linux-hardening - [PATCH v2 0/5] kunit: build kunit tests without structleak plugin

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Date:   Wed, 29 Sep 2021 14:27:08 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     shuah@...nel.org, davidgow@...gle.com, arnd@...db.de,
        keescook@...omium.org, rafael@...nel.org, jic23@...nel.org,
        lars@...afoo.de, ulf.hansson@...aro.org, andreas.noever@...il.com,
        michael.jamet@...el.com, mika.westerberg@...ux.intel.com,
        YehezkelShB@...il.com, masahiroy@...nel.org,
        michal.lkml@...kovi.net, ndesaulniers@...gle.com
Cc:     linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        gregkh@...uxfoundation.org, linux-iio@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Brendan Higgins <brendanhiggins@...gle.com>
Subject: [PATCH v2 0/5] kunit: build kunit tests without structleak plugin

The structleak plugin causes the stack frame size to grow immensely when
used with KUnit; this is caused because KUnit allocates lots of
moderately sized structs on the stack as part of its assertion macro
implementation. For most tests with small to moderately sized tests
cases there are never enough KUnit assertions to be an issue at all;
even when a single test cases has many KUnit assertions, the compiler
should never put all these struct allocations on the stack at the same
time since the scope of the structs is so limited; however, the
structleak plugin does not seem to respect the compiler doing the right
thing and will still warn of excessive stack size in some cases.

These patches are not a permanent solution since new tests can be added
with huge test cases, but this serves as a stop gap to stop structleak
from being used on KUnit tests which will currently result in excessive
stack size.

Please see the discussion thread here[1] for more context.

Changes since last revision:
 - Dropped mmc: sdhci-of-aspeed patch since it was not a pure test and I
   could not reproduce the stack size warning anyway.
 - Removed Wframe-larger-than=10240 warning from the bitfield kunit
   test.
 - All other patches are the same except with updated
   reviewers/contributor commit footers.

[1] https://lore.kernel.org/linux-arm-kernel/CAFd5g44udqkDiYBWh+VeDVJ=ELXeoXwunjv0f9frEN6HJODZng@mail.gmail.com/

Arnd Bergmann (1):
  bitfield: build kunit tests without structleak plugin

Brendan Higgins (4):
  gcc-plugins/structleak: add makefile var for disabling structleak
  iio/test-format: build kunit tests without structleak plugin
  device property: build kunit tests without structleak plugin
  thunderbolt: build kunit tests without structleak plugin

 drivers/base/test/Makefile   | 2 +-
 drivers/iio/test/Makefile    | 1 +
 drivers/thunderbolt/Makefile | 1 +
 lib/Makefile                 | 2 +-
 scripts/Makefile.gcc-plugins | 4 ++++
 5 files changed, 8 insertions(+), 2 deletions(-)

base-commit: 02d5e016800d082058b3d3b7c3ede136cdc6ddcb
-- 
2.33.0.685.g46640cef36-goog