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kasan: test: Silence GCC 12 warnings
[ Upstream commit aaf50b1969
]
GCC 12 continues to get smarter about array accesses. The KASAN tests
are expecting to explicitly test out-of-bounds conditions at run-time,
so hide the variable from GCC, to avoid warnings like:
../lib/test_kasan.c: In function 'ksize_uaf':
../lib/test_kasan.c:790:61: warning: array subscript 120 is outside array bounds of 'void[120]' [-Warray-bounds]
790 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
| ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
../lib/test_kasan.c:97:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_FAIL'
97 | expression; \
| ^~~~~~~~~~
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: kasan-dev@googlegroups.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220608214024.1068451-1-keescook@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
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1 changed files with 10 additions and 0 deletions
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@ -125,6 +125,7 @@ static void kmalloc_oob_right(struct kunit *test)
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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/*
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* An unaligned access past the requested kmalloc size.
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* Only generic KASAN can precisely detect these.
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@ -153,6 +154,7 @@ static void kmalloc_oob_left(struct kunit *test)
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1));
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kfree(ptr);
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}
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@ -165,6 +167,7 @@ static void kmalloc_node_oob_right(struct kunit *test)
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ptr = kmalloc_node(size, GFP_KERNEL, 0);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]);
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kfree(ptr);
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}
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@ -185,6 +188,7 @@ static void kmalloc_pagealloc_oob_right(struct kunit *test)
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0);
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kfree(ptr);
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@ -265,6 +269,7 @@ static void kmalloc_large_oob_right(struct kunit *test)
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
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kfree(ptr);
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}
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@ -404,6 +409,8 @@ static void kmalloc_oob_16(struct kunit *test)
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ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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OPTIMIZER_HIDE_VAR(ptr1);
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OPTIMIZER_HIDE_VAR(ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
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kfree(ptr1);
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kfree(ptr2);
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@ -712,6 +719,8 @@ static void ksize_unpoisons_memory(struct kunit *test)
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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real_size = ksize(ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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/* This access shouldn't trigger a KASAN report. */
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ptr[size] = 'x';
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@ -734,6 +743,7 @@ static void ksize_uaf(struct kunit *test)
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
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