The key here is "sd card". All files on the sd card belong to system with permissions 066 (it's a FAT filesystem that doesn't support per-file permissions and ownership). This is true both for native code and bytecode. Your native code isn't running as the system uid.
JBQ On 12/24/08, 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 > > > > > -- Jean-Baptiste M. "JBQ" Queru Android Engineer, Google. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
