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From: Kees Cook <keescook@chromium.org>
To: Iurii Zaikin <yzaikin@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>,
	shuah <shuah@kernel.org>,
	john.johansen@canonical.com, jmorris@namei.org, serge@hallyn.com,
	alan.maguire@oracle.com, davidgow@google.com,
	Luis Chamberlain <mcgrof@kernel.org>,
	Theodore Ts'o <tytso@mit.edu>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-security-module@vger.kernel.org,
	KUnit Development <kunit-dev@googlegroups.com>,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>,
	Mike Salvatore <mike.salvatore@canonical.com>
Subject: Re: [PATCH linux-kselftest/test v1] apparmor: add AppArmor KUnit tests for policy unpack
Date: Wed, 30 Oct 2019 11:59:00 -0700	[thread overview]
Message-ID: <201910301157.58D0CE4D3@keescook> (raw)
In-Reply-To: <CAAXuY3rLEt9nqOBSNaWjLMHNg6pDHdjtg7hFiYx-KCDhyfnkcg@mail.gmail.com>

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@google.com> 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

  reply	other threads:[~2019-10-30 18:59 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-18  0:18 Brendan Higgins
2019-10-18  0:33 ` Iurii Zaikin
2019-10-30 18:59   ` Kees Cook [this message]
2019-11-06  0:35     ` Brendan Higgins
2019-11-06  0:37       ` Brendan Higgins
2019-10-18  0:43 ` Brendan Higgins
2019-10-18 16:25   ` Theodore Y. Ts'o
2019-10-18 21:41     ` Brendan Higgins
2019-10-30 19:02       ` Kees Cook
2019-10-31  9:01         ` Brendan Higgins
2019-10-18 12:29 ` Luis Chamberlain
2019-10-19 12:56   ` Alan Maguire
2019-10-19 18:36     ` Luis Chamberlain
2019-10-24  0:42     ` Brendan Higgins
2019-10-24 10:15       ` Luis Chamberlain
2019-10-30 19:09         ` Kees Cook
2019-10-30 20:11           ` Iurii Zaikin
2019-10-31  1:40             ` John Johansen
2019-10-31  9:33             ` Brendan Higgins
2019-10-31 18:40               ` Kees Cook
2019-11-05 16:43               ` Mike Salvatore
2019-11-05 23:59                 ` Brendan Higgins
2019-10-31  1:37           ` John Johansen
2019-10-31  9:17           ` Brendan Higgins
2019-11-01 12:30             ` Alan Maguire
2019-11-05 23:44               ` Brendan Higgins

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