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kasan: add kunit tests for kmalloc_track_caller, kmalloc_node_track_caller

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The Kunit tests for kmalloc_track_caller and kmalloc_node_track_caller
were missing in kasan_test_c.c, which check that these functions poison
the memory properly.

Add a Kunit test:
-> kmalloc_tracker_caller_oob_right(): This includes out-of-bounds
   access test for kmalloc_track_caller and kmalloc_node_track_caller.

Link: https://lkml.kernel.org/r/20241014190128.442059-1-niharchaithanya@gmail.com
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216509
Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nihar Chaithanya 2024-10-15 00:31:30 +05:30 committed by Andrew Morton
parent 1857099c18
commit 3738290bfc
1 changed files with 31 additions and 0 deletions
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31
mm/kasan/kasan_test_c.c
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@ -215,6 +215,36 @@ static void kmalloc_node_oob_right(struct kunit *test)
kfree(ptr);
}
static void kmalloc_track_caller_oob_right(struct kunit *test)
{
char *ptr;
size_t size = 128 - KASAN_GRANULE_SIZE;
/*
* Check that KASAN detects out-of-bounds access for object allocated via
* kmalloc_track_caller().
*/
ptr = kmalloc_track_caller(size, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
OPTIMIZER_HIDE_VAR(ptr);
KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'y');
kfree(ptr);
/*
* Check that KASAN detects out-of-bounds access for object allocated via
* kmalloc_node_track_caller().
*/
ptr = kmalloc_node_track_caller(size, GFP_KERNEL, 0);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
OPTIMIZER_HIDE_VAR(ptr);
KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'y');
kfree(ptr);
}
/*
* 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.
@ -2015,6 +2045,7 @@ 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_track_caller_oob_right),
KUNIT_CASE(kmalloc_big_oob_right),
KUNIT_CASE(kmalloc_large_oob_right),
KUNIT_CASE(kmalloc_large_uaf),