linux-kernel - Re: [PATCH v4 0/8] arm: support CONFIG

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Date:	Wed, 13 Aug 2014 13:38:24 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Kees Cook <keescook@...omium.org>
cc:	linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Mark Salter <msalter@...hat.com>, Rabin Vincent <rabin@....in>,
	Liu hua <sdu.liu@...wei.com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Tomasz Figa <t.figa@...sung.com>,
	Doug Anderson <dianders@...gle.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 0/8] arm: support CONFIG_RODATA

On Wed, 13 Aug 2014, Kees Cook wrote:

> This is a series of patches to support CONFIG_RODATA on ARM, so that
> the kernel text is RO, and non-text sections default to NX. To support
> on-the-fly kernel text patching (via ftrace, kprobes, etc), fixmap
> support has been finalized based on several versions of various patches
> that are floating around on the mailing list. This series attempts to
> include the least intrusive version, so that others can build on it for
> future fixmap work.
> 
> The series has been heavily tested, and appears to be working correctly:
> 
> With CONFIG_ARM_PTDUMP, expected page table permissions are seen in
> /sys/kernel/debug/kernel_page_tables.
> 
> Using CONFIG_LKDTM, the kernel now correctly detects bad accesses for
> for the following lkdtm tests via /sys/kernel/debug/provoke-crash/DIRECT:
>         EXEC_DATA
>         WRITE_RO
>         WRITE_KERN
> 
> ftrace works:
>         CONFIG_FTRACE_STARTUP_TEST passes
>         Enabling tracing works:
>                 echo function > /sys/kernel/debug/tracing/current_tracer
> 
> kprobes works:
>         CONFIG_ARM_KPROBES_TEST passes
> 
> kexec works:
>         kexec will load and start a new kernel
> 
> Built with and without CONFIG_HIGHMEM, CONFIG_HIGHMEM_DEBUG, and
> CONFIG_NR_CPUS=32.
> 
> Thanks to everyone who has been testing this series and working on its
> various pieces!

For the whole series:

Acked-by: Nicolas Pitre <nico@...aro.org>



> 
> -Kees
> 
> v4:
> - expanded fixmap to 3MB to support 32 CPUs (robh)
> - corrected pmd-finding via vaddr instead of FIXMAP_START (robh)
> - switched structure size test to BUILD_BUG_ON (sboyd)
> - added locking annotations to keep sparse happy (sboyd)
> - adding missing "static" declarations noticed by sparse
> - reorganized fixmap portion of patches
> 
> v3:
> - more cleanups in switch to generic fixmap (lauraa, robh)
> - fixed kexec merge hunk glitch (will.deacon)
> - added tested-by tags where appropriate from v2 testing
> 
> v2:
> - fix typo in kexec merge (buildbot)
> - flip index order for highmem pte access (lauraa)
> - added kgdb updates (dianders)
> 
> 
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