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8370edea81
This patch series does not do kernel signature verification yet. I plan to post another patch series for that. Now distributions are already signing PE/COFF bzImage with PKCS7 signature I plan to parse and verify those signatures. Primary goal of this patchset is to prepare groundwork so that kernel image can be signed and signatures be verified during kexec load. This should help with two things. - It should allow kexec/kdump on secureboot enabled machines. - In general it can help even without secureboot. By being able to verify kernel image signature in kexec, it should help with avoiding module signing restrictions. Matthew Garret showed how to boot into a custom kernel, modify first kernel's memory and then jump back to old kernel and bypass any policy one wants to. This patch (of 15): Kexec wants to use bin2c and it wants to use it really early in the build process. See arch/x86/purgatory/ code in later patches. So move bin2c in scripts/basic so that it can be built very early and be usable by arch/x86/purgatory/ Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
208 lines
7.3 KiB
Makefile
208 lines
7.3 KiB
Makefile
#
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# Makefile for the linux kernel.
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#
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obj-y = fork.o exec_domain.o panic.o \
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cpu.o exit.o softirq.o resource.o \
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sysctl.o sysctl_binary.o capability.o ptrace.o user.o \
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signal.o sys.o kmod.o workqueue.o pid.o task_work.o \
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extable.o params.o \
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kthread.o sys_ni.o nsproxy.o \
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notifier.o ksysfs.o cred.o reboot.o \
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async.o range.o groups.o smpboot.o
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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace debug files and internal ftrace files
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CFLAGS_REMOVE_cgroup-debug.o = -pg
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CFLAGS_REMOVE_irq_work.o = -pg
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endif
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# cond_syscall is currently not LTO compatible
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CFLAGS_sys_ni.o = $(DISABLE_LTO)
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obj-y += sched/
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obj-y += locking/
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obj-y += power/
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obj-y += printk/
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obj-y += irq/
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obj-y += rcu/
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obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
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obj-$(CONFIG_FREEZER) += freezer.o
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obj-$(CONFIG_PROFILING) += profile.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-y += time/
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obj-$(CONFIG_FUTEX) += futex.o
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ifeq ($(CONFIG_COMPAT),y)
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obj-$(CONFIG_FUTEX) += futex_compat.o
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endif
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obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
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obj-$(CONFIG_SMP) += smp.o
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ifneq ($(CONFIG_SMP),y)
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obj-y += up.o
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endif
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obj-$(CONFIG_UID16) += uid16.o
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obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULE_SIG) += module_signing.o
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obj-$(CONFIG_KALLSYMS) += kallsyms.o
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obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
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obj-$(CONFIG_KEXEC) += kexec.o
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obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
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obj-$(CONFIG_COMPAT) += compat.o
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obj-$(CONFIG_CGROUPS) += cgroup.o
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obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
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obj-$(CONFIG_CPUSETS) += cpuset.o
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obj-$(CONFIG_UTS_NS) += utsname.o
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obj-$(CONFIG_USER_NS) += user_namespace.o
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obj-$(CONFIG_PID_NS) += pid_namespace.o
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obj-$(CONFIG_IKCONFIG) += configs.o
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obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
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obj-$(CONFIG_SMP) += stop_machine.o
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obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
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obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
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obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
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obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
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obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
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obj-$(CONFIG_GCOV_KERNEL) += gcov/
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KGDB) += debug/
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obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
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obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
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obj-$(CONFIG_SECCOMP) += seccomp.o
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obj-$(CONFIG_RELAY) += relay.o
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obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
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obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
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obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
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obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
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obj-$(CONFIG_LATENCYTOP) += latencytop.o
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obj-$(CONFIG_BINFMT_ELF) += elfcore.o
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obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
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obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
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obj-$(CONFIG_FUNCTION_TRACER) += trace/
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obj-$(CONFIG_TRACING) += trace/
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obj-$(CONFIG_TRACE_CLOCK) += trace/
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obj-$(CONFIG_RING_BUFFER) += trace/
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obj-$(CONFIG_TRACEPOINTS) += trace/
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obj-$(CONFIG_IRQ_WORK) += irq_work.o
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obj-$(CONFIG_CPU_PM) += cpu_pm.o
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obj-$(CONFIG_NET) += bpf/
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obj-$(CONFIG_PERF_EVENTS) += events/
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obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
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obj-$(CONFIG_PADATA) += padata.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
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obj-$(CONFIG_TORTURE_TEST) += torture.o
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$(obj)/configs.o: $(obj)/config_data.h
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# config_data.h contains the same information as ikconfig.h but gzipped.
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# Info from config_data can be extracted from /proc/config*
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targets += config_data.gz
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$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
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$(call if_changed,gzip)
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filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/basic/bin2c; echo "MAGIC_END;")
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targets += config_data.h
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$(obj)/config_data.h: $(obj)/config_data.gz FORCE
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$(call filechk,ikconfiggz)
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###############################################################################
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#
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# Roll all the X.509 certificates that we can find together and pull them into
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# the kernel so that they get loaded into the system trusted keyring during
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# boot.
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#
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# We look in the source root and the build root for all files whose name ends
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# in ".x509". Unfortunately, this will generate duplicate filenames, so we
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# have make canonicalise the pathnames and then sort them to discard the
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# duplicates.
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#
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###############################################################################
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ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
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X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
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X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
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X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
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$(or $(realpath $(CERT)),$(CERT))))
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X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
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ifeq ($(X509_CERTIFICATES),)
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$(warning *** No X.509 certificates found ***)
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endif
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ifneq ($(wildcard $(obj)/.x509.list),)
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ifneq ($(shell cat $(obj)/.x509.list),$(X509_CERTIFICATES))
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$(info X.509 certificate list changed)
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$(shell rm $(obj)/.x509.list)
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endif
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endif
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kernel/system_certificates.o: $(obj)/x509_certificate_list
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quiet_cmd_x509certs = CERTS $@
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cmd_x509certs = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; echo " - Including cert $(X509)")
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targets += $(obj)/x509_certificate_list
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$(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
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$(call if_changed,x509certs)
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targets += $(obj)/.x509.list
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$(obj)/.x509.list:
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@echo $(X509_CERTIFICATES) >$@
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endif
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clean-files := x509_certificate_list .x509.list
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ifeq ($(CONFIG_MODULE_SIG),y)
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###############################################################################
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#
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# If module signing is requested, say by allyesconfig, but a key has not been
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# supplied, then one will need to be generated to make sure the build does not
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# fail and that the kernel may be used afterwards.
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#
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###############################################################################
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ifndef CONFIG_MODULE_SIG_HASH
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$(error Could not determine digest type to use from kernel config)
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endif
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signing_key.priv signing_key.x509: x509.genkey
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@echo "###"
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@echo "### Now generating an X.509 key pair to be used for signing modules."
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@echo "###"
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@echo "### If this takes a long time, you might wish to run rngd in the"
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@echo "### background to keep the supply of entropy topped up. It"
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@echo "### needs to be run as root, and uses a hardware random"
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@echo "### number generator if one is available."
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@echo "###"
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openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
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-batch -x509 -config x509.genkey \
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-outform DER -out signing_key.x509 \
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-keyout signing_key.priv 2>&1
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@echo "###"
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@echo "### Key pair generated."
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@echo "###"
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x509.genkey:
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@echo Generating X.509 key generation config
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@echo >x509.genkey "[ req ]"
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@echo >>x509.genkey "default_bits = 4096"
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@echo >>x509.genkey "distinguished_name = req_distinguished_name"
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@echo >>x509.genkey "prompt = no"
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@echo >>x509.genkey "string_mask = utf8only"
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@echo >>x509.genkey "x509_extensions = myexts"
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@echo >>x509.genkey
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@echo >>x509.genkey "[ req_distinguished_name ]"
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@echo >>x509.genkey "O = Magrathea"
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@echo >>x509.genkey "CN = Glacier signing key"
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@echo >>x509.genkey "emailAddress = slartibartfast@magrathea.h2g2"
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@echo >>x509.genkey
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@echo >>x509.genkey "[ myexts ]"
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@echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
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@echo >>x509.genkey "keyUsage=digitalSignature"
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@echo >>x509.genkey "subjectKeyIdentifier=hash"
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@echo >>x509.genkey "authorityKeyIdentifier=keyid"
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endif
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