linux-kernel - Re: [PATCH v2 14/39] mm: Introduce VM_SHADOW

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Date:   Tue, 4 Oct 2022 00:29:21 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
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Subject: Re: [PATCH v2 14/39] mm: Introduce VM_SHADOW_STACK for shadow stack
 memory

On Mon, 2022-10-03 at 20:47 +0300, Kirill A . Shutemov wrote:
> > @@ -165,6 +165,8 @@ unsigned long get_mmap_base(int is_legacy)
> >   
> >   const char *arch_vma_name(struct vm_area_struct *vma)
> >   {
> > +     if (vma->vm_flags & VM_SHADOW_STACK)
> > +             return "[shadow stack]";
> >        return NULL;
> >   }
> >   
> 
> But why here?
> 
> CONFIG_ARCH_HAS_SHADOW_STACK implies that there will be more than one
> arch
> that supports shadow stack. The name has to come from generic code
> too, no?

I'm not aware of any other arch that will, so I wonder if I should just
remove ARCH_HAS_SHADOW_STACK actually.