From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter =?utf-8?q?M=C3=BCller?= <peter.mueller@ipfire.org>
To: development@lists.ipfire.org
Subject: Re: [PATCH] Kernel: Enable YAMA support
Date: Wed, 29 Jun 2022 20:09:46 +0000
Message-ID: <f33549d0-e94f-afd8-0232-6b96bf25eb82@ipfire.org>
In-Reply-To: <5CF05F78-6831-41B4-94E0-A1044C111BA5@ipfire.org>
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Hello Michael,

thank you for reporting this.

Commit 5086ed681da4784474f0f71aaa70ec1d4940897c resolves the issue. As the sy=
sctl value
cannot be decreased once it has been set to "3" (one of the few times where L=
inux seems
to actually show a mature approach to security by default), a reboot is requi=
red to apply
the change.

Thanks, and best regards,
Peter M=C3=BCller


> I believe this stops strace from working. See screenshot.
>=20
> If I remember our conversation correctly, this should have worked for root.=
 Is my assumption correct?
>=20
> -Michael
>=20
>=20
>=20
>> On 13 Jun 2022, at 14:31, Michael Tremer <michael.tremer(a)ipfire.org> wro=
te:
>>
>> Reviewed-by: Michael Tremer <michael.tremer(a)ipfire.org>
>>
>>> On 11 Jun 2022, at 19:53, Peter M=C3=BCller <peter.mueller(a)ipfire.org> =
wrote:
>>>
>>> See https://www.kernel.org/doc/html/latest/admin-guide/LSM/Yama.html for
>>> the upstream rationale. Enabling YAMA gives us the benefit of additional
>>> hardening options available, without any obvious downsides.
>>>
>>> Signed-off-by: Peter M=C3=BCller <peter.mueller(a)ipfire.org>
>>> ---
>>> config/kernel/kernel.config.aarch64-ipfire | 2 +-
>>> config/kernel/kernel.config.armv6l-ipfire  | 2 +-
>>> config/kernel/kernel.config.riscv64-ipfire | 2 +-
>>> config/kernel/kernel.config.x86_64-ipfire  | 2 +-
>>> 4 files changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/config/kernel/kernel.config.aarch64-ipfire b/config/kernel/k=
ernel.config.aarch64-ipfire
>>> index 6dfeae595..7e63b77ca 100644
>>> --- a/config/kernel/kernel.config.aarch64-ipfire
>>> +++ b/config/kernel/kernel.config.aarch64-ipfire
>>> @@ -7555,7 +7555,7 @@ CONFIG_FORTIFY_SOURCE=3Dy
>>> # CONFIG_SECURITY_TOMOYO is not set
>>> # CONFIG_SECURITY_APPARMOR is not set
>>> # CONFIG_SECURITY_LOADPIN is not set
>>> -# CONFIG_SECURITY_YAMA is not set
>>> +CONFIG_SECURITY_YAMA=3Dy
>>> # CONFIG_SECURITY_SAFESETID is not set
>>> CONFIG_SECURITY_LOCKDOWN_LSM=3Dy
>>> CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=3Dy
>>> diff --git a/config/kernel/kernel.config.armv6l-ipfire b/config/kernel/ke=
rnel.config.armv6l-ipfire
>>> index 1bb745a87..1b6440b11 100644
>>> --- a/config/kernel/kernel.config.armv6l-ipfire
>>> +++ b/config/kernel/kernel.config.armv6l-ipfire
>>> @@ -7561,7 +7561,7 @@ CONFIG_HARDENED_USERCOPY_PAGESPAN=3Dy
>>> # CONFIG_SECURITY_TOMOYO is not set
>>> # CONFIG_SECURITY_APPARMOR is not set
>>> # CONFIG_SECURITY_LOADPIN is not set
>>> -# CONFIG_SECURITY_YAMA is not set
>>> +CONFIG_SECURITY_YAMA=3Dy
>>> # CONFIG_SECURITY_SAFESETID is not set
>>> CONFIG_SECURITY_LOCKDOWN_LSM=3Dy
>>> CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=3Dy
>>> diff --git a/config/kernel/kernel.config.riscv64-ipfire b/config/kernel/k=
ernel.config.riscv64-ipfire
>>> index 2d1fdbd28..2d6bb3a2c 100644
>>> --- a/config/kernel/kernel.config.riscv64-ipfire
>>> +++ b/config/kernel/kernel.config.riscv64-ipfire
>>> @@ -6193,7 +6193,7 @@ CONFIG_FORTIFY_SOURCE=3Dy
>>> # CONFIG_SECURITY_TOMOYO is not set
>>> # CONFIG_SECURITY_APPARMOR is not set
>>> # CONFIG_SECURITY_LOADPIN is not set
>>> -# CONFIG_SECURITY_YAMA is not set
>>> +CONFIG_SECURITY_YAMA=3Dy
>>> # CONFIG_SECURITY_SAFESETID is not set
>>> CONFIG_SECURITY_LOCKDOWN_LSM=3Dy
>>> CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=3Dy
>>> diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/ke=
rnel.config.x86_64-ipfire
>>> index b84698235..0efe14c41 100644
>>> --- a/config/kernel/kernel.config.x86_64-ipfire
>>> +++ b/config/kernel/kernel.config.x86_64-ipfire
>>> @@ -6971,7 +6971,7 @@ CONFIG_FORTIFY_SOURCE=3Dy
>>> # CONFIG_SECURITY_TOMOYO is not set
>>> # CONFIG_SECURITY_APPARMOR is not set
>>> # CONFIG_SECURITY_LOADPIN is not set
>>> -# CONFIG_SECURITY_YAMA is not set
>>> +CONFIG_SECURITY_YAMA=3Dy
>>> # CONFIG_SECURITY_SAFESETID is not set
>>> CONFIG_SECURITY_LOCKDOWN_LSM=3Dy
>>> CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=3Dy
>>> --=20
>>> 2.35.3
>>
>=20
>=20

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