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From: Arnd Bergmann <arnd@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
	Brendan Higgins <brendanhiggins@google.com>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Alan Maguire <alan.maguire@oracle.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Vitor Massaru Iha <vitor@massaru.org>,
	linux-hardening@vger.kernel.org, linux-kselftest@vger.kernel.org,
	kunit-dev@googlegroups.com
Subject: [RFC 0/3] kunit vs structleak
Date: Mon, 25 Jan 2021 13:45:25 +0100
Message-ID: <20210125124533.101339-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

I ran into a couple of problems with kunit tests taking too much stack
space, sometimes dangerously so. These the the three instances that
cause an increase over the warning limit of some architectures:

lib/bitfield_kunit.c:93:1: error: the frame size of 7440 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/base/test/property-entry-test.c:481:1: error: the frame size of 2640 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/thunderbolt/test.c:1529:1: error: the frame size of 1176 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

Ideally there should be a way to rewrite the kunit infrastructure
that avoids the explosion of stack data when the structleak plugin
is used.

A rather drastic measure would be to use Kconfig logic to make
the two options mutually exclusive. This would clearly work, but
is probably not needed.

As a simpler workaround, this disables the plugin for the three
files in which the excessive stack usage was observed.

      Arnd

Arnd Bergmann (3):
  bitfield: build kunit tests without structleak plugin
  drivers/base: build kunit tests without structleak plugin
  thunderbolt: build kunit tests without structleak plugin

 drivers/base/test/Makefile   | 1 +
 drivers/thunderbolt/Makefile | 1 +
 lib/Makefile                 | 1 +
 3 files changed, 3 insertions(+)

Cc: Kees Cook <keescook@chromium.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Alan Maguire <alan.maguire@oracle.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Vitor Massaru Iha <vitor@massaru.org>
Cc: linux-hardening@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Cc: kunit-dev@googlegroups.com
Cc: linux-kernel@vger.kernel.org
-- 
2.29.2


             reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 12:45 Arnd Bergmann [this message]
2021-01-25 12:45 ` [RFC 1/3] bitfield: build kunit tests without structleak plugin Arnd Bergmann
2021-01-25 12:45 ` [RFC 2/3] drivers/base: " Arnd Bergmann
2021-01-25 12:45 ` [RFC 3/3] thunderbolt: " Arnd Bergmann
2021-01-27 12:53   ` Mika Westerberg
2021-01-27 20:15 ` [RFC 0/3] kunit vs structleak Kees Cook
2021-01-29 21:29   ` Brendan Higgins

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