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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65EE5C38159 for ; Thu, 19 Jan 2023 01:19:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230002AbjASBTb (ORCPT ); Wed, 18 Jan 2023 20:19:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230006AbjASBRn (ORCPT ); Wed, 18 Jan 2023 20:17:43 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D023A6921B for ; Wed, 18 Jan 2023 17:15:35 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8692BB81FBB for ; Thu, 19 Jan 2023 01:15:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32E1FC433EF; Thu, 19 Jan 2023 01:15:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1674090933; bh=ZnATWSfeh/vC7kIB7ANFpinXfBOxk+Owi1C7NHT7fBs=; h=Date:To:From:Subject:From; b=1rSfktpnUGYknK8DohxKKkASbBYTBm9lf97TnmHNZ7f2MD957MQgGxxilWFBH+KnC cfELpv2wiD7XUGimYS0M8RifFQ2dW72vvyeqkpkLFcjntlhZRWGeJZiwEQ8qXZ8tIF DQx4BlgDGTLtBK3CuR2kM8R1PXufbMenvq1yr8D0= Date: Wed, 18 Jan 2023 17:15:32 -0800 To: mm-commits@vger.kernel.org, peterx@redhat.com, nadav.amit@gmail.com, hughd@google.com, aarcange@redhat.com, david@redhat.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-mprotect-drop-pgprot_t-parameter-from-change_protection.patch removed from -mm tree Message-Id: <20230119011533.32E1FC433EF@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: mm/mprotect: drop pgprot_t parameter from change_protection() has been removed from the -mm tree. Its filename was mm-mprotect-drop-pgprot_t-parameter-from-change_protection.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: David Hildenbrand Subject: mm/mprotect: drop pgprot_t parameter from change_protection() Date: Fri, 23 Dec 2022 16:56:16 +0100 Being able to provide a custom protection opens the door for inconsistencies and BUGs: for example, accidentally allowing for more permissions than desired by other mechanisms (e.g., softdirty tracking). vma->vm_page_prot should be the single source of truth. Only PROT_NUMA is special: there is no way we can erroneously allow for more permissions when removing all permissions. Special-case using the MM_CP_PROT_NUMA flag. [david@redhat.com: PAGE_NONE might not be defined without CONFIG_NUMA_BALANCING] Link: https://lkml.kernel.org/r/5084ff1c-ebb3-f918-6a60-bacabf550a88@redhat.com Link: https://lkml.kernel.org/r/20221223155616.297723-3-david@redhat.com Signed-off-by: David Hildenbrand Cc: Andrea Arcangeli Cc: Hugh Dickins Cc: Nadav Amit Cc: Peter Xu Signed-off-by: Andrew Morton --- include/linux/mm.h | 3 +-- mm/mempolicy.c | 3 +-- mm/mprotect.c | 18 +++++++++++++++--- mm/userfaultfd.c | 3 +-- 4 files changed, 18 insertions(+), 9 deletions(-) --- a/include/linux/mm.h~mm-mprotect-drop-pgprot_t-parameter-from-change_protection +++ a/include/linux/mm.h @@ -2134,8 +2134,7 @@ bool can_change_pte_writable(struct vm_a pte_t pte); extern unsigned long change_protection(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, - unsigned long end, pgprot_t newprot, - unsigned long cp_flags); + unsigned long end, unsigned long cp_flags); extern int mprotect_fixup(struct mmu_gather *tlb, struct vm_area_struct *vma, struct vm_area_struct **pprev, unsigned long start, unsigned long end, unsigned long newflags); --- a/mm/mempolicy.c~mm-mprotect-drop-pgprot_t-parameter-from-change_protection +++ a/mm/mempolicy.c @@ -635,8 +635,7 @@ unsigned long change_prot_numa(struct vm tlb_gather_mmu(&tlb, vma->vm_mm); - nr_updated = change_protection(&tlb, vma, addr, end, PAGE_NONE, - MM_CP_PROT_NUMA); + nr_updated = change_protection(&tlb, vma, addr, end, MM_CP_PROT_NUMA); if (nr_updated) count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated); --- a/mm/mprotect.c~mm-mprotect-drop-pgprot_t-parameter-from-change_protection +++ a/mm/mprotect.c @@ -507,13 +507,25 @@ static unsigned long change_protection_r unsigned long change_protection(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, - unsigned long end, pgprot_t newprot, - unsigned long cp_flags) + unsigned long end, unsigned long cp_flags) { + pgprot_t newprot = vma->vm_page_prot; unsigned long pages; BUG_ON((cp_flags & MM_CP_UFFD_WP_ALL) == MM_CP_UFFD_WP_ALL); +#ifdef CONFIG_NUMA_BALANCING + /* + * Ordinary protection updates (mprotect, uffd-wp, softdirty tracking) + * are expected to reflect their requirements via VMA flags such that + * vma_set_page_prot() will adjust vma->vm_page_prot accordingly. + */ + if (cp_flags & MM_CP_PROT_NUMA) + newprot = PAGE_NONE; +#else + WARN_ON_ONCE(cp_flags & MM_CP_PROT_NUMA); +#endif + if (is_vm_hugetlb_page(vma)) pages = hugetlb_change_protection(vma, start, end, newprot, cp_flags); @@ -642,7 +654,7 @@ success: mm_cp_flags |= MM_CP_TRY_CHANGE_WRITABLE; vma_set_page_prot(vma); - change_protection(tlb, vma, start, end, vma->vm_page_prot, mm_cp_flags); + change_protection(tlb, vma, start, end, mm_cp_flags); /* * Private VM_LOCKED VMA becoming writable: trigger COW to avoid major --- a/mm/userfaultfd.c~mm-mprotect-drop-pgprot_t-parameter-from-change_protection +++ a/mm/userfaultfd.c @@ -730,8 +730,7 @@ void uffd_wp_range(struct mm_struct *dst if (!enable_wp && vma_wants_manual_pte_write_upgrade(dst_vma)) mm_cp_flags |= MM_CP_TRY_CHANGE_WRITABLE; tlb_gather_mmu(&tlb, dst_mm); - change_protection(&tlb, dst_vma, start, start + len, vma->vm_page_prot, - mm_cp_flags); + change_protection(&tlb, dst_vma, start, start + len, mm_cp_flags); tlb_finish_mmu(&tlb); } _ Patches currently in -mm which might be from david@redhat.com are mm-debug_vm_pgtable-more-pte_swp_exclusive-sanity-checks.patch mm-debug_vm_pgtable-more-pte_swp_exclusive-sanity-checks-fix.patch alpha-mm-support-__have_arch_pte_swp_exclusive.patch arc-mm-support-__have_arch_pte_swp_exclusive.patch arm-mm-support-__have_arch_pte_swp_exclusive.patch csky-mm-support-__have_arch_pte_swp_exclusive.patch hexagon-mm-support-__have_arch_pte_swp_exclusive.patch ia64-mm-support-__have_arch_pte_swp_exclusive.patch loongarch-mm-support-__have_arch_pte_swp_exclusive.patch m68k-mm-remove-dummy-__swp-definitions-for-nommu.patch m68k-mm-support-__have_arch_pte_swp_exclusive.patch microblaze-mm-support-__have_arch_pte_swp_exclusive.patch mips-mm-support-__have_arch_pte_swp_exclusive.patch nios2-mm-refactor-swap-pte-layout.patch nios2-mm-support-__have_arch_pte_swp_exclusive.patch openrisc-mm-support-__have_arch_pte_swp_exclusive.patch parisc-mm-support-__have_arch_pte_swp_exclusive.patch powerpc-mm-support-__have_arch_pte_swp_exclusive-on-32bit-book3s.patch powerpc-nohash-mm-support-__have_arch_pte_swp_exclusive.patch riscv-mm-support-__have_arch_pte_swp_exclusive.patch sh-mm-support-__have_arch_pte_swp_exclusive.patch sparc-mm-support-__have_arch_pte_swp_exclusive-on-32bit.patch sparc-mm-support-__have_arch_pte_swp_exclusive-on-64bit.patch um-mm-support-__have_arch_pte_swp_exclusive.patch x86-mm-support-__have_arch_pte_swp_exclusive-also-on-32bit.patch xtensa-mm-support-__have_arch_pte_swp_exclusive.patch mm-remove-__have_arch_pte_swp_exclusive.patch