linux-kernel - Re: [PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on func_ptr_is_kernel

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: <20131106115004.GB20249@gmail.com>
Date:	Wed, 6 Nov 2013 12:50:04 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	x86@...nel.org, lkml <linux-kernel@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on
 func_ptr_is_kernel_text


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> (2013/11/06 15:07), Ingo Molnar wrote:
> > 
> > * Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> > 
> >>>> [...] I hope to build the list when the kernel build time if 
> >>>> possible... Would you have any idea to classify some annotated(but no 
> >>>> side-effect) functions?
> >>>
> >>> The macro magic I can think of would need to change the syntax of the 
> >>> function definition - for example that is how the SYSCALL_DEFINE*() 
> >>> macros work.
> >>
> >> Would you mean something like the below macro? :)
> >>
> >> NOKPROBE_SYMBOL(int, func_ptr_is_kernel_text)(void *ptr)
> > 
> > I think this is rather ugly and harder to maintain. The whole _point_ of 
> > such annotations is to make them 'easy on the eyes', to make it easy to 
> > skip a 'noinline', 'noprobe' or 'notrace' tag.
> > 
> > Using something like NOKPROBE_SYMBOL() makes the whole construct ugly and 
> > attention seeking.
> 
> Hmm, by the way how about Steven's idea? A macro like EXPORT_SYMBOL? At 
> least for kprobes_blacklist, which is defined/maintained in kprobes.c 
> for some symbols(*), that is useful for updating it because we can put 
> it near the function definition.

Dunno, it feels a bit fragile to me.

Thanks,

	Ingo
--
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/