[d-kernel] [PATCH 2/6] security: lockdown: expose security_lock_kernel_down function

[Egor Ignatov]

On 5/9/26 3:20 AM, Vitaly Chikunov wrote:
> On Wed, May 06, 2026 at 08:37:18PM +0300, Egor Ignatov wrote:
>> From: Jeremy Cline <jcline at redhat.com>
>>
>> In order to automatically lock down kernels running on UEFI machines
>> booted in Secure Boot mode, expose the security_lock_kernel_down() function.
>>
>> Based on Fedora patches:
>> - security: lockdown: expose a hook to lock the kernel down
>> - efi,lockdown: fix kernel lockdown on Secure Boot
> 
> Но, у второго патча автор Ondrej Mosnacek, а мы скорее берем его
> изменения, а не из первого патча.
> 
> Кроме того, тэг `Signed-off-by` не укатает на авторство.
> 
> Может лучше указать во From себя, но добавить:
> 
>    Based-on-a-patch-by: Jeremy Cline <jcline at redhat.com>
>    Based-on-a-patch-by: Ondrej Mosnacek <omosnace at redhat.com>
> 
> Такое есть в ядре, хоть и редко.

Хорошо, так и сделаю.

>>
>> Signed-off-by: Jeremy Cline <jcline at redhat.com>
>> Signed-off-by: Ondrej Mosnacek <omosnace at redhat.com>
>> Signed-off-by: Egor Ignatov <egori at altlinux.org>
>> ---
>>   include/linux/security.h     |  9 +++++++++
>>   security/lockdown/lockdown.c | 11 +++++++++++
>>   2 files changed, 20 insertions(+)
>>
>> diff --git a/include/linux/security.h b/include/linux/security.h
>> index ee88dd2d2d..5c816f0b8b 100644
>> --- a/include/linux/security.h
>> +++ b/include/linux/security.h
>> @@ -2405,4 +2405,13 @@ static inline void security_initramfs_populated(void)
>>   }
>>   #endif /* CONFIG_SECURITY */
>>   
>> +#ifdef CONFIG_SECURITY_LOCKDOWN_LSM
>> +extern int security_lock_kernel_down(const char *where, enum lockdown_reason level);
>> +#else
>> +static inline int security_lock_kernel_down(const char *where, enum lockdown_reason level)
>> +{
>> +	return 0;
>> +}
>> +#endif /* CONFIG_SECURITY_LOCKDOWN_LSM */
>> +
>>   #endif /* ! __LINUX_SECURITY_H */
>> diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
>> index 8d46886d2c..14a9cdff94 100644
>> --- a/security/lockdown/lockdown.c
>> +++ b/security/lockdown/lockdown.c
>> @@ -72,6 +72,17 @@ static int lockdown_is_locked_down(enum lockdown_reason what)
>>   	return 0;
>>   }
>>   
>> +/**
>> + * security_lock_kernel_down() - Put the kernel into lock-down mode.
>> + *
>> + * @where: Where the lock-down is originating from (e.g. command line option)
>> + * @level: The lock-down level (can only increase)
>> + */
>> +int security_lock_kernel_down(const char *where, enum lockdown_reason level)
>> +{
>> +	return lock_kernel_down(where, level);
>> +}
>> +
>>   static struct security_hook_list lockdown_hooks[] __ro_after_init = {
>>   	LSM_HOOK_INIT(locked_down, lockdown_is_locked_down),
>>   };
>> -- 
>> 2.50.1
>>
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-- 
Egor Ignatov
ALT Linux Team