From: Alexander Potapenko Date: Tue, 13 Jan 2026 09:11:51 +0000 (+0100) Subject: mm: kmsan: add test_uninit_page X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=737dfe7d95263ae8e47e07a528e3676ffad6f59a;p=thirdparty%2Fkernel%2Flinux.git mm: kmsan: add test_uninit_page 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 Cc: Dmitriy Vyukov Cc: Marco Elver Cc: Ryan Roberts Signed-off-by: Andrew Morton --- diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c index ba44bf2072bbe..81e642db6e239 100644 --- a/mm/kmsan/kmsan_test.c +++ b/mm/kmsan/kmsan_test.c @@ -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),