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authorAndrey Konovalov <andreyknvl@google.com>2021-02-26 02:20:15 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 18:41:03 +0100
commitb87c28b9a7ef64590943435ea59f40092f2376d5 (patch)
treedc31d890f4c6d5545edd851096fcfdf8fbb66d81 /lib
parentkasan: unify large kfree checks (diff)
downloadlinux-b87c28b9a7ef64590943435ea59f40092f2376d5.tar.xz
linux-b87c28b9a7ef64590943435ea59f40092f2376d5.zip
kasan: rework krealloc tests
This patch reworks KASAN-KUnit tests for krealloc() to: 1. Check both slab and page_alloc based krealloc() implementations. 2. Allow at least one full granule to fit between old and new sizes for each KASAN mode, and check accesses to that granule accordingly. Link: https://lkml.kernel.org/r/c707f128a2bb9f2f05185d1eb52192cf179cf4fa.1612546384.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/test_kasan.c91
1 files changed, 81 insertions, 10 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 25576303897b..e1bd1d1096de 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -252,11 +252,14 @@ static void kmalloc_large_oob_right(struct kunit *test)
kfree(ptr);
}
-static void kmalloc_oob_krealloc_more(struct kunit *test)
+static void krealloc_more_oob_helper(struct kunit *test,
+ size_t size1, size_t size2)
{
char *ptr1, *ptr2;
- size_t size1 = 17;
- size_t size2 = 19;
+ size_t middle;
+
+ KUNIT_ASSERT_LT(test, size1, size2);
+ middle = size1 + (size2 - size1) / 2;
ptr1 = kmalloc(size1, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
@@ -264,15 +267,31 @@ static void kmalloc_oob_krealloc_more(struct kunit *test)
ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
- KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x');
+ /* All offsets up to size2 must be accessible. */
+ ptr2[size1 - 1] = 'x';
+ ptr2[size1] = 'x';
+ ptr2[middle] = 'x';
+ ptr2[size2 - 1] = 'x';
+
+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
+
+ /* For all modes first aligned offset after size2 must be inaccessible. */
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
+
kfree(ptr2);
}
-static void kmalloc_oob_krealloc_less(struct kunit *test)
+static void krealloc_less_oob_helper(struct kunit *test,
+ size_t size1, size_t size2)
{
char *ptr1, *ptr2;
- size_t size1 = 17;
- size_t size2 = 15;
+ size_t middle;
+
+ KUNIT_ASSERT_LT(test, size2, size1);
+ middle = size2 + (size1 - size2) / 2;
ptr1 = kmalloc(size1, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
@@ -280,10 +299,60 @@ static void kmalloc_oob_krealloc_less(struct kunit *test)
ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
- KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x');
+ /* Must be accessible for all modes. */
+ ptr2[size2 - 1] = 'x';
+
+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
+
+ /* For all modes first aligned offset after size2 must be inaccessible. */
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
+
+ /*
+ * For all modes all size2, middle, and size1 should land in separate
+ * granules and thus the latter two offsets should be inaccessible.
+ */
+ KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE),
+ round_down(middle, KASAN_GRANULE_SIZE));
+ KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE),
+ round_down(size1, KASAN_GRANULE_SIZE));
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x');
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x');
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x');
+
kfree(ptr2);
}
+static void krealloc_more_oob(struct kunit *test)
+{
+ krealloc_more_oob_helper(test, 201, 235);
+}
+
+static void krealloc_less_oob(struct kunit *test)
+{
+ krealloc_less_oob_helper(test, 235, 201);
+}
+
+static void krealloc_pagealloc_more_oob(struct kunit *test)
+{
+ /* page_alloc fallback in 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)
+{
+ /* page_alloc fallback in only implemented for SLUB. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235,
+ KMALLOC_MAX_CACHE_SIZE + 201);
+}
+
static void kmalloc_oob_16(struct kunit *test)
{
struct {
@@ -977,8 +1046,10 @@ static struct kunit_case kasan_kunit_test_cases[] = {
KUNIT_CASE(pagealloc_oob_right),
KUNIT_CASE(pagealloc_uaf),
KUNIT_CASE(kmalloc_large_oob_right),
- KUNIT_CASE(kmalloc_oob_krealloc_more),
- KUNIT_CASE(kmalloc_oob_krealloc_less),
+ KUNIT_CASE(krealloc_more_oob),
+ KUNIT_CASE(krealloc_less_oob),
+ KUNIT_CASE(krealloc_pagealloc_more_oob),
+ KUNIT_CASE(krealloc_pagealloc_less_oob),
KUNIT_CASE(kmalloc_oob_16),
KUNIT_CASE(kmalloc_uaf_16),
KUNIT_CASE(kmalloc_oob_in_memset),