linux-kernel - Re: [RFC PATCH v2 4/4] uretprobes: invoke return probe handlers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130110114254.GA12964@bandura.brq.redhat.com>
Date:	Thu, 10 Jan 2013 12:42:54 +0100
From:	Anton Arapov <anton@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Stone <jistone@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [RFC PATCH v2 4/4] uretprobes: invoke return probe handlers

On Wed, Jan 09, 2013 at 05:28:42PM +0100, Oleg Nesterov wrote:
> On 01/09, Anton Arapov wrote:
> >
> >  static void handle_swbp(struct pt_regs *regs)
> >  {
> >  	struct uprobe *uprobe;
> > +	struct xol_area *area;
> >  	unsigned long bp_vaddr;
> >  	int uninitialized_var(is_swbp);
> >  
> >  	bp_vaddr = uprobe_get_swbp_addr(regs);
> > -	uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
> > +	area = get_xol_area();
> 
> No, we do not need to allocate xol area here.
> 
> > +	if (area) {
> > +		if (bp_vaddr == area->vaddr) {
> > +			handle_rp_swbp(regs);
> 
> Can't understand... this should check bp_vaddr == rp_trampoline_vaddr ?
> 
> Again, unless you remove rp_trampoline_vaddr altogether.

yeah, forgot to correct this chunk before I sent it here. I was working on
xol_get_trampoline_slot removal as you suggested.

thanks for valuable comments, seems you are okay with approach to add
rp_handler into uprobe_consumer struct.

Anton.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/