From: Atish Patra <atish.patra@wdc.com>
To: linux-kernel@vger.kernel.org
Cc: Albert Ou <aou@eecs.berkeley.edu>,
Kees Cook <keescook@chromium.org>,
Anup Patel <anup@brainfault.org>,
linux-riscv@lists.infradead.org,
Atish Patra <atish.patra@wdc.com>,
Palmer Dabbelt <palmer@dabbelt.com>, Zong Li <zong.li@sifive.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Greentime Hu <greentime.hu@sifive.com>,
Andrew Morton <akpm@linux-foundation.org>,
Borislav Petkov <bp@suse.de>,
Michel Lespinasse <walken@google.com>,
Ard Biesheuvel <ardb@kernel.org>, Mike Rapoport <rppt@kernel.org>
Subject: [PATCH v2 0/6] Improve kernel section protections
Date: Mon, 26 Oct 2020 16:02:48 -0700 [thread overview]
Message-ID: <20201026230254.911912-1-atish.patra@wdc.com> (raw)
This series aims at improving kernel permissions by doing following things.
1. Protect kernel sections early instead of after /init.
2. Protect .init.text & .init.data sections with appropriate permissions.
3. Move dynamic relocation section to _init.
4. Moved .init sections after .text. This is what most of the other archs
are also doing.
After applying this patch, here are the linear mapped sections.
---[ Linear mapping ]---
0xffffffe000000000-0xffffffe000800000 0x0000000080200000 8M PMD D A . . X . R V
0xffffffe000800000-0xffffffe000c00000 0x0000000080a00000 4M PMD D A . . . W R V
0xffffffe000c00000-0xffffffe001200000 0x0000000080e00000 6M PMD D A . . . . R V
0xffffffe001200000-0xffffffe03fe00000 0x0000000081400000 1004M PMD D A . . . W R V
Changes from v1->v2:
1. .init.text section is aligned with SECTION_ALIGN.
2. .init.text is moved to below of .text so that .head.text & .text are in
one section.
3. We don't need Guo's fix for static object issue.
4. Rebased on 5.10-rc1.
Atish Patra (6):
RISC-V: Move __start_kernel to .head.text
RISC-V: Initialize SBI early
RISC-V: Enforce protections for kernel sections early
RISC-V: Align the .init.text section
RISC-V: Protect .init.text & .init.data
RISC-V: Move dynamic relocation section under __init
arch/riscv/include/asm/sections.h | 2 +
arch/riscv/include/asm/set_memory.h | 4 ++
arch/riscv/kernel/head.S | 1 -
arch/riscv/kernel/setup.c | 18 +++++++--
arch/riscv/kernel/vmlinux.lds.S | 63 +++++++++++++++++------------
arch/riscv/mm/init.c | 19 +++++++--
arch/riscv/mm/pageattr.c | 6 +++
7 files changed, 79 insertions(+), 34 deletions(-)
--
2.25.1
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next reply other threads:[~2020-10-26 23:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 23:02 Atish Patra [this message]
2020-10-26 23:02 ` [PATCH v2 1/6] RISC-V: Move __start_kernel to .head.text Atish Patra
2020-10-26 23:02 ` [PATCH v2 2/6] RISC-V: Initialize SBI early Atish Patra
2020-10-27 10:04 ` Mike Rapoport
2020-10-27 18:38 ` Atish Patra
2020-10-26 23:02 ` [PATCH v2 3/6] RISC-V: Enforce protections for kernel sections early Atish Patra
2020-10-27 10:00 ` Mike Rapoport
2020-10-27 18:38 ` Atish Patra
2020-10-26 23:02 ` [PATCH v2 4/6] RISC-V: Align the .init.text section Atish Patra
2020-10-26 23:02 ` [PATCH v2 5/6] RISC-V: Protect .init.text & .init.data Atish Patra
2020-10-27 10:45 ` Mike Rapoport
2020-10-29 19:21 ` Atish Patra
2020-10-30 8:49 ` Mike Rapoport
2020-10-30 20:29 ` Atish Patra
2020-10-26 23:02 ` [PATCH v2 6/6] RISC-V: Move dynamic relocation section under __init Atish Patra
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