lkdtm: Add REPORT_STACK for checking stack offsets

mainline inclusion
from mainline-v5.13-rc1
commit 68ef8735
category: featrue
bugzilla: https://gitee.com/openeuler/kernel/issues/I5YQ6Z
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=68ef8735d253f3d840082b78f996bf2d89ee6e5f



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For validating the stack offset behavior, report the offset from a given
process's first seen stack address. Add s script to calculate the results
to the LKDTM kselftests.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210401232347.2791257-7-keescook@chromium.org


Signed-off-by: Yi Yang <yiyang13@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: GONG Ruiqi <gongruiqi1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>