[PATCH] error code for mprotect()

SuSv3 says: "The mprotect() function shall fail if:

  [EACCES]
    The prot argument specifies a protection that violates the access
    permission the process has to the underlying memory object.

  [EAGAIN]
    The prot argument specifies PROT_WRITE over a MAP_PRIVATE mapping and
    there are insufficient memory resources to reserve for locking the
    private page.

  [EINVAL]
    The addr argument is not a multiple of the page size as returned by
    sysconf().

  [ENOMEM]
    Addresses in the range [addr,addr+len) are invalid for the address
    space of a process, or specify one or more pages which are not mapped.

  [ENOMEM]
    The prot argument specifies PROT_WRITE on a MAP_PRIVATE mapping, and
    it would require more space than the system is able to supply for
    locking the private pages, if required.

  [ENOTSUP]
    The implementation does not support the combination of accesses
    requested in the prot argument."

This fixes error code of mprotect() of the ENOMEM case.

mm/mprotect.c

@@ -290,7 +290,7 @@ asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned long prot
 	down_write(&current->mm->mmap_sem);
 
 	vma = find_vma_prev(current->mm, start, &prev);
-	error = -EFAULT;
+	error = -ENOMEM;
 	if (!vma || vma->vm_start > start)
 		goto out;
 
@@ -323,7 +323,7 @@ asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned long prot
 		nstart = tmp;
 		vma = next;
 		if (!vma || vma->vm_start != nstart) {
-			error = -EFAULT;
+			error = -ENOMEM;
 			goto out;
 		}
 	}