linux-kernel - Re: [PATCH RESEND v2 0/2] riscv: Fix set_memory_XX() and set_direct_map

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Date:   Wed, 08 Nov 2023 17:20:24 +0000
From:   patchwork-bot+linux-riscv@...nel.org
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     linux-riscv@...ts.infradead.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, rppt@...nel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2 0/2] riscv: Fix set_memory_XX() and
 set_direct_map_XX()

Hello:

This series was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@...osinc.com>:

On Wed,  8 Nov 2023 08:59:28 +0100 you wrote:
> Those 2 patches fix the set_memory_XX() and set_direct_map_XX() APIs, which
> in turn fix STRICT_KERNEL_RWX and memfd_secret(). Those were broken since the
> permission changes were not applied to the linear mapping because the linear
> mapping is mapped using hugepages and walk_page_range_novma() does not split
> such mappings.
> 
> To fix that, patch 1 disables PGD mappings in the linear mapping as it is
> hard to propagate changes at this level in *all* the page tables, this has the
> downside of disabling PMD mapping for sv32 and PUD (1GB) mapping for sv39 in
> the linear mapping (for specific kernels, we could add a Kconfig to enable
> ARCH_HAS_SET_DIRECT_MAP and STRICT_KERNEL_RWX if needed, I'm pretty sure we'll
> discuss that).
> 
> [...]

Here is the summary with links:
  - [RESEND,v2,1/2] riscv: Don't use PGD entries for the linear mapping
    https://git.kernel.org/riscv/c/629db01c64ff
  - [RESEND,v2,2/2] riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings
    https://git.kernel.org/riscv/c/311cd2f6e253

You are awesome, thank you!
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