Android does not allow apps to access the hardware directly.
The error you see is SE Linux filtering out the access since the sys-fs you
are trying to access is not allowed to access.
You will need to modify the SE Linux policy for the device you are using
and ensure it allows access to below sys-fs.
On Monday, April 3, 2017 at 5:00:05 PM UTC+1, 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
>
>
--
--
unsubscribe: android-porting+unsubscr...@googlegroups.com
website: http://groups.google.com/group/android-porting
---
You received this message because you are subscribed to the Google Groups
"android-porting" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to android-porting+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
