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

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Date:   Mon, 29 Jun 2020 11:15:19 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 0/6] powerpc/32s: Allocate modules outside of vmalloc space for STRICT_KERNEL_RWX

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.

Christophe Leroy (6):
  powerpc/lib: Prepare code-patching for modules allocated outside
    vmalloc space
  powerpc: Use MODULES_VADDR if defined
  powerpc/32s: Only leave NX unset on segments used for modules
  powerpc/32: Set user/kernel boundary at TASK_SIZE instead of
    PAGE_OFFSET
  powerpc/32s: Kernel space starts at TASK_SIZE
  powerpc/32s: Use dedicated segment for modules with STRICT_KERNEL_RWX

 arch/powerpc/Kconfig                         |  1 +
 arch/powerpc/include/asm/book3s/32/pgtable.h | 15 +++++----------
 arch/powerpc/include/asm/page.h              |  4 +++-
 arch/powerpc/kernel/head_32.S                | 12 ++++++------
 arch/powerpc/kernel/module.c                 | 11 +++++++++++
 arch/powerpc/lib/code-patching.c             |  2 +-
 arch/powerpc/mm/book3s32/hash_low.S          |  2 +-
 arch/powerpc/mm/book3s32/mmu.c               | 17 ++++++++++++++---
 arch/powerpc/mm/kasan/kasan_init_32.c        |  6 ++++++
 arch/powerpc/mm/ptdump/ptdump.c              | 16 ++++++++++++++--
 10 files changed, 62 insertions(+), 24 deletions(-)

-- 
2.25.0