Java Android：权限被拒绝 /data/local/tmp/*
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Android: Permission denied for /data/local/tmp/*
提问by Harsh Chhatwani
I am trying to run a shell script through an android app. The script has a command which just runs a jar on the device. When I run this command directly on the shell using adb, everything works fine. But when I run it through the script using the android app, I get a permission denied exception (open failed: EACCES (Permission denied)) for the files created in /data/local/tmp folder. Can anyone guide in how to resolve this issue?
我正在尝试通过 android 应用程序运行 shell 脚本。该脚本有一个命令，它只在设备上运行一个 jar。当我使用 adb 在 shell 上直接运行此命令时，一切正常。但是，当我使用 android 应用程序通过脚本运行它时，我收到 /data/local/tmp 文件夹中创建的文件的权限被拒绝异常（打开失败：EACCES（权限被拒绝））。任何人都可以指导如何解决这个问题？
This is what my manifest looks like
这就是我的清单的样子
<manifest ….>
<uses-sdk …>
<uses-permission… .>
…
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
…
<application …>
…
</application>
</manifest>
Thanks.
谢谢。
回答by u3458921
I think the reason is that your Andorid is not been rooted. the "/data" have the root Permission. So root your phone first, and give your app the permission. you can try command:"su" int the shell change to root.
我认为原因是你的Andorid没有被root。“/data”具有根权限。所以先root你的手机，然后给你的应用程序权限。您可以尝试 command:"su" 将 shell 更改为 root。
回答by Alex Cohn
If I understand the scenario correctly, you create the script on the fly, and use /data/local/tmpas an easy location that is both publicly writable and executable. Once, this was possible. But on recent versions of Android, security has been tightened.
如果我正确理解了场景，您可以即时创建脚本，并将其/data/local/tmp用作可公开写入和可执行的简单位置。曾经，这是可能的。但在最新版本的 Android 上，安全性已得到加强。
Your app can execute files under /data/data/${your.package}. You can use getContext().getFilesDir()to reliably obtain the full path. Note that you still need to use chmod 500to ensure that the file has executablepermission.
您的应用程序可以执行/data/data/${your.package}. 您可以使用getContext().getFilesDir()可靠地获取完整路径。请注意，您仍然需要使用chmod 500以确保该文件具有可执行权限。
If you have some fixed executables (binaries or scripts) that must be installed with your app, there is a clever trick to let the system package installer take care of all that for you: make sure the file has a name "libsomething.so" and put it in /libs/armeabidirectory under the Eclipse project root. After installation, the files will be present in getContext().getApplicationInfo().nativeLibraryDirdirectory with executable permissions set.
如果您有一些固定的可执行文件（二进制文件或脚本）必须与您的应用程序一起安装，那么有一个聪明的技巧可以让系统包安装程序为您处理所有这些：确保文件具有名称“ libsomething .so”"并将其放在/libs/armeabiEclipse 项目根目录下。安装后，这些文件将出现在getContext().getApplicationInfo().nativeLibraryDir目录中，并设置了可执行权限。
PSYou don't need the WRITE_EXTERNAL_STORAGEpermission for this to work (maybe you need it for other things your app does).
PS您不需要WRITE_EXTERNAL_STORAGE权限即可使其工作（也许您的应用程序执行其他操作需要它）。
PPSYou can run a shell script from anywhere, including /sdcard, and you don't need executable permission for the script. Instead, use sh -c source full.path.to.script.
PPS您可以从任何地方运行 shell 脚本，包括/sdcard，并且您不需要脚本的可执行权限。相反，使用sh -c source full.path.to.script.
回答by deven miles
You can use the adb interface to copy and/or push files to the /data/local/tmpfolder but if you want to use/see them in the terminal app you will need to (in adb interface) first
您可以使用 adb 界面将文件复制和/或推送到/data/local/tmp文件夹，但如果您想在终端应用程序中使用/查看它们，您需要先（在 adb 界面中）
cd /data/local/tmp
then make a folder inside the folder. Example
然后在文件夹内创建一个文件夹。例子
mkdir folder
next change the permissions
接下来更改权限
chmod - R 777 folder
Now you have a folder you can read and write to.
现在您有了一个可以读写的文件夹。
A few things that I would like to know is how to make the system think that the subinary is in the /system/binfolder (without copying) because I can only get tmp... root access because even with root access, I can not remount the system directory as rwbecause the zte-paragon has its system partition formatted as a read-only file-system
我想知道的一些事情是如何让系统认为su二进制/system/bin文件在文件夹中（无需复制），因为我只能获得 tmp...root 访问权限，因为即使有 root 访问权限，我也无法重新安装系统目录，rw因为 zte-paragon 将其系统分区格式化为只读文件系统
回答by szym
Make sure the /data/local/tmplocation is world-executable on your device:
确保该/data/local/tmp位置在您的设备上是全局可执行的：
adb shell ls -ld /data/ /data/local/ /data/local/tmp/
drwxrwx--x system system XXXX-XX-XX XX:XX
drwxr-x--x root root XXXX-XX-XX XX:XX
drwxrwx--x shell shell XXXX-XX-XX XX:XX
# ^ all x here == OK!
If it's not, there's nothing you can do, and you need to use the standard storage (internal /data/data/{package}or external /sdcard/).
如果不是，则您无能为力，您需要使用标准存储（内部/data/data/{package}或外部/sdcard/）。
Make sure you made the file world-readable.
确保您使文件世界可读。
adb shell chmod o+r /data/local/tmp/myfile.txt
You don't need any permissions.
您不需要任何权限。
