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Date: Wed, 23 Dec 2015 16:45:16 -0500 (EST)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Tony Lindgren <tony@...mide.com>
cc: Laura Abbott <labbott@...hat.com>, Kees Cook <keescook@...omium.org>,
Russell King <linux@....linux.org.uk>, Arnd Bergmann <arnd@...db.de>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>, LKML <linux-kernel@...r.kernel.org>,
Linux-MM <linux-mm@...ck.org>, kernel-hardening@...ts.openwall.com,
linux-arm-kernel@...ts.infradead.org,
Laura Abbott <labbott@...oraproject.org>
Subject: Re: [PATCH v2] ARM: mm: flip priority of CONFIG_DEBUG_RODATA
On Wed, 23 Dec 2015, Tony Lindgren wrote:
> Hi,
>
> * Laura Abbott <labbott@...hat.com> [151223 12:31]:
> >
> > Looks like a case similar to Geert's
> >
> > adr r7, kick_counter
> > wait_dll_lock_timed:
> > ldr r4, wait_dll_lock_counter
> > add r4, r4, #1
> > str r4, [r7, #wait_dll_lock_counter - kick_counter]
> > ldr r4, sdrc_dlla_status
> > /* Wait 20uS for lock */
> > mov r6, #8
> >
> >
> > kick_counter and wait_dll_lock_counter are in the text section which is marked read only.
> > They need to be moved to the data section along with a few other variables from what I
> > can tell (maybe those are read only?).
>
> Thanks for looking, yeah so it seem.
>
> > I suspect this is going to be a common issue with suspend/resume code paths since those
> > are hand written assembly.
>
> Yes I suspect we have quite a few cases like this.
We fixed a bunch of similar issues where code was located in the .data
section for ease of use from assembly code. See commit b4e61537 and
d0776aff for example.
Nicolas
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