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Remove "exec_type" from postinstall_file.

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update_engine had an automatic transition to the "postinstall" domain
when executing a "postinstall_file" which required it to be an
entrypoint. This patch removes this automatic transition and the
associated rules in update_engine.te, removing as well the need to
add exec_type to postinstall_file. Instead, update_engine now makes
this transition explicit by calling setexeccon(3).

Bug: 28008031
TEST=make dist; Deployed an update to edison-eng: postinstall runs as "postinstall" domain.

Change-Id: I2b799ac4808c90b010a9e776aaa7015020a94b49
This commit is contained in:
Alex Deymo 2016-04-04 18:58:07 -07:00
parent d25611d97a
commit 5507fa6672
2 changed files with 4 additions and 10 deletions
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2
file.te
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@ -117,7 +117,7 @@ type storage_stub_file, file_type;
# /postinstall: Mount point used by update_engine to run postinstall.
type postinstall_mnt_dir, file_type;
# Files inside the /postinstall mountpoint are all labeled as postinstall_file.
type postinstall_file, file_type, exec_type;
type postinstall_file, file_type;
# /data/misc subdirectories
type adb_keys_file, file_type, data_file_type;

12
update_engine.te
View file

@ -36,19 +36,13 @@ allow update_engine postinstall_mnt_dir:dir mounton;
allow update_engine postinstall_file:filesystem { mount unmount relabelfrom relabelto };
allow update_engine labeledfs:filesystem relabelfrom;
# Allow update_engine to read and execute postinstall_file.
# Allow update_engine to read and execute postinstall_file, which is what the
# postinstall program is relabeled to regardless of its attributes in the new
# system. The postinstall program will run in the "postinstall" domain.
allow update_engine postinstall_file:file rx_file_perms;
allow update_engine postinstall_file:lnk_file r_file_perms;
allow update_engine postinstall_file:dir r_dir_perms;
# The postinstall program is run by update_engine and will always be tagged as a
# postinstall_file regardless of its attributes in the new system.
domain_auto_trans(update_engine, postinstall_file, postinstall)
# A postinstall program is typically a shell script (with a #!), so we allow
# to execute those.
allow update_engine shell_exec:file rx_file_perms;
# Register the service to perform Binder IPC.
binder_use(update_engine)
allow update_engine update_engine_service:service_manager { add };