1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index de9e45dca70f..88766bd91803 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -454,6 +454,7 @@ EXPORT_SYMBOL_GPL(klp_enable_patch);
  * /sys/kernel/livepatch/<patch>
  * /sys/kernel/livepatch/<patch>/enabled
  * /sys/kernel/livepatch/<patch>/transition
+ * /sys/kernel/livepatch/<patch>/signal
  * /sys/kernel/livepatch/<patch>/<object>
  * /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
  */
@@ -528,11 +529,40 @@ static ssize_t transition_show(struct kobject *kobj,
                         patch == klp_transition_patch);
 }
 
+static ssize_t signal_store(struct kobject *kobj, struct kobj_attribute *attr,
+                            const char *buf, size_t count)
+{
+        struct klp_patch *patch;
+        int ret;
+        bool val;
+
+        patch = container_of(kobj, struct klp_patch, kobj);
+
+        /*
+         * klp_mutex lock is not grabbed here intentionally. It is not really
+         * needed. The race window is harmless and grabbing the lock would only
+         * hold the action back.
+         */
+        if (patch != klp_transition_patch)
+                return -EINVAL;
+
+        ret = kstrtobool(buf, &val);
+        if (ret)
+                return ret;
+
+        if (val)
+                klp_send_signals();
+
+        return count;
+}
+
 static struct kobj_attribute enabled_kobj_attr = __ATTR_RW(enabled);
 static struct kobj_attribute transition_kobj_attr = __ATTR_RO(transition);
+static struct kobj_attribute signal_kobj_attr = __ATTR_WO(signal);
 static struct attribute *klp_patch_attrs[] = {
         &enabled_kobj_attr.attr,
         &transition_kobj_attr.attr,
+        &signal_kobj_attr.attr,
         NULL
 };