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

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Message-ID: <5b62474bfa48632803f5909f9c539a50242b991d.camel@intel.com>
Date:   Mon, 7 Nov 2022 16:49:50 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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Subject: Re: [RFC 37/37] fs/binfmt_elf: Block old shstk elf bit

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?