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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable 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 7429AC2BA2B for ; Wed, 8 Apr 2020 12:38:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4509620787 for ; Wed, 8 Apr 2020 12:38:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728794AbgDHMim (ORCPT ); Wed, 8 Apr 2020 08:38:42 -0400 Received: from foss.arm.com ([217.140.110.172]:38334 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726977AbgDHMim (ORCPT ); Wed, 8 Apr 2020 08:38:42 -0400 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 87C1331B; Wed, 8 Apr 2020 05:38:41 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0ADA83F73D; Wed, 8 Apr 2020 05:38:37 -0700 (PDT) Date: Wed, 8 Apr 2020 13:38:36 +0100 From: Mark Rutland To: Christoph Hellwig Cc: Andrew Morton , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , x86@kernel.org, David Airlie , Daniel Vetter , Laura Abbott , Sumit Semwal , Sakari Ailus , Minchan Kim , Nitin Gupta , Robin Murphy , Christophe Leroy , Peter Zijlstra , linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , Catalin marinas Subject: Re: [PATCH 18/28] mm: enforce that vmap can't map pages executable Message-ID: <20200408123835.GB36478@lakrids.cambridge.arm.com> References: <20200408115926.1467567-1-hch@lst.de> <20200408115926.1467567-19-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200408115926.1467567-19-hch@lst.de> User-Agent: Mutt/1.11.1+11 (2f07cb52) (2018-12-01) Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On Wed, Apr 08, 2020 at 01:59:16PM +0200, Christoph Hellwig wrote: > To help enforcing the W^X protection don't allow remapping existing > pages as executable. > > Based on patch from Peter Zijlstra . > > Signed-off-by: Christoph Hellwig > --- > arch/x86/include/asm/pgtable_types.h | 6 ++++++ > include/asm-generic/pgtable.h | 4 ++++ > mm/vmalloc.c | 2 +- > 3 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h > index 947867f112ea..2e7c442cc618 100644 > --- a/arch/x86/include/asm/pgtable_types.h > +++ b/arch/x86/include/asm/pgtable_types.h > @@ -282,6 +282,12 @@ typedef struct pgprot { pgprotval_t pgprot; } pgprot_t; > > typedef struct { pgdval_t pgd; } pgd_t; > > +static inline pgprot_t pgprot_nx(pgprot_t prot) > +{ > + return __pgprot(pgprot_val(prot) | _PAGE_NX); > +} > +#define pgprot_nx pgprot_nx > + > #ifdef CONFIG_X86_PAE I reckon for arm64 we can do similar in our : #define pgprot_nx(pgprot_t prot) \ __pgprot_modify(prot, 0, PTE_PXN) ... matching the style of our existing pgprot_*() modifier helpers. Mark. > > /* > diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h > index 329b8c8ca703..8c5f9c29698b 100644 > --- a/include/asm-generic/pgtable.h > +++ b/include/asm-generic/pgtable.h > @@ -491,6 +491,10 @@ static inline int arch_unmap_one(struct mm_struct *mm, > #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) > #endif > > +#ifndef pgprot_nx > +#define pgprot_nx(prot) (prot) > +#endif > + > #ifndef pgprot_noncached > #define pgprot_noncached(prot) (prot) > #endif > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index 7356b3f07bd8..334c75251ddb 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -2390,7 +2390,7 @@ void *vmap(struct page **pages, unsigned int count, > if (!area) > return NULL; > > - if (map_kernel_range((unsigned long)area->addr, size, prot, > + if (map_kernel_range((unsigned long)area->addr, size, pgprot_nx(prot), > pages) < 0) { > vunmap(area->addr); > return NULL; > -- > 2.25.1 >