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How to add groups to a service started by init.rc
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DanM  
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 More options May 2 2012, 2:58 pm
From: DanM <murpd...@gmail.com>
Date: Wed, 2 May 2012 11:58:53 -0700 (PDT)
Local: Wed, May 2 2012 2:58 pm
Subject: How to add groups to a service started by init.rc
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I want to be able to add a group to a service that is launched via stock
Android init.rc in the system/core directory (specifically rild).

Now I don't want to touch/modify the init.rc file that comes in stock
Android.  But would rather add the group as needed later on
during init.

Now I know that this should be done somewhere in the init.<platform>.rc
file but I cannot seem to find the syntax that allows this.


 
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Glenn Kasten  
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 More options May 3 2012, 1:31 pm
From: Glenn Kasten <gkas...@android.com>
Date: Thu, 3 May 2012 10:31:38 -0700 (PDT)
Local: Thurs, May 3 2012 1:31 pm
Subject: Re: How to add groups to a service started by init.rc
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Given that you don't want to modify system/core/rootdir/init.rc, I guess
you could either (a) define TARGET_PROVIDES_INIT_RC
(see system/core/rootdir/Android.mk for usage) and provide your forked copy
that has the change you want, or (b) run a little edit script inside of
that Android.mk during the copy process, that merges the stock init.rc and
your patch at build time, so that it copies a patched version during that
build step. I don't know of a way to merge the stock init.rc and your patch
at runtime in init, again using the stock init.


 
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DanM  
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 More options May 3 2012, 2:17 pm
From: DanM <murpd...@gmail.com>
Date: Thu, 3 May 2012 11:17:54 -0700 (PDT)
Local: Thurs, May 3 2012 2:17 pm
Subject: Re: How to add groups to a service started by init.rc
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Thanks Glenn

Yeah I don't want to carry a copy of init.rc for a 2 LOC change.

I would really like to know if there was a way I could add a group to a
service initialized by the init.rc in my platform.rc.

Something similar to chmod or chowm for kernel sysfs.  Have something like
a init directive i.e. addgroup <service name> <group>.  So vendors can
append groups to services
during service instantiation but not have to modify the base init.rc or
carry a copy of it.

Now I am not sure what the security implications of this is.

Dan


 
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Glenn Kasten  
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 More options May 4 2012, 10:28 am
From: Glenn Kasten <gkas...@android.com>
Date: Fri, 4 May 2012 07:28:59 -0700 (PDT)
Local: Fri, May 4 2012 10:28 am
Subject: Re: How to add groups to a service started by init.rc
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init can only do what the kernel supports, and in this case that's
setgroups(2) at http://linux.die.net/man/2/setgroups
init runs as root, then when it needs to create service, forks a child
(which is still root) and the child then executes setuid() and
setgroups() etc. before execing the service.
It sounds like you're looking for a setgroups() which takes a pid
parameter to specify the target process, rather than current process.
I'm not aware of such an API.  I think you're best bet is to arrange
that init creates the service initially with the right groups, using
one of the methods discussed earlier.

On May 3, 11:17 am, DanM <murpd...@gmail.com> wrote:


 
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