Fangrui Song
41cc72a0d5
BACKPORT: bpf: Support llvm-objcopy for vmlinux BTF ...
commit 90ceddcb495008ac8ba7a3dce297841efcd7d584 upstream.
Simplify gen_btf logic to make it work with llvm-objcopy. The existing
'file format' and 'architecture' parsing logic is brittle and does not
work with llvm-objcopy/llvm-objdump.
'file format' output of llvm-objdump>=11 will match GNU objdump, but
'architecture' (bfdarch) may not.
.BTF in .tmp_vmlinux.btf is non-SHF_ALLOC. Add the SHF_ALLOC flag
because it is part of vmlinux image used for introspection. C code
can reference the section via linker script defined __start_BTF and
__stop_BTF. This fixes a small problem that previous .BTF had the
SHF_WRITE flag (objcopy -I binary -O elf* synthesized .data).
Additionally, `objcopy -I binary` synthesized symbols
_binary__btf_vmlinux_bin_start and _binary__btf_vmlinux_bin_stop (not
used elsewhere) are replaced with more commonplace __start_BTF and
__stop_BTF.
Add 2>/dev/null because GNU objcopy (but not llvm-objcopy) warns
"empty loadable segment detected at vaddr=0xffffffff81000000, is this intentional?"
We use a dd command to change the e_type field in the ELF header from
ET_EXEC to ET_REL so that lld will accept .btf.vmlinux.bin.o. Accepting
ET_EXEC as an input file is an extremely rare GNU ld feature that lld
does not intend to support, because this is error-prone.
The output section description .BTF in include/asm-generic/vmlinux.lds.h
avoids potential subtle orphan section placement issues and suppresses
--orphan-handling=warn warnings.
Fixes: df786c9b9476 ("bpf: Force .BTF section start to zero when dumping from vmlinux")
Fixes: cb0cc635c7a9 ("powerpc: Include .BTF section")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Change-Id: I145b50cfe3e0e1e034fb750cf55642905382a06c
Signed-off-by: Fangrui Song <maskray@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Stanislav Fomichev <sdf@google.com>
Tested-by: Andrii Nakryiko <andriin@fb.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Link: https://github.com/ClangBuiltLinux/linux/issues/871
Link: https://lore.kernel.org/bpf/20200318222746.173648-1-maskray@google.com
Signed-off-by: Maria Teguiani <teguiani@google.com>
Tested-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
2026-05-15 17:58:11 +07:00
fixdep: faster CONFIG_ search
2016-08-24 22:34:19 +02:00
fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock
2019-06-11 12:22:49 +02:00
Merge remote-tracking branch 'common/android-4.9-q' into android12-4.9-sdm845
2022-03-31 22:52:51 +03:00
gcc-plugins: latent_entropy: use /dev/urandom
2022-04-20 09:06:46 +02:00
scripts/gdb: fix lx-version string output
2021-01-12 19:49:03 +01:00
kbuild: Regenerate genksyms lexer
2016-08-25 20:03:51 +02:00
kconfig/lxdialog: Make main() return 0
2024-10-09 17:15:11 +03:00
This is the 4.9.321 stable release
2022-07-03 10:09:05 +02:00
builddeb: Fix header package regarding dtc source links
2018-05-30 07:50:39 +02:00
selinux: use "grep -E" instead of "egrep"
2022-10-26 13:15:38 +02:00
scripts/tracing: fix the bug that can't parse raw_trace_func
2021-08-15 13:01:03 +02:00
kbuild: make scripts/adjust_autoksyms.sh robust against timestamp races
2018-05-30 07:50:37 +02:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
scripts: switch explicitly to Python 3
2021-06-03 08:23:27 +02:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
BACKPORT: bpf: add script and prepare bpf.h for new helpers documentation
2026-05-15 17:56:21 +07:00
scripts: build-all.py: set clang as REAL_CC for arm
2020-02-27 21:25:17 -08:00
scripts: snapshot of kernel build utility scripts
2016-08-08 15:22:37 -07:00
scripts: snapshot of kernel build utility scripts
2016-08-08 15:22:37 -07:00
scripts: snapshot of kernel build utility scripts
2016-08-08 15:22:37 -07:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
checkkconfigsymbols: use arglist instead of cmd string
2016-08-28 11:08:34 +02:00
Merge tag 'LA.UM.10.3.r1-01000-sdm845.0' of https://source.codeaurora.org/quic/la/kernel/msm-4.9 into android12-4.9-sdm845
2022-03-31 20:16:10 +03:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple
2018-11-28 17:35:40 -08:00
FROMLIST: kbuild: add clang-version.sh
2018-02-28 15:09:57 -08:00
coccinelle: fix parallel build with CHECK=scripts/coccicheck
2017-12-14 09:28:22 +01:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
const_structs.checkpatch: remove drm_connector from the list
2018-02-04 21:39:49 -08:00
scripts/decode_stacktrace: strip basepath from all paths
2020-07-31 16:44:03 +02:00
scripts/decodecode: fix trapping instruction formatting
2020-05-20 08:15:29 +02:00
depmod: handle the case of /sbin/depmod without /sbin in PATH
2021-01-12 19:49:01 +01:00
scripts: switch explicitly to Python 3
2021-06-03 08:23:27 +02:00
docproc: print a comment about autogeneration for rst output
2016-05-14 09:56:56 -06:00
cert host tools: Stop complaining about deprecated OpenSSL functions
2022-11-25 17:35:37 +01:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
scripts/faddr2line: improve on base path filtering a bit
2016-09-19 14:49:08 -07:00
gcc-plugins: abort builds cleanly when not supported
2016-08-08 17:49:05 -07:00
scripts/has-stack-protector: add -fno-PIE
2016-11-09 22:28:05 +01:00
initramfs: Escape colons in depfile
2016-09-23 10:35:32 +02:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
get_maintainer: quiet noisy implicit -f vcs_file_exists checking
2016-08-26 17:39:34 -07:00
headers_check: don't warn about c++ guards
2016-05-24 14:12:48 +10:00
scripts/kallsyms: remove redundant is_arm_mapping_symbol()
2026-05-15 17:48:21 +07:00
arm64: build with baremetal linker target instead of Linux when available
2022-10-13 01:53:43 +03:00
scripts/kernel-doc: Don't fail with status != 0 if error encountered with -none
2018-02-25 11:05:47 +01:00
ld-version: Drop the 4th and 5th version components
2016-05-13 14:02:05 +02:00
BACKPORT: bpf: Support llvm-objcopy for vmlinux BTF
2026-05-15 17:58:11 +07:00
scripts: set proper OpenSSL include dir also for sign-file
2021-03-07 11:25:55 +01:00
kbuild: replace genhdr-y with generated-y
2020-04-09 15:53:27 +05:30
Merge branch 'android-4.9-q' of https://android.googlesource.com/kernel/common into lineage-18.1-caf-sdm845
2021-04-26 01:27:02 +03:00
ANDROID: kbuild: Makefile.clean: make Kbuild and Makefile optional
2017-01-27 13:52:26 -08:00
scripts: Makefile: Add multi overlay dtbo-base apply verify
2017-11-24 16:56:41 +08:00
Makefile.extrawarn: Move -Wcast-function-type-strict to W=1
2022-10-26 13:15:33 +02:00
gcc-plugins: Add latent_entropy plugin
2016-10-10 14:51:44 -07:00
kbuild: skip install/check of headers right under uapi directories
2020-04-09 16:19:34 +05:30
kbuild: use HOSTLDFLAGS for single .c executables
2022-10-13 01:53:40 +03:00
This is the 4.9.121 stable release
2018-08-17 21:31:08 +02:00
dtc: Silence warnings
2022-10-13 01:53:45 +03:00
ANDROID: kbuild: make it possible to specify the module output dir
2017-01-27 13:52:26 -08:00
This is the 4.9.327 stable release
2022-09-05 14:02:59 +02:00
Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"
2016-11-11 08:45:08 -08:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
scripts: Support a custom compiler name
2026-05-15 17:48:21 +07:00
mksysmap: Fix the mismatch of '.L' symbols in System.map
2020-06-30 15:38:23 -04:00
objtool, modules: Discard objtool annotation sections for modules
2018-01-17 09:38:58 +01:00
namespace: fix namespace.pl script to support relative paths
2019-10-29 09:15:06 +01:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
This is the 4.9.262 stable release
2021-03-17 17:12:54 +01:00
recordmcount: Fix spurious mcount entries on powerpc
2019-08-04 09:33:38 +02:00
recordmcount.pl: fix typo in s390 mcount regex
2022-01-05 12:31:24 +01:00
script: Do not append a plus behind the localversion
2026-05-15 17:48:21 +07:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
cert host tools: Stop complaining about deprecated OpenSSL functions
2022-11-25 17:35:37 +01:00
spelling.txt: "modeled" is spelt correctly
2016-10-07 18:46:30 -07:00
tweewide: Fix most Shebang lines
2021-06-03 08:23:27 +02:00
BACKPORT: mm: split page_type out from _mapcount
2026-05-15 17:57:58 +07:00
unifdef: use memcpy instead of strncpy
2018-12-08 13:05:05 +01:00
ver_linux: rename ver_linux.awk to ver_linux
2016-08-31 13:59:31 +02:00
41cc72a0d5