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mm: kmsan: add test_uninit_page

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Test that pages allocated with alloc_page() are uninitialized by default.

Link: https://lkml.kernel.org/r/20260113091151.4035013-2-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko
2026-01-13 10:11:51 +01:00
committed by Andrew Morton
parent 79ffad20eb
commit 737dfe7d95
1 changed files with 15 additions and 0 deletions
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15
mm/kmsan/kmsan_test.c
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@@ -378,6 +378,20 @@ static void test_uaf(struct kunit *test)
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
}
static void test_uninit_page(struct kunit *test)
{
EXPECTATION_UNINIT_VALUE(expect);
struct page *page;
int *ptr;
kunit_info(test, "uninitialized page allocation (UMR report)\n");
page = alloc_pages(GFP_KERNEL, 0);
ptr = page_address(page);
USE(*ptr);
__free_pages(page, 0);
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
}
static volatile char *test_uaf_pages_helper(int order, int offset)
{
struct page *page;
@@ -727,6 +741,7 @@ static struct kunit_case kmsan_test_cases[] = {
KUNIT_CASE(test_uninit_kmsan_check_memory),
KUNIT_CASE(test_init_kmsan_vmap_vunmap),
KUNIT_CASE(test_init_vmalloc),
KUNIT_CASE(test_uninit_page),
KUNIT_CASE(test_uaf),
KUNIT_CASE(test_uaf_pages),
KUNIT_CASE(test_uaf_high_order_pages),