linux-kernel - Re: [RFC PATCH 3/6] uprobes/x86: Introduce sizeof_long(), cleanup adjust_ret_addr() and arch_uretprobe_hijack_return

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Date:	Mon, 07 Apr 2014 13:42:47 -0700
From:	Jim Keniston <jkenisto@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <aarapov@...hat.com>,
	David Long <dave.long@...aro.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/6] uprobes/x86: Introduce sizeof_long(), cleanup
 adjust_ret_addr() and arch_uretprobe_hijack_return_addr()

On Mon, 2014-04-07 at 13:34 -0700, Jim Keniston wrote:
> On Sun, 2014-04-06 at 22:16 +0200, Oleg Nesterov wrote:
> > 1. Add the trivial sizeof_long() helper and change other callers of
> >    is_ia32_task() to use it.
> > 
> ...
> 
> This hunk #3 doesn't apply for me.  I can't find in your patch sets
> where you added the lines being replaced (and they weren't there
> originally).

False alarm, I think.  I didn't have your patch #9 v3 from Saturday.
Jim

> 
> After I fixed up this hunk, this patch and the rest applied OK.
> 
> > @@ -450,10 +448,7 @@ static int default_post_xol_op(struct arch_uprobe *auprobe, struct pt_regs *regs
> > 
> >  	if (auprobe->fixups & UPROBE_FIX_CALL) {
> >  		if (adjust_ret_addr(regs->sp, correction)) {
> > -			if (is_ia32_task())
> > -				regs->sp += 4;
> > -			else
> > -				regs->sp += 8;
> > +			regs->sp += sizeof_long();
> >  			return -ERESTART;
> >  		}
> >  	}
> > @@ -738,23 +733,21 @@ if (ret) pr_crit("EMULATE: %lx -> %lx\n", ip, regs->ip);
> ...
> 
> This modified hunk worked for me.
> @@ -450,7 +448,9 @@ static int default_post_xol_op(struct arch_uprobe *auprobe, struct pt_regs *regs
> 
>  	if (auprobe->fixups & UPROBE_FIX_CALL) {
> -		if (adjust_ret_addr(regs->sp, correction))
> +		if (adjust_ret_addr(regs->sp, correction)) {
> +			regs->sp += sizeof_long();
>  			return -ERESTART;
> +		}
>  	}
>  
>  	return 0;
> 
> Jim


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