| Message ID | 20231206125433.18420-3-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | arch/x86: Remove unnecessary dependencies on bootparam.h | expand |
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 >
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 >>
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) {
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