The patch titled
PM: disable usermode helper before hibernation and suspend
has been added to the -mm tree. Its filename is
pm-disable-usermode-helper-before-hibernation-and-suspend.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PM: disable usermode helper before hibernation and suspend
From: Rafael J. Wysocki <rjw@xxxxxxx>
Use a hibernation and suspend notifier to disable the user mode helper before
a hibernation/suspend and enable it after the operation.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
Acked-by: Nigel Cunningham <nigel@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kmod.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff -puN kernel/kmod.c~pm-disable-usermode-helper-before-hibernation-and-suspend kernel/kmod.c
--- a/kernel/kmod.c~pm-disable-usermode-helper-before-hibernation-and-suspend
+++ a/kernel/kmod.c
@@ -33,6 +33,8 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/resource.h>
+#include <linux/notifier.h>
+#include <linux/suspend.h>
#include <asm/uaccess.h>
extern int max_threads;
@@ -46,6 +48,14 @@ static struct workqueue_struct *khelper_
*/
char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
+/*
+ * If set, both call_usermodehelper_keys() and call_usermodehelper_pipe() exit
+ * immediately returning -EBUSY. Used for preventing user land processes from
+ * being created after the user land has been frozen during a system-wide
+ * hibernation or suspend operation.
+ */
+static int usermodehelper_disabled;
+
/**
* request_module - try to load a kernel module
* @fmt: printf style format string for the name of the module
@@ -265,6 +275,24 @@ static void __call_usermodehelper(struct
}
}
+static int usermodehelper_pm_callback(struct notifier_block *nfb,
+ unsigned long action,
+ void *ignored)
+{
+ switch (action) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+ usermodehelper_disabled = 1;
+ return NOTIFY_OK;
+ case PM_POST_HIBERNATION:
+ case PM_POST_SUSPEND:
+ usermodehelper_disabled = 0;
+ return NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
/**
* call_usermodehelper_setup - prepare to call a usermode helper
* @path - path to usermode executable
@@ -374,7 +402,7 @@ int call_usermodehelper_exec(struct subp
goto out;
}
- if (!khelper_wq) {
+ if (!khelper_wq || usermodehelper_disabled) {
retval = -EBUSY;
goto out;
}
@@ -431,4 +459,5 @@ void __init usermodehelper_init(void)
{
khelper_wq = create_singlethread_workqueue("khelper");
BUG_ON(!khelper_wq);
+ pm_notifier(usermodehelper_pm_callback, 0);
}
_
Patches currently in -mm which might be from rjw@xxxxxxx are
origin.patch
mtrr-atomicity-fix.patch
x86_64-pm_trace-support.patch
i386-do-not-restore-reserved-memory-after-hibernation.patch
acpi-preserve-the-ebx-value-in-acpi_copy_wakeup_routine.patch
freezer-make-kernel-threads-nonfreezable-by-default.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix-fix.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix-2.patch
freezer-run-show_state-when-freezing-times-out.patch
pm-do-not-require-dev-spew-to-get-pm_debug.patch
swsusp-remove-incorrect-code-from-userc.patch
swsusp-remove-code-duplication-between-diskc-and-userc.patch
swsusp-introduce-restore-platform-operations.patch
swsusp-fix-hibernation-code-ordering.patch
hibernation-prepare-to-enter-the-low-power-state.patch
freezer-avoid-freezing-kernel-threads-prematurely.patch
freezer-use-__set_current_state-in-refrigerator.patch
freezer-return-int-from-freeze_processes.patch
freezer-remove-redundant-check-in-try_to_freeze_tasks.patch
pm-introduce-hibernation-and-suspend-notifiers.patch
pm-introduce-hibernation-and-suspend-notifiers-tidy.patch
pm-disable-usermode-helper-before-hibernation-and-suspend.patch
shrink_slab-handle-bad-shrinkers.patch
-
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