On 10/18/2016 10:41 AM, Sava Mikalački wrote:
> Thanks everyone for your quick answers. Yes, compilation worked once I
> defined the type in file.te. I will try this out and also will try with
> system_app, probably thats simpler as you said. Whats confusing me is
> that I get Permission denied exception when I try to create a file in
> that directory with a system app but there is no selinux avc denial
> before the exception, it just fires the exception and thats it, so I'm
> afraid if changing the sepolicy would even work.
What's the ownership and mode of the directory?
> 2016-10-18 16:35 GMT+02:00 Stephen Smalley <s...@tycho.nsa.gov
> On 10/18/2016 10:23 AM, William Roberts wrote:
> > On Oct 18, 2016 9:34 AM, "Sava Mikalački" <mikalac...@gmail.com
> > <mailto:mikalac...@gmail.com <mailto:mikalac...@gmail.com>>> wrote:
> >> I'm trying to extend aosp file_contexts by adding a new entry for
> > /data/system/ifw. I've created a file_contexts under my vendor directory
> > structure but if I try to use the new label, build crashes with unknown
> > type. I'm
> > You need to declare the type with the type keyword:
> > type system_data_ifw, file_type;
> > trying to enable a platform_app to write to data/system/ifw and here is
> > what I have so far:
> >> file_contexts:
> >> /data/system/ifw(/.*)?
> >> platform_app.te:
> >> allow platform_app system_data_ifw:file create_file_perms;
> > Platform applications shouldn't be creating stuff around the system,
> > they should stick to their sandbox. I cant recall offhand, but a never
> > allow I wrote might assert itself on that allow rule.
> Probably not since it is a new type he just defined. However, it occurs
> to me that DAC will be a problem for this use case, since platform apps
> can be assigned arbitrary UIDs and thus won't be able to pass the DAC
> checks on writing to /data/system/ifw unless you set up a group, map a
> permission to that group, assign that group to /data/system/ifw, and
> make it group-writable. Simpler if you use a system_app or some other
> fixed UID app instead, although that carries its own set of issues.
> I have only two questions: How much and give it to me.
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