Changeset ae66564 in mainline for kernel/generic/src/ipc/ops/pagein.c

Timestamp:

2016-09-17T15:26:25Z (8 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

5a97302

Parents:

560b81c

Message:

Add reference to frame only if the action was initiated by the kernel

File:

• kernel/generic/src/ipc/ops/pagein.c (modified) (1 diff)

kernel/generic/src/ipc/ops/pagein.c

@@ -46 +46 @@
 static int answer_preprocess(call_t *answer, ipc_data_t *olddata)
 {
+        /*
+         * We only do the special handling below if the call was initiated by
+         * the kernel. Otherwise a malicious task could use this mechanism to
+         * hold memory frames forever.
+         */
+        if (!answer->priv)
+                return EOK;
+
         if (!IPC_GET_RETVAL(answer->data)) {
+
                 pte_t pte;
                 uintptr_t frame;