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[PATCH 2/3] arch/x86: Add <asm/ima-efi.h> for arch_ima_efi_boot_mode

Thomas Zimmermann posted 3 patches 2 years ago
There is a newer version of this series
[PATCH 2/3] arch/x86: Add <asm/ima-efi.h> for arch_ima_efi_boot_mode
Posted by Thomas Zimmermann 2 years ago 
The header file <asm/efi.h> contains the macro arch_ima_efi_boot_mode,
which expands to use struct boot_params from <asm/bootparams.h>. Many
drivers include <linux/efi.h>, but do not use boot parameters. Changes
to bootparam.h or its included headers can easily trigger large,
unnessary rebuilds of the kernel.

Moving x86's arch_ima_efi_boot_mode to <asm/ima-efi.h> and including
<asm/bootparam.h> separates that dependency from the rest of the EFI
interfaces. The only user is in ima_efi.c. As the file already declares
a default value for arch_ima_efi_boot_mode, move this define into
asm-generic for all other architectures.

With arch_ima_efi_boot_mode removed from efi.h, <asm/bootparam.h> can
later be removed from further x86 header files.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 arch/x86/include/asm/efi.h       |  3 ---
 arch/x86/include/asm/ima-efi.h   | 12 ++++++++++++
 include/asm-generic/Kbuild       |  1 +
 include/asm-generic/ima-efi.h    | 16 ++++++++++++++++
 security/integrity/ima/ima_efi.c |  5 +----
 5 files changed, 30 insertions(+), 7 deletions(-)
 create mode 100644 arch/x86/include/asm/ima-efi.h
 create mode 100644 include/asm-generic/ima-efi.h

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index c4555b269a1b..99f31176c892 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -418,9 +418,6 @@ extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
 extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
 				     void *buf, struct efi_mem_range *mem);
 
-#define arch_ima_efi_boot_mode	\
-	({ extern struct boot_params boot_params; boot_params.secure_boot; })
-
 #ifdef CONFIG_EFI_RUNTIME_MAP
 int efi_get_runtime_map_size(void);
 int efi_get_runtime_map_desc_size(void);
diff --git a/arch/x86/include/asm/ima-efi.h b/arch/x86/include/asm/ima-efi.h
new file mode 100644
index 000000000000..3fe054937077
--- /dev/null
+++ b/arch/x86/include/asm/ima-efi.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_IMA_EFI_H
+#define _ASM_X86_IMA_EFI_H
+
+#include <asm/bootparam.h>
+
+#define arch_ima_efi_boot_mode	\
+	({ extern struct boot_params boot_params; boot_params.secure_boot; })
+
+#include <asm-generic/ima-efi.h>
+
+#endif /* _ASM_X86_IMA_EFI_H */
diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
index def242528b1d..4fd16e71e8cd 100644
--- a/include/asm-generic/Kbuild
+++ b/include/asm-generic/Kbuild
@@ -26,6 +26,7 @@ mandatory-y += ftrace.h
 mandatory-y += futex.h
 mandatory-y += hardirq.h
 mandatory-y += hw_irq.h
+mandatory-y += ima-efi.h
 mandatory-y += io.h
 mandatory-y += irq.h
 mandatory-y += irq_regs.h
diff --git a/include/asm-generic/ima-efi.h b/include/asm-generic/ima-efi.h
new file mode 100644
index 000000000000..f87f5edef440
--- /dev/null
+++ b/include/asm-generic/ima-efi.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __ASM_GENERIC_IMA_EFI_H_
+#define __ASM_GENERIC_IMA_EFI_H_
+
+#include <linux/efi.h>
+
+/*
+ * Only include this header file from your architecture's <asm/ima-efi.h>.
+ */
+
+#ifndef arch_ima_efi_boot_mode
+#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
+#endif
+
+#endif /* __ASM_GENERIC_FB_H_ */
diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c
index 138029bfcce1..56bbee271cec 100644
--- a/security/integrity/ima/ima_efi.c
+++ b/security/integrity/ima/ima_efi.c
@@ -6,10 +6,7 @@
 #include <linux/module.h>
 #include <linux/ima.h>
 #include <asm/efi.h>
-
-#ifndef arch_ima_efi_boot_mode
-#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
-#endif
+#include <asm/ima-efi.h>
 
 static enum efi_secureboot_mode get_sb_mode(void)
 {
-- 
2.43.0
Re: [PATCH 2/3] arch/x86: Add <asm/ima-efi.h> for arch_ima_efi_boot_mode
Posted by Ard Biesheuvel 2 years ago 
On Wed, 6 Dec 2023 at 13:54, Thomas Zimmermann <tzimmermann@suse.de> wrote:
>
> The header file <asm/efi.h> contains the macro arch_ima_efi_boot_mode,
> which expands to use struct boot_params from <asm/bootparams.h>. Many
> drivers include <linux/efi.h>, but do not use boot parameters. Changes
> to bootparam.h or its included headers can easily trigger large,
> unnessary rebuilds of the kernel.
>
> Moving x86's arch_ima_efi_boot_mode to <asm/ima-efi.h> and including
> <asm/bootparam.h> separates that dependency from the rest of the EFI
> interfaces. The only user is in ima_efi.c. As the file already declares
> a default value for arch_ima_efi_boot_mode, move this define into
> asm-generic for all other architectures.
>
> With arch_ima_efi_boot_mode removed from efi.h, <asm/bootparam.h> can
> later be removed from further x86 header files.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  arch/x86/include/asm/efi.h       |  3 ---
>  arch/x86/include/asm/ima-efi.h   | 12 ++++++++++++
>  include/asm-generic/Kbuild       |  1 +
>  include/asm-generic/ima-efi.h    | 16 ++++++++++++++++
>  security/integrity/ima/ima_efi.c |  5 +----
>  5 files changed, 30 insertions(+), 7 deletions(-)
>  create mode 100644 arch/x86/include/asm/ima-efi.h
>  create mode 100644 include/asm-generic/ima-efi.h
>
> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
> index c4555b269a1b..99f31176c892 100644
> --- a/arch/x86/include/asm/efi.h
> +++ b/arch/x86/include/asm/efi.h
> @@ -418,9 +418,6 @@ extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
>  extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
>                                      void *buf, struct efi_mem_range *mem);
>
> -#define arch_ima_efi_boot_mode \
> -       ({ extern struct boot_params boot_params; boot_params.secure_boot; })
> -
>  #ifdef CONFIG_EFI_RUNTIME_MAP
>  int efi_get_runtime_map_size(void);
>  int efi_get_runtime_map_desc_size(void);
> diff --git a/arch/x86/include/asm/ima-efi.h b/arch/x86/include/asm/ima-efi.h
> new file mode 100644
> index 000000000000..3fe054937077
> --- /dev/null
> +++ b/arch/x86/include/asm/ima-efi.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_X86_IMA_EFI_H
> +#define _ASM_X86_IMA_EFI_H
> +
> +#include <asm/bootparam.h>
> +
> +#define arch_ima_efi_boot_mode \
> +       ({ extern struct boot_params boot_params; boot_params.secure_boot; })
> +

Could you please check whether this kludge is still needed now that we
no longer have conflicting declarations of boot_params? (i.e., drop
the ({ }) and the extern declaration)



> +#include <asm-generic/ima-efi.h>
> +
> +#endif /* _ASM_X86_IMA_EFI_H */
> diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
> index def242528b1d..4fd16e71e8cd 100644
> --- a/include/asm-generic/Kbuild
> +++ b/include/asm-generic/Kbuild
> @@ -26,6 +26,7 @@ mandatory-y += ftrace.h
>  mandatory-y += futex.h
>  mandatory-y += hardirq.h
>  mandatory-y += hw_irq.h
> +mandatory-y += ima-efi.h
>  mandatory-y += io.h
>  mandatory-y += irq.h
>  mandatory-y += irq_regs.h
> diff --git a/include/asm-generic/ima-efi.h b/include/asm-generic/ima-efi.h
> new file mode 100644
> index 000000000000..f87f5edef440
> --- /dev/null
> +++ b/include/asm-generic/ima-efi.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +#ifndef __ASM_GENERIC_IMA_EFI_H_
> +#define __ASM_GENERIC_IMA_EFI_H_
> +
> +#include <linux/efi.h>
> +
> +/*
> + * Only include this header file from your architecture's <asm/ima-efi.h>.
> + */
> +
> +#ifndef arch_ima_efi_boot_mode
> +#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
> +#endif
> +
> +#endif /* __ASM_GENERIC_FB_H_ */
> diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c
> index 138029bfcce1..56bbee271cec 100644
> --- a/security/integrity/ima/ima_efi.c
> +++ b/security/integrity/ima/ima_efi.c
> @@ -6,10 +6,7 @@
>  #include <linux/module.h>
>  #include <linux/ima.h>
>  #include <asm/efi.h>
> -
> -#ifndef arch_ima_efi_boot_mode
> -#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
> -#endif
> +#include <asm/ima-efi.h>
>
>  static enum efi_secureboot_mode get_sb_mode(void)
>  {
> --
> 2.43.0
>
Re: [PATCH 2/3] arch/x86: Add <asm/ima-efi.h> for arch_ima_efi_boot_mode
Posted by Thomas Zimmermann 2 years ago 
Hi

Am 07.12.23 um 16:37 schrieb Ard Biesheuvel:
> On Wed, 6 Dec 2023 at 13:54, Thomas Zimmermann <tzimmermann@suse.de> wrote:
>>
>> The header file <asm/efi.h> contains the macro arch_ima_efi_boot_mode,
>> which expands to use struct boot_params from <asm/bootparams.h>. Many
>> drivers include <linux/efi.h>, but do not use boot parameters. Changes
>> to bootparam.h or its included headers can easily trigger large,
>> unnessary rebuilds of the kernel.
>>
>> Moving x86's arch_ima_efi_boot_mode to <asm/ima-efi.h> and including
>> <asm/bootparam.h> separates that dependency from the rest of the EFI
>> interfaces. The only user is in ima_efi.c. As the file already declares
>> a default value for arch_ima_efi_boot_mode, move this define into
>> asm-generic for all other architectures.
>>
>> With arch_ima_efi_boot_mode removed from efi.h, <asm/bootparam.h> can
>> later be removed from further x86 header files.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> ---
>>   arch/x86/include/asm/efi.h       |  3 ---
>>   arch/x86/include/asm/ima-efi.h   | 12 ++++++++++++
>>   include/asm-generic/Kbuild       |  1 +
>>   include/asm-generic/ima-efi.h    | 16 ++++++++++++++++
>>   security/integrity/ima/ima_efi.c |  5 +----
>>   5 files changed, 30 insertions(+), 7 deletions(-)
>>   create mode 100644 arch/x86/include/asm/ima-efi.h
>>   create mode 100644 include/asm-generic/ima-efi.h
>>
>> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
>> index c4555b269a1b..99f31176c892 100644
>> --- a/arch/x86/include/asm/efi.h
>> +++ b/arch/x86/include/asm/efi.h
>> @@ -418,9 +418,6 @@ extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
>>   extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
>>                                       void *buf, struct efi_mem_range *mem);
>>
>> -#define arch_ima_efi_boot_mode \
>> -       ({ extern struct boot_params boot_params; boot_params.secure_boot; })
>> -
>>   #ifdef CONFIG_EFI_RUNTIME_MAP
>>   int efi_get_runtime_map_size(void);
>>   int efi_get_runtime_map_desc_size(void);
>> diff --git a/arch/x86/include/asm/ima-efi.h b/arch/x86/include/asm/ima-efi.h
>> new file mode 100644
>> index 000000000000..3fe054937077
>> --- /dev/null
>> +++ b/arch/x86/include/asm/ima-efi.h
>> @@ -0,0 +1,12 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _ASM_X86_IMA_EFI_H
>> +#define _ASM_X86_IMA_EFI_H
>> +
>> +#include <asm/bootparam.h>
>> +
>> +#define arch_ima_efi_boot_mode \
>> +       ({ extern struct boot_params boot_params; boot_params.secure_boot; })
>> +
> 
> Could you please check whether this kludge is still needed now that we
> no longer have conflicting declarations of boot_params? (i.e., drop
> the ({ }) and the extern declaration)

I dropped this and include setup.h instead. Appears to work.

Best regards
Thomas

> 
> 
> 
>> +#include <asm-generic/ima-efi.h>
>> +
>> +#endif /* _ASM_X86_IMA_EFI_H */
>> diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
>> index def242528b1d..4fd16e71e8cd 100644
>> --- a/include/asm-generic/Kbuild
>> +++ b/include/asm-generic/Kbuild
>> @@ -26,6 +26,7 @@ mandatory-y += ftrace.h
>>   mandatory-y += futex.h
>>   mandatory-y += hardirq.h
>>   mandatory-y += hw_irq.h
>> +mandatory-y += ima-efi.h
>>   mandatory-y += io.h
>>   mandatory-y += irq.h
>>   mandatory-y += irq_regs.h
>> diff --git a/include/asm-generic/ima-efi.h b/include/asm-generic/ima-efi.h
>> new file mode 100644
>> index 000000000000..f87f5edef440
>> --- /dev/null
>> +++ b/include/asm-generic/ima-efi.h
>> @@ -0,0 +1,16 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +
>> +#ifndef __ASM_GENERIC_IMA_EFI_H_
>> +#define __ASM_GENERIC_IMA_EFI_H_
>> +
>> +#include <linux/efi.h>
>> +
>> +/*
>> + * Only include this header file from your architecture's <asm/ima-efi.h>.
>> + */
>> +
>> +#ifndef arch_ima_efi_boot_mode
>> +#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
>> +#endif
>> +
>> +#endif /* __ASM_GENERIC_FB_H_ */
>> diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c
>> index 138029bfcce1..56bbee271cec 100644
>> --- a/security/integrity/ima/ima_efi.c
>> +++ b/security/integrity/ima/ima_efi.c
>> @@ -6,10 +6,7 @@
>>   #include <linux/module.h>
>>   #include <linux/ima.h>
>>   #include <asm/efi.h>
>> -
>> -#ifndef arch_ima_efi_boot_mode
>> -#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
>> -#endif
>> +#include <asm/ima-efi.h>
>>
>>   static enum efi_secureboot_mode get_sb_mode(void)
>>   {
>> --
>> 2.43.0
>>

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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