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-.. SPDX-License-Identifier: GPL-2.0
-
-.. _page_table_check:
-
-================
-Page Table Check
-================
-
-Introduction
-============
-
-Page table check allows to harden the kernel by ensuring that some types of
-the memory corruptions are prevented.
-
-Page table check performs extra verifications at the time when new pages become
-accessible from the userspace by getting their page table entries (PTEs PMDs
-etc.) added into the table.
-
-In case of detected corruption, the kernel is crashed. There is a small
-performance and memory overhead associated with the page table check. Therefore,
-it is disabled by default, but can be optionally enabled on systems where the
-extra hardening outweighs the performance costs. Also, because page table check
-is synchronous, it can help with debugging double map memory corruption issues,
-by crashing kernel at the time wrong mapping occurs instead of later which is
-often the case with memory corruptions bugs.
-
-Double mapping detection logic
-==============================
-
-+-------------------+-------------------+-------------------+------------------+
-| Current Mapping   | New mapping       | Permissions       | Rule             |
-+===================+===================+===================+==================+
-| Anonymous         | Anonymous         | Read              | Allow            |
-+-------------------+-------------------+-------------------+------------------+
-| Anonymous         | Anonymous         | Read / Write      | Prohibit         |
-+-------------------+-------------------+-------------------+------------------+
-| Anonymous         | Named             | Any               | Prohibit         |
-+-------------------+-------------------+-------------------+------------------+
-| Named             | Anonymous         | Any               | Prohibit         |
-+-------------------+-------------------+-------------------+------------------+
-| Named             | Named             | Any               | Allow            |
-+-------------------+-------------------+-------------------+------------------+
-
-Enabling Page Table Check
-=========================
-
-Build kernel with:
-
-- PAGE_TABLE_CHECK=y
-  Note, it can only be enabled on platforms where ARCH_SUPPORTS_PAGE_TABLE_CHECK
-  is available.
-
-- Boot with 'page_table_check=on' kernel parameter.
-
-Optionally, build kernel with PAGE_TABLE_CHECK_ENFORCED in order to have page
-table support without extra kernel parameter.