Re: [RFC 37/37] fs/binfmt_elf: Block old shstk elf bit

Edgecombe, Rick P
2022-11-07T16:50:03Z

On Fri, 2022-11-04 at 15:56 -0700, H.J. Lu wrote:
> This change doesn't make a binary CET compatible. It just requires
> that the toolchain
> must be updated and all binaries have to be recompiled with the new
> toolchain to
> enable CET.

I guess you mean distros could again blindly mark all binaries as
supporting shadow stack? I think they would see the failures pretty
quickly in this case, unlike the first time where there was little HW
and no kernel support.

> It doesn't solve any issue which can't be solved by not
> updating glibc.

If users never updates glibc, there won't be a problem, as I elaborated
on in the coverletter. But how are they supposed to know the
consequences of turning on CET?