[build] Exclude selected directories from Secure Boot builds
When submitting binaries for UEFI Secure Boot signing, certain known-dubious subsystems (such as 802.11 and NFS) must be excluded from the build. Mark the directories containing these subsystems as insecure, and allow the build target to include an explicit "security flag" (a literal "-sb" appended to the build platform) to exclude these source directories from the build process. For example: make bin-x86_64-efi-sb/ipxe.efi will build iPXE with all code from the 802.11 and NFS subsystems excluded from the build. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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16
src/Makefile
16
src/Makefile
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@ -62,7 +62,7 @@ QEMUIMG := qemu-img
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SRCDIRS :=
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SRCDIRS += libgcc
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SRCDIRS += core
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SRCDIRS += net net/oncrpc net/tcp net/udp net/infiniband net/80211
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SRCDIRS += net net/tcp net/udp net/infiniband
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SRCDIRS += image
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SRCDIRS += drivers/bus
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SRCDIRS += drivers/net
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@ -71,10 +71,6 @@ SRCDIRS += drivers/net/e1000e
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SRCDIRS += drivers/net/igb
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SRCDIRS += drivers/net/igbvf
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SRCDIRS += drivers/net/phantom
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SRCDIRS += drivers/net/rtl818x
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SRCDIRS += drivers/net/ath
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SRCDIRS += drivers/net/ath/ath5k
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SRCDIRS += drivers/net/ath/ath9k
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SRCDIRS += drivers/net/vxge
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SRCDIRS += drivers/net/efi
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SRCDIRS += drivers/net/tg3
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@ -105,6 +101,16 @@ SRCDIRS += hci/keymap
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SRCDIRS += usr
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SRCDIRS += config
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# These directories contain code that is not eligible for UEFI Secure
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# Boot signing.
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#
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SRCDIRS_INSEC += net/oncrpc
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SRCDIRS_INSEC += net/80211
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SRCDIRS_INSEC += drivers/net/rtl818x
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SRCDIRS_INSEC += drivers/net/ath
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SRCDIRS_INSEC += drivers/net/ath/ath5k
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SRCDIRS_INSEC += drivers/net/ath/ath9k
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# NON_AUTO_SRCS lists files that are excluded from the normal
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# automatic build system.
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#
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@ -299,7 +299,7 @@ endif
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#
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# Select build architecture and platform based on $(BIN)
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#
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# BIN has the form bin[-[arch-]platform]
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# BIN has the form bin[-[<arch>-]<platform>[-sb]]
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ARCHS := $(patsubst arch/%,%,$(wildcard arch/*))
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PLATFORMS := $(patsubst config/defaults/%.h,%,\
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@ -312,17 +312,18 @@ platforms :
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ifdef BIN
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# Determine architecture portion of $(BIN), if present
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BIN_ARCH := $(strip $(foreach A,$(ARCHS),\
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$(patsubst bin-$(A)-%,$(A),\
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$(filter bin-$(A)-%,$(BIN)))))
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# Determine platform portion of $(BIN), if present
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ifeq ($(BIN_ARCH),)
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BIN_PLATFORM := $(patsubst bin-%,%,$(filter bin-%,$(BIN)))
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# Split $(BIN) into architecture, platform, and security flag (where present)
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BIN_ELEMENTS := $(subst -,$(SPACE),$(BIN))
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BIN_APS := $(wordlist 2,4,$(BIN_ELEMENTS))
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ifeq ($(lastword $(BIN_APS)),sb)
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BIN_AP := $(wordlist 2,$(words $(BIN_APS)),discard $(BIN_APS))
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BIN_SECUREBOOT := 1
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else
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BIN_PLATFORM := $(patsubst bin-$(BIN_ARCH)-%,%,$(BIN))
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BIN_AP := $(BIN_APS)
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BIN_SECUREBOOT := 0
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endif
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BIN_PLATFORM := $(lastword $(BIN_AP))
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BIN_ARCH := $(wordlist 2,$(words $(BIN_AP)),discard $(BIN_AP))
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# Determine build architecture
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DEFAULT_ARCH := i386
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@ -339,6 +340,13 @@ CFLAGS += -DPLATFORM=$(PLATFORM)
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platform :
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@$(ECHO) $(PLATFORM)
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# Determine security flag
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DEFAULT_SECUREBOOT := 0
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SECUREBOOT := $(firstword $(BIN_SECUREBOOT) $(DEFAULT_SECUREBOOT))
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CFLAGS += -DSECUREBOOT=$(SECUREBOOT)
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secureboot :
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@$(ECHO) $(SECUREBOOT)
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endif # defined(BIN)
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# Include architecture-specific Makefile
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@ -357,6 +365,11 @@ endif
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#
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# Source file handling
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# Exclude known-insecure files from Secure Boot builds
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ifeq ($(SECUREBOOT),0)
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SRCDIRS += $(SRCDIRS_INSEC)
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endif
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# SRCDIRS lists all directories containing source files.
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srcdirs :
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@$(ECHO) $(SRCDIRS)
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