+ kasan-improve-vmalloc-tests-fix-2.patch added to -mm tree

+ kasan-improve-vmalloc-tests-fix-2.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: fix for "kasan: improve vmalloc tests"
has been added to the -mm tree.  Its filename is
     kasan-improve-vmalloc-tests-fix-2.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kasan-improve-vmalloc-tests-fix-2.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kasan-improve-vmalloc-tests-fix-2.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: fix for "kasan: improve vmalloc tests"

vmap_tags() and vm_map_ram_tags() pass invalid page array size to
vm_map_ram() and vm_unmap_ram().  It's supposed to be 1, but it's 1 <<
order == 2 currently.

Remove order variable (it can only be 0 with the current code) and
hardcode the number of pages in these tests.

Link: https://lkml.kernel.org/r/865c91ba49b90623ab50c7526b79ccb955f544f0.1644950160.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/test_kasan.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/lib/test_kasan.c~kasan-improve-vmalloc-tests-fix-2
+++ a/lib/test_kasan.c
@@ -1140,7 +1140,6 @@ static void vmap_tags(struct kunit *test
 {
 	char *p_ptr, *v_ptr;
 	struct page *p_page, *v_page;
-	size_t order = 1;
 
 	/*
 	 * This test is specifically crafted for the software tag-based mode,
@@ -1150,12 +1149,12 @@ static void vmap_tags(struct kunit *test
 
 	KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC);
 
-	p_page = alloc_pages(GFP_KERNEL, order);
+	p_page = alloc_pages(GFP_KERNEL, 1);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_page);
 	p_ptr = page_address(p_page);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr);
 
-	v_ptr = vmap(&p_page, 1 << order, VM_MAP, PAGE_KERNEL);
+	v_ptr = vmap(&p_page, 1, VM_MAP, PAGE_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
 
 	/*
@@ -1177,14 +1176,13 @@ static void vmap_tags(struct kunit *test
 	KUNIT_EXPECT_PTR_EQ(test, p_page, v_page);
 
 	vunmap(v_ptr);
-	free_pages((unsigned long)p_ptr, order);
+	free_pages((unsigned long)p_ptr, 1);
 }
 
 static void vm_map_ram_tags(struct kunit *test)
 {
 	char *p_ptr, *v_ptr;
 	struct page *page;
-	size_t order = 1;
 
 	/*
 	 * This test is specifically crafted for the software tag-based mode,
@@ -1192,12 +1190,12 @@ static void vm_map_ram_tags(struct kunit
 	 */
 	KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS);
 
-	page = alloc_pages(GFP_KERNEL, order);
+	page = alloc_pages(GFP_KERNEL, 1);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, page);
 	p_ptr = page_address(page);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr);
 
-	v_ptr = vm_map_ram(&page, 1 << order, -1);
+	v_ptr = vm_map_ram(&page, 1, -1);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
 
 	KUNIT_EXPECT_GE(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_MIN);
@@ -1207,8 +1205,8 @@ static void vm_map_ram_tags(struct kunit
 	*p_ptr = 0;
 	*v_ptr = 0;
 
-	vm_unmap_ram(v_ptr, 1 << order);
-	free_pages((unsigned long)p_ptr, order);
+	vm_unmap_ram(v_ptr, 1);
+	free_pages((unsigned long)p_ptr, 1);
 }
 
 static void vmalloc_percpu(struct kunit *test)
_

Patches currently in -mm which might be from andreyknvl@google.com are

kasan-test-prevent-cache-merging-in-kmem_cache_double_destroy.patch
kasan-page_alloc-deduplicate-should_skip_kasan_poison.patch
kasan-page_alloc-move-tag_clear_highpage-out-of-kernel_init_free_pages.patch
kasan-page_alloc-merge-kasan_free_pages-into-free_pages_prepare.patch
kasan-page_alloc-simplify-kasan_poison_pages-call-site.patch
kasan-page_alloc-init-memory-of-skipped-pages-on-free.patch
kasan-drop-skip_kasan_poison-variable-in-free_pages_prepare.patch
mm-clarify-__gfp_zerotags-comment.patch
kasan-only-apply-__gfp_zerotags-when-memory-is-zeroed.patch
kasan-page_alloc-refactor-init-checks-in-post_alloc_hook.patch
kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook.patch
kasan-page_alloc-combine-tag_clear_highpage-calls-in-post_alloc_hook.patch
kasan-page_alloc-move-setpageskipkasanpoison-in-post_alloc_hook.patch
kasan-page_alloc-move-kernel_init_free_pages-in-post_alloc_hook.patch
kasan-page_alloc-rework-kasan_unpoison_pages-call-site.patch
kasan-clean-up-metadata-byte-definitions.patch
kasan-define-kasan_vmalloc_invalid-for-sw_tags.patch
kasan-x86-arm64-s390-rename-functions-for-modules-shadow.patch
kasan-vmalloc-drop-outdated-vm_kasan-comment.patch
kasan-reorder-vmalloc-hooks.patch
kasan-add-wrappers-for-vmalloc-hooks.patch
kasan-vmalloc-reset-tags-in-vmalloc-functions.patch
kasan-fork-reset-pointer-tags-of-vmapped-stacks.patch
kasan-arm64-reset-pointer-tags-of-vmapped-stacks.patch
kasan-vmalloc-add-vmalloc-tagging-for-sw_tags.patch
kasan-vmalloc-arm64-mark-vmalloc-mappings-as-pgprot_tagged.patch
kasan-vmalloc-unpoison-vm_alloc-pages-after-mapping.patch
kasan-mm-only-define-___gfp_skip_kasan_poison-with-hw_tags.patch
kasan-page_alloc-allow-skipping-unpoisoning-for-hw_tags.patch
kasan-page_alloc-allow-skipping-memory-init-for-hw_tags.patch
kasan-vmalloc-add-vmalloc-tagging-for-hw_tags.patch
kasan-vmalloc-only-tag-normal-vmalloc-allocations.patch
kasan-arm64-dont-tag-executable-vmalloc-allocations.patch
kasan-mark-kasan_arg_stacktrace-as-__initdata.patch
kasan-clean-up-feature-flags-for-hw_tags-mode.patch
kasan-add-kasanvmalloc-command-line-flag.patch
kasan-allow-enabling-kasan_vmalloc-and-sw-hw_tags.patch
arm64-select-kasan_vmalloc-for-sw-hw_tags-modes.patch
kasan-documentation-updates.patch
kasan-improve-vmalloc-tests.patch
kasan-improve-vmalloc-tests-fix-2.patch