You need .te file for your module even though it is permissive mode.
Also try move app to /system/priv-app/ which will remove untrusted_app erro
On Monday, April 3, 2017 at 6:00:05 PM UTC+2, himanshu wrote:
>
> Android application in java having permission issues when accessing sysfs
> entry.
>
> try{
> FileOutputStream fos = new
> FileOutputStream("/sys/class/shift_reg/shift_reg/value");
> byte mybyte = 1;
> fos.write(mybyte);
> fos.close();} catch ( Exception e) {
> Log.d(TAG, "Failed in writing to Shift Register"); <------- I am always
> getting this exception.}
>
>
> 1) Have tried putting 'setenforce 0'. Does't work. Even though enforce
> level is permissive.
>
> 2) Do I have to access using JNI way: ( android-app -> jni -> driver )
>
> 3) I have set file permission as 0777 for the sysfs node file.
>
>
> Dmesg Error message:
>
> [ 417.176302] type=1400 audit(418.589:63): avc: denied { write } for
> pid=3164 comm="com.android.cam" name="value" dev="sysfs" ino=9749
> scontext=u:r:untrusted_app:s0 tcontext=u:object_r:sysfs:s0 tclass=file
> permissive=1
>
> ps -Z
>
> u:r:untrusted_app:s0 u0_a67 4360 333
> com.android.cam
>
>
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