kasan: move checks to do_strncpy_from_user

Patch series "kasan: migrate the last module test to kunit", v4.

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.


This patch (of 3):

Since in the commit 2865baf54077("x86: support user address masking
instead of non-speculative conditional") do_strncpy_from_user() is called
from multiple places, we should sanitize the kernel *dst memory and size
which were done in strncpy_from_user() previously.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 2865baf54077 ("x86: support user address masking instead of non-speculative conditional")
Signed-off-by: Sabyrzhan Tasbolatov <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Alex Shi <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Hu Haowen <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Cc: Yanteng Si <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions