#include <linux/mnt_namespace.h>
#include <linux/completion.h>
#include <linux/file.h>
+#include <linux/fdtable.h>
#include <linux/workqueue.h>
#include <linux/security.h>
#include <linux/mount.h>
static struct workqueue_struct *khelper_wq;
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
/*
modprobe_path is set via /proc/sys.
return ret;
}
EXPORT_SYMBOL(request_module);
-#endif /* CONFIG_KMOD */
+#endif /* CONFIG_MODULES */
struct subprocess_info {
struct work_struct work;
}
/* We can run anywhere, unlike our parent keventd(). */
- set_cpus_allowed(current, CPU_MASK_ALL);
+ set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
/*
* Our parent is keventd, which runs with elevated scheduling priority.
*/
set_user_nice(current, 0);
- retval = -EPERM;
- if (current->fs->root)
- retval = kernel_execve(sub_info->path,
- sub_info->argv, sub_info->envp);
+ retval = kernel_execve(sub_info->path, sub_info->argv, sub_info->envp);
/* Exec failed? */
sub_info->retval = retval;
}
}
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
/*
* If set, call_usermodehelper_exec() will exit immediately returning -EBUSY
* (used for preventing user land processes from being created after the user
*/
#define RUNNING_HELPERS_TIMEOUT (5 * HZ)
-static int usermodehelper_pm_callback(struct notifier_block *nfb,
- unsigned long action,
- void *ignored)
+/**
+ * usermodehelper_disable - prevent new helpers from being started
+ */
+int usermodehelper_disable(void)
{
long retval;
- switch (action) {
- case PM_HIBERNATION_PREPARE:
- case PM_SUSPEND_PREPARE:
- usermodehelper_disabled = 1;
- smp_mb();
- /*
- * From now on call_usermodehelper_exec() won't start any new
- * helpers, so it is sufficient if running_helpers turns out to
- * be zero at one point (it may be increased later, but that
- * doesn't matter).
- */
- retval = wait_event_timeout(running_helpers_waitq,
+ usermodehelper_disabled = 1;
+ smp_mb();
+ /*
+ * From now on call_usermodehelper_exec() won't start any new
+ * helpers, so it is sufficient if running_helpers turns out to
+ * be zero at one point (it may be increased later, but that
+ * doesn't matter).
+ */
+ retval = wait_event_timeout(running_helpers_waitq,
atomic_read(&running_helpers) == 0,
RUNNING_HELPERS_TIMEOUT);
- if (retval) {
- return NOTIFY_OK;
- } else {
- usermodehelper_disabled = 0;
- return NOTIFY_BAD;
- }
- case PM_POST_HIBERNATION:
- case PM_POST_SUSPEND:
- usermodehelper_disabled = 0;
- return NOTIFY_OK;
- }
+ if (retval)
+ return 0;
+
+ usermodehelper_disabled = 0;
+ return -EAGAIN;
+}
- return NOTIFY_DONE;
+/**
+ * usermodehelper_enable - allow new helpers to be started again
+ */
+void usermodehelper_enable(void)
+{
+ usermodehelper_disabled = 0;
}
static void helper_lock(void)
if (atomic_dec_and_test(&running_helpers))
wake_up(&running_helpers_waitq);
}
-
-static void register_pm_notifier_callback(void)
-{
- pm_notifier(usermodehelper_pm_callback, 0);
-}
-#else /* CONFIG_PM */
+#else /* CONFIG_PM_SLEEP */
#define usermodehelper_disabled 0
static inline void helper_lock(void) {}
static inline void helper_unlock(void) {}
-static inline void register_pm_notifier_callback(void) {}
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
/**
* call_usermodehelper_setup - prepare to call a usermode helper
* @path: path to usermode executable
* @argv: arg vector for process
* @envp: environment for process
+ * @gfp_mask: gfp mask for memory allocation
*
* Returns either %NULL on allocation failure, or a subprocess_info
* structure. This should be passed to call_usermodehelper_exec to
* exec the process and free the structure.
*/
-struct subprocess_info *call_usermodehelper_setup(char *path,
- char **argv, char **envp)
+struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
+ char **envp, gfp_t gfp_mask)
{
struct subprocess_info *sub_info;
- sub_info = kzalloc(sizeof(struct subprocess_info), GFP_ATOMIC);
+ sub_info = kzalloc(sizeof(struct subprocess_info), gfp_mask);
if (!sub_info)
goto out;
{
struct file *f;
- f = create_write_pipe();
+ f = create_write_pipe(0);
if (IS_ERR(f))
return PTR_ERR(f);
*filp = f;
- f = create_read_pipe(f);
+ f = create_read_pipe(f, 0);
if (IS_ERR(f)) {
free_write_pipe(*filp);
return PTR_ERR(f);
enum umh_wait wait)
{
DECLARE_COMPLETION_ONSTACK(done);
- int retval;
+ int retval = 0;
helper_lock();
- if (sub_info->path[0] == '\0') {
- retval = 0;
+ if (sub_info->path[0] == '\0')
goto out;
- }
if (!khelper_wq || usermodehelper_disabled) {
retval = -EBUSY;
sub_info->wait = wait;
queue_work(khelper_wq, &sub_info->work);
- if (wait == UMH_NO_WAIT) /* task has freed sub_info */
- return 0;
+ if (wait == UMH_NO_WAIT) /* task has freed sub_info */
+ goto unlock;
wait_for_completion(&done);
retval = sub_info->retval;
- out:
+out:
call_usermodehelper_freeinfo(sub_info);
+unlock:
helper_unlock();
return retval;
}
struct subprocess_info *sub_info;
int ret;
- sub_info = call_usermodehelper_setup(path, argv, envp);
+ sub_info = call_usermodehelper_setup(path, argv, envp, GFP_KERNEL);
if (sub_info == NULL)
return -ENOMEM;
if (ret < 0)
goto out;
- return call_usermodehelper_exec(sub_info, 1);
+ return call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
out:
call_usermodehelper_freeinfo(sub_info);
{
khelper_wq = create_singlethread_workqueue("khelper");
BUG_ON(!khelper_wq);
- register_pm_notifier_callback();
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff