linux-imx
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committed 73ab1cb2de9x
#include <trace/events/module.h>#define CAP_BSET (void *)1#define CAP_PI (void *)2static kernel_cap_t usermodehelper_bset = CAP_FULL_SET;static kernel_cap_t usermodehelper_inheritable = CAP_FULL_SET;static DEFINE_SPINLOCK(umh_sysctl_lock);static DECLARE_RWSEM(umhelper_sem);static LIST_HEAD(umh_list);static DEFINE_MUTEX(umh_list_lock);static void call_usermodehelper_freeinfo(struct subprocess_info *info){ if (info->cleanup) (*info->cleanup)(info); kfree(info);}static void umh_complete(struct subprocess_info *sub_info){ retval = sub_info->init(sub_info, new); if (retval) { abort_creds(new); goto out; } } commit_creds(new); sub_info->pid = task_pid_nr(current); if (sub_info->file) if (sub_info->file) { retval = do_execve_file(sub_info->file, sub_info->argv, sub_info->envp); else if (!retval) current->flags |= PF_UMH; } else retval = do_execve(getname_kernel(sub_info->path), (const char __user *const __user *)sub_info->argv, (const char __user *const __user *)sub_info->envp);out: sub_info->retval = retval; /* * call_usermodehelper_exec_sync() will call umh_complete * if UHM_WAIT_PROC. */ if (!(sub_info->wait & UMH_WAIT_PROC)) goto out; } err = -ENOMEM; sub_info = call_usermodehelper_setup_file(file, umh_pipe_setup, umh_clean_and_save_pid, info); if (!sub_info) goto out; err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC); if (!err) { mutex_lock(&umh_list_lock); list_add(&info->list, &umh_list); mutex_unlock(&umh_list_lock); }out: fput(file); return err;}EXPORT_SYMBOL_GPL(fork_usermode_blob);/** * call_usermodehelper_exec - start a usermode application * @sub_info: information about the subprocessa * @wait: wait for the application to finish and return status. if (table->data == CAP_BSET) usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap); if (table->data == CAP_PI) usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap); spin_unlock(&umh_sysctl_lock); } return 0;}void __exit_umh(struct task_struct *tsk){ struct umh_info *info; pid_t pid = tsk->pid; mutex_lock(&umh_list_lock); list_for_each_entry(info, &umh_list, list) { if (info->pid == pid) { list_del(&info->list); mutex_unlock(&umh_list_lock); goto out; } } mutex_unlock(&umh_list_lock); return;out: if (info->cleanup) info->cleanup(info);}struct ctl_table usermodehelper_table[] = { { .procname = "bset", .data = CAP_BSET, .maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long), .mode = 0600, .proc_handler = proc_cap_handler, }, { .procname = "inheritable",