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Date: Tue, 19 Dec 2023 23:29:01 +0100
From: andrey.konovalov@...ux.dev
To: Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
kasan-dev@...glegroups.com,
Evgenii Stepanov <eugenis@...gle.com>,
Breno Leitao <leitao@...ian.org>,
Alexander Lobakin <alobakin@...me>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm 17/21] kasan: rename pagealloc tests
From: Andrey Konovalov <andreyknvl@...gle.com>
Rename "pagealloc" KASAN tests:
1. Use "kmalloc_large" for tests that use large kmalloc allocations.
2. Use "page_alloc" for tests that use page_alloc.
Also clean up the comments.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
mm/kasan/kasan_test.c | 51 ++++++++++++++++++++++---------------------
1 file changed, 26 insertions(+), 25 deletions(-)
diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c
index 0ae4e93e9311..230958de7604 100644
--- a/mm/kasan/kasan_test.c
+++ b/mm/kasan/kasan_test.c
@@ -214,12 +214,13 @@ static void kmalloc_node_oob_right(struct kunit *test)
}
/*
- * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't
- * fit into a slab cache and therefore is allocated via the page allocator
- * fallback. Since this kind of fallback is only implemented for SLUB, these
- * tests are limited to that allocator.
+ * The kmalloc_large_* tests below use kmalloc() to allocate a memory chunk
+ * that does not fit into the largest slab cache and therefore is allocated via
+ * the page_alloc fallback for SLUB. SLAB has no such fallback, and thus these
+ * tests are not supported for it.
*/
-static void kmalloc_pagealloc_oob_right(struct kunit *test)
+
+static void kmalloc_large_oob_right(struct kunit *test)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
@@ -235,7 +236,7 @@ static void kmalloc_pagealloc_oob_right(struct kunit *test)
kfree(ptr);
}
-static void kmalloc_pagealloc_uaf(struct kunit *test)
+static void kmalloc_large_uaf(struct kunit *test)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
@@ -249,7 +250,7 @@ static void kmalloc_pagealloc_uaf(struct kunit *test)
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
}
-static void kmalloc_pagealloc_invalid_free(struct kunit *test)
+static void kmalloc_large_invalid_free(struct kunit *test)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
@@ -262,7 +263,7 @@ static void kmalloc_pagealloc_invalid_free(struct kunit *test)
KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1));
}
-static void pagealloc_oob_right(struct kunit *test)
+static void page_alloc_oob_right(struct kunit *test)
{
char *ptr;
struct page *pages;
@@ -284,7 +285,7 @@ static void pagealloc_oob_right(struct kunit *test)
free_pages((unsigned long)ptr, order);
}
-static void pagealloc_uaf(struct kunit *test)
+static void page_alloc_uaf(struct kunit *test)
{
char *ptr;
struct page *pages;
@@ -298,15 +299,15 @@ static void pagealloc_uaf(struct kunit *test)
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
}
-static void kmalloc_large_oob_right(struct kunit *test)
+/*
+ * Check that KASAN detects an out-of-bounds access for a big object allocated
+ * via kmalloc(). But not as big as to trigger the page_alloc fallback for SLUB.
+ */
+static void kmalloc_big_oob_right(struct kunit *test)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
- /*
- * Allocate a chunk that is large enough, but still fits into a slab
- * and does not trigger the page allocator fallback in SLUB.
- */
ptr = kmalloc(size, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
@@ -404,18 +405,18 @@ static void krealloc_less_oob(struct kunit *test)
krealloc_less_oob_helper(test, 235, 201);
}
-static void krealloc_pagealloc_more_oob(struct kunit *test)
+static void krealloc_large_more_oob(struct kunit *test)
{
- /* page_alloc fallback in only implemented for SLUB. */
+ /* page_alloc fallback is only implemented for SLUB. */
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201,
KMALLOC_MAX_CACHE_SIZE + 235);
}
-static void krealloc_pagealloc_less_oob(struct kunit *test)
+static void krealloc_large_less_oob(struct kunit *test)
{
- /* page_alloc fallback in only implemented for SLUB. */
+ /* page_alloc fallback is only implemented for SLUB. */
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235,
@@ -1816,16 +1817,16 @@ static struct kunit_case kasan_kunit_test_cases[] = {
KUNIT_CASE(kmalloc_oob_right),
KUNIT_CASE(kmalloc_oob_left),
KUNIT_CASE(kmalloc_node_oob_right),
- KUNIT_CASE(kmalloc_pagealloc_oob_right),
- KUNIT_CASE(kmalloc_pagealloc_uaf),
- KUNIT_CASE(kmalloc_pagealloc_invalid_free),
- KUNIT_CASE(pagealloc_oob_right),
- KUNIT_CASE(pagealloc_uaf),
KUNIT_CASE(kmalloc_large_oob_right),
+ KUNIT_CASE(kmalloc_large_uaf),
+ KUNIT_CASE(kmalloc_large_invalid_free),
+ KUNIT_CASE(page_alloc_oob_right),
+ KUNIT_CASE(page_alloc_uaf),
+ KUNIT_CASE(kmalloc_big_oob_right),
KUNIT_CASE(krealloc_more_oob),
KUNIT_CASE(krealloc_less_oob),
- KUNIT_CASE(krealloc_pagealloc_more_oob),
- KUNIT_CASE(krealloc_pagealloc_less_oob),
+ KUNIT_CASE(krealloc_large_more_oob),
+ KUNIT_CASE(krealloc_large_less_oob),
KUNIT_CASE(krealloc_uaf),
KUNIT_CASE(kmalloc_oob_16),
KUNIT_CASE(kmalloc_uaf_16),
--
2.25.1
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