Re: [PATCH v2] arch, mm: promote DEBUG_WX to CHECK_WX

[sashiko-bot@kernel.org]

> Verification that the kernel does not have writable + executable
> mappings is about detecting security risks rather than a pure debug
> feature.
> 
> Major distribution configurations enable it in their kernels as well as
> defconfigs of most architectures that have ARCH_HAS_DEBUG_WX.
> 
> Rename relevant generic configuration options to use CHECK_WX and move
> their definitions from mm/Kconfig.debug to mm/Kconfig.
> 
> Rename *debug_checkwx() funcitons and macros to *pgtable_checkwx().
> 
> For arm that does not widely enable it, only rename its variants of the
> config options.
> 
> Enabling CHECK_WX adds a few kilobytes to the kernel binary and while
> the added size can be slightly reduced with churny updates of
> architecture implementations of ptdump, the core functionality takes
> most of the added size. It cannot be moved to .init.text because the
> verification has to happen after init sections are freed.
> 
> With this, make generic CHECK_WX default to STRICT_KERNEL_RWX while
> still leaving users targeting small kernels the possibility to opt-out.
> 
> Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260926-direct-map-verify-wx-v2-1-efcd64a6b74a@kernel.org?part=1