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kunit/overflow: Adjust for __counted_by with DEFINE_RAW_FLEX()

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When a flexible array structure has a __counted_by annotation, its use
with DEFINE_RAW_FLEX() will result in the count being zero-initialized.
This is expected since one doesn't want to use RAW with a counted_by
struct. Adjust the tests to check for the condition and for compiler
support.

Reported-by: Christian Schrefl <chrisi.schrefl@gmail.com>
Closes: https://lore.kernel.org/all/0bfc6b38-8bc5-4971-b6fb-dc642a73fbfe@gmail.com/
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20240610182301.work.272-kees@kernel.org
Tested-by: Christian Schrefl <chrisi.schrefl@gmail.com>
Reviewed-by: Christian Schrefl <chrisi.schrefl@gmail.com>
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2024-06-10 11:23:05 -07:00
parent f7d3b1ffc6
commit 9dd5134c61
1 changed files with 17 additions and 3 deletions
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20
lib/overflow_kunit.c
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@ -1178,14 +1178,28 @@ struct foo {
s16 array[] __counted_by(counter);
};
struct bar {
int a;
u32 counter;
s16 array[];
};
static void DEFINE_FLEX_test(struct kunit *test)
{
DEFINE_RAW_FLEX(struct foo, two, array, 2);
/* Using _RAW_ on a __counted_by struct will initialize "counter" to zero */
DEFINE_RAW_FLEX(struct foo, two_but_zero, array, 2);
#if __has_attribute(__counted_by__)
int expected_raw_size = sizeof(struct foo);
#else
int expected_raw_size = sizeof(struct foo) + 2 * sizeof(s16);
#endif
/* Without annotation, it will always be on-stack size. */
DEFINE_RAW_FLEX(struct bar, two, array, 2);
DEFINE_FLEX(struct foo, eight, array, counter, 8);
DEFINE_FLEX(struct foo, empty, array, counter, 0);
KUNIT_EXPECT_EQ(test, __struct_size(two),
sizeof(struct foo) + sizeof(s16) + sizeof(s16));
KUNIT_EXPECT_EQ(test, __struct_size(two_but_zero), expected_raw_size);
KUNIT_EXPECT_EQ(test, __struct_size(two), sizeof(struct bar) + 2 * sizeof(s16));
KUNIT_EXPECT_EQ(test, __struct_size(eight), 24);
KUNIT_EXPECT_EQ(test, __struct_size(empty), sizeof(struct foo));
}