I can set the GPIO manually from the command line through the debug port by
going to SU mode.
I can't get access to the GPIO from the Android JNI. I get permission
denied in the debug output. Setting the GPIO in export works as the new
GPIO folder for that pin appears in /sys/class/gpio but any attempt to
access the underlying directories to set the direction of value has
permission denied.
I've even tried to create the GPIO in the init.rc file and setting suitable
access but this still fails to work. Selinux seems to be the culprit.
The following is the output from debug when I try to export GPIO32 and then
set direction.
[ 532.695168] type=1400 audit(1590299645.070:43): avc: denied { read write
} for pid=4246 comm="on.torquelogger" name="export" dev="sysfs" ino=3800
scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:sysfs:s0
tclass=file permissive=1
[ 532.695984] type=1400 audit(1590299645.070:43): avc: denied { read write
} for pid=4246 comm="on.torquelogger" name="export" dev="sysfs" ino=3800
scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:sysfs:s0
tclass=file permissive=1
[ 532.696053] type=1400 audit(1590299645.070:44): avc: denied { open } for
pid=4246 comm="on.torquelogger" path="/sys/class/gpio/export" dev="sysfs"
ino=3800 scontext=u:r:untrusted_app:s0:c512,c768
tcontext=u:object_r:sysfs:s0 tclass=file permissive=1
I tried to add the following to untrsusted_app.te but it fails to build.
Using the
allow untrusted_app sysfs:file {read write open};
This gives a build error (neverallow base_typeattr_197 sysfs (file (write))
Any clues on how to create the policy to allow GPIO access from the user
program. This will run on dedicated hardware and not user phones.
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