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SubjectRe: [PATCH v4 00/45] x86: Kernel IBT
On Tue, Mar 08, 2022 at 04:30:11PM +0100, Peter Zijlstra wrote:
> Hopefully last posting...
>
> Since last time:
>
> - updated the ftrace_location() patch (naveen, rostedt)
> - added a few comments and clarifications (bpetkov)
> - disable jump-tables (joao)
> - verified clang-14-rc2 works
> - fixed a whole bunch of objtool unreachable insn issue
> - picked up a few more tags
>
> Patches go on top of tip/master + arm64/for-next/linkage. Also available here:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt

<applause> Nice work!!! kernel shadow stacks next? ;-)

Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>

As talked about on IRC there are still a few outstanding issues, that
I'm fine with fixing after the merge window during the upcoming -next
cycle:

- xen hypercall page functions need 'ret' - (I think you already fixed)

- why don't unreachables need to fill up the entire sym hole?

- get rid of the 'c_file' hack

- improve cmdline option intuitive-ness

- properly integrate the retpoline "demotion" with the new Spectre BHI
related patches - probably still needs more discussion - for example
we might instead want to disable IBT and warn

--
Josh

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