Re: [PATCH v2] x86: Remove compat vdso support

["H. Peter Anvin" <hpa@linux.intel.com>]

On 03/11/2014 09:50 AM, Andy Lutomirski wrote:
> Looking forward, would it be reasonable to have an extensible set of
> flags that live in the ELF interpreter's headers somewhere that
> indicate compatibility hacks that the program in question doesn't
> need?  There are at least two things I can think of:
> 
>  - no_compat_vdso32: indicates an interpreter that can load a modern
> non-prelinked vdso
>  - no_vsyscall64: indicates that the libc will not attempt to call
> into the vsyscall page on x86_64.
> 
> I'm sure that there are more.  Think PT_GNU_STACK but for more than
> just the stack.
> 
> If we do something like this, there should probably be a prctl or
> similar that can change some of the flags at runtime, too.
> 

This comes many years too late for this purpose.  Such flags might have
a use, but at this point it is rather meaningless, I think.

	-hpa