Changeset 14149

Timestamp:

Aug 5, 2010, 10:22:25 AM (14 years ago)

Author:

Gary Byers

Message:

If write-protecting a memory region fails with ENOMEM, map the
region readonly.

File:

• trunk/source/lisp-kernel/memory.c (modified) (1 diff)

trunk/source/lisp-kernel/memory.c

@@ -350 +350 @@
   if (status) {
     status = errno;
+    
+    if (status == ENOMEM) {
+      void *mapaddr = mmap(addr,nbytes, PROT_READ | PROT_EXEC, MAP_ANON|MAP_PRIVATE|MAP_FIXED,-1,0);
+      if (mapaddr != MAP_FAILED) {
+        return 0;
+      }
+    }
     Bug(NULL, "couldn't protect " DECIMAL " bytes at " LISP ", errno = %d", nbytes, addr, status);
   }