kernel: Enable Landlock support

  From the kernel's documentation:

> Landlock is a sandboxing mechanism that enables processes to restrict
> themselves (and their future children) by gradually enforcing
> tailored access control policies. A Landlock security policy is a
> set of access rights (e.g. open a file in read-only, make a
> directory, etc.) tied to a file hierarchy. Such policy can be
> configured and enforced by any processes for themselves using the
> dedicated system calls: landlock_create_ruleset(),
> landlock_add_rule(), and landlock_restrict_self().

There is no harm in enabling this security feature, so applications
supporting Landlock can benefit from it.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
---
 config/kernel/kernel.config.aarch64-ipfire | 4 ++--
 config/kernel/kernel.config.armv6l-ipfire  | 4 ++--
 config/kernel/kernel.config.x86_64-ipfire  | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)
  

Hello Peter,

> On 3 Nov 2022, at 15:10, Peter Müller <peter.mueller@ipfire.org> wrote:
> 
> From the kernel's documentation:
> 
>> Landlock is a sandboxing mechanism that enables processes to restrict
>> themselves (and their future children) by gradually enforcing
>> tailored access control policies. A Landlock security policy is a
>> set of access rights (e.g. open a file in read-only, make a
>> directory, etc.) tied to a file hierarchy. Such policy can be
>> configured and enforced by any processes for themselves using the
>> dedicated system calls: landlock_create_ruleset(),
>> landlock_add_rule(), and landlock_restrict_self().
> 
> There is no harm in enabling this security feature, so applications
> supporting Landlock can benefit from it.

Agreed.

Do we know of any applications that make use of this?

-Michael

Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>

> 
> Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
> ---
> config/kernel/kernel.config.aarch64-ipfire | 4 ++--
> config/kernel/kernel.config.armv6l-ipfire  | 4 ++--
> config/kernel/kernel.config.x86_64-ipfire  | 4 ++--
> 3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/config/kernel/kernel.config.aarch64-ipfire b/config/kernel/kernel.config.aarch64-ipfire
> index 63dc80d4a..4935dbc85 100644
> --- a/config/kernel/kernel.config.aarch64-ipfire
> +++ b/config/kernel/kernel.config.aarch64-ipfire
> @@ -7569,7 +7569,7 @@ CONFIG_SECURITY_DMESG_RESTRICT=y
> CONFIG_SECURITY=y
> CONFIG_SECURITYFS=y
> # CONFIG_SECURITY_NETWORK is not set
> -# CONFIG_SECURITY_PATH is not set
> +CONFIG_SECURITY_PATH=y
> CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
> CONFIG_HARDENED_USERCOPY=y
> CONFIG_HARDENED_USERCOPY_FALLBACK=y
> @@ -7587,7 +7587,7 @@ CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y
> CONFIG_LOCK_DOWN_KERNEL_FORCE_NONE=y
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY is not set
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY is not set
> -# CONFIG_SECURITY_LANDLOCK is not set
> +CONFIG_SECURITY_LANDLOCK=y
> CONFIG_INTEGRITY=y
> # CONFIG_INTEGRITY_SIGNATURE is not set
> # CONFIG_IMA is not set
> diff --git a/config/kernel/kernel.config.armv6l-ipfire b/config/kernel/kernel.config.armv6l-ipfire
> index 54260aec1..ad79cb22f 100644
> --- a/config/kernel/kernel.config.armv6l-ipfire
> +++ b/config/kernel/kernel.config.armv6l-ipfire
> @@ -7547,7 +7547,7 @@ CONFIG_SECURITY_DMESG_RESTRICT=y
> CONFIG_SECURITY=y
> CONFIG_SECURITYFS=y
> # CONFIG_SECURITY_NETWORK is not set
> -# CONFIG_SECURITY_PATH is not set
> +CONFIG_SECURITY_PATH=y
> CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
> CONFIG_HARDENED_USERCOPY=y
> CONFIG_HARDENED_USERCOPY_FALLBACK=y
> @@ -7565,7 +7565,7 @@ CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y
> CONFIG_LOCK_DOWN_KERNEL_FORCE_NONE=y
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY is not set
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY is not set
> -# CONFIG_SECURITY_LANDLOCK is not set
> +CONFIG_SECURITY_LANDLOCK=y
> CONFIG_INTEGRITY=y
> # CONFIG_INTEGRITY_SIGNATURE is not set
> # CONFIG_IMA is not set
> diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/kernel.config.x86_64-ipfire
> index bb4655a99..bef0b900e 100644
> --- a/config/kernel/kernel.config.x86_64-ipfire
> +++ b/config/kernel/kernel.config.x86_64-ipfire
> @@ -6944,7 +6944,7 @@ CONFIG_SECURITY_DMESG_RESTRICT=y
> CONFIG_SECURITY=y
> CONFIG_SECURITYFS=y
> # CONFIG_SECURITY_NETWORK is not set
> -# CONFIG_SECURITY_PATH is not set
> +CONFIG_SECURITY_PATH=y
> # CONFIG_INTEL_TXT is not set
> CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
> CONFIG_HARDENED_USERCOPY=y
> @@ -6963,7 +6963,7 @@ CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y
> CONFIG_LOCK_DOWN_KERNEL_FORCE_NONE=y
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY is not set
> # CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY is not set
> -# CONFIG_SECURITY_LANDLOCK is not set
> +CONFIG_SECURITY_LANDLOCK=y
> CONFIG_INTEGRITY=y
> # CONFIG_INTEGRITY_SIGNATURE is not set
> # CONFIG_IMA is not set
> -- 
> 2.35.3