linux-kernel - Re: [PATCH 4/9] x86/dumpstack: Improve opcodes dumping in the Code: section

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Date:   Thu, 15 Mar 2018 13:23:01 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] x86/dumpstack: Improve opcodes dumping in the Code:
 section

On Thu, Mar 15, 2018 at 04:44:43PM +0100, Borislav Petkov wrote:
> @@ -402,6 +396,10 @@ void show_regs(struct pt_regs *regs)
>  	 */
>  	if (!user_mode(regs)) {
>  		show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
> -		show_opcodes((u8 *)regs->ip);
> +
> +		if (regs->ip < PAGE_OFFSET)
> +			pr_cont(" Bad RIP value.\n");
> +		else
> +			show_opcodes((u8 *)regs->ip);

[ Oops, sorry about three reviews for the same patch... ]

I don't see the printk preceding the pr_cont() here.  Shouldn't it be
something like:

			printk(KERN_DEFAULT "Code: Bad RIP value.\n")

?

-- 
Josh