Re: [PATCH v13 0/2] arm64: Enable BTI for the executable as well as the interpreter

Will Deacon
2022-04-20T09:36:23Z

On Tue, Apr 19, 2022 at 10:33:06PM -0700, Kees Cook wrote:
> On Tue, 19 Apr 2022 11:51:54 +0100, Mark Brown wrote:
> > Deployments of BTI on arm64 have run into issues interacting with
> > systemd's MemoryDenyWriteExecute feature. Currently for dynamically
> > linked executables the kernel will only handle architecture specific
> > properties like BTI for the interpreter, the expectation is that the
> > interpreter will then handle any properties on the main executable.
> > For BTI this means remapping the executable segments PROT_EXEC |
> > PROT_BTI.
> >
> > [...]
>
> Applied to for-next/execve, thanks!
>
> [1/2] elf: Allow architectures to parse properties on the main executable
> https://git.kernel.org/kees/c/b2f2553c8e89
> [2/2] arm64: Enable BTI for main executable as well as the interpreter
> https://git.kernel.org/kees/c/b65c760600e2

Kees, please can you drop this series while Catalin's alternative solution
is under discussion (his Reviewed-by preceded the other patches)?

https://lore.kernel.org/r/20220413134946.2732468-1-catalin.marinas@arm.com

Both series expose new behaviours to userspace and we don't need both.

Thanks,

Will