kernel/Makefile

   1 #
   2 # Makefile for the linux kernel.
   3 #
   4
   5 obj-y     = fork.o exec_domain.o panic.o \
   6             cpu.o exit.o softirq.o resource.o \
   7             sysctl.o sysctl_binary.o capability.o ptrace.o user.o \
   8             signal.o sys.o kmod.o workqueue.o pid.o task_work.o \
   9             extable.o params.o \
  10             kthread.o sys_ni.o nsproxy.o \
  11             notifier.o ksysfs.o cred.o reboot.o \
  12             async.o range.o smpboot.o
  13
  14 obj-$(CONFIG_MULTIUSER) += groups.o
  15
  16 ifdef CONFIG_FUNCTION_TRACER
  17 # Do not trace debug files and internal ftrace files
  18 CFLAGS_REMOVE_cgroup-debug.o = $(CC_FLAGS_FTRACE)
  19 CFLAGS_REMOVE_irq_work.o = $(CC_FLAGS_FTRACE)
  20 endif
  21
  22 # cond_syscall is currently not LTO compatible
  23 CFLAGS_sys_ni.o = $(DISABLE_LTO)
  24
  25 obj-y += sched/
  26 obj-y += locking/
  27 obj-y += power/
  28 obj-y += printk/
  29 obj-y += irq/
  30 obj-y += rcu/
  31 obj-y += livepatch/
  32
  33 obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
  34 obj-$(CONFIG_FREEZER) += freezer.o
  35 obj-$(CONFIG_PROFILING) += profile.o
  36 obj-$(CONFIG_STACKTRACE) += stacktrace.o
  37 obj-y += time/
  38 obj-$(CONFIG_FUTEX) += futex.o
  39 ifeq ($(CONFIG_COMPAT),y)
  40 obj-$(CONFIG_FUTEX) += futex_compat.o
  41 endif
  42 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
  43 obj-$(CONFIG_SMP) += smp.o
  44 ifneq ($(CONFIG_SMP),y)
  45 obj-y += up.o
  46 endif
  47 obj-$(CONFIG_UID16) += uid16.o
  48 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
  49 obj-$(CONFIG_MODULES) += module.o
  50 obj-$(CONFIG_MODULE_SIG) += module_signing.o
  51 obj-$(CONFIG_KALLSYMS) += kallsyms.o
  52 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
  53 obj-$(CONFIG_KEXEC) += kexec.o
  54 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
  55 obj-$(CONFIG_COMPAT) += compat.o
  56 obj-$(CONFIG_CGROUPS) += cgroup.o
  57 obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
  58 obj-$(CONFIG_CPUSETS) += cpuset.o
  59 obj-$(CONFIG_UTS_NS) += utsname.o
  60 obj-$(CONFIG_USER_NS) += user_namespace.o
  61 obj-$(CONFIG_PID_NS) += pid_namespace.o
  62 obj-$(CONFIG_IKCONFIG) += configs.o
  63 obj-$(CONFIG_SMP) += stop_machine.o
  64 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
  65 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
  66 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
  67 obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
  68 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
  69 obj-$(CONFIG_GCOV_KERNEL) += gcov/
  70 obj-$(CONFIG_KPROBES) += kprobes.o
  71 obj-$(CONFIG_KGDB) += debug/
  72 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
  73 obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
  74 obj-$(CONFIG_SECCOMP) += seccomp.o
  75 obj-$(CONFIG_RELAY) += relay.o
  76 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
  77 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
  78 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
  79 obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
  80 obj-$(CONFIG_LATENCYTOP) += latencytop.o
  81 obj-$(CONFIG_BINFMT_ELF) += elfcore.o
  82 obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
  83 obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
  84 obj-$(CONFIG_FUNCTION_TRACER) += trace/
  85 obj-$(CONFIG_TRACING) += trace/
  86 obj-$(CONFIG_TRACE_CLOCK) += trace/
  87 obj-$(CONFIG_RING_BUFFER) += trace/
  88 obj-$(CONFIG_TRACEPOINTS) += trace/
  89 obj-$(CONFIG_IRQ_WORK) += irq_work.o
  90 obj-$(CONFIG_CPU_PM) += cpu_pm.o
  91 obj-$(CONFIG_BPF) += bpf/
  92
  93 obj-$(CONFIG_PERF_EVENTS) += events/
  94
  95 obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
  96 obj-$(CONFIG_PADATA) += padata.o
  97 obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
  98 obj-$(CONFIG_JUMP_LABEL) += jump_label.o
  99 obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
 100 obj-$(CONFIG_TORTURE_TEST) += torture.o
 101
 102 $(obj)/configs.o: $(obj)/config_data.h
 103
 104 # config_data.h contains the same information as ikconfig.h but gzipped.
 105 # Info from config_data can be extracted from /proc/config*
 106 targets += config_data.gz
 107 $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 108         $(call if_changed,gzip)
 109
 110       filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/basic/bin2c; echo "MAGIC_END;")
 111 targets += config_data.h
 112 $(obj)/config_data.h: $(obj)/config_data.gz FORCE
 113         $(call filechk,ikconfiggz)
 114
 115 ###############################################################################
 116 #
 117 # Roll all the X.509 certificates that we can find together and pull them into
 118 # the kernel so that they get loaded into the system trusted keyring during
 119 # boot.
 120 #
 121 # We look in the source root and the build root for all files whose name ends
 122 # in ".x509".  Unfortunately, this will generate duplicate filenames, so we
 123 # have make canonicalise the pathnames and then sort them to discard the
 124 # duplicates.
 125 #
 126 ###############################################################################
 127 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
 128 X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
 129 X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
 130 X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
 131                                 $(or $(realpath $(CERT)),$(CERT))))
 132 X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
 133
 134 ifeq ($(X509_CERTIFICATES),)
 135 $(warning *** No X.509 certificates found ***)
 136 endif
 137
 138 ifneq ($(wildcard $(obj)/.x509.list),)
 139 ifneq ($(shell cat $(obj)/.x509.list),$(X509_CERTIFICATES))
 140 $(info X.509 certificate list changed)
 141 $(shell rm $(obj)/.x509.list)
 142 endif
 143 endif
 144
 145 kernel/system_certificates.o: $(obj)/x509_certificate_list
 146
 147 quiet_cmd_x509certs  = CERTS   $@
 148       cmd_x509certs  = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; $(kecho) "  - Including cert $(X509)")
 149
 150 targets += $(obj)/x509_certificate_list
 151 $(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
 152         $(call if_changed,x509certs)
 153
 154 targets += $(obj)/.x509.list
 155 $(obj)/.x509.list:
 156         @echo $(X509_CERTIFICATES) >$@
 157 endif
 158
 159 clean-files := x509_certificate_list .x509.list
 160
 161 ifeq ($(CONFIG_MODULE_SIG),y)
 162 ###############################################################################
 163 #
 164 # If module signing is requested, say by allyesconfig, but a key has not been
 165 # supplied, then one will need to be generated to make sure the build does not
 166 # fail and that the kernel may be used afterwards.
 167 #
 168 ###############################################################################
 169 ifndef CONFIG_MODULE_SIG_HASH
 170 $(error Could not determine digest type to use from kernel config)
 171 endif
 172
 173 signing_key.priv signing_key.x509: x509.genkey
 174         @echo "###"
 175         @echo "### Now generating an X.509 key pair to be used for signing modules."
 176         @echo "###"
 177         @echo "### If this takes a long time, you might wish to run rngd in the"
 178         @echo "### background to keep the supply of entropy topped up.  It"
 179         @echo "### needs to be run as root, and uses a hardware random"
 180         @echo "### number generator if one is available."
 181         @echo "###"
 182         openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
 183                 -batch -x509 -config x509.genkey \
 184                 -outform DER -out signing_key.x509 \
 185                 -keyout signing_key.priv 2>&1
 186         @echo "###"
 187         @echo "### Key pair generated."
 188         @echo "###"
 189
 190 x509.genkey:
 191         @echo Generating X.509 key generation config
 192         @echo  >x509.genkey "[ req ]"
 193         @echo >>x509.genkey "default_bits = 4096"
 194         @echo >>x509.genkey "distinguished_name = req_distinguished_name"
 195         @echo >>x509.genkey "prompt = no"
 196         @echo >>x509.genkey "string_mask = utf8only"
 197         @echo >>x509.genkey "x509_extensions = myexts"
 198         @echo >>x509.genkey
 199         @echo >>x509.genkey "[ req_distinguished_name ]"
 200         @echo >>x509.genkey "#O = Unspecified company"
 201         @echo >>x509.genkey "CN = Build time autogenerated kernel key"
 202         @echo >>x509.genkey "#emailAddress = unspecified.user@unspecified.company"
 203         @echo >>x509.genkey
 204         @echo >>x509.genkey "[ myexts ]"
 205         @echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
 206         @echo >>x509.genkey "keyUsage=digitalSignature"
 207         @echo >>x509.genkey "subjectKeyIdentifier=hash"
 208         @echo >>x509.genkey "authorityKeyIdentifier=keyid"
 209 endif