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UPSTREAM: kasan: test: clean up ksize_uaf

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Some KASAN tests use global variables to store function returns values so
that the compiler doesn't optimize away these functions.

ksize_uaf() doesn't call any functions, so it doesn't need to use
kasan_int_result.  Use volatile accesses instead, to be consistent with
other similar tests.

Link: https://lkml.kernel.org/r/a1fc34faca4650f4a6e4dfb3f8d8d82c82eb953a.1628779805.git.andreyknvl@gmail.com
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit b38fcca339)
Bug: 217222520
Change-Id: I0f020809edce3159aa49f6efd91997994170ac2f
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
This commit is contained in:
Andrey Konovalov
2021-09-02 14:57:47 -07:00
committed by Andrey Konovalov
parent 35e82c919e
commit 25d60dbd44
1 changed files with 2 additions and 2 deletions
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4
lib/test_kasan.c
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@@ -739,8 +739,8 @@ static void ksize_uaf(struct kunit *test)
kfree(ptr);
KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *ptr);
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *(ptr + size));
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
}
static void kasan_stack_oob(struct kunit *test)