Re: [PATCH, RFC 45/62] mm: Add the encrypt_mprotect() system call for MKTME

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Wed, May 08, 2019 at 05:44:05PM +0300, Kirill A. Shutemov wrote:
> diff --git a/fs/exec.c b/fs/exec.c
> index 2e0033348d8e..695c121b34b3 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -755,8 +755,8 @@ int setup_arg_pages(struct linux_binprm *bprm,
>  	vm_flags |= mm->def_flags;
>  	vm_flags |= VM_STACK_INCOMPLETE_SETUP;
>  
> -	ret = mprotect_fixup(vma, &prev, vma->vm_start, vma->vm_end,
> -			vm_flags);
> +	ret = mprotect_fixup(vma, &prev, vma->vm_start, vma->vm_end, vm_flags,
> +			     -1);

You added a nice NO_KEY helper a few patches back, maybe use it?

>  	if (ret)
>  		goto out_unlock;
>  	BUG_ON(prev != vma);