Recently I found module list in Xposed become empty after I upgrade my Nexus5 to 6.0.1 (M4B30Z, Dec 2016). And all the modules are not activating. So I open logcat and see the following:
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01-10 21:35:02.682 294 294 E Xposed : Cannot load any modules because /data/data/de.robv.android.xposed.installer/conf/modules.list was not found |
Rovo89 said on a xda post that this file should be created if any module is activated. But somehow it didn’t do so on my Nexus5. So I create one myself and set correct permission (0644) and uid (you can run the Xposed Installer app and check the uid through ps |grep xposed). Then I reboot and check logcat again:
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01-10 21:29:39.485 295 295 E Xposed : Errors during Xposed initialization 01-10 21:29:39.485 295 295 E Xposed : java.io.IOException: Permission denied while reading /data/data/de.robv.android.xposed.installer/conf/modules.list |
Looks like it’s still not working.
Then I realise that Android started to set SELinux to enforce from Lollipop (5.0) so this should be the problem. (We can use dmesg|grep audit to check if the problem really related to SELinux. ) I compared a random file under /data/data to the file we just created:
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root@hammerhead:/ # ls -Z /data/data/de.robv.android.xposed.installer/cache/repo_cache.db -rw-rw---- u0_a379 u0_a379 u:object_r:app_data_file:s0:c512,c768 repo_cache.db root@hammerhead:/ # ls -Z /data/data/de.robv.android.xposed.installer/conf/modules.list -rw------- root root u:object_r:app_data_file:s0 modules.list |
So all we need to do is to change this conf/modules.list to u:object_r:app_data_file:s0:c512,c768 as well
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root@hammerhead:/ # restorecon /data/data/de.robv.android.xposed.installer/conf/modules.list |
restorecon is a applet shipped with toybox, we can also use chcon to manually set SELinux context.
升级Nexus5 到6.0.1 (M4B30Z, Dec 2016)之后，Xposed的模块列表变成空的了，所有的模块也都失效了。没有xposed，怎么种庄稼。于是我打开logcat看了一眼。
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01-10 21:35:02.682 294 294 E Xposed : Cannot load any modules because /data/data/de.robv.android.xposed.installer/conf/modules.list was not found |
rovo89在xda的QA帖中说一般情况下这个文件会在启用任意一个模块后创建。然而现在它并没有被创建。于是我去建了一个，然后chmod 644以及chown到应用到uid（可以通过启动应用之后ps|grep xposed查看uid，形如u0_a??），重启了一下，再瞄了一眼logcat。
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01-10 21:29:39.485 295 295 E Xposed : Errors during Xposed initialization 01-10 21:29:39.485 295 295 E Xposed : java.io.IOException: Permission denied while reading /data/data/de.robv.android.xposed.installer/conf/modules.list |
好像哪里不对
想起来Android从萝莉棒开始SELinux就是enforce了，所以大概是这个问题。（我们可以通过dmesg|grep audit来查看被SELinux过滤的各种奇怪操作。）于是看了一下默认的文件context和我们刚创建的文件的context：
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root@hammerhead:/ # ls -Z /data/data/de.robv.android.xposed.installer/cache/repo_cache.db -rw-rw---- u0_a379 u0_a379 u:object_r:app_data_file:s0:c512,c768 repo_cache.db root@hammerhead:/ # ls -Z /data/data/de.robv.android.xposed.installer/conf/modules.list -rw------- root root u:object_r:app_data_file:s0 modules.list |
那么我们把这个conf/modules.list也改成u:object_r:app_data_file:s0:c512,c768这个context好了
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root@hammerhead:/ # restorecon /data/data/de.robv.android.xposed.installer/conf/modules.list |
restorecon是toybox中带的一个applet，我们也可以用chcon来手动更改context。
自从有次过海关的时候电脑被TSA开包检查硬盘还掉下来了之后，我的被害妄想症就越来越没救了。
这篇文章假设有人可以物理接触你的电脑，以及你所在的网络不可信，这种情况下应该怎么保护你的服务器数据安全。
欢迎交流
因为怕死 遵纪守法，所以不在自家bt下新番和剧。目前的架构是这样的，造福一下海外党
试一下Let’s Encrypt
顺便前几天剁了Alpharacks的辣鸡vps，拿来做前端好了，听说国内效果ping不错（？
因为还有一堆微博图床上的图没法https，所以就不强行301了，你们看心情就好
