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[程序员] Linux内核模块化不经常用的功能?

  • 2026-07-02 16:33:11
[程序员] Linux内核模块化不经常用的功能?
前些天出了内核的一个漏洞，可以被用来本地提权限，相关的功能是内核实现的加解密接口algif_aead，然后网给上有的缓解步骤里说，只要将这个相关的模块禁止掉就好了。
但是RHEL的配置选项里这个模块是直接编译到内核binary里的，不是一个独立的kernel-module，虽然公司的产品不使用这个功能，但是默认的二进制Linux kernel image里有这个功能。所以不能使用kernel module的规则功能来限制，这可怎么办？怎么临时解决这个问题？前提是要升级系统需要花费一些时间。
然后问ChatGPT/知乎直答，给出了几个方法，可通过livepatch、eBPF拦截或systemtap钩子三种无需重启的方式阻断漏洞函数调用，以下是具体实现和对比
使用eBPF的功能，利用eBPF的kprobe钩子，在漏洞函数入口强制返回错误，阻断恶意调用。前提是需安装bcc工具链（RHEL可通过EPEL源安装）。
使用ftrace/systemtap的功能在刚进入函数的时候，添加判断逻辑，提前做规避漏洞。
还有livepatch的功能。Livepatch是Linux内核官方支持的动态补丁技术，无需重启即可修复漏洞，RHEL 7+通过kpatch工具支持。
写在最后：其实还是应该安按照模块分开的方式，低耦合，可以方便隔离有问题的代码。尤其是对那些不经常使用的模块。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  1. CONNECT:[ UseTime:0.000811s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001197s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.017750s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006118s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001173s ]
  6. SELECT * FROM `set` [ RunTime:0.008508s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001181s ]
  8. SELECT * FROM `article` WHERE `id` = 495639 LIMIT 1 [ RunTime:0.006376s ]
  9. UPDATE `article` SET `lasttime` = 1783047692 WHERE `id` = 495639 [ RunTime:0.003183s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000559s ]
  11. SELECT * FROM `article` WHERE `id` < 495639 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001004s ]
  12. SELECT * FROM `article` WHERE `id` > 495639 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000951s ]
  13. SELECT * FROM `article` WHERE `id` < 495639 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009086s ]
  14. SELECT * FROM `article` WHERE `id` < 495639 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002725s ]
  15. SELECT * FROM `article` WHERE `id` < 495639 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.263035s ]
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