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.
升級Nexus5 到6.0.1 (M4B30Z, Dec 2016)之後，Xposed的模塊列表變成空的了，所有的模塊也都失效了。沒有xposed，怎麼種莊稼。於是我打開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帖中說一般情況下這個文件會在啟用任意一個模塊後創建。然而現在它並沒有被創建。於是我去建了一個，然後chmod 644以及chown到應用到uid（可以通過啟動應用之後ps|grep xposed查看uid，形如u0_a??），重啟了一下，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 |
好像哪裡不對
想起來Android從蘿莉棒開始SELinux就是enforce了，所以大概是這個問題。（我們可以通過dmesg|grep audit來查看被SELinux過濾的各種奇怪操作。）於是看了一下默認的文件context和我們剛創建的文件的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 |
那麼我們把這個conf/modules.list也改成u:object_r:app_data_file:s0:c512,c768這個context好了
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root@hammerhead:/ # restorecon /data/data/de.robv.android.xposed.installer/conf/modules.list |
restorecon是toybox中帶的一個applet，我們也可以用chcon來手動更改context。
自從有次過海關的時候電腦被TSA開包檢查硬碟還掉下來了之後，我的被害妄想症就越來越沒救了。
這篇文章假設有人可以物理接觸你的電腦，以及你所在的網路不可信，這種情況下應該怎麼保護你的伺服器數據安全。
歡迎交流
因為怕死 遵紀守法，所以不在自家bt下新番和劇。目前的架構是這樣的，造福一下海外黨
試一下Let’s Encrypt
順便前幾天剁了Alpharacks的辣雞vps，拿來做前端好了，聽說國內效果ping不錯（？
因為還有一堆微博圖床上的圖沒法https，所以就不強行301了，你們看心情就好
