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

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Message-ID: <YhjSRufZMjXH74e3@hirez.programming.kicks-ass.net>
Date:   Fri, 25 Feb 2022 13:57:42 +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...
> 

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2023,6 +2023,9 @@ static int read_noendbr_hints(struct obj
 			return -1;
 		}
 
+		if (insn->type == INSN_ENDBR)
+			WARN_FUNC("ANNOTATE_NOENDBR on ENDBR", insn->sec, insn->offset);
+
 		insn->noendbr = 1;
 	}
 

vmlinux.o: warning: objtool: .entry.text+0x160: ANNOTATE_NOENDBR on ENDBR
vmlinux.o: warning: objtool: xen_pvh_init()+0x0: ANNOTATE_NOENDBR on ENDBR

right you are... /me goes fix