linux-kernel - Re: [patch 4/8] Immediate Value

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]

Date:	Mon, 18 Jun 2007 21:32:56 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, prasanna@...ibm.com,
	ananth@...ibm.com
Subject: Re: [patch 4/8] Immediate Value - i386 Optimization; kprobes

On Monday 18 June 2007 20:56:32 Andrew Morton wrote:
> On Mon, 18 Jun 2007 14:44:57 -0400
> Chuck Ebbert <cebbert@...hat.com> wrote:
> 
> > > I fancy it's done by the kprobe_page_fault handler, but I do not see
> > > clearly how writing the breakpoint from arch_arm_kprobe() in
> > > non-writeable memory is done.
> > 
> > Looks like it's not merged yet:
> > 
> > http://lkml.org/lkml/2007/6/7/2
> > 
> > This needs to go in before 2.6.22-final
> 
> Andi, I'll include the below two patches in the next batch, OK?

It won't work reliably unless some of the c_p_a() fixes get in first.

> 
> 
> 
> +extern int kernel_text_is_ro;

No externs in .c files


I also don't like kernel_text_is_read_only() much, it would
be better to just lookup_address() it and check the write flag.

But for 2.6.22 as a quick fix it might be better to just
make KPROBES dependent on !DEBUG_RODATA. That would be a one liner.

-Andi
-
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/