- kernel_cap_t inheritable, permitted, effective;
- __u32 version;
- task_t *target;
- int ret;
- pid_t pid;
-
- if (get_user(version, &header->version))
- return -EFAULT;
-
- if (version != _LINUX_CAPABILITY_VERSION) {
- if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
- return -EFAULT;
- return -EINVAL;
- }
-
- if (get_user(pid, &header->pid))
- return -EFAULT;
-
- if (pid && pid != current->pid && !capable(CAP_SETPCAP))
- return -EPERM;
-
- if (copy_from_user(&effective, &data->effective, sizeof(effective)) ||
- copy_from_user(&inheritable, &data->inheritable, sizeof(inheritable)) ||
- copy_from_user(&permitted, &data->permitted, sizeof(permitted)))
- return -EFAULT;
-
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- if (pid > 0 && pid != current->pid) {
- target = find_task_by_pid(pid);
- if (!target) {
- ret = -ESRCH;
- goto out;
- }
- } else
- target = current;
-
- ret = 0;
-
- /* having verified that the proposed changes are legal,
- we now put them into effect. */
- if (pid < 0) {
- if (pid == -1) /* all procs other than current and init */
- ret = cap_set_all(&effective, &inheritable, &permitted);
-
- else /* all procs in process group */
- ret = cap_set_pg(-pid, &effective, &inheritable,
- &permitted);
- } else {
- ret = security_capset_check(target, &effective, &inheritable,
- &permitted);
- if (!ret)
- security_capset_set(target, &effective, &inheritable,
- &permitted);
- }
-
-out:
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
-
- return ret;