Re: [RFC PATCH v9 01/27] Documentation/x86: Add CET description

[Dave Hansen]

On 3/9/20 1:54 PM, H.J. Lu wrote:
>> If a program with the magic ELF CET flags missing canât make a
>> thread with IBT and/or SHSTK enabled, then I think weâve made an
>> error and should fix it.
>> 
> A non-CET program can start a CET program and vice versa.

Could we be specific here, please?

HJ are you saying that:
* CET program can execve() a non-CET program, and
* a non-CET program can execve() a CET program

?

That's obvious.

But what are the rules for clone()?  Should there be rules for
mismatches for CET enabling between threads if a process (not child
processes)?