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[70.27.3.10]) by smtp.gmail.com with ESMTPSA id bj9-20020a05620a190900b006a6a7b4e7besm1878519qkb.109.2022.07.21.11.33.40 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 21 Jul 2022 11:33:41 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Nadav Amit , peterx@redhat.com, Andrew Morton , David Hildenbrand , Andrea Arcangeli Subject: [PATCH v3 1/3] mm/mprotect: Fix soft-dirty check in can_change_pte_writable() Date: Thu, 21 Jul 2022 14:33:36 -0400 Message-Id: <20220721183338.27871-2-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220721183338.27871-1-peterx@redhat.com> References: <20220721183338.27871-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The check wanted to make sure when soft-dirty tracking is enabled we won't grant write bit by accident, as a page fault is needed for dirty tracking. The intention is correct but we didn't check it right because VM_SOFTDIRTY set actually means soft-dirty tracking disabled. Fix it. There's another thing tricky about soft-dirty is that, we can't check the vma flag !(vma_flags & VM_SOFTDIRTY) directly but only check it after we checked CONFIG_MEM_SOFT_DIRTY because otherwise VM_SOFTDIRTY will be defined as zero, and !(vma_flags & VM_SOFTDIRTY) will constantly return true. To avoid misuse, introduce a helper for checking whether vma has soft-dirty tracking enabled. We can easily verify this with any exclusive anonymous page, like program below: =3D=3D=3D=3D=3D=3D=3D8<=3D=3D=3D=3D=3D=3D #include #include #include #include #include #include #include #include #include #include #include #include #include #define BIT_ULL(nr) (1ULL << (nr)) #define PM_SOFT_DIRTY BIT_ULL(55) unsigned int psize; char *page; uint64_t pagemap_read_vaddr(int fd, void *vaddr) { uint64_t value; int ret; ret =3D pread(fd, &value, sizeof(uint64_t), ((uint64_t)vaddr >> 12) * sizeof(uint64_t)); assert(ret =3D=3D sizeof(uint64_t)); return value; } void clear_refs_write(void) { int fd =3D open("/proc/self/clear_refs", O_RDWR); assert(fd >=3D 0); write(fd, "4", 2); close(fd); } #define check_soft_dirty(str, expect) do { \ bool dirty =3D pagemap_read_vaddr(fd, page) & PM_SOFT_DIRTY; = \ if (dirty !=3D expect) { = \ printf("ERROR: %s, soft-dirty=3D%d (expect: %d)\n", str, dirt= y, expect); \ exit(-1); \ } \ } while (0) int main(void) { int fd =3D open("/proc/self/pagemap", O_RDONLY); assert(fd >=3D 0); psize =3D getpagesize(); page =3D mmap(NULL, psize, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); assert(page !=3D MAP_FAILED); *page =3D 1; check_soft_dirty("Just faulted in page", 1); clear_refs_write(); check_soft_dirty("Clear_refs written", 0); mprotect(page, psize, PROT_READ); check_soft_dirty("Marked RO", 0); mprotect(page, psize, PROT_READ|PROT_WRITE); check_soft_dirty("Marked RW", 0); *page =3D 2; check_soft_dirty("Wrote page again", 1); munmap(page, psize); close(fd); printf("Test passed.\n"); return 0; } =3D=3D=3D=3D=3D=3D=3D8<=3D=3D=3D=3D=3D=3D Here we attach a Fixes to commit 64fe24a3e05e only for easy tracking, as this patch won't apply to a tree before that point. However the commit wasn't the source of problem, it's just that then anonymous memory will also suffer from this problem with mprotect(). Fixes: 64fe24a3e05e ("mm/mprotect: try avoiding write faults for exclusive = anonymous pages when changing protection") Signed-off-by: Peter Xu Reviewed-by: David Hildenbrand --- mm/internal.h | 18 ++++++++++++++++++ mm/mmap.c | 2 +- mm/mprotect.c | 2 +- 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 15e8cb118832..e2d442e3c0b2 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -860,4 +860,22 @@ struct folio *try_grab_folio(struct page *page, int re= fs, unsigned int flags); =20 DECLARE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); =20 +static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma) +{ + /* + * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty + * enablements, because when without soft-dirty being compiled in, + * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY) + * will be constantly true. + */ + if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) + return false; + + /* + * Soft-dirty is kind of special: its tracking is enabled when the + * vma flags not set. + */ + return !(vma->vm_flags & VM_SOFTDIRTY); +} + #endif /* __MM_INTERNAL_H */ diff --git a/mm/mmap.c b/mm/mmap.c index 125e8903c93c..93f9913409ea 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1518,7 +1518,7 @@ int vma_wants_writenotify(struct vm_area_struct *vma,= pgprot_t vm_page_prot) return 0; =20 /* Do we need to track softdirty? */ - if (IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) && !(vm_flags & VM_SOFTDIRTY)) + if (vma_soft_dirty_enabled(vma)) return 1; =20 /* Specialty mapping? */ diff --git a/mm/mprotect.c b/mm/mprotect.c index 0420c3ed936c..c403e84129d4 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -49,7 +49,7 @@ static inline bool can_change_pte_writable(struct vm_area= _struct *vma, return false; =20 /* Do we need write faults for softdirty tracking? */ - if ((vma->vm_flags & VM_SOFTDIRTY) && !pte_soft_dirty(pte)) + if (vma_soft_dirty_enabled(vma) && !pte_soft_dirty(pte)) return false; =20 /* Do we need write faults for uffd-wp tracking? */ --=20 2.32.0 From nobody Fri Apr 17 21:03:55 2026 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 60897CCA485 for ; Thu, 21 Jul 2022 18:33:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232106AbiGUSdu (ORCPT ); Thu, 21 Jul 2022 14:33:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229778AbiGUSdr (ORCPT ); Thu, 21 Jul 2022 14:33:47 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7D9D48C8E2 for ; Thu, 21 Jul 2022 11:33:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658428425; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nbIFjjgDA4ooaBqJdaxSYkeX6CtTRCPcitxkJ2jJ7zw=; b=fu2/XqBvmXDQ2TkRqQa8RnSAE3XepU07P6CCUQnUcg7npyhiu/BQ4CWQN/OeMjt56J+J0A jiroxlZRR9cMh6JRI1sX1hLI7JmuSpiuxLDyMQ2knljhi2SnPLhiePy0JBLl4DAccsiPMI poWyaT1R4CYf8uFsCSwLdpElzPunW68= Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-592-aWOPC14IMYOFqesp56s6Dw-1; Thu, 21 Jul 2022 14:33:44 -0400 X-MC-Unique: aWOPC14IMYOFqesp56s6Dw-1 Received: by mail-qk1-f197.google.com with SMTP id bk21-20020a05620a1a1500b006b5c24695a4so1924838qkb.15 for ; Thu, 21 Jul 2022 11:33:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=nbIFjjgDA4ooaBqJdaxSYkeX6CtTRCPcitxkJ2jJ7zw=; b=y6B08XesalBuaSj0WfQktwI00mSFFAyW1TmKOsktXA37A1e5oszQ476PIyyTLwXlXb PZ5BPjdGTiahmLgHDXzs9I9OFzTELnsMkdcdVfqAKUv7XKKz1FE0OwzApGev3xZraFzp +d/B/ligKOvr65JxL196wHu1dANQE0q3EEjWc+rHtMY2X5zP3CC1HTM/Tt2TEP14f5ph 6agdkbaRGKavQEtrh749rGsoBzAShrK4kCgaaKAlMF6LsLfXgYWoRLxxjtNomtU9VVYb h2l73oizO7pitsFgtCnsPqtuA/MFClXjJLXZGA1LjMY/4u1AT0me0qTbVeyqwWCe5XQQ 55FQ== X-Gm-Message-State: AJIora/HpyqoT5OrKc5NWET5LdtF0ubyOQydtF3x7ifYu7OaX9arGMvX N+JpVGqjgpaMp++Wuz1wFX6/3XOqkWp1KwwssjkqDSlV09Pf/AKAtfkfnyuzUpJkB6MivWb2F7s CLiEYdz5/uEyzon8HIoqLZy9FEKXiVNxrqSvTAsdiAsxEApTMe0oS1PXHG5LX+cXANifvRBuFzQ == X-Received: by 2002:a05:620a:4512:b0:6b6:2fe:6dc3 with SMTP id t18-20020a05620a451200b006b602fe6dc3mr9582942qkp.124.1658428423988; Thu, 21 Jul 2022 11:33:43 -0700 (PDT) X-Google-Smtp-Source: AGRyM1vyEE7j8jfEYZlnYclQKsnWvrL6a7mIg2DOWksGCUaTXhUXJZfkl0sPpefsfJuH4H4kzX7CcQ== X-Received: by 2002:a05:620a:4512:b0:6b6:2fe:6dc3 with SMTP id t18-20020a05620a451200b006b602fe6dc3mr9582910qkp.124.1658428423448; Thu, 21 Jul 2022 11:33:43 -0700 (PDT) Received: from localhost.localdomain (bras-base-aurron9127w-grc-35-70-27-3-10.dsl.bell.ca. [70.27.3.10]) by smtp.gmail.com with ESMTPSA id bj9-20020a05620a190900b006a6a7b4e7besm1878519qkb.109.2022.07.21.11.33.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 21 Jul 2022 11:33:42 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Nadav Amit , peterx@redhat.com, Andrew Morton , David Hildenbrand , Andrea Arcangeli Subject: [PATCH v3 2/3] selftests: soft-dirty: Add test for mprotect Date: Thu, 21 Jul 2022 14:33:37 -0400 Message-Id: <20220721183338.27871-3-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220721183338.27871-1-peterx@redhat.com> References: <20220721183338.27871-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add two soft-diryt test cases for mprotect() on both anon or file. Signed-off-by: Peter Xu --- tools/testing/selftests/vm/soft-dirty.c | 69 ++++++++++++++++++++++++- 1 file changed, 68 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/soft-dirty.c b/tools/testing/selfte= sts/vm/soft-dirty.c index 08ab62a4a9d0..7d93906aa43f 100644 --- a/tools/testing/selftests/vm/soft-dirty.c +++ b/tools/testing/selftests/vm/soft-dirty.c @@ -121,13 +121,78 @@ static void test_hugepage(int pagemap_fd, int pagesiz= e) free(map); } =20 +static void test_mprotect(int pagemap_fd, int pagesize, bool anon) +{ + const char *type[] =3D {"file", "anon"}; + const char *fname =3D "./soft-dirty-test-file"; + int test_fd; + char *map; + + if (anon) { + map =3D mmap(NULL, pagesize, PROT_READ|PROT_WRITE, + MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); + if (!map) + ksft_exit_fail_msg("anon mmap failed\n"); + } else { + unlink(fname); + test_fd =3D open(fname, O_RDWR | O_CREAT); + if (test_fd < 0) { + ksft_test_result_skip("Test %s huge page allocation\n", __func__); + return; + } + ftruncate(test_fd, pagesize); + map =3D mmap(NULL, pagesize, PROT_READ|PROT_WRITE, + MAP_SHARED, test_fd, 0); + if (!map) + ksft_exit_fail_msg("file mmap failed\n"); + } + + *map =3D 1; + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 1, + "Test %s-%s dirty bit of new written page\n", + __func__, type[anon]); + clear_softdirty(); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 0, + "Test %s-%s soft-dirty clear after clear_refs\n", + __func__, type[anon]); + mprotect(map, pagesize, PROT_READ); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 0, + "Test %s-%s soft-dirty clear after marking RO\n", + __func__, type[anon]); + mprotect(map, pagesize, PROT_READ|PROT_WRITE); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 0, + "Test %s-%s soft-dirty clear after marking RW\n", + __func__, type[anon]); + *map =3D 2; + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 1, + "Test %s-%s soft-dirty after rewritten\n", + __func__, type[anon]); + + munmap(map, pagesize); + + if (!anon) { + close(test_fd); + unlink(fname); + } +} + +static void test_mprotect_anon(int pagemap_fd, int pagesize) +{ + test_mprotect(pagemap_fd, pagesize, true); +} + +static void test_mprotect_file(int pagemap_fd, int pagesize) +{ + test_mprotect(pagemap_fd, pagesize, false); +} + int main(int argc, char **argv) { int pagemap_fd; int pagesize; =20 ksft_print_header(); - ksft_set_plan(5); + ksft_set_plan(15); =20 pagemap_fd =3D open(PAGEMAP_FILE_PATH, O_RDONLY); if (pagemap_fd < 0) @@ -138,6 +203,8 @@ int main(int argc, char **argv) test_simple(pagemap_fd, pagesize); test_vma_reuse(pagemap_fd, pagesize); test_hugepage(pagemap_fd, pagesize); + test_mprotect_anon(pagemap_fd, pagesize); + test_mprotect_file(pagemap_fd, pagesize); =20 close(pagemap_fd); =20 --=20 2.32.0 From nobody Fri Apr 17 21:03:55 2026 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 03B85C433EF for ; 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[70.27.3.10]) by smtp.gmail.com with ESMTPSA id bj9-20020a05620a190900b006a6a7b4e7besm1878519qkb.109.2022.07.21.11.33.43 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 21 Jul 2022 11:33:44 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Nadav Amit , peterx@redhat.com, Andrew Morton , David Hildenbrand , Andrea Arcangeli Subject: [PATCH v3 3/3] selftests: Add soft-dirty into run_vmtests.sh Date: Thu, 21 Jul 2022 14:33:38 -0400 Message-Id: <20220721183338.27871-4-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220721183338.27871-1-peterx@redhat.com> References: <20220721183338.27871-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Signed-off-by: Peter Xu Reviewed-by: David Hildenbrand --- tools/testing/selftests/vm/run_vmtests.sh | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/self= tests/vm/run_vmtests.sh index 2af563a9652e..de86983b8a0f 100755 --- a/tools/testing/selftests/vm/run_vmtests.sh +++ b/tools/testing/selftests/vm/run_vmtests.sh @@ -190,4 +190,6 @@ then run_test ./protection_keys_64 fi =20 +run_test ./soft-dirty + exit $exitcode --=20 2.32.0