linux-kernel - Re: [PATCH v3 1/2] kunit: test: Add vm

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Date: Sat, 22 Jun 2024 06:47:39 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Kees Cook <kees@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, David Gow <davidgow@...gle.com>,
	Vitor Massaru Iha <vitor@...saru.org>,
	Ivan Orlov <ivan.orlov0322@...il.com>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	Rae Moar <rmoar@...gle.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 1/2] kunit: test: Add vm_mmap() allocation resource
 manager

Hi,

On Wed, Jun 12, 2024 at 12:59:18PM -0700, Kees Cook wrote:
> For tests that need to allocate using vm_mmap() (e.g. usercopy and
> execve), provide the interface to have the allocation tracked by KUnit
> itself. This requires bringing up a placeholder userspace mm.
> 
> This combines my earlier attempt at this with Mark Rutland's version[1].
> 
> Normally alloc_mm() and arch_pick_mmap_layout() aren't exported for
> modules, so export these only for KUnit testing.
> 
> Link: https://lore.kernel.org/lkml/20230321122514.1743889-2-mark.rutland@arm.com/ [1]

FWIW, not sure I understand what the above link has to do with this patch.

> Co-developed-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Reviewed-by: David Gow <davidgow@...gle.com>
> Signed-off-by: Kees Cook <kees@...nel.org>

This patch results in a build failure for nommu_kc705_defconfig if kunit tests
are also enabled.

ERROR: modpost: vmlinux: local symbol 'arch_pick_mmap_layout' was exported

If CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT=n, CONFIG_MMU=n, and
CONFIG_KUNIT=y, arch_pick_mmap_layout is exported. However, if
CONFIG_MMU=n, it is declared as static inline function.

Guenter

---
bisect log:

# bad: [b992b79ca8bc336fa8e2c80990b5af80ed8f36fd] Add linux-next specific files for 20240620
# good: [6ba59ff4227927d3a8530fc2973b80e94b54d58f] Linux 6.10-rc4
git bisect start 'HEAD' 'v6.10-rc4'
# good: [c02e717c5a89654b244fec58bb5cda32770966b5] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
git bisect good c02e717c5a89654b244fec58bb5cda32770966b5
# good: [29e7d78253b7ebf4b76fcf6d95e227d0b0c57dc0] Merge branch 'msm-next' of https://gitlab.freedesktop.org/drm/msm.git
git bisect good 29e7d78253b7ebf4b76fcf6d95e227d0b0c57dc0
# good: [bf8fd0d956bfcbf4fd6ff063366374c4bf87d806] Merge branch 'non-rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
git bisect good bf8fd0d956bfcbf4fd6ff063366374c4bf87d806
# good: [1110f16317b1e0742521eaef5613eb1eb17f55ca] Merge branch 'icc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc.git
git bisect good 1110f16317b1e0742521eaef5613eb1eb17f55ca
# good: [63f3716198e5644713748d83e6a6df3b4a6a3b10] Merge branch 'gpio/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
git bisect good 63f3716198e5644713748d83e6a6df3b4a6a3b10
# bad: [91b48d9adafddb242264ba19c0bae6e23f71b18a] Merge branch 'kunit' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git
git bisect bad 91b48d9adafddb242264ba19c0bae6e23f71b18a
# good: [9b401f4a7170125365160c9af267a41ff6b39001] pinctrl: ti: ti-iodelay: fix possible memory leak when pinctrl_enable() fails
git bisect good 9b401f4a7170125365160c9af267a41ff6b39001
# good: [1963f932d368f18185466979cc0bc89414d798e7] Merge branch 'pwm/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git
git bisect good 1963f932d368f18185466979cc0bc89414d798e7
# good: [f91869accbe23a2bb08712b7262fa61eab716d42] selftests/resctrl: Simplify bandwidth report type handling
git bisect good f91869accbe23a2bb08712b7262fa61eab716d42
# good: [cbf284291604e818424f45dbdf6a8a705b5480ad] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git
git bisect good cbf284291604e818424f45dbdf6a8a705b5480ad
# good: [a5217468214c228b89da37291de604cd756914ab] kunit: add missing MODULE_DESCRIPTION() macros to core modules
git bisect good a5217468214c228b89da37291de604cd756914ab
# bad: [51104c19d8570eb23208e08eac0e9ae09ced1c15] kunit: test: Add vm_mmap() allocation resource manager
git bisect bad 51104c19d8570eb23208e08eac0e9ae09ced1c15
# good: [425ae3ab5a1fa744a00680f059cf1accaaaecb28] list: test: add the missing MODULE_DESCRIPTION() macro
git bisect good 425ae3ab5a1fa744a00680f059cf1accaaaecb28
# first bad commit: [51104c19d8570eb23208e08eac0e9ae09ced1c15] kunit: test: Add vm_mmap() allocation resource manager