EXPORT_SYMBOL_GPL(add_bootloader_randomness);
#if IS_ENABLED(CONFIG_VMGENID)
+static BLOCKING_NOTIFIER_HEAD(vmfork_chain);
+
/*
* Handle a new unique VM ID, which is unique, not secret, so we
* don't credit it, but we do immediately force a reseed after so
crng_reseed(true);
pr_notice("crng reseeded due to virtual machine fork\n");
}
+ blocking_notifier_call_chain(&vmfork_chain, 0, NULL);
}
#if IS_MODULE(CONFIG_VMGENID)
EXPORT_SYMBOL_GPL(add_vmfork_randomness);
#endif
+
+int register_random_vmfork_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&vmfork_chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_random_vmfork_notifier);
+
+int unregister_random_vmfork_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&vmfork_chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_random_vmfork_notifier);
#endif
struct fast_pool {
size_t entropy);
#if IS_ENABLED(CONFIG_VMGENID)
extern void add_vmfork_randomness(const void *unique_vm_id, size_t size);
+extern int register_random_vmfork_notifier(struct notifier_block *nb);
+extern int unregister_random_vmfork_notifier(struct notifier_block *nb);
+#else
+static inline int register_random_vmfork_notifier(struct notifier_block *nb) { return 0; }
+static inline int unregister_random_vmfork_notifier(struct notifier_block *nb) { return 0; }
#endif
extern void get_random_bytes(void *buf, size_t nbytes);