Fix: 单个用户的并发会话限制，修改su命令

[luojiahao11]

由于pam_limits库通过读取 var/run/utmp 文件进行判断并发会话数量，而使用su命令登录后 utmp 文件并没有更新，故添加更新逻辑

Summary by Sourcery

Enable utmp writing for su sessions to enforce per-user concurrent session limits via pam_limits, and add corresponding Debian packaging patch.

Bug Fixes:

• Enforce concurrent session limits for su by ensuring utmp entries are written

Build:

• Add Debian patch to enable utmp writing in su sessions

[sourcery-ai]

Reviewer's Guide

This PR updates the Debian login UTMP‐writing patch to ensure that su sessions correctly update /var/run/utmp, so that pam_limits can accurately count concurrent sessions.

File-Level Changes

Change	Details	Files
Enable UTMP updates for su sessions	Removed guard preventing UTMP writes during su invocations Inserted calls to login_tty()/utmp update functions immediately after successful user switch Updated patch metadata to include the new su‐specific UTMP logic	debian/patches/debian/login-turn-on-utmp-writing.patch

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[sourcery-ai]

Hey @luojiahao11 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[aaronUniontech]

+1

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aaronUniontech
Once this PR has been reviewed and has the lgtm label, please assign zeno-sole for approval. For more information see the Code Review Process.

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[github-actions]

TAG Bot

TAG: 2.40.4-3deepin6
EXISTED: no
DISTRIBUTION: unstable

[deepin-ci-robot]

@luojiahao11: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
github-trigger-obs-ci	2746e36	link	true	/test github-trigger-obs-ci

Full PR test history. Your PR dashboard.

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