Hello,

This is a configuration option only available from kernel 6.10 onwards.

*Please build* those changes that you are submitting and *test* them first. We don’t want to avoid any regressions for the sake of hardening tiny things. We need to collect evidence ourselves how these things perform for our use case.

-Michael

> On 21 Sep 2024, at 20:48, Peter Müller <peter.mueller(a)ipfire.org> wrote:
> 
> This feature is already supported by and enabled on all
> architectures we support, this patch ensures IPFire will
> always make use of it to rule out memory page tampering by
> userspace applications.
> 
> Signed-off-by: Peter Müller <peter.mueller(a)ipfire.org>
> ---
> config/kernel/kernel.config.aarch64-ipfire | 2 +-
> config/kernel/kernel.config.riscv64-ipfire | 2 +-
> config/kernel/kernel.config.x86_64-ipfire  | 2 +-
> config/rootfiles/common/aarch64/linux      | 1 +
> config/rootfiles/common/riscv64/linux      | 1 +
> config/rootfiles/common/x86_64/linux       | 1 +
> 6 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/config/kernel/kernel.config.aarch64-ipfire b/config/kernel/kernel.config.aarch64-ipfire
> index 74085de00..b7f64d10c 100644
> --- a/config/kernel/kernel.config.aarch64-ipfire
> +++ b/config/kernel/kernel.config.aarch64-ipfire
> @@ -8661,7 +8661,7 @@ CONFIG_PAGE_EXTENSION=y
> # CONFIG_SLUB_DEBUG is not set
> # CONFIG_PAGE_OWNER is not set
> CONFIG_PAGE_TABLE_CHECK=y
> -# CONFIG_PAGE_TABLE_CHECK_ENFORCED is not set
> +CONFIG_PAGE_TABLE_CHECK_ENFORCED=y
> # CONFIG_PAGE_POISONING is not set
> # CONFIG_DEBUG_PAGE_REF is not set
> # CONFIG_DEBUG_RODATA_TEST is not set
> diff --git a/config/kernel/kernel.config.riscv64-ipfire b/config/kernel/kernel.config.riscv64-ipfire
> index 451607c17..e186bb9a8 100644
> --- a/config/kernel/kernel.config.riscv64-ipfire
> +++ b/config/kernel/kernel.config.riscv64-ipfire
> @@ -7243,7 +7243,7 @@ CONFIG_PAGE_EXTENSION=y
> # CONFIG_SLUB_DEBUG is not set
> # CONFIG_PAGE_OWNER is not set
> CONFIG_PAGE_TABLE_CHECK=y
> -# CONFIG_PAGE_TABLE_CHECK_ENFORCED is not set
> +CONFIG_PAGE_TABLE_CHECK_ENFORCED=y
> CONFIG_PAGE_POISONING=y
> # CONFIG_DEBUG_PAGE_REF is not set
> # CONFIG_DEBUG_RODATA_TEST is not set
> diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/kernel.config.x86_64-ipfire
> index 6f0f1bfa5..de6f76ce7 100644
> --- a/config/kernel/kernel.config.x86_64-ipfire
> +++ b/config/kernel/kernel.config.x86_64-ipfire
> @@ -7800,7 +7800,7 @@ CONFIG_PAGE_EXTENSION=y
> # CONFIG_SLUB_DEBUG is not set
> # CONFIG_PAGE_OWNER is not set
> CONFIG_PAGE_TABLE_CHECK=y
> -# CONFIG_PAGE_TABLE_CHECK_ENFORCED is not set
> +CONFIG_PAGE_TABLE_CHECK_ENFORCED=y
> CONFIG_PAGE_POISONING=y
> # CONFIG_DEBUG_PAGE_REF is not set
> # CONFIG_DEBUG_RODATA_TEST is not set
> diff --git a/config/rootfiles/common/aarch64/linux b/config/rootfiles/common/aarch64/linux
> index 53dedd2f3..3c9760570 100644
> --- a/config/rootfiles/common/aarch64/linux
> +++ b/config/rootfiles/common/aarch64/linux
> @@ -10154,6 +10154,7 @@ etc/modprobe.d/ipv6.conf
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_256KB
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_64KB
> #lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK
> +#lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK_ENFORCED
> #lib/modules/KVER/build/include/config/PAHOLE_VERSION
> #lib/modules/KVER/build/include/config/PANIC_ON_OOPS_VALUE
> #lib/modules/KVER/build/include/config/PANIC_TIMEOUT
> diff --git a/config/rootfiles/common/riscv64/linux b/config/rootfiles/common/riscv64/linux
> index dca2c7370..578e0d9fb 100644
> --- a/config/rootfiles/common/riscv64/linux
> +++ b/config/rootfiles/common/riscv64/linux
> @@ -9249,6 +9249,7 @@ etc/modprobe.d/ipv6.conf
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_256KB
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_64KB
> #lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK
> +#lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK_ENFORCED
> #lib/modules/KVER/build/include/config/PAHOLE_VERSION
> #lib/modules/KVER/build/include/config/PANIC_ON_OOPS_VALUE
> #lib/modules/KVER/build/include/config/PANIC_TIMEOUT
> diff --git a/config/rootfiles/common/x86_64/linux b/config/rootfiles/common/x86_64/linux
> index cecaf36fa..2469ad645 100644
> --- a/config/rootfiles/common/x86_64/linux
> +++ b/config/rootfiles/common/x86_64/linux
> @@ -9922,6 +9922,7 @@ etc/modprobe.d/ipv6.conf
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_256KB
> #lib/modules/KVER/build/include/config/PAGE_SIZE_LESS_THAN_64KB
> #lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK
> +#lib/modules/KVER/build/include/config/PAGE_TABLE_CHECK_ENFORCED
> #lib/modules/KVER/build/include/config/PAGE_TABLE_ISOLATION
> #lib/modules/KVER/build/include/config/PAHOLE_VERSION
> #lib/modules/KVER/build/include/config/PANASONIC_LAPTOP
> -- 
> 2.39.5
>