23c9d91b46
Currently, both untrusted apps and priv-apps use the SELinux file label
"app_data_file" for files in their /data/data directory. This is
problematic, as we really want different rules for such files. For
example, we may want to allow untrusted apps to load executable code
from priv-app directories, but disallow untrusted apps from loading
executable code from their own home directories.
This change adds a new file type "privapp_data_file". For compatibility,
we adjust the policy to support access privapp_data_files almost
everywhere we were previously granting access to app_data_files
(adbd and run-as being exceptions). Additional future tightening is
possible here by removing some of these newly added rules.
This label will start getting used in a followup change to
system/sepolicy/private/seapp_contexts, similar to:
-user=_app isPrivApp=true domain=priv_app type=app_data_file levelFrom=user
+user=_app isPrivApp=true domain=priv_app type=privapp_data_file levelFrom=user
For now, this newly introduced label has no usage, so this change
is essentially a no-op.
Test: Factory reset and boot - no problems on fresh install.
Test: Upgrade to new version and test. No compatibility problems on
filesystem upgrade.
Change-Id: I9618b7d91d1c2bcb5837cdabc949f0cf741a2837
26 lines
864 B
Text
26 lines
864 B
Text
# android debug logging, logpersist domains
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type logpersist, domain;
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###
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### Neverallow rules
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###
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### logpersist should NEVER do any of this
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# Block device access.
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neverallow logpersist dev_type:blk_file { read write };
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# ptrace any other app
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neverallow logpersist domain:process ptrace;
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# Write to files in /data/data or system files on /data except misc_logd_file
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neverallow logpersist { privapp_data_file app_data_file system_data_file }:dir_file_class_set write;
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# Only init should be allowed to enter the logpersist domain via exec()
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# Following is a list of debug domains we know that transition to logpersist
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# neverallow_with_undefined_domains {
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# domain
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# -init # goldfish, logcatd, raft
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# -mmi # bat, mtp8996, msmcobalt
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# -system_app # Smith.apk
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# } logpersist:process transition;
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neverallow * logpersist:process dyntransition;
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