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cpuset: Add allow_attach hook for cpusets on android.

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This patch provides a allow_attach hook for cpusets,
which resolves lots of the following logcat noise.

W SchedPolicy: add_tid_to_cgroup failed to write '2816' (Permission denied); fd=29
W ActivityManager: Failed setting process group of 2816 to 0
W System.err: java.lang.IllegalArgumentException
W System.err:    at android.os.Process.setProcessGroup(Native Method)
W System.err:    at com.android.server.am.ActivityManagerService.applyOomAdjLocked(ActivityManagerService.java:18763)
W System.err:    at com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:19028)
W System.err:    at com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:19106)
W System.err:    at com.android.server.am.ActiveServices.serviceDoneExecutingLocked(ActiveServices.java:2015)
W System.err:    at com.android.server.am.ActiveServices.publishServiceLocked(ActiveServices.java:905)
W System.err:    at com.android.server.am.ActivityManagerService.publishService(ActivityManagerService.java:16065)
W System.err:    at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:1007)
W System.err:    at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2493)
W System.err:    at android.os.Binder.execTransact(Binder.java:453)

Change-Id: Ic1b61b2bbb7ce74c9e9422b5e22ee9078251de21
[Ported to 4.4, added commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Riley Andrews 2015-06-05 18:59:29 -07:00 • committed by John Stultz
parent 13c17d0179
commit dd802a9c97
1 changed files with 18 additions and 0 deletions
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18
kernel/cpuset.c
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@ -2051,12 +2051,30 @@ static void cpuset_bind(struct cgroup_subsys_state *root_css)
mutex_unlock(&cpuset_mutex);
}
static int cpuset_allow_attach(struct cgroup_taskset *tset)
{
const struct cred *cred = current_cred(), *tcred;
struct task_struct *task;
struct cgroup_subsys_state *css;
cgroup_taskset_for_each(task, css, tset) {
tcred = __task_cred(task);
if ((current != task) && !capable(CAP_SYS_ADMIN) &&
cred->euid.val != tcred->uid.val && cred->euid.val != tcred->suid.val)
return -EACCES;
}
return 0;
}
struct cgroup_subsys cpuset_cgrp_subsys = {
.css_alloc = cpuset_css_alloc,
.css_online = cpuset_css_online,
.css_offline = cpuset_css_offline,
.css_free = cpuset_css_free,
.can_attach = cpuset_can_attach,
.allow_attach = cpuset_allow_attach,
.cancel_attach = cpuset_cancel_attach,
.attach = cpuset_attach,
.bind = cpuset_bind,