linux-kernel - Re: [PATCH v2 21/39] x86/ibt: Annotate text references

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Date:   Fri, 25 Feb 2022 14:04:26 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH v2 21/39] x86/ibt: Annotate text references

On Thu, Feb 24, 2022 at 04:47:16PM -0800, Josh Poimboeuf wrote:
> On Thu, Feb 24, 2022 at 03:51:59PM +0100, Peter Zijlstra wrote:
> > @@ -563,12 +564,14 @@ SYM_CODE_END(\asmsym)
> >  	.align 16
> >  	.globl __irqentry_text_start
> >  __irqentry_text_start:
> > +	ANNOTATE_NOENDBR // unwinders
> 
> But the instruction here (first idt entry) actually does have an
> endbr64...
> 
> Also I'm wondering if it would make sense to create an
> 'idt_entry_<vector>' symbol for each entry so objtool knows to validate
> their ENDBRs.

I think we're good on that front since irq_entries_start and
spurious_entries_start capture the first entry and the rest is .rept off
of that.