security: Protection for exploiting null dereference using mmap

[safe/jmp/linux-2.6] / security / dummy.c

diff --git a/security/dummy.c b/security/dummy.c
index 8ffd764..d6a112c 100644 (file)
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -420,8 +420,12 @@ static int dummy_file_ioctl (struct file *file, unsigned int command,
 
 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
                            unsigned long prot,
-                           unsigned long flags)
+                           unsigned long flags,
+                           unsigned long addr,
+                           unsigned long addr_only)
 {
+       if (addr < mmap_min_addr)
+               return -EACCES;
        return 0;
 }