diff options
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 2731d115d725..1d2b6ceea95d 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -27,9 +27,11 @@ */ #include <linux/cgroup.h> +#include <linux/cred.h> #include <linux/ctype.h> #include <linux/errno.h> #include <linux/fs.h> +#include <linux/init_task.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/mm.h> @@ -59,7 +61,7 @@ #include <linux/poll.h> #include <linux/flex_array.h> /* used in cgroup_attach_proc */ -#include <asm/atomic.h> +#include <linux/atomic.h> static DEFINE_MUTEX(cgroup_mutex); @@ -1514,6 +1516,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type, struct cgroup *root_cgrp = &root->top_cgroup; struct inode *inode; struct cgroupfs_root *existing_root; + const struct cred *cred; int i; BUG_ON(sb->s_root != NULL); @@ -1593,7 +1596,9 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type, BUG_ON(!list_empty(&root_cgrp->children)); BUG_ON(root->number_of_cgroups != 1); + cred = override_creds(&init_cred); cgroup_populate_dir(root_cgrp); + revert_creds(cred); mutex_unlock(&cgroup_mutex); mutex_unlock(&inode->i_mutex); } else { @@ -1697,7 +1702,6 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen) { char *start; struct dentry *dentry = rcu_dereference_check(cgrp->dentry, - rcu_read_lock_held() || cgroup_lock_is_held()); if (!dentry || cgrp == dummytop) { @@ -1723,7 +1727,6 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen) break; dentry = rcu_dereference_check(cgrp->dentry, - rcu_read_lock_held() || cgroup_lock_is_held()); if (!cgrp->parent) continue; @@ -3542,7 +3545,8 @@ static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft, } /* the process need read permission on control file */ - ret = file_permission(cfile, MAY_READ); + /* AV: shouldn't we check that it's been opened for read instead? */ + ret = inode_permission(cfile->f_path.dentry->d_inode, MAY_READ); if (ret < 0) goto fail; @@ -4813,8 +4817,7 @@ unsigned short css_id(struct cgroup_subsys_state *css) * on this or this is under rcu_read_lock(). Once css->id is allocated, * it's unchanged until freed. */ - cssid = rcu_dereference_check(css->id, - rcu_read_lock_held() || atomic_read(&css->refcnt)); + cssid = rcu_dereference_check(css->id, atomic_read(&css->refcnt)); if (cssid) return cssid->id; @@ -4826,8 +4829,7 @@ unsigned short css_depth(struct cgroup_subsys_state *css) { struct css_id *cssid; - cssid = rcu_dereference_check(css->id, - rcu_read_lock_held() || atomic_read(&css->refcnt)); + cssid = rcu_dereference_check(css->id, atomic_read(&css->refcnt)); if (cssid) return cssid->depth; |