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Subjectscripts/selinux build error in 4.14 after glibc update
Hi all,

After a glibc update to 2.29, my 4.14 builds started failing like so:

$ make -j$(nproc) defconfig bzImage
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
SHIPPED scripts/kconfig/zconf.tab.c
SHIPPED scripts/kconfig/zconf.lex.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
*** Default configuration is based on 'x86_64_defconfig'
#
# configuration written to .config
#
scripts/kconfig/conf --silentoldconfig Kconfig
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
UPD include/generated/uapi/linux/version.h
DESCEND objtool
HOSTCC /home/nathan/cbl/linux-stable/tools/objtool/fixdep.o
HOSTLD /home/nathan/cbl/linux-stable/tools/objtool/fixdep-in.o
LINK /home/nathan/cbl/linux-stable/tools/objtool/fixdep
CC /home/nathan/cbl/linux-stable/tools/objtool/builtin-check.o
CC /home/nathan/cbl/linux-stable/tools/objtool/builtin-orc.o
CC /home/nathan/cbl/linux-stable/tools/objtool/check.o
CC /home/nathan/cbl/linux-stable/tools/objtool/orc_gen.o
CC /home/nathan/cbl/linux-stable/tools/objtool/orc_dump.o
CC /home/nathan/cbl/linux-stable/tools/objtool/elf.o
CC /home/nathan/cbl/linux-stable/tools/objtool/special.o
GEN /home/nathan/cbl/linux-stable/tools/objtool/arch/x86/lib/inat-tables.c
CC /home/nathan/cbl/linux-stable/tools/objtool/objtool.o
CC /home/nathan/cbl/linux-stable/tools/objtool/libstring.o
CC /home/nathan/cbl/linux-stable/tools/objtool/str_error_r.o
CC /home/nathan/cbl/linux-stable/tools/objtool/exec-cmd.o
CC /home/nathan/cbl/linux-stable/tools/objtool/pager.o
CC /home/nathan/cbl/linux-stable/tools/objtool/help.o
CC /home/nathan/cbl/linux-stable/tools/objtool/parse-options.o
CC /home/nathan/cbl/linux-stable/tools/objtool/run-command.o
CC /home/nathan/cbl/linux-stable/tools/objtool/sigchain.o
CC /home/nathan/cbl/linux-stable/tools/objtool/subcmd-config.o
CC /home/nathan/cbl/linux-stable/tools/objtool/arch/x86/decode.o
LD /home/nathan/cbl/linux-stable/tools/objtool/libsubcmd-in.o
LD /home/nathan/cbl/linux-stable/tools/objtool/arch/x86/objtool-in.o
LD /home/nathan/cbl/linux-stable/tools/objtool/objtool-in.o
AR /home/nathan/cbl/linux-stable/tools/objtool/libsubcmd.a
LINK /home/nathan/cbl/linux-stable/tools/objtool/objtool
UPD include/config/kernel.release
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_common.o
HOSTCC arch/x86/tools/relocs_64.o
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/clkdev.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
CHK include/generated/utsrelease.h
UPD include/generated/utsrelease.h
HOSTCC scripts/kallsyms
HOSTCC scripts/pnmtologo
HOSTCC scripts/conmakehash
HOSTCC scripts/sortextable
CC scripts/mod/empty.o
CC scripts/mod/devicetable-offsets.s
HOSTCC scripts/mod/mk_elfconfig
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/selinux/genheaders/genheaders
In file included from scripts/selinux/genheaders/genheaders.c:19:
./security/selinux/include/classmap.h:245:2: error: #error New address family defined, please update secclass_map.
#error New address family defined, please update secclass_map.
^~~~~
make[4]: *** [scripts/Makefile.host:102: scripts/selinux/genheaders/genheaders] Error 1
make[3]: *** [scripts/Makefile.build:585: scripts/selinux/genheaders] Error 2
make[3]: *** Waiting for unfinished jobs....
In file included from scripts/selinux/mdp/mdp.c:49:
./security/selinux/include/classmap.h:245:2: error: #error New address family defined, please update secclass_map.
#error New address family defined, please update secclass_map.
^~~~~
make[4]: *** [scripts/Makefile.host:102: scripts/selinux/mdp/mdp] Error 1
make[3]: *** [scripts/Makefile.build:585: scripts/selinux/mdp] Error 2
make[2]: *** [scripts/Makefile.build:585: scripts/selinux] Error 2
make[2]: *** Waiting for unfinished jobs....
HOSTLD arch/x86/tools/relocs
CHK scripts/mod/devicetable-offsets.h
UPD scripts/mod/devicetable-offsets.h
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/mod/sumversion.o
CHK include/generated/timeconst.h
CC kernel/bounds.s
UPD include/generated/timeconst.h
CHK include/generated/bounds.h
UPD include/generated/bounds.h
CC arch/x86/kernel/asm-offsets.s
HOSTLD scripts/mod/modpost
make[1]: *** [Makefile:572: scripts] Error 2
make[1]: *** Waiting for unfinished jobs....
CHK include/generated/asm-offsets.h
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
make: *** [Makefile:264: __build_one_by_one] Error 2

This is due to commit c017c71ce09f ("selinux: include sys/socket.h in
host programs to have PF_MAX") [1] in the kernel interacting poorly
with glibc's commit 38b0593e9a ("Add PF_XDP, AF_XDP and SOL_XDP from
Linux 4.18 to bits/socket.h.") [2]

I am not really sure how this should be fixed or who is at fault but I
didn't see it reported anywhere yet (I assume the kernel) and I feel
more comfortable on the kernel mailing list than other bug trackers so
here we are.

[1]: https://git.kernel.org/linus/c017c71ce09f4c7a5378fccbec6a3d7e96b0c5c2
[2]: https://sourceware.org/git/?p=glibc.git;a=commit;h=38b0593e9a862c3b35392a0f5b202696b8116aa3

Thanks,
Nathan

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