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ima: generalize x86/EFI arch glue for other EFI architectures

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Move the x86 IMA arch code into security/integrity/ima/ima_efi.c,
so that we will be able to wire it up for arm64 in a future patch.

Co-developed-by: Chester Lin <clin@suse.com>
Signed-off-by: Chester Lin <clin@suse.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Chester Lin 2020-10-30 14:08:39 +08:00 • committed by Ard Biesheuvel
parent e1ac4b2406
commit 25519d6834
4 changed files with 19 additions and 35 deletions
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3
arch/x86/include/asm/efi.h
View file

@ -380,4 +380,7 @@ static inline void efi_fake_memmap_early(void)
} }
#endif #endif
#define arch_ima_efi_boot_mode \
({ extern struct boot_params boot_params; boot_params.secure_boot; })
#endif /* _ASM_X86_EFI_H */ #endif /* _ASM_X86_EFI_H */

2
arch/x86/kernel/Makefile
View file

@ -161,5 +161,3 @@ ifeq ($(CONFIG_X86_64),y)
obj-$(CONFIG_MMCONF_FAM10H) += mmconf-fam10h_64.o obj-$(CONFIG_MMCONF_FAM10H) += mmconf-fam10h_64.o
obj-y += vsmp_64.o obj-y += vsmp_64.o
endif endif
obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o

4
security/integrity/ima/Makefile
View file

@ -14,3 +14,7 @@ ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
ima-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o ima-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
ima-$(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) += ima_asymmetric_keys.o ima-$(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) += ima_asymmetric_keys.o
ima-$(CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS) += ima_queue_keys.o ima-$(CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS) += ima_queue_keys.o
ifeq ($(CONFIG_EFI),y)
ima-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_efi.o
endif

45
arch/x86/kernel/ima_arch.c → security/integrity/ima/ima_efi.c
View file

@ -5,50 +5,29 @@
#include <linux/efi.h> #include <linux/efi.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/ima.h> #include <linux/ima.h>
#include <asm/efi.h>
extern struct boot_params boot_params; #ifndef arch_ima_efi_boot_mode
#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
#endif
static enum efi_secureboot_mode get_sb_mode(void) static enum efi_secureboot_mode get_sb_mode(void)
{ {
efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID; enum efi_secureboot_mode mode;
efi_status_t status;
unsigned long size;
u8 secboot, setupmode;
size = sizeof(secboot);
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) { if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
pr_info("ima: secureboot mode unknown, no efi\n"); pr_info("ima: secureboot mode unknown, no efi\n");
return efi_secureboot_mode_unknown; return efi_secureboot_mode_unknown;
} }
/* Get variable contents into buffer */ mode = efi_get_secureboot_mode(efi.get_variable);
status = efi.get_variable(L"SecureBoot", &efi_variable_guid, if (mode == efi_secureboot_mode_disabled)
NULL, &size, &secboot);
if (status == EFI_NOT_FOUND) {
pr_info("ima: secureboot mode disabled\n"); pr_info("ima: secureboot mode disabled\n");
return efi_secureboot_mode_disabled; else if (mode == efi_secureboot_mode_unknown)
}
if (status != EFI_SUCCESS) {
pr_info("ima: secureboot mode unknown\n"); pr_info("ima: secureboot mode unknown\n");
return efi_secureboot_mode_unknown; else
} pr_info("ima: secureboot mode enabled\n");
return mode;
size = sizeof(setupmode);
status = efi.get_variable(L"SetupMode", &efi_variable_guid,
NULL, &size, &setupmode);
if (status != EFI_SUCCESS) /* ignore unknown SetupMode */
setupmode = 0;
if (secboot == 0 || setupmode == 1) {
pr_info("ima: secureboot mode disabled\n");
return efi_secureboot_mode_disabled;
}
pr_info("ima: secureboot mode enabled\n");
return efi_secureboot_mode_enabled;
} }
bool arch_ima_get_secureboot(void) bool arch_ima_get_secureboot(void)
@ -57,7 +36,7 @@ bool arch_ima_get_secureboot(void)
static bool initialized; static bool initialized;
if (!initialized && efi_enabled(EFI_BOOT)) { if (!initialized && efi_enabled(EFI_BOOT)) {
sb_mode = boot_params.secure_boot; sb_mode = arch_ima_efi_boot_mode;
if (sb_mode == efi_secureboot_mode_unset) if (sb_mode == efi_secureboot_mode_unset)
sb_mode = get_sb_mode(); sb_mode = get_sb_mode();