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Diffstat (limited to 'kernel/cgroup/cgroup-v1.c')
-rw-r--r--kernel/cgroup/cgroup-v1.c75
1 files changed, 65 insertions, 10 deletions
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 7bf4b1533f34..024085daab1a 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -99,8 +99,9 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
if (cgroup_on_dfl(to))
return -EINVAL;
- if (!cgroup_may_migrate_to(to))
- return -EBUSY;
+ ret = cgroup_migrate_vet_dst(to);
+ if (ret)
+ return ret;
mutex_lock(&cgroup_mutex);
@@ -121,7 +122,7 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
* ->can_attach() fails.
*/
do {
- css_task_iter_start(&from->self, &it);
+ css_task_iter_start(&from->self, 0, &it);
task = css_task_iter_next(&it);
if (task)
get_task_struct(task);
@@ -373,7 +374,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
if (!array)
return -ENOMEM;
/* now, populate the array */
- css_task_iter_start(&cgrp->self, &it);
+ css_task_iter_start(&cgrp->self, 0, &it);
while ((tsk = css_task_iter_next(&it))) {
if (unlikely(n == length))
break;
@@ -510,10 +511,58 @@ static int cgroup_pidlist_show(struct seq_file *s, void *v)
return 0;
}
-static ssize_t cgroup_tasks_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
+static ssize_t __cgroup1_procs_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off,
+ bool threadgroup)
{
- return __cgroup_procs_write(of, buf, nbytes, off, false);
+ struct cgroup *cgrp;
+ struct task_struct *task;
+ const struct cred *cred, *tcred;
+ ssize_t ret;
+
+ cgrp = cgroup_kn_lock_live(of->kn, false);
+ if (!cgrp)
+ return -ENODEV;
+
+ task = cgroup_procs_write_start(buf, threadgroup);
+ ret = PTR_ERR_OR_ZERO(task);
+ if (ret)
+ goto out_unlock;
+
+ /*
+ * Even if we're attaching all tasks in the thread group, we only
+ * need to check permissions on one of them.
+ */
+ cred = current_cred();
+ tcred = get_task_cred(task);
+ if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
+ !uid_eq(cred->euid, tcred->uid) &&
+ !uid_eq(cred->euid, tcred->suid))
+ ret = -EACCES;
+ put_cred(tcred);
+ if (ret)
+ goto out_finish;
+
+ ret = cgroup_attach_task(cgrp, task, threadgroup);
+
+out_finish:
+ cgroup_procs_write_finish(task);
+out_unlock:
+ cgroup_kn_unlock(of->kn);
+
+ return ret ?: nbytes;
+}
+
+static ssize_t cgroup1_procs_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ return __cgroup1_procs_write(of, buf, nbytes, off, true);
+}
+
+static ssize_t cgroup1_tasks_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ return __cgroup1_procs_write(of, buf, nbytes, off, false);
}
static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,
@@ -592,7 +641,7 @@ struct cftype cgroup1_base_files[] = {
.seq_stop = cgroup_pidlist_stop,
.seq_show = cgroup_pidlist_show,
.private = CGROUP_FILE_PROCS,
- .write = cgroup_procs_write,
+ .write = cgroup1_procs_write,
},
{
.name = "cgroup.clone_children",
@@ -611,7 +660,7 @@ struct cftype cgroup1_base_files[] = {
.seq_stop = cgroup_pidlist_stop,
.seq_show = cgroup_pidlist_show,
.private = CGROUP_FILE_TASKS,
- .write = cgroup_tasks_write,
+ .write = cgroup1_tasks_write,
},
{
.name = "notify_on_release",
@@ -701,7 +750,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
}
rcu_read_unlock();
- css_task_iter_start(&cgrp->self, &it);
+ css_task_iter_start(&cgrp->self, 0, &it);
while ((tsk = css_task_iter_next(&it))) {
switch (tsk->state) {
case TASK_RUNNING:
@@ -846,6 +895,8 @@ static int cgroup1_show_options(struct seq_file *seq, struct kernfs_root *kf_roo
seq_puts(seq, ",noprefix");
if (root->flags & CGRP_ROOT_XATTR)
seq_puts(seq, ",xattr");
+ if (root->flags & CGRP_ROOT_CPUSET_V2_MODE)
+ seq_puts(seq, ",cpuset_v2_mode");
spin_lock(&release_agent_path_lock);
if (strlen(root->release_agent_path))
@@ -900,6 +951,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
opts->cpuset_clone_children = true;
continue;
}
+ if (!strcmp(token, "cpuset_v2_mode")) {
+ opts->flags |= CGRP_ROOT_CPUSET_V2_MODE;
+ continue;
+ }
if (!strcmp(token, "xattr")) {
opts->flags |= CGRP_ROOT_XATTR;
continue;