From: Alexandre Ghiti <alexghiti@rivosinc.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Ard Biesheuvel <ardb@kernel.org>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v3 0/5] riscv: Introduce KASLR
Date: Tue, 6 Jun 2023 14:32:37 +0200 [thread overview]
Message-ID: <20230606123242.20804-1-alexghiti@rivosinc.com> (raw)
The following KASLR implementation allows to randomize the kernel mapping:
- virtually: we expect the bootloader to provide a seed in the device-tree
- physically: only implemented in the EFI stub, it relies on the firmware to
provide a seed using EFI_RNG_PROTOCOL. arm64 has a similar implementation
hence the patch 3 factorizes KASLR related functions for riscv to take
advantage.
The new virtual kernel location is limited by the early page table that only
has one PUD and with the PMD alignment constraint, the kernel can only take
< 512 positions.
base-commit-tag: v6.4-rc2
Changes in v3:
* Rebase on top of 6.4-rc2
* Make RANDOMIZE_BASE depend on 64bit
* Fix efi_icache_sync and efi_get_kimg_min_align which were undefined
in x86 (and certainly other archs)
* Add patch 4 to fix warning on rv32
Changes in v2:
* Rebase on top of 6.3-rc1
* Add a riscv cache sync after memcpying the kernel
* Add kaslr_offset implementation for KCOV
* Add forward declaration to quiet LLVM
Alexandre Ghiti (5):
riscv: Introduce virtual kernel mapping KASLR
riscv: Dump out kernel offset information on panic
arm64: libstub: Move KASLR handling functions to efi-stub-helper.c
libstub: Fix compilation warning for rv32
riscv: libstub: Implement KASLR by using generic functions
arch/arm64/include/asm/efi.h | 4 +
arch/riscv/Kconfig | 19 +++
arch/riscv/include/asm/efi.h | 4 +
arch/riscv/include/asm/page.h | 3 +
arch/riscv/kernel/image-vars.h | 1 +
arch/riscv/kernel/pi/Makefile | 2 +-
arch/riscv/kernel/pi/cmdline_early.c | 13 ++
arch/riscv/kernel/pi/fdt_early.c | 30 ++++
arch/riscv/kernel/setup.c | 25 +++
arch/riscv/mm/init.c | 36 ++++-
drivers/firmware/efi/libstub/arm64-stub.c | 112 +------------
drivers/firmware/efi/libstub/arm64.c | 5 +
.../firmware/efi/libstub/efi-stub-helper.c | 151 ++++++++++++++++++
drivers/firmware/efi/libstub/efistub.h | 18 +++
drivers/firmware/efi/libstub/riscv-stub.c | 28 ++--
drivers/firmware/efi/libstub/riscv.c | 5 +
16 files changed, 332 insertions(+), 124 deletions(-)
create mode 100644 arch/riscv/kernel/pi/fdt_early.c
--
2.39.2
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next reply other threads:[~2023-06-06 12:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-06 12:32 Alexandre Ghiti [this message]
2023-06-06 12:32 ` [PATCH v3 1/5] riscv: Introduce virtual kernel mapping KASLR Alexandre Ghiti
2023-06-06 12:32 ` [PATCH v3 2/5] riscv: Dump out kernel offset information on panic Alexandre Ghiti
2023-06-06 12:32 ` [PATCH v3 3/5] arm64: libstub: Move KASLR handling functions to efi-stub-helper.c Alexandre Ghiti
2023-06-07 6:11 ` kernel test robot
2023-06-07 23:54 ` kernel test robot
2023-06-06 12:32 ` [PATCH v3 4/5] libstub: Fix compilation warning for rv32 Alexandre Ghiti
2023-06-06 12:32 ` [PATCH v3 5/5] riscv: libstub: Implement KASLR by using generic functions Alexandre Ghiti
2023-06-22 0:09 ` [PATCH v3 0/5] riscv: Introduce KASLR Palmer Dabbelt
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