VMM - set_page does not overwrite 4kb pages with 2mb

2018-01-02 12:24:02 +01:00
parent 518eaf73c3
commit e68698ff80
2 changed files with 10 additions and 0 deletions
--- a/src/kernel/memory/vmm.c
+++ b/src/kernel/memory/vmm.c
@@ -56,6 +56,8 @@ int vmm_set_page(void *P4, uintptr_t addr, uintptr_t page, uint16_t flags)
          && P3e(P4, addr).present
        ))
      return -1;
+    if(P2e(P4, addr).present && !P2e(P4,addr).huge)
+      return -1;
    P2e(P4, addr).value = page | flags;
    return 0;
  }