Re: [PATCH linux-kselftest/test v1] apparmor: add AppArmor KUnit tests for policy unpack

[Kees Cook]

On Thu, Oct 17, 2019 at 05:33:56PM -0700, Iurii Zaikin wrote:
> On Thu, Oct 17, 2019 at 5:19 PM Brendan Higgins
> <brendanhiggins@xxxxxxxxxx> wrote:
> 
> > +config SECURITY_APPARMOR_TEST
> > +       bool "Build KUnit tests for policy_unpack.c"
> > +       default n

New options already already default n, this can be left off.

> > +       depends on KUNIT && SECURITY_APPARMOR
> > +       help
> >
> select SECURITY_APPARMOR ?

"select" doesn't enforce dependencies, so just a "depends ..." is
correct.

> > +       KUNIT_EXPECT_EQ(test, size, TEST_BLOB_DATA_SIZE);
> > +       KUNIT_EXPECT_TRUE(test,
> > +               memcmp(blob, TEST_BLOB_DATA, TEST_BLOB_DATA_SIZE) == 0);
> I think this must be  KUNIT_ASSERT_EQ(test, size, TEST_BLOB_DATA_SIZE);,
> otherwise there could be a buffer overflow in memcmp. All tests that
> follow such pattern

Agreed.

> are suspect. Also, not sure about your stylistic preference for
> KUNIT_EXPECT_TRUE(test,
>                memcmp(blob, TEST_BLOB_DATA, TEST_BLOB_DATA_SIZE) == 0);
> vs
> KUNIT_EXPECT_EQ(test,
>                0,
>                memcmp(blob, TEST_BLOB_DATA, TEST_BLOB_DATA_SIZE));

I like == 0.

-- 
Kees Cook