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Building binaries as PIE allows the executable itself to be loaded at a random address when ASLR is enabled (not just its shared libraries). With this change PIE objects have a .pieo extension and INTERNALLIB libraries libXXX_pie.a. MK_PIE is disabled for some kerberos5 tools, Clang, and Subversion, as they explicitly reference .a libraries in their Makefiles. These can be addressed on an individual basis later. MK_PIE is also disabled for rtld-elf because it is already position-independent using bespoke Makefile rules. Currently only dynamically linked binaries will be built as PIE. Discussed with: dim Reviewed by: kib MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18423
43 lines
1016 B
Makefile
43 lines
1016 B
Makefile
# Common defines for all of stand/i386/
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#
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# $FreeBSD$
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.include "bsd.linker.mk"
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LOADER_ADDRESS?=0x200000
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LDFLAGS+= -nostdlib
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LDFLAGS.lld+= -Wl,--no-rosegment
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MK_PIE:= no
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# BTX components
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BTXDIR= ${BOOTOBJ}/i386/btx
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BTXLDR= ${BTXDIR}/btxldr/btxldr
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BTXKERN= ${BTXDIR}/btx/btx
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BTXCRT= ${BTXDIR}/lib/crt0.o
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BTXSRC= ${BOOTSRC}/i386/btx
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BTXLIB= ${BTXSRC}/lib
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CFLAGS+= -I${BTXLIB}
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# compact binary with no padding between text, data, bss
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LDSCRIPT= ${BOOTSRC}/i386/boot.ldscript
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# LDFLAGS_BIN=-e start -Ttext ${ORG} -Wl,-T,${LDSCRIPT},-S,--oformat,binary
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# LD_FLAGS_BIN=-static -T ${LDSCRIPT} --gc-sections
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LDFLAGS_BIN=-e start -Ttext ${ORG} -Wl,-N,-S,--oformat,binary
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.if ${LINKER_FEATURES:Mbuild-id} != ""
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LDFLAGS_BIN+=-Wl,--build-id=none
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.endif
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LD_FLAGS_BIN=-static -N --gc-sections
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.if ${MACHINE_CPUARCH} == "amd64"
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DO32=1
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.endif
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.if defined(LOADER_FIREWIRE_SUPPORT)
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MK_LOADER_FIREWIRE=yes
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.warning "LOADER_FIREWIRE_SUPPORT deprecated, please move to WITH_LOADER_FIREWIRE"
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.endif
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.include "../Makefile.inc"
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