linux-kernel - Re: [PATCH v2 00/39] x86: Kernel IBT

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Message-ID: <Yhj5GKLfyxbNCGua@hirez.programming.kicks-ass.net>
Date:   Fri, 25 Feb 2022 16:43:20 +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 00/39] x86: Kernel IBT

On Fri, Feb 25, 2022 at 04:28:32PM +0100, Peter Zijlstra wrote:
> +void *skip_endbr(void *addr)
> +{
> +	unsigned long size, offset;
> +
> +	if (is_endbr(*(unsigned int *)addr) &&
> +	    kallsyms_lookup_size_offset((unsigned long)addr, &size, &offset) &&
> +	    !offset)
> +		addr += 4;
> +
> +	return addr;
> +}

Damn, I just realized this makes KERNEL_IBT hard depend on KALLSYMS :-(