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 A204DE7D0AB for ; Thu, 21 Sep 2023 21:13:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230197AbjIUVNM (ORCPT ); Thu, 21 Sep 2023 17:13:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231191AbjIUVMv (ORCPT ); Thu, 21 Sep 2023 17:12:51 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 631B1A9E8; Thu, 21 Sep 2023 10:07:28 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DD95C611AA; Thu, 21 Sep 2023 16:30:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1695313828; bh=Snl0TDHOoq+PcJkslOz6yzyz3jV/ILGMNVGDPT3ALVI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Sy+EhpEKmklRoXizWavrDSv+mOOfZ2nUh7nbNkMhlDLbnh4hSgBtM2DfmKEv4UzUL Pv6q7E7wnTnnSz2jaiJSSK97ktzV1tSKKpfyQ3VEqmLQ/I+fVqkhoc6rt2Al+4iGM9 C9VSqdRkP4rrRuEL9YXgvk8jJTKJGqA4Ygoc1IFE= Date: Thu, 21 Sep 2023 09:30:26 -0700 From: Andrew Morton To: Ryan Roberts Cc: Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Gerald Schaefer , "David S. Miller" , Arnd Bergmann , Mike Kravetz , Muchun Song , SeongJae Park , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Anshuman Khandual , Peter Xu , Axel Rasmussen , Qi Zheng , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, Greg Kroah-Hartman Subject: Re: [PATCH v1 0/8] Fix set_huge_pte_at() panic on arm64 Message-Id: <20230921093026.230b2991be551093e397f462@linux-foundation.org> In-Reply-To: <20230921162007.1630149-1-ryan.roberts@arm.com> References: <20230921162007.1630149-1-ryan.roberts@arm.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Thu, 21 Sep 2023 17:19:59 +0100 Ryan Roberts wrote: > Hi All, > > This series fixes a bug in arm64's implementation of set_huge_pte_at(), which > can result in an unprivileged user causing a kernel panic. The problem was > triggered when running the new uffd poison mm selftest for HUGETLB memory. This > test (and the uffd poison feature) was merged for v6.6-rc1. However, upon > inspection there are multiple other pre-existing paths that can trigger this > bug. > > Ideally, I'd like to get this fix in for v6.6 if possible? And I guess it should > be backported too, given there are call sites where this can theoretically > happen that pre-date v6.6-rc1 (I've cc'ed stable@vger.kernel.org). This gets you a naggygram from Greg. The way to request a backport is to add cc:stable to all the changelogs. I'll make that change to my copy. > Ryan Roberts (8): > parisc: hugetlb: Convert set_huge_pte_at() to take vma > powerpc: hugetlb: Convert set_huge_pte_at() to take vma > riscv: hugetlb: Convert set_huge_pte_at() to take vma > s390: hugetlb: Convert set_huge_pte_at() to take vma > sparc: hugetlb: Convert set_huge_pte_at() to take vma > mm: hugetlb: Convert set_huge_pte_at() to take vma > arm64: hugetlb: Convert set_huge_pte_at() to take vma > arm64: hugetlb: Fix set_huge_pte_at() to work with all swap entries > > arch/arm64/include/asm/hugetlb.h | 2 +- > arch/arm64/mm/hugetlbpage.c | 22 ++++---------- > arch/parisc/include/asm/hugetlb.h | 2 +- > arch/parisc/mm/hugetlbpage.c | 4 +-- > .../include/asm/nohash/32/hugetlb-8xx.h | 3 +- > arch/powerpc/mm/book3s64/hugetlbpage.c | 2 +- > arch/powerpc/mm/book3s64/radix_hugetlbpage.c | 2 +- > arch/powerpc/mm/nohash/8xx.c | 2 +- > arch/powerpc/mm/pgtable.c | 7 ++++- > arch/riscv/include/asm/hugetlb.h | 2 +- > arch/riscv/mm/hugetlbpage.c | 3 +- > arch/s390/include/asm/hugetlb.h | 8 +++-- > arch/s390/mm/hugetlbpage.c | 8 ++++- > arch/sparc/include/asm/hugetlb.h | 8 +++-- > arch/sparc/mm/hugetlbpage.c | 8 ++++- > include/asm-generic/hugetlb.h | 6 ++-- > include/linux/hugetlb.h | 6 ++-- > mm/damon/vaddr.c | 2 +- > mm/hugetlb.c | 30 +++++++++---------- > mm/migrate.c | 2 +- > mm/rmap.c | 10 +++---- > mm/vmalloc.c | 5 +++- > 22 files changed, 80 insertions(+), 64 deletions(-) Looks scary but it's actually a fairly modest patchset. It could easily be all rolled into a single patch for ease of backporting. Maybe Greg has an opinion?