linux-kernel - [PATCH 5/6] docs/zh_CN: update the translation of mm/page_table

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Message-ID: <68b62a5713d5a465f09226c1a607dee7ec76a6aa.1729327831.git.dzm91@hust.edu.cn>
Date: Sat, 19 Oct 2024 16:54:55 +0800
From: Dongliang Mu <dzm91@...t.edu.cn>
To: si.yanteng@...ux.dev,
	alexs@...nel.org,
	corbet@....net,
	Yanteng Si <siyanteng@...ngson.cn>,
	Dongliang Mu <dzm91@...t.edu.cn>
Cc: hust-os-kernel-patches@...glegroups.com,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] docs/zh_CN: update the translation of mm/page_table_check.rst

Update to commit 8430557fc584 ("mm/page_table_check: support
userfault wr-protect entries")

scripts/checktransupdate.py reports:

Documentation/translations/zh_CN/mm/page_table_check.rst
commit 8430557fc584 ("mm/page_table_check: support userfault wr-protect
entries")
commit 81a31a860bb6 ("mm: page_table_check: Make it dependent on
EXCLUSIVE_SYSTEM_RAM")
commit ee86588960e2 ("docs/mm: remove useless markup")
3 commits needs resolving in total

Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 .../translations/zh_CN/mm/page_table_check.rst      | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/translations/zh_CN/mm/page_table_check.rst b/Documentation/translations/zh_CN/mm/page_table_check.rst
index e8077310a76c..dc34570dceff 100644
--- a/Documentation/translations/zh_CN/mm/page_table_check.rst
+++ b/Documentation/translations/zh_CN/mm/page_table_check.rst
@@ -54,3 +54,16 @@
 
 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。
+
+实现注意事项
+============
+
+我们特意决定不使用 VMA 信息，以避免依赖于 MM 状态（除了有限的 “struct page” 信息）。页表检查
+独立于 Linux-MM 状态机，它验证用户可访问的页面不会被错误地共享。
+
+PAGE_TABLE_CHECK 依赖于 EXCLUSIVE_SYSTEM_RAM。原因在于，若没有 EXCLUSIVE_SYSTEM_RAM，
+用户被允许通过 /dev/mem 将任意物理内存区域映射到用户空间。同时，页面可能在映射到用户空间期间
+改变自己的属性（例如，从匿名页面变为命名页面），导致页表检查检测到“损坏”。
+
+即使有 EXCLUSIVE_SYSTEM_RAM，I/O 页面可能仍然被允许通过 /dev/mem 映射。然而，这些页面始终
+被视为命名页面，所以它们不会破坏页表检查中使用的逻辑。
-- 
2.43.0