Make CCrypter use LockedPageManager to manage locked pages

Replace direct calls to mlock.

Also, change the class to lock the memory areas in the constructor and unlock them again in the destructor. This makes sure that locked pages won't leak.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/crypter.h b/src/crypter.h
index d1bdb92c91..04538a3fa5 100644
--- a/src/crypter.h
+++ b/src/crypter.h
@@ -78,19 +78,26 @@ public:
     {
         memset(&chKey, 0, sizeof chKey);
         memset(&chIV, 0, sizeof chIV);
-        munlock(&chKey, sizeof chKey);
-        munlock(&chIV, sizeof chIV);
         fKeySet = false;
     }
 
     CCrypter()
     {
         fKeySet = false;
+
+        // Try to keep the key data out of swap (and be a bit over-careful to keep the IV that we don't even use out of swap)
+        // Note that this does nothing about suspend-to-disk (which will put all our key data on disk)
+        // Note as well that at no point in this program is any attempt made to prevent stealing of keys by reading the memory of the running process.
+        LockedPageManager::instance.LockRange(&chKey[0], sizeof chKey);
+        LockedPageManager::instance.LockRange(&chIV[0], sizeof chIV);
     }
 
     ~CCrypter()
     {
         CleanKey();
+
+        LockedPageManager::instance.UnlockRange(&chKey[0], sizeof chKey);
+        LockedPageManager::instance.UnlockRange(&chIV[0], sizeof chIV);
     }
 };