9b2e0cbeea
In kernel 4.7, the capability and capability2 classes were split apart
from cap_userns and cap2_userns (see kernel commit
8e4ff6f228e4722cac74db716e308d1da33d744f). Since then, Android cannot be
run in a container with SELinux in enforcing mode.
This change applies the existing capability rules to user namespaces as
well as the root namespace so that Android running in a container
behaves the same on pre- and post-4.7 kernels.
This is essentially:
1. New global_capability_class_set and global_capability2_class_set
that match capability+cap_userns and capability2+cap2_userns,
respectively.
2. s/self:capability/self:global_capability_class_set/g
3. s/self:capability2/self:global_capability2_class_set/g
4. Add cap_userns and cap2_userns to the existing capability_class_set
so that it covers all capabilities. This set was used by several
neverallow and dontaudit rules, and I confirmed that the new
classes are still appropriate.
Test: diff new policy against old and confirm that all new rules add
only cap_userns or cap2_userns;
Boot ARC++ on a device with the 4.12 kernel.
Bug: crbug.com/754831
Change-Id: I4007eb3a2ecd01b062c4c78d9afee71c530df95f
43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
type runas, domain, mlstrustedsubject;
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type runas_exec, exec_type, file_type;
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allow runas adbd:fd use;
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allow runas adbd:process sigchld;
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allow runas adbd:unix_stream_socket { read write };
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allow runas shell:fd use;
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allow runas shell:fifo_file { read write };
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allow runas shell:unix_stream_socket { read write };
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allow runas devpts:chr_file { read write ioctl };
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allow runas shell_data_file:file { read write };
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# run-as reads package information.
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allow runas system_data_file:file r_file_perms;
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allow runas system_data_file:lnk_file getattr;
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# The app's data dir may be accessed through a symlink.
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allow runas system_data_file:lnk_file read;
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# run-as checks and changes to the app data dir.
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dontaudit runas self:global_capability_class_set dac_override;
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allow runas app_data_file:dir { getattr search };
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# run-as switches to the app UID/GID.
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allow runas self:global_capability_class_set { setuid setgid };
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# run-as switches to the app security context.
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selinux_check_context(runas) # validate context
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allow runas self:process setcurrent;
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allow runas non_system_app_set:process dyntransition; # setcon
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# runas/libselinux needs access to seapp_contexts_file to
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# determine which domain to transition to.
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allow runas seapp_contexts_file:file r_file_perms;
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###
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### neverallow rules
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###
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# run-as cannot have capabilities other than CAP_SETUID and CAP_SETGID
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neverallow runas self:global_capability_class_set ~{ setuid setgid };
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neverallow runas self:global_capability2_class_set *;
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