linux-kernel - Re: [PATCH v2 03/24] objtool: Handle __sanitize

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Message-ID: <YSYZQsS5MA6BTyfj@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Aug 2021 12:19:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org, joro@...tes.org,
        boris.ostrovsky@...cle.com, jgross@...e.com, x86@...nel.org,
        mbenes@...e.com, rostedt@...dmis.org, dvyukov@...gle.com,
        elver@...gle.com
Subject: Re: [PATCH v2 03/24] objtool: Handle __sanitize_cov*() tail calls

On Fri, Aug 20, 2021 at 04:17:44PM -0700, Josh Poimboeuf wrote:
> On Thu, Jun 24, 2021 at 11:41:02AM +0200, Peter Zijlstra wrote:
> > +	if (insn->sec->noinstr &&
> > +	    !strncmp(insn->call_dest->name, "__sanitizer_cov_", 16)) {
> > +		if (reloc) {
> > +			reloc->type = R_NONE;
> > +			elf_write_reloc(file->elf, reloc);
> > +		}
> > +
> > +		elf_write_insn(file->elf, insn->sec,
> > +			       insn->offset, insn->len,
> > +			       sibling ? arch_ret_insn(insn->len)
> > +			               : arch_nop_insn(insn->len));
> > +
> > +		insn->type = sibling ? INSN_RETURN : INSN_NOP;
> > +	}
> 
> It'd be nice to keep the comment for this case that was in
> add_call_destinations().

Done!