ima: add a new CONFIG for loading arch-specific policies

Every time a new architecture defines the IMA architecture specific
functions - arch_ima_get_secureboot() and arch_ima_get_policy(), the IMA
include file needs to be updated. To avoid this "noise", this patch
defines a new IMA Kconfig IMA_SECURE_AND_OR_TRUSTED_BOOT option, allowing
the different architectures to select it.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Philipp Rudo <prudo@linux.ibm.com> (s390)
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 497b7d0..5b9f1cb 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -979,6 +979,7 @@ config PPC_SECURE_BOOT
        bool
        depends on PPC_POWERNV
        depends on IMA_ARCH_POLICY
+       imply IMA_SECURE_AND_OR_TRUSTED_BOOT
        help
          Systems with firmware secure boot enabled need to define security
          policies to extend secure boot to the OS. This config allows a user

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8abe775..59c216a 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -195,6 +195,7 @@ config S390
        select ARCH_HAS_FORCE_DMA_UNENCRYPTED
        select SWIOTLB
        select GENERIC_ALLOCATOR
+       imply IMA_SECURE_AND_OR_TRUSTED_BOOT
 
 
 config SCHED_OMIT_FRAME_POINTER

diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 2b1203c..578a6fa 100644 (file)
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -70,7 +70,7 @@ obj-$(CONFIG_JUMP_LABEL)      += jump_label.o
 obj-$(CONFIG_KEXEC_FILE)       += machine_kexec_file.o kexec_image.o
 obj-$(CONFIG_KEXEC_FILE)       += kexec_elf.o
 
-obj-$(CONFIG_IMA)              += ima_arch.o
+obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT)   += ima_arch.o
 
 obj-$(CONFIG_PERF_EVENTS)      += perf_event.o perf_cpum_cf_common.o
 obj-$(CONFIG_PERF_EVENTS)      += perf_cpum_cf.o perf_cpum_sf.o

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index beea770..dcf5b17 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -230,6 +230,7 @@ config X86
        select VIRT_TO_BUS
        select X86_FEATURE_NAMES                if PROC_FS
        select PROC_PID_ARCH_STATUS             if PROC_FS
+       imply IMA_SECURE_AND_OR_TRUSTED_BOOT    if EFI
 
 config INSTRUCTION_DECODER
        def_bool y

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9b294c1..cfef37a 100644 (file)
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -154,6 +154,4 @@ ifeq ($(CONFIG_X86_64),y)
        obj-y                           += vsmp_64.o
 endif
 
-ifdef CONFIG_EFI
-obj-$(CONFIG_IMA)                      += ima_arch.o
-endif
+obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT)   += ima_arch.o

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 1659217..aefe758 100644 (file)
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -30,8 +30,7 @@ extern void ima_kexec_cmdline(const void *buf, int size);
 extern void ima_add_kexec_buffer(struct kimage *image);
 #endif
 
-#if (defined(CONFIG_X86) && defined(CONFIG_EFI)) || defined(CONFIG_S390) \
-       || defined(CONFIG_PPC_SECURE_BOOT)
+#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
 extern bool arch_ima_get_secureboot(void);
 extern const char * const *arch_get_ima_policy(void);
 #else

diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index 3f3ee4e..edde88d 100644 (file)
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -327,3 +327,10 @@ config IMA_QUEUE_EARLY_BOOT_KEYS
        depends on IMA_MEASURE_ASYMMETRIC_KEYS
        depends on SYSTEM_TRUSTED_KEYRING
        default y
+
+config IMA_SECURE_AND_OR_TRUSTED_BOOT
+       bool
+       depends on IMA_ARCH_POLICY
+       help
+          This option is selected by architectures to enable secure and/or
+          trusted boot based on IMA runtime policies.