From: Suresh Siddha <suresh.b.siddha@intel.com>
To: "rostedt@goodmis.org" <rostedt@goodmis.org>
Cc: "mingo@elte.hu" <mingo@elte.hu>, "hpa@zytor.com" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [patch 3/3] x86_64, cpa: use only text section in set_kernel_text_rw/ro
Date: Fri, 30 Oct 2009 11:17:08 -0800 [thread overview]
Message-ID: <1256930228.2679.5.camel@sbs-t61.sc.intel.com> (raw)
In-Reply-To: <1256781977.26028.2139.camel@gandalf.stny.rr.com>
On Wed, 2009-10-28 at 19:06 -0700, Steven Rostedt wrote:
> On Wed, 2009-10-28 at 18:46 -0800, Suresh Siddha wrote:
> > plain text document attachment (fix_kernel_text_ro_rw.patch)
> > set_kernel_text_rw()/set_kernel_text_ro() are marking pages starting
> > from _text to __start_rodata as RW or RO.
> >
> > With CONFIG_DEBUG_RODATA, there might be free pages (associated with
> > padding the sections to 2MB large page boundary) between text
> > and rodata sections that are given back to page allocator. So we should
> > use only use the start (__text) and end (__stop___ex_table) of the
> > text section in set_kernel_text_rw()/set_kernel_text_ro().
> >
> > Cc: Steven Rostedt <rostedt@goodmis.org>
> > Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
> > ---
> >
>
> I'll go ahead and test this to make sure it does not bust ftrace with an
> allyesconfig.
Steve, Good to go?
If so, Ingo can you please consider this patchset?
thanks,
suresh
next prev parent reply other threads:[~2009-10-30 18:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-29 2:46 [patch 1/3] x86, cpa: fix kernel text RO checks in static_protection() Suresh Siddha
2009-10-29 2:05 ` Steven Rostedt
2009-10-29 2:46 ` [patch 2/3] x86_64, ftrace: make ftrace use kernel identity mapping to modify code Suresh Siddha
2009-11-02 18:54 ` [tip:x86/mm] x86_64, ftrace: Make " tip-bot for Suresh Siddha
2009-10-29 2:46 ` [patch 3/3] x86_64, cpa: use only text section in set_kernel_text_rw/ro Suresh Siddha
2009-10-29 2:06 ` Steven Rostedt
2009-10-30 19:17 ` Suresh Siddha [this message]
2009-10-30 19:59 ` Steven Rostedt
2009-11-02 18:55 ` [tip:x86/mm] x86_64, cpa: Use " tip-bot for Suresh Siddha
2009-11-02 18:54 ` [tip:x86/mm] x86, cpa: Fix kernel text RO checks in static_protection() tip-bot for Suresh Siddha
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