On Wed, 2012-01-25 at 10:12 -0500, Joshua Brindle wrote:
> I'm working through some denials with SEAndroid on Galaxy Nexus and I'm confused
> about app data labeling. I thought that the app data would be labeled with the
> same category as the app, so c13 app would have c13 on the files in /data. I see
> the note in seapp_contexts that levelfromUID only works on apps. How do you get
> filesystem separation without labeling the apps with the category?
>
>
On both the emulator and my Nexus S, the files in /data/data are labeled
with categories.
> Also, I'm getting denials like this, which I'm a little confused about since
> trusted_app is part of appdomain and appdomain has create_file_perms on
> app_data_file. I'm not sure how untrusted_app would be able to keep any state
> since everything in /data/data seems to be labeled app_data_file though:
>
> <5>[ 25.067932] type=1400 audit(1327503267.632:59): avc: denied { add_name }
> for pid=461 comm="ContactsProvide" name="contacts2.db-mj1A7E80AF"
> scontext=u:r:trusted_app:s0:c0 tcontext=u:object_r:app_data_file:s0 tclass=dir
> <5>[ 25.148498] type=1400 audit(1327503267.718:60): avc: denied {
> remove_name } for pid=461 comm="ContactsProvide" name="contacts2.db-mj1A7E80AF"
> dev=mmcblk0p12 ino=578665 scontext=u:r:trusted_app:s0:c0
> tcontext=u:object_r:app_data_file:s0 tclass=dir
> <5>[ 26.209320] type=1400 audit(1327503268.773:61): avc: denied { write }
> for pid=570 comm="viders.calendar" name="calendar.db" dev=mmcblk0p12 ino=578386
> scontext=u:r:trusted_app:s0:c6 tcontext=u:object_r:app_data_file:s0 tclass=file
> <5>[ 26.263183] type=1400 audit(1327503268.828:62): avc: denied { setattr }
> for pid=570 comm="viders.calendar" name="calendar.db" dev=mmcblk0p12 ino=578386
> scontext=u:r:trusted_app:s0:c6 tcontext=u:object_r:app_data_file:s0 tclass=file
>
I believe that these are from MLS constraints on writing down.
I don't think your /data/data is labeled properly.
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--
James Carter <jwcart2@xxxxxxxxxxxxx>
National Security Agency
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