On 10/18/2016 10:56 AM, Stephen Smalley wrote:
> On 10/18/2016 10:49 AM, Sava Mikalački wrote:
>> I'm not sure how to answer the ownership question. I'm trying to allow
>> my application to write files in data/system/ifw which would be picked
>> up by the IntentFilter and then block certain application components
>> from executing. I have existing code that does that and it worked on
>> Marshmallow but its not working on Nougat because of that permission
>> denied exception when creating a file in data/system/ifw folder. Does
>> that help out in your question?
> On a device running 7.0, ls -ld /data/system/ifw shows that it is owned
> by the system UID and is only writable by owner. So your app has to run
> with the system UID (and thus would be system_app) in order to write
> there. I don't really think that's new to 7.0 though.
What is new to 7.0 is that system_app is no longer allowed to
create/write to system_data_file, which is the default type on
/data/system/ifw. So SELinux would deny those attempts (but you should
get avc messages in logcat / dmesg).
ls -lZd /data/system/ifw and ps -eZ | grep <name-of-your-app> might be
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