Hi,
For patches to arm64, please CC the arm64 maintainers, and the
linux-arm-kernel mailing list.
Generally, please try to follow the guidance of
Documentation/process/submitting-patches.rst
e.g. you can use get_maintainer.pl to figure out who to Cc:
[mark@lakrids:~/src/linux]% ./scripts/get_maintainer.pl arch/arm64/mm/mmu.c
Catalin Marinas <catalin.mari...@arm.com> (maintainer:ARM64 PORT (AARCH64
ARCHITECTURE),commit_signer:8/16=50%)
Will Deacon <will.dea...@arm.com> (maintainer:ARM64 PORT (AARCH64
ARCHITECTURE),commit_signer:9/16=56%,authored:6/16=38%,added_lines:205/242=85%,removed_lines:142/157=90%)
Ard Biesheuvel <ard.biesheu...@linaro.org> (commit_signer:5/16=31%)
Marc Zyngier <marc.zyng...@arm.com> (commit_signer:4/16=25%)
Dan Williams <dan.j.willi...@intel.com> (commit_signer:2/16=12%)
Kristina Martsenko <kristina.martse...@arm.com> (authored:2/16=12%)
James Morse <james.mo...@arm.com> (authored:2/16=12%)
Tobias Klauser <tklau...@distanz.ch> (authored:1/16=6%)
Steve Capper <steve.cap...@arm.com> (authored:1/16=6%)
linux-arm-ker...@lists.infradead.org (moderated list:ARM64 PORT (AARCH64
ARCHITECTURE))
linux-kernel@vger.kernel.org (open list)
Thanks,
Mark.
On Tue, May 29, 2018 at 05:16:09PM +0800, YaoJun wrote:
> To prevent KSMA(Kernel Space Mirroring Attack), it's necessary
> to set tramp_pg_dir read-only after initialization.
>
> ---
> arch/arm64/mm/mmu.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 2dbb2c9f1ec1..964520e4e675 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -551,6 +551,9 @@ static int __init map_entry_trampoline(void)
> __create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS, PAGE_SIZE,
> prot, pgd_pgtable_alloc, 0);
>
> + update_mapping_prot(__pa_symbol(tramp_pg_dir), (unsigned
> long)tramp_pg_dir,
> + PGD_SIZE, PAGE_KERNEL_RO);
> +
> /* Map both the text and data into the kernel page table */
> __set_fixmap(FIX_ENTRY_TRAMP_TEXT, pa_start, prot);
> if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
> --
> 2.17.0
>
