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logd: allow logd to write to /dev/cpuset files

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Required by logd on devices with USE_CPUSETS defined.

Make /dev/cpuset/background, /dev/cpuset/foreground and
/dev/cpuset/task writeable by system gid. Add logd to system
group for writing to cpuset files and to root group to avoid
regressions. When dropping privs, also drop supplementary groups.

Bug: 22699101
Change-Id: Icc01769b18b5e1f1649623da8325a8bfabc3a3f0
This commit is contained in:
Jeff Vander Stoep 2015-07-23 15:18:36 -07:00 • committed by Jeffrey Vander Stoep
parent ed2fe57c25
commit 3f62a020c4
2 changed files with 8 additions and 3 deletions
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4
logd/main.cpp
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@ -103,6 +103,10 @@ static int drop_privs() {
return -1;
}
if (setgroups(0, NULL) == -1) {
return -1;
}
if (setgid(AID_LOGD) != 0) {
return -1;
}

7
rootdir/init.rc
View file

@ -145,9 +145,9 @@ on init
chown system system /dev/cpuset/tasks
chown system system /dev/cpuset/foreground/tasks
chown system system /dev/cpuset/background/tasks
chmod 0644 /dev/cpuset/foreground/tasks
chmod 0644 /dev/cpuset/background/tasks
chmod 0644 /dev/cpuset/tasks
chmod 0664 /dev/cpuset/foreground/tasks
chmod 0664 /dev/cpuset/background/tasks
chmod 0664 /dev/cpuset/tasks
# qtaguid will limit access to specific data based on group memberships.
@ -523,6 +523,7 @@ service logd /system/bin/logd
socket logd stream 0666 logd logd
socket logdr seqpacket 0666 logd logd
socket logdw dgram 0222 logd logd
group root system
service logd-reinit /system/bin/logd --reinit
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