linux-kernel - Re: [PATCH 0/3] CONFIG_DEBUG_SET_MODULE

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Date:	Tue, 24 Mar 2015 13:04:47 +0100
From:	Paolo Pisati <p.pisati@...il.com>
To:	Laura Abbott <lauraa@...eaurora.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] CONFIG_DEBUG_SET_MODULE_RONX fixups

On Wed, Feb 25, 2015 at 02:17:55PM -0800, Kees Cook wrote:
> On Wed, Feb 25, 2015 at 2:14 PM, Laura Abbott <lauraa@...eaurora.org> wrote:
> > Hi,
> >
> > CONFIG_DEBUG_SET_MODULE_RONX is currently non-functional on arm and arm64
> > because of changes in behavior of is_module_addr. This series fixes
> > both arm and arm64 to work correctly and corrects a minor bug
> > related to section alignment in modules.
> >
> > Laura Abbott (3):
> >   arm64: Don't use is_module_addr in setting page attributes
> >   arm: Don't use is_module_addr in setting page attributes
> >   kernel/module.c: Update debug alignment after symtable generation
> >
> >  arch/arm/mm/pageattr.c   | 5 ++++-
> >  arch/arm64/mm/pageattr.c | 5 ++++-
> >  kernel/module.c          | 2 ++
> >  3 files changed, 10 insertions(+), 2 deletions(-)
> 
> Thanks for fixing this!
> 
> Out of curiosity, which change broke DEBUG_SET_MODULE_RONX ? (i.e.
> does this need a CC: stable, and if so, through which release?)

we need it for 3.19.x too:

without your patches:

root@...glebone:~# cat /sys/module/bridge/sections/.text
0xbf199000
root@...glebone:~# cat /sys/module/bridge/sections/.data
0xbf1ae000
root@...glebone:~# grep -e 0xbf199000 -e 0xbf1ae000 /sys/kernel/debug/kernel_page_tables
0xbf199000-0xbf1b6000         116K     RW x      MEM/CACHED/WBRA

with you patches:

root@...glebone:~# cat /sys/module/bridge/sections/.text                                                                                   
0xbf191000
root@...glebone:~# cat /sys/module/bridge/sections/.data
0xbf1a6000
root@...glebone:~# grep -e 0xbf191000 -e 0xbf1a6000 /sys/kernel/debug/kernel_page_tables                                                   
0xbf191000-0xbf1a2000          68K     ro x      MEM/CACHED/WBRA
0xbf1a2000-0xbf1a6000          16K     ro NX     MEM/CACHED/WBRA
0xbf1a6000-0xbf1ae000          32K     RW NX     MEM/CACHED/WBRA
root@...glebone:~# uname -a
Linux beaglebone 3.19.0-9-generic #9~RONXFIX SMP Tue Mar 24 10:34:39 UTC 2015
armv7l armv7l armv7l GNU/Linux
root@...glebone:~#

can you cc: stable@ ?
-- 
bye,
p.
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