logd: don't drop user/groups/capabilities/priority in drop_privs()
On Android, unlike POSIX, groups and capabilities are able to be set
per thread. This is useless however, since threads are not a security
boundary. This change drops the logic to set groups and capabilities
per thread and instead leaves all threads running with the initial
user and groups.
This does still drop some capabilities if they're unneeded due to
features being disabled.
This also moves the setpriority() call from code into the init script.
Test: logd runs with the expected user/groups and with the expected
capabilities and priority without any errors
Change-Id: Ibb0e529ea1574a2b8ec391a2678504ca9fbe19be
diff --git a/logd/logd.rc b/logd/logd.rc
index 438419a..530f342 100644
--- a/logd/logd.rc
+++ b/logd/logd.rc
@@ -6,7 +6,8 @@
file /dev/kmsg w
user logd
group logd system package_info readproc
- capabilities SYSLOG AUDIT_CONTROL SETGID
+ capabilities SYSLOG AUDIT_CONTROL
+ priority 10
writepid /dev/cpuset/system-background/tasks
service logd-reinit /system/bin/logd --reinit