Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 28 Jan 2022 14:48:01 +1100
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Andrey Konovalov <andreyknvl@gmail.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: linux-next: build failure after merge of the akpm-current tree
Message-ID: <20220128144801.73f5ced0@canb.auug.org.au>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="Sig_/9N2ajg9p+xO9PjwewIRTh1P";
 protocol="application/pgp-signature"; micalg=pgp-sha256
Precedence: bulk

--Sig_/9N2ajg9p+xO9PjwewIRTh1P
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

Hi all,

After merging the akpm-current tree, today's linux-next build (x86_64
allmodconfig) failed like this:

lib/test_kasan.c: In function 'vmalloc_oob':
lib/test_kasan.c:1113:71: error: array subscript 2035 is outside array boun=
ds of 'char[2035]' [-Werror=3Darray-bounds]
 1113 |                 KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_p=
tr)[size]);
      |                                               ~~~~~~~~~~~~~~~~~~~~~=
~~~^~~~~~
lib/test_kasan.c:96:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_FAI=
L'
   96 |         expression;                                                =
     \
      |         ^~~~~~~~~~
lib/test_kasan.c:1096:17: note: referencing an object of size 2035 allocate=
d by 'vmalloc'
 1096 |         v_ptr =3D vmalloc(size);
      |                 ^~~~~~~~~~~~~
lib/test_kasan.c:1116:63: error: array subscript 2040 is outside array boun=
ds of 'char[2035]' [-Werror=3Darray-bounds]
 1116 |         KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size=
 + 5]);
      |                                       ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~=
~~~~~
lib/test_kasan.c:96:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_FAI=
L'
   96 |         expression;                                                =
     \
      |         ^~~~~~~~~~
lib/test_kasan.c:1096:17: note: referencing an object of size 2035 allocate=
d by 'vmalloc'
 1096 |         v_ptr =3D vmalloc(size);
      |                 ^~~~~~~~~~~~~

Caused by commit

  96304a5b9bff ("kasan: improve vmalloc tests")

interacting with commit

  d4e0dad4a0cd ("Makefile: Enable -Warray-bounds")

from the kspp tree.

Since the KASAN tests are doing this deliberately, I added the below
hack for today.  Is there something better?

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 28 Jan 2022 14:40:24 +1100
Subject: [PATCH] similar to "kasan: test: fix compatibility with
 FORTIFY_SOURCE"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 lib/test_kasan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 9dd767d05235..c07132c857e7 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -1096,6 +1096,8 @@ static void vmalloc_oob(struct kunit *test)
 	v_ptr =3D vmalloc(size);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
=20
+	OPTIMIZER_HIDE_VAR(v_ptr);
+
 	/*
 	 * We have to be careful not to hit the guard page in vmalloc tests.
 	 * The MMU will catch that and crash us.
--=20
2.34.1

--=20
Cheers,
Stephen Rothwell

--Sig_/9N2ajg9p+xO9PjwewIRTh1P
Content-Type: application/pgp-signature
Content-Description: OpenPGP digital signature

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCAAdFiEENIC96giZ81tWdLgKAVBC80lX0GwFAmHzZ3EACgkQAVBC80lX
0GwiFAf8Cw3msbJoB/WvX4sibiLqoUZJij/zXTPkG1uD09OVwluM1vHo3sbSLBsw
nDfjiOOi/oOeDaOSknjlFtdo+QkYw1pU4sNj8rlICeiawjg3zoLMT2WnDxRfDV6w
H+1w9FXKe9stgezcoC/ckgEG9ntjC6z09m1qISUwWV+IV+49B+KE92hGwIGq1NfN
jeaIe2JIP0J/glgs7Io+gab8dygmGvSR4QRZKjqaUw83nHJKs3OFfOtLjGTgrWAW
+bAysnh5EhvKi68Og/igHrc5TDiJ9WX7w47u1nUTzr8JjKqQoDhaEF5p3rKzRgd6
+MKbsNj77AuvfqCW/1U5lGI++9bD5w==
=F6zI
-----END PGP SIGNATURE-----

--Sig_/9N2ajg9p+xO9PjwewIRTh1P--