From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v1 0/8] powerpc/32s: Allocate modules outside of vmalloc space for STRICT_KERNEL_RWX
Date: Fri, 19 Jun 2020 15:06:50 +0000 (UTC) [thread overview]
Message-ID: <cover.1592578278.git.christophe.leroy@csgroup.eu> (raw)
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.
Christophe Leroy (8):
powerpc/ptdump: Refactor update of st->last_pa
powerpc/ptdump: Refactor update of pg_state
powerpc: Set user/kernel boundary at TASK_SIZE instead of PAGE_OFFSET
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/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 | 2 +-
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 | 53 ++++++++++++--------
10 files changed, 78 insertions(+), 43 deletions(-)
--
2.25.0
next reply other threads:[~2020-06-19 15:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 15:06 Christophe Leroy [this message]
2020-06-19 15:06 ` [PATCH v1 1/8] powerpc/ptdump: Refactor update of st->last_pa Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 2/8] powerpc/ptdump: Refactor update of pg_state Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 3/8] powerpc: Set user/kernel boundary at TASK_SIZE instead of PAGE_OFFSET Christophe Leroy
2020-06-20 11:25 ` kernel test robot
2020-06-20 11:33 ` kernel test robot
2020-06-19 15:06 ` [PATCH v1 4/8] powerpc/lib: Prepare code-patching for modules allocated outside vmalloc space Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 5/8] powerpc: Use MODULES_VADDR if defined Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 6/8] powerpc/32s: Only leave NX unset on segments used for modules Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 7/8] powerpc/32s: Kernel space starts at TASK_SIZE Christophe Leroy
2020-06-19 15:06 ` [PATCH v1 8/8] powerpc/32s: Use dedicated segment for modules with STRICT_KERNEL_RWX Christophe Leroy
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