From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E6FF41A900 for ; Thu, 6 Aug 2026 23:14:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786058056; cv=none; b=rFqZAIzvOjmQ/Hra7AdK0yf+abd0vWgjiip+wBlksYM3eOv5/soDAlkf79P3jbVPRuQZde7wah0SH9yQDM1VEwYqenpyhYEtW5/8A3TXElqY0AaDLCHNHPgCWXx7xzmawjpzy/FvwNr2zK6uC8eB/xwdhIisRB62xt2VLjx0fbU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786058056; c=relaxed/simple; bh=2KBfwB++1Th/g8whs3XGAAKXm053xxEgVCkXo884IZM=; h=Date:To:From:Subject:Message-Id; b=DRG6bQKXmx4DpXZ9tn5EOP418euhUySvy0cTiWFfDFFmJq7d7nlrAjrOMPGTDgTtqvLYZVodv6zlLv4xPhJKlkLrQfOWqBC2hZOuJlPkla2rfnqqfKbYY6q0tifucr8bX78XdZPNDP2AbtH/UU3vCr01WIWOrF8oGO06a6gkonI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=ldXzqQVR; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="ldXzqQVR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E74F81F00A3A; Thu, 6 Aug 2026 23:14:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1786058055; bh=+BPsZn1FVjGtE2A3vb59phToLWavK8pcQEdvhK4RNAQ=; h=Date:To:From:Subject; b=ldXzqQVR+ET43EvqCp/r7eNBnTSQngsgqKOUpGddg0QguYHKya1LpJG8oEo00mmJQ sLRkye1hwGMVna/fj8XWfaVPyN/QANMTL9F4OhtXXVGCNccVpUPGb+qtFDsI7114Iq jWiaOiBm04ZeOBEEYAFKWcAsRWfMjIAVturF+3qw= Date: Thu, 06 Aug 2026 16:14:14 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon.patch removed from -mm tree Message-Id: <20260806231414.E74F81F00A3A@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: tools/testing/vma: add test to assert MAP_PRIVATE-/dev/zero is anon has been removed from the -mm tree. Its filename was tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: "Lorenzo Stoakes (ARM)" Subject: tools/testing/vma: add test to assert MAP_PRIVATE-/dev/zero is anon Date: Mon, 20 Jul 2026 15:38:40 +0100 Now we've made MAP_PRIVATE-mapped /dev/zero mappings truly anonymous, add a VMA userland test to assert that this is the case and everything is as we would expect for an anonymous mapping. Link: https://lore.kernel.org/20260720-b4-scalable-cow-virt-pgoff-v2-14-2d549757a76f@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Cc: Alistair Popple Cc: Arnd Bergmann Cc: Baolin Wang Cc: Barry Song Cc: Byungchul Park Cc: Chengming Zhou Cc: David Hildenbrand Cc: Dev Jain Cc: Greg Kroah-Hartman Cc: Gregory Price Cc: Harry Yoo Cc: "Huang, Ying" Cc: Jan Kara Cc: Jann Horn Cc: Joshua Hahn Cc: Kees Cook Cc: Lance Yang Cc: Liam R. Howlett Cc: Matthew Brost Cc: Matthew Wilcox (Oracle) Cc: Miaohe Lin Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Nico Pache Cc: Pedro Falcato Cc: Peter Xu Cc: Rakie Kim Cc: Rik van Riel Cc: Ryan Roberts Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: xu xin Cc: Zi Yan Signed-off-by: Andrew Morton --- tools/testing/vma/include/dup.h | 1 tools/testing/vma/tests/mmap.c | 50 ++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+) --- a/tools/testing/vma/include/dup.h~tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon +++ a/tools/testing/vma/include/dup.h @@ -20,6 +20,7 @@ struct task_struct *get_current(void); #define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) #define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) +#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi)) #define S_IFMT 00170000 #define S_IFCHR 0020000 --- a/tools/testing/vma/tests/mmap.c~tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon +++ a/tools/testing/vma/tests/mmap.c @@ -45,7 +45,57 @@ static bool test_mmap_region_basic(void) return true; } +static int dummy_mmap_prepare(struct vm_area_desc *desc) +{ + return 0; +} + +static bool test_pure_anon_dev_zero(void) +{ + const vma_flags_t vma_flags = mk_vma_flags(VMA_READ_BIT, VMA_WRITE_BIT, + VMA_MAYREAD_BIT, VMA_MAYWRITE_BIT); + const struct file_operations f_op = { + .mmap_prepare = dummy_mmap_prepare, + }; + struct inode inode = { + .i_mode = S_IFCHR, + .i_rdev = MKDEV(MEM_MAJOR, DEVZERO_MINOR), + }; + struct file file = { + .f_inode = &inode, + .f_op = &f_op, + }; + struct mm_struct mm = {}; + struct vm_area_struct *vma; + unsigned long addr; + VMA_ITERATOR(vmi, &mm, 0); + + current->mm = &mm; + + /* + * Map a MAP_PRIVATE-/dev/zero mapping at address 0x300000 with a page + * offset of 0x10, which we expect to be reset to the virtual page + * offset. + */ + addr = __mmap_region(&file, 0x300000, 0x3000, vma_flags, 0x10, NULL); + ASSERT_EQ(addr, 0x300000); + + /* Assert that it truly is an anonymous mapping. */ + vma = vma_lookup(&mm, addr); + ASSERT_NE(vma, NULL); + ASSERT_TRUE(vma_is_anonymous(vma)); + ASSERT_EQ(vma->vm_file, NULL); + ASSERT_EQ(vma->vm_private_data, NULL); + /* Expect virtual page offsets. */ + ASSERT_EQ(vma->vm_pgoff, 0x300); + ASSERT_EQ(vma_start_virt_pgoff(vma), 0x300); + + cleanup_mm(&mm, &vmi); + return true; +} + static void run_mmap_tests(int *num_tests, int *num_fail) { TEST(mmap_region_basic); + TEST(pure_anon_dev_zero); } _ Patches currently in -mm which might be from ljs@kernel.org are x86-mm-pat-acquire-init_mm-write-lock-on-collapse-to-avoid-uaf.patch x86-mm-pat-acquire-init_mm-read-lock-on-attribute-change-to-avoid-uaf.patch x86-mm-pat-allocate-split-page-tables-as-kernel-page-tables.patch mm-introduce-vma_flags_can_grow-and-vma_can_grow.patch mm-vma-update-do_mmap-to-use-vma_flags_t.patch mm-convert-__get_unmapped_area-to-use-vma_flags_t.patch mm-update-generic_get_unmapped_area-to-use-vma_flags_t.patch mm-prefer-mm-def_vma_flags-in-mm-logic.patch mm-vma-convert-vm_pgprot_modify-to-use-vma_flags_t-and-rename.patch mm-vma-rename-vma_get_page_prot-to-vma_flags_to_page_prot.patch mm-introduce-vma_get_page_prot-and-use-it.patch mm-vma-update-create_init_stack_vma-to-use-vma_flags_t.patch mm-vma-convert-miscellaneous-uses-of-vma-flags-in-core-mm.patch mm-mlock-convert-mlock-code-to-use-vma_flags_t.patch mm-mprotect-convert-mprotect-code-to-use-vma_flags_t.patch mm-mremap-convert-mremap-code-to-use-vma_flags_t.patch mm-mseal-remove-superfluous-comments-fix-confusion-around-mm.patch mm-mseal-limit-scope-of-mseal-address-zero-to-address-zero.patch mm-mseal-remove-further-superfluous-comments-do_mseal.patch tools-testing-selftests-mm-add-map_private-dev-zero-merge-tests.patch mm-add-some-missing-includes-to-mm-local-headers.patch