. If you need executable mappings, use another API. Add pg_nx flag in pmap_qenter on x86 to make kernel pages non-executable. Other architectures that support execute-specific permissons on page table entries should subsequently be updated to match. Submitted by: Darrick Lew Reviewed by: markj Discussed with: alc, jhb, kib Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D14062 Modified: head/sys/amd64/amd64/pmap.c head/sys/i386/i386/pmap.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Wed Feb 14 21:39:10 2018 (r329280) +++ head/sys/amd64/amd64/pmap.c Wed Feb 14 23:35:47 2018 (r329281) @@ -2338,7 +2338,7 @@ pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count) pa = VM_PAGE_TO_PHYS(m) | cache_bits; if ((*pte & (PG_FRAME | X86_PG_PTE_CACHE)) != pa) { oldpte |= *pte; - pte_store(pte, pa | pg_g | X86_PG_RW | X86_PG_V); + pte_store(pte, pa | pg_g | pg_nx | X86_PG_RW | X86_PG_V); } pte++; } Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Wed Feb 14 21:39:10 2018 (r329280) +++ head/sys/i386/i386/pmap.c Wed Feb 14 23:35:47 2018 (r329281) @@ -1677,7 +1677,11 @@ pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count) pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0); if ((*pte & (PG_FRAME | PG_PTE_CACHE)) != pa) { oldpte |= *pte; +#if defined(PAE) || defined(PAE_TABLES) + pte_store(pte, pa | pgeflag | pg_nx | PG_RW | PG_V); +#else pte_store(pte, pa | pgeflag | PG_RW | PG_V); +#endif } pte++; }