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

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Message-ID: <ca106fe1b5005f54525e7a644684108f6a823e14.camel@intel.com>
Date:   Mon, 7 Nov 2022 16:49:58 +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 Sun, 2022-11-06 at 10:33 +0100, Florian Weimer wrote:
> * H. J. Lu:
> 
> > 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.  It doesn't solve
> > any
> > issue which can't be solved by not updating glibc.
> 
> Right, and it doesn't even address the library case (the kernel would
> have to hook into mmap for that).  The kernel shouldn't do this.

Shadow stack shouldn't enable as a result of loading a library, if
that's what you mean.