Each Android package (.apk) file installed on the device is given its own unique Linux user ID and any files created by that application will be assigned its user ID which is not normally accessible to other packages
You can refer to below link: http://code.google.com/intl/zh-CN/android/devel/security.html On Wed, Dec 24, 2008 at 4:58 PM, rktb <[email protected]> wrote: > > Hi, > > Need some pointers about file access permissions: > > Here is what I have tried: > > From the Java app., I can create a file in /data/data/ > <my_package_name>/files/ using the API openFileOutput(). The > permissions of the file is as follows: > -rw-rw---- app_10 app_10 0 2008-12-23 09:17 testFile1.txt > > The files folder itself has the permissions: > drwxrwx--x app_10 app_10 2008-12-23 09:17 files > > When I create a file using native code on /sdcard, the permissions are > as follows: > ----rw-rw- system system 0 2008-12-23 09:17 > fromNativeCode.txt > Is it right to say that native code process has "system" rights? > > Now, when I create a file using the Java layer, I can open the same > file for "reading" through native code. But, I cannot open a file in > the same place using the native code with "writing" capability. The > permissions of the "files" folder is "app_10", which is the userID of > the app. Right? Doesn't "system" trump "app_10" in terms of > permissions? > > In other words, the objective that I am trying to achieve is to create > a file inside native code at a place other than sdcard. Preferably, > application specific location. > > Any document that anybody could point that would detail more about > security and permissions? I have already read > http://code.google.com/android/devel/security.html. But, it does not > deal with native code details. > > Thanks, > Ravi > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "android-framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-framework?hl=en -~----------~----~----~----~------~----~------~--~---
