From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arne Fitzenreiter <arne_f@ipfire.org>
To: development@lists.ipfire.org
Subject: Re: [PATCH] kernel: enable CONFIG_GCC_PLUGIN_STACKLEAK
Date: Wed, 10 Jun 2020 16:48:10 +0200
Message-ID: <319464f1eaa5228b191c6cd742388713@ipfire.org>
In-Reply-To: <A170CED1-4CCA-4C05-8EA7-0D10B78D3C86@ipfire.org>
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This option not exist in kernel 4.14!!! It was added with kernel 5.2

Arne


Am 2020-06-10 10:28, schrieb Michael Tremer:
> Hi,
>=20
>> On 9 Jun 2020, at 18:53, Peter M=C3=BCller <peter.mueller(a)ipfire.org>=20
>> wrote:
>>=20
>> Quoted from=20
>> https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommen=
ded_Settings:
>>=20
>>> # Wipe stack contents on syscall exit (reduces stale data lifetime in=20
>>> stack)
>>> CONFIG_GCC_PLUGIN_STACKLEAK=3Dy
>>=20
>> Not sure what performance penalities this introduces in real life...
>=20
> Well, should we not find out before we make this generally available
> for all users?
>=20
> -Michael
>=20
>>=20
>> Fixes: #12382
>>=20
>> Cc: Arne Fitzenreiter <arne.fitzenreiter(a)ipfire.org>
>> Signed-off-by: Peter M=C3=BCller <peter.mueller(a)ipfire.org>
>> ---
>> config/kernel/kernel.config.aarch64-ipfire        | 1 +
>> config/kernel/kernel.config.armv5tel-ipfire-multi | 1 +
>> config/kernel/kernel.config.i586-ipfire           | 1 +
>> config/kernel/kernel.config.x86_64-ipfire         | 1 +
>> 4 files changed, 4 insertions(+)
>>=20
>> diff --git a/config/kernel/kernel.config.aarch64-ipfire=20
>> b/config/kernel/kernel.config.aarch64-ipfire
>> index e0f2f6df8..f4240e0ae 100644
>> --- a/config/kernel/kernel.config.aarch64-ipfire
>> +++ b/config/kernel/kernel.config.aarch64-ipfire
>> @@ -256,6 +256,7 @@ CONFIG_HAVE_GCC_PLUGINS=3Dy
>> CONFIG_GCC_PLUGINS=3Dy
>> # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
>> CONFIG_GCC_PLUGIN_LATENT_ENTROPY=3Dy
>> +CONFIG_GCC_PLUGIN_STACKLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=3Dy
>> # CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
>> diff --git a/config/kernel/kernel.config.armv5tel-ipfire-multi=20
>> b/config/kernel/kernel.config.armv5tel-ipfire-multi
>> index 15183300f..2bcfbdbdd 100644
>> --- a/config/kernel/kernel.config.armv5tel-ipfire-multi
>> +++ b/config/kernel/kernel.config.armv5tel-ipfire-multi
>> @@ -252,6 +252,7 @@ CONFIG_HAVE_GCC_PLUGINS=3Dy
>> CONFIG_GCC_PLUGINS=3Dy
>> # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
>> CONFIG_GCC_PLUGIN_LATENT_ENTROPY=3Dy
>> +CONFIG_GCC_PLUGIN_STACKLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=3Dy
>> # CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
>> diff --git a/config/kernel/kernel.config.i586-ipfire=20
>> b/config/kernel/kernel.config.i586-ipfire
>> index 578931497..a72cde41a 100644
>> --- a/config/kernel/kernel.config.i586-ipfire
>> +++ b/config/kernel/kernel.config.i586-ipfire
>> @@ -283,6 +283,7 @@ CONFIG_HAVE_GCC_PLUGINS=3Dy
>> CONFIG_GCC_PLUGINS=3Dy
>> # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
>> CONFIG_GCC_PLUGIN_LATENT_ENTROPY=3Dy
>> +CONFIG_GCC_PLUGIN_STACKLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=3Dy
>> # CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
>> diff --git a/config/kernel/kernel.config.x86_64-ipfire=20
>> b/config/kernel/kernel.config.x86_64-ipfire
>> index 6a5fbbfe9..cd116d780 100644
>> --- a/config/kernel/kernel.config.x86_64-ipfire
>> +++ b/config/kernel/kernel.config.x86_64-ipfire
>> @@ -293,6 +293,7 @@ CONFIG_HAVE_GCC_PLUGINS=3Dy
>> CONFIG_GCC_PLUGINS=3Dy
>> # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
>> CONFIG_GCC_PLUGIN_LATENT_ENTROPY=3Dy
>> +CONFIG_GCC_PLUGIN_STACKLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK=3Dy
>> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=3Dy
>> # CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
>> --
>> 2.26.2

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