Implement MMU-based user memory validation

2024-11-29 23:03:31 +00:00
parent 4f84a83611 59e7a64f8e
commit 5f40d83e66
2 changed files with 89 additions and 80 deletions
--- a/src/userprog/exception.c
+++ b/src/userprog/exception.c
@@ -146,6 +146,14 @@ page_fault (struct intr_frame *f)
  write = (f->error_code & PF_W) != 0;
  user = (f->error_code & PF_U) != 0;

+  /* Kernel page fault is further handled by the kernel itself. */
+  if (kernel)
+    {
+      f->eip = (void *)f->eax;
+      f->eax = 0xffffffff;
+      return;
+    }
+
   if (user)
     {
       if (try_alloc_new_page (fault_addr, f->esp))