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31cb50b559
linux/scripts
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Masahiro Yamada 31cb50b559 kbuild: check static EXPORT_SYMBOL* by script instead of modpost 
The 'static' specifier and EXPORT_SYMBOL() are an odd combination.

Commit 15bfc2348d ("modpost: check for static EXPORT_SYMBOL*
functions") tried to detect it, but this check has false negatives.

Here is the sample code.

  Makefile:

    obj-y += foo1.o foo2.o

  foo1.c:

    #include <linux/export.h>
    static void foo(void) {}
    EXPORT_SYMBOL(foo);

  foo2.c:

    void foo(void) {}

foo1.c exports the static symbol 'foo', but modpost cannot catch it
because it is fooled by foo2.c, which has a global symbol with the
same name.

s->is_static is cleared if a global symbol with the same name is found
somewhere, but EXPORT_SYMBOL() and the global symbol do not necessarily
belong to the same compilation unit.

This check should be done per compilation unit, but I do not know how
to do it in modpost. modpost runs against vmlinux.o or modules, which
merges multiple objects, then forgets their origin.

modpost cannot parse individual objects because they may not be ELF but
LLVM IR when CONFIG_LTO_CLANG=y.

Add a simple bash script to parse the output from ${NM}. This works for
CONFIG_LTO_CLANG=y because llvm-nm can dump symbols of LLVM IR files.

Revert 15bfc2348d.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
2022-06-01 23:07:02 +09:00
..
atomic locking/atomic: Add generic try_cmpxchg64 support 2022-05-18 00:08:27 +02:00
basic randstruct: Move seed generation into scripts/basic/ 2022-05-08 01:33:07 -07:00
clang-tools gen_compile_commands: fix missing 'sys' package 2021-09-19 10:13:03 +09:00
coccinelle drop fen.cocci 2022-01-15 12:15:35 +01:00
dtc h8300: remove stale bindings and symlink 2022-05-20 22:40:56 +02:00
dummy-tools scripts: dummy-tools, add pahole 2022-05-08 03:16:59 +09:00
gcc-plugins gcc-plugins: use KERNELVERSION for plugin version 2022-05-24 08:25:16 -07:00
gdb scripts/gdb: lx-dmesg: read records individually 2021-12-16 15:52:38 +01:00
genksyms genksyms: adjust the output format to modpost 2022-05-24 16:33:20 +09:00
kconfig kbuild: Allow kernel installation packaging to override pkg-config 2022-04-05 17:03:31 +09:00
ksymoops
mod kbuild: check static EXPORT_SYMBOL* by script instead of modpost 2022-06-01 23:07:02 +09:00
package objtool: Add CONFIG_OBJTOOL 2022-04-22 12:32:03 +02:00
selinux selinux: declare data arrays const 2022-05-03 15:53:49 -04:00
tracing scripts/tracing: fix the bug that can't parse raw_trace_func 2021-08-04 17:49:26 -04:00
.gitignore certs: move scripts/extract-cert to certs/ 2022-01-08 18:28:21 +09:00
adjust_autoksyms.sh kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
as-version.sh kbuild: Switch to 'f' variants of integrated assembler flag 2021-09-03 08:17:20 +09:00
asn1_compiler.c
bin2c.c
bloat-o-meter scripts: switch explicitly to Python 3 2021-01-22 06:34:44 +09:00
bootgraph.pl
bpf_doc.py bpf: Add verifier support for dynptrs 2022-05-23 14:30:17 -07:00
cc-can-link.sh
cc-version.sh kbuild: collect minimum tool versions into scripts/min-tool-version.sh 2021-04-25 05:14:26 +09:00
check_extable.sh scripts: check_extable: fix typo in user error message 2021-09-08 11:50:28 -07:00
check-blacklist-hashes.awk certs: Check that builtin blacklist hashes are valid 2022-05-23 18:47:49 +03:00
check-local-export kbuild: check static EXPORT_SYMBOL* by script instead of modpost 2022-06-01 23:07:02 +09:00
check-sysctl-docs
checkdeclares.pl scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
checkincludes.pl
checkkconfigsymbols.py checkkconfigsymbols.py: Remove skipping of help lines in parse_kconfig_file 2021-09-19 10:13:03 +09:00
checkpatch.pl checkpatch: add new alloc functions to alloc with multiplies check 2022-04-26 01:30:33 -05:00
checkstack.pl scripts/checkstack.pl: fix arm sp regex 2020-05-26 00:03:16 +09:00
checksyscalls.sh checksyscalls: ignore -Wunused-macros 2022-05-08 03:16:59 +09:00
checkversion.pl scripts: checkversion: modernize linux/version.h search strings 2021-08-05 20:55:39 +09:00
cleanfile
cleanpatch
coccicheck scripts: coccicheck: fix troubles on non-English builds 2021-05-18 11:09:59 +02:00
config kconfig: config script: add a little user help 2021-01-04 10:38:11 +09:00
const_structs.checkpatch const_structs.checkpatch: add frequently used ops structs 2022-01-20 08:52:54 +02:00
decode_stacktrace.sh scripts/decode_stacktrace.sh: indicate 'auto' can be used for base path 2021-07-08 11:48:22 -07:00
decodecode scripts/decodecode: fix faulting instruction no print when opps.file is DOS format 2021-11-06 13:30:32 -07:00
depmod.sh depmod: handle the case of /sbin/depmod without /sbin in PATH 2021-01-01 12:26:39 -08:00
dev-needs.sh scripts/dev-needs: Add script to list device dependencies 2020-09-04 18:19:37 +02:00
diffconfig scripts: switch explicitly to Python 3 2021-01-22 06:34:44 +09:00
documentation-file-ref-check scripts: documentation-file-ref-check: fix bpf selftests path 2021-10-26 09:42:29 -06:00
export_report.pl modpost: move the namespace field in Module.symvers last 2020-03-17 08:59:03 +09:00
extract_xc3028.pl
extract-ikconfig
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux
faddr2line scripts/faddr2line: Fix overlapping text section failures 2022-05-12 12:07:11 -07:00
file-size.sh
find-unused-docs.sh
gcc-goto.sh
gcc-ld
gcc-x86_32-has-stack-protector.sh x86/stackprotector/32: Make the canary into a regular percpu variable 2021-03-08 13:19:05 +01:00
gcc-x86_64-has-stack-protector.sh
gen_autoksyms.sh kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
gen_ksymdeps.sh kbuild: redo fake deps at include/ksym/*.h 2021-09-03 08:17:21 +09:00
gen-randstruct-seed.sh randstruct: Move seed generation into scripts/basic/ 2022-05-08 01:33:07 -07:00
generate_initcall_order.pl init: lto: ensure initcall ordering 2021-01-14 08:21:09 -08:00
get_abi.pl Some late-arriving documentation improvements. This is mostly build-system 2022-03-31 12:10:42 -07:00
get_dvb_firmware
get_feat.pl scripts/get_feat.pl: allow output the parsed file names 2022-03-28 13:53:46 -06:00
get_maintainer.pl get_maintainer: don't remind about no git repo when --nogit is used 2022-01-20 08:52:53 +02:00
gfp-translate
headerdep.pl
headers_install.sh Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
insert-sys-cert.c
install.sh kbuild: factor out the common installation code into scripts/install.sh 2022-05-11 21:45:53 +09:00
jobserver-exec scripts/jobserver-exec: Fix a typo ("envirnoment") 2021-05-17 12:10:03 +09:00
kallsyms.c scripts/kallsyms: update usage message of the kallsyms program 2022-05-27 15:51:48 +09:00
Kbuild.include kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Kconfig.include kbuild: check the minimum assembler version in Kconfig 2021-04-25 05:14:41 +09:00
kernel-doc scripts/kernel-doc: change the line number meta info 2022-03-28 13:53:46 -06:00
ld-version.sh kbuild: collect minimum tool versions into scripts/min-tool-version.sh 2021-04-25 05:14:26 +09:00
leaking_addresses.pl leaking_addresses: Always print a trailing newline 2021-10-15 11:25:13 +02:00
Lindent
link-vmlinux.sh kbuild: do not try to parse *.cmd files for objects provided by compiler 2022-05-29 18:36:41 +09:00
Makefile kbuild: Allow kernel installation packaging to override pkg-config 2022-04-05 17:03:31 +09:00
Makefile.asm-generic kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.build kbuild: check static EXPORT_SYMBOL* by script instead of modpost 2022-06-01 23:07:02 +09:00
Makefile.clang um: Allow builds with Clang 2022-03-21 08:13:03 -07:00
Makefile.clean kbuild: drop $(objtree)/ prefix support for clean-files 2022-05-08 03:17:00 +09:00
Makefile.compiler kbuild: remove TMPO from try-run 2021-04-25 05:25:56 +09:00
Makefile.debug kbuild: split DEBUG_CFLAGS out to scripts/Makefile.debug 2021-10-24 13:48:33 +09:00
Makefile.dtbinst kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.extrawarn kbuild: support W=e to make build abort in case of warning 2022-05-08 03:16:59 +09:00
Makefile.gcc-plugins randstruct: Split randstruct Makefile and CFLAGS 2022-05-08 01:33:06 -07:00
Makefile.headersinst kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.host kbuild: sort hostprogs before passing it to ifneq 2020-08-10 01:32:59 +09:00
Makefile.kasan kasan: always respect CONFIG_KASAN_STACK 2021-09-24 16:13:35 -07:00
Makefile.kcov kbuild: include scripts/Makefile.* only when relevant CONFIG is enabled 2020-08-10 01:32:59 +09:00
Makefile.kcsan kcsan: Ignore GCC 11+ warnings about TSan runtime support 2021-12-09 16:42:27 -08:00
Makefile.lib kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Makefile.modfinal kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Makefile.modinst kbuild: do not quote string values in include/config/auto.conf 2022-01-08 18:03:57 +09:00
Makefile.modpost kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Makefile.package kbuild: Add make tarzst-pkg build option 2021-10-12 11:50:46 +09:00
Makefile.randstruct randstruct: Enable Clang support 2022-05-08 01:33:07 -07:00
Makefile.ubsan ubsan: remove CONFIG_UBSAN_OBJECT_SIZE 2022-01-20 08:52:55 +02:00
Makefile.userprogs kbuild: add infrastructure to build userspace programs 2020-05-17 18:52:01 +09:00
Makefile.vmlinux kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS 2022-05-24 16:33:20 +09:00
makelst
markup_oops.pl
min-tool-version.sh scripts/min-tool-version.sh: raise minimum clang version to 14.0.0 for s390 2022-05-17 15:16:29 +02:00
mkcompile_h sched/preempt: Tell about PREEMPT_DYNAMIC on kernel headers 2022-03-11 15:36:35 +01:00
mksysmap mksysmap: Fix the mismatch of '.L' symbols in System.map 2020-06-06 23:39:20 +09:00
mkuboot.sh
module.lds.S module: combine constructors in module linker script 2021-07-19 14:51:40 +02:00
modules-check.sh kbuild: check module name conflict for external modules as well 2021-04-25 05:22:42 +09:00
nsdeps kbuild: replace LANG=C with LC_ALL=C 2021-05-02 00:43:35 +09:00
objdiff
objdump-func scripts: Create objdump-func helper script 2022-05-12 10:08:43 -07:00
pahole-flags.sh scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading. 2022-02-22 14:32:44 -08:00
pahole-version.sh kbuild: Add CONFIG_PAHOLE_VERSION 2022-02-02 11:19:33 +01:00
parse-maintainers.pl parse-maintainers: Do not sort section content by default 2020-03-26 15:08:27 -07:00
patch-kernel
profile2linkerlist.pl
prune-kernel scripts/prune-kernel: Use kernel-install if available 2022-05-11 21:46:38 +09:00
recordmcount.c ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount 2021-03-02 17:27:18 -05:00
recordmcount.h recordmcount: Correct st_shndx handling 2021-06-18 09:09:17 -04:00
recordmcount.pl nds32: Remove the architecture 2022-03-07 13:54:59 +01:00
remove-stale-files Kbuild updates for v5.17 2022-01-19 11:15:19 +02:00
setlocalversion kbuild: do not quote string values in include/config/auto.conf 2022-01-08 18:03:57 +09:00
show_delta tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
sign-file.c
sorttable.c s390/extable: convert to relative table with data 2022-03-08 00:33:00 +01:00
sorttable.h script/sorttable: Fix some initialization problems 2022-01-18 10:17:18 -05:00
spdxcheck-test.sh scripts/spdxcheck-test.sh: Drop python2 2021-07-21 15:59:32 +02:00
spdxcheck.py spdxcheck.py: Fix a type error 2022-02-04 16:43:01 +01:00
spelling.txt scripts/spelling.txt: add more spellings to spelling.txt 2022-03-22 15:57:00 -07:00
sphinx-pre-install scripts: sphinx-pre-install: Fix ctex support on Debian 2022-01-07 09:33:13 -07:00
split-man.pl tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
stackdelta
stackusage
subarch.include parisc: Fix compile failure when building 64-bit kernel natively 2021-09-01 21:52:02 +02:00
syscallhdr.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
syscallnr.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
syscalltbl.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
tags.sh scripts/tags: add space regexs to all regex_c 2021-11-26 16:58:55 +01:00
test_fortify.sh fortify: Update compile-time tests for Clang 14 2022-02-13 16:50:06 -08:00
tools-support-relr.sh Makefile: fix GDB warning with CONFIG_RELR 2021-06-08 13:09:34 +01:00
unifdef.c
ver_linux Removed the oprofiled version option 2021-05-03 17:23:06 -06:00
xen-hypercalls.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
xz_wrap.sh kbuild: add variables for compression tools 2020-06-06 23:42:01 +09:00