[PATCH v4 0/3] kasan: migrate the last module test to kunit

[Sabyrzhan Tasbolatov <snovitoll@gmail.com>]

copy_user_test() is the last KUnit-incompatible test with
CONFIG_KASAN_MODULE_TEST requirement, which we are going to migrate to KUnit
framework and delete the former test and Kconfig as well.

In this patch series:

	- [1/3] move kasan_check_write() and check_object_size() to
		do_strncpy_from_user() to cover with KASAN checks with
		multiple conditions	in strncpy_from_user().

	- [2/3] migrated copy_user_test() to KUnit, where we can also test
		strncpy_from_user() due to [1/4].

		KUnits have been tested on:
		- x86_64 with CONFIG_KASAN_GENERIC. Passed
		- arm64 with CONFIG_KASAN_SW_TAGS. 1 fail. See [1]
		- arm64 with CONFIG_KASAN_HW_TAGS. 1 fail. See [1]
		[1] https://lore.kernel.org/linux-mm/CACzwLxj21h7nCcS2-KA_q7ybe+5pxH0uCDwu64q_9pPsydneWQ@mail.gmail.com/

	- [3/3] delete CONFIG_KASAN_MODULE_TEST and documentation occurrences.

Changes v3 -> v4:
- moved checks from do_strncpy_from_user to strncpy_from_user
  due to "call to __check_object_size() with UACCESS enabled" warning,
  during the kernel build.

Changes v2 -> v3:
- added in [1/3] Reviewed-by: Andrey Konovalov.
- added a long string in usermem for strncpy_from_user. Suggested by Andrey.
- applied Andrey's patch to modify further kasan.rst.

Changes v1 -> v2:
- moved the sanitization to do_strncpy_from_user and as the separate commit
per Andrey's review.
- deleted corresponding entries of kasan_test_module.o in Makefile
- deleted CONFIG_KASAN_MODULE_TEST at all with the documentation in separate
  commit.
- added Documentation maintainers in CC.

Sabyrzhan Tasbolatov (3):
  kasan: move checks to do_strncpy_from_user
  kasan: migrate copy_user_test to kunit
  kasan: delete CONFIG_KASAN_MODULE_TEST

 Documentation/dev-tools/kasan.rst             |  9 +--
 .../translations/zh_CN/dev-tools/kasan.rst    |  6 +-
 .../translations/zh_TW/dev-tools/kasan.rst    |  6 +-
 lib/Kconfig.kasan                             |  7 --
 lib/strncpy_from_user.c                       |  5 +-
 mm/kasan/Makefile                             |  2 -
 mm/kasan/kasan.h                              |  2 +-
 mm/kasan/kasan_test_c.c                       | 39 +++++++++
 mm/kasan/kasan_test_module.c                  | 81 -------------------
 mm/kasan/report.c                             |  2 +-
 10 files changed, 48 insertions(+), 111 deletions(-)
 delete mode 100644 mm/kasan/kasan_test_module.c

-- 
2.34.1