linux-kernel - Re: [PATCH v2 0/6] powerpc/32s: Allocate modules outside of vmalloc space for STRICT_KERNEL

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Date:   Mon, 27 Jul 2020 17:26:45 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 0/6] powerpc/32s: Allocate modules outside of vmalloc space for STRICT_KERNEL_RWX

On Mon, 29 Jun 2020 11:15:19 +0000 (UTC), Christophe Leroy wrote:
> On book3s32 (hash), exec protection is set per 256Mb segments with NX bit.
> Instead of clearing NX bit on vmalloc space when CONFIG_MODULES is selected,
> allocate modules in a dedicated segment (0xb0000000-0xbfffffff by default).
> This allows to keep exec protection on vmalloc space while allowing exec
> on modules.
> 
> v2:
> - Removed the two patches that fix ptdump. Will submitted independently
> - Only changing the user/kernel boundary for PPC32 now.
> - Reordered the patches inside the series.
> 
> [...]

Applied to powerpc/next.

[1/6] powerpc/lib: Prepare code-patching for modules allocated outside vmalloc space
      https://git.kernel.org/powerpc/c/ccc8fcf72a6953fbfd6998999d622295f522b952
[2/6] powerpc: Use MODULES_VADDR if defined
      https://git.kernel.org/powerpc/c/7fbc22ce29931630da200cfc90fe5a454f54a794
[3/6] powerpc/32s: Only leave NX unset on segments used for modules
      https://git.kernel.org/powerpc/c/c496433197154144c310a17939736bc5c155914d
[4/6] powerpc/32: Set user/kernel boundary at TASK_SIZE instead of PAGE_OFFSET
      https://git.kernel.org/powerpc/c/b6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4
[5/6] powerpc/32s: Kernel space starts at TASK_SIZE
      https://git.kernel.org/powerpc/c/f1a1f7a15eb0e13b84791ff2738b84e414501718
[6/6] powerpc/32s: Use dedicated segment for modules with STRICT_KERNEL_RWX
      https://git.kernel.org/powerpc/c/6ca055322da8fe25ff9ac50db6f3b7b59b6f961c

cheers