Commit dc742b01 authored by Yanteng Si's avatar Yanteng Si Committed by Jonathan Corbet
Browse files

docs/zh_CN: add vm page_table_check translation 



Translate .../vm/page_table_check.rst into Chinese.

Signed-off-by: default avatarYanteng Si <siyanteng@loongson.cn>
Reviewed-by: default avatarAlex Shi <alexs@kernel.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 7bdc0a95

Documentation/translations/zh_CN/vm/index.rst

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@@ -34,6 +34,7 @@ TODO:待引用文档集被翻译完毕后请及时修改此处） 
   overcommit-accounting

   page_frags

   page_owner

   page_table_check



TODOLIST:

* arch_pgtable_helpers
@@ -42,7 +43,6 @@ TODOLIST: 
* hugetlbfs_reserv

* numa

* page_migration

* page_table_check

* remap_file_pages

* slub

* split_page_table_lock

Documentation/translations/zh_CN/vm/page_table_check.rst

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.. SPDX-License-Identifier: GPL-2.0



:Original: Documentation/vm/page_table_check.rst



:翻译:



 司延腾 Yanteng Si <siyanteng@loongson.cn>



:校译:





========

页表检查

========



概述

====



页表检查允许通过确保防止某些类型的内存损坏来强化内核。



当新的页面可以从用户空间访问时，页表检查通过将它们的页表项（PTEs PMD等）添加到页表中来执行额外

的验证。



在检测到损坏的情况下，内核会被崩溃。页表检查有一个小的性能和内存开销。因此，它在默认情况下是禁用

的，但是在额外的加固超过性能成本的系统上，可以选择启用。另外，由于页表检查是同步的，它可以帮助调

试双映射内存损坏问题，在错误的映射发生时崩溃内核，而不是在内存损坏错误发生后内核崩溃。



双重映射检测逻辑

================



+-------------------+-------------------+-------------------+------------------+

| 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            |

+-------------------+-------------------+-------------------+------------------+



启用页表检查

============



用以下方法构建内核:



- PAGE_TABLE_CHECK=y

  注意，它只能在ARCH_SUPPORTS_PAGE_TABLE_CHECK可用的平台上启用。



- 使用 "page_table_check=on" 内核参数启动。



可以选择用PAGE_TABLE_CHECK_ENFORCED来构建内核，以便在没有额外的内核参数的情况下获得页表

支持。