Josh Poimboeuf dd590d4d57 objtool/klp: Introduce klp diff subcommand for diffing object files ... Add a new klp diff subcommand which performs a binary diff between two object files and extracts changed functions into a new object which can then be linked into a livepatch module. This builds on concepts from the longstanding out-of-tree kpatch [1] project which began in 2012 and has been used for many years to generate livepatch modules for production kernels. However, this is a complete rewrite which incorporates hard-earned lessons from 12+ years of maintaining kpatch. Key improvements compared to kpatch-build: - Integrated with objtool: Leverages objtool's existing control-flow graph analysis to help detect changed functions. - Works on vmlinux.o: Supports late-linked objects, making it compatible with LTO, IBT, and similar. - Simplified code base: ~3k fewer lines of code. - Upstream: No more out-of-tree #ifdef hacks, far less cruft. - Cleaner internals: Vastly simplified logic for symbol/section/reloc inclusion and special section extraction. - Robust __LINE__ macro handling: Avoids false positive binary diffs caused by the __LINE__ macro by introducing a fix-patch-lines script (coming in a later patch) which injects #line directives into the source .patch to preserve the original line numbers at compile time. Note the end result of this subcommand is not yet functionally complete. Livepatch needs some ELF magic which linkers don't like: - Two relocation sections (.rela*, .klp.rela*) for the same text section. - Use of SHN_LIVEPATCH to mark livepatch symbols. Unfortunately linkers tend to mangle such things. To work around that, klp diff generates a linker-compliant intermediate binary which encodes the relevant KLP section/reloc/symbol metadata. After module linking, a klp post-link step (coming soon) will clean up the mess and convert the linked .ko into a fully compliant livepatch module. Note this subcommand requires the diffed binaries to have been compiled with -ffunction-sections and -fdata-sections, and processed with 'objtool --checksum'. Those constraints will be handled by a klp-build script introduced in a later patch. Without '-ffunction-sections -fdata-sections', reliable object diffing would be infeasible due to toolchain limitations: - For intra-file+intra-section references, the compiler might occasionally generated hard-coded instruction offsets instead of relocations. - Section-symbol-based references can be ambiguous: - Overlapping or zero-length symbols create ambiguity as to which symbol is being referenced. - A reference to the end of a symbol (e.g., checking array bounds) can be misinterpreted as a reference to the next symbol, or vice versa. A potential future alternative to '-ffunction-sections -fdata-sections' would be to introduce a toolchain option that forces symbol-based (non-section) relocations. Acked-by: Petr Mladek <pmladek@suse.com> Tested-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>		2025-10-14 14:50:18 -07:00
..
atomic	rust: Introduce atomic API helpers	2025-09-15 09:38:32 +02:00
bash-completion	kbuild: add Kbuild bash completion	2025-03-15 21:22:52 +09:00
basic	integer-wrap: Force full rebuild when .scl file changes	2025-05-08 09:42:06 -07:00
clang-tools	gen_compile_commands.py: remove code for '\#' replacement	2025-03-15 21:16:21 +09:00
coccinelle	Patch series in this pull request:	2025-10-02 18:44:54 -07:00
crypto	lib/crypto: tests: Add KUnit tests for BLAKE2s	2025-08-29 09:50:19 -07:00
dtc	scripts: dt_to_config: fix grammar and a typo in --help text	2025-09-26 15:53:30 -05:00
dummy-tools	…
gcc-plugins	gcc-plugins: Remove TODO_verify_il for GCC >= 16	2025-09-23 13:59:39 -07:00
gdb	hrtimer: Remove hrtimer_clock_base:: Get_time	2025-09-09 12:27:18 +02:00
gendwarfksyms	gendwarfksyms: order -T symtypes output by name	2025-07-26 15:31:30 +09:00
genksyms	genksyms: Fix enum consts from a reference affecting new values	2025-06-07 14:38:07 +09:00
include	scripts: import more list macros	2024-10-07 02:12:27 +09:00
ipe	scripts: ipe: polgen: remove redundant close and error exit path	2024-11-19 13:57:03 -08:00
kconfig	kconfig: Avoid prompting for transitional symbols	2025-10-07 08:21:23 -07:00
ksymoops	…
lib	docs: kdoc: a few more dump_typedef() tweaks	2025-09-18 10:19:54 -06:00
mod	modpost: Ignore unresolved section bounds symbols	2025-10-14 14:45:22 -07:00
package	kbuild: rpm-pkg: Add (elfutils-devel or libdw-devel) to BuildRequires	2025-05-12 15:03:17 +09:00
selinux	docs: Remove remainders of reiserfs	2025-08-18 10:45:43 -06:00
tracing	scripts/tracing: Remove scripts/tracing/draw_functrace.py	2025-03-20 07:02:21 -04:00
.gitignore	lib: packing: add pack_fields() and unpack_fields()	2024-12-11 20:13:00 -08:00
Kbuild.include	kbuild: add $(objtree)/ prefix to some in-kernel build artifacts	2024-11-27 09:38:27 +09:00
Kconfig.include	kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION`	2024-10-13 22:22:28 +02:00
Lindent	…
Makefile	Kbuild updates for v6.14	2025-01-31 12:07:07 -08:00
Makefile.asm-headers	kbuild: fix rebuild of generic syscall headers	2024-07-18 10:01:55 -07:00
Makefile.autofdo	AutoFDO: Enable machine function split optimization for AutoFDO	2024-11-27 09:38:27 +09:00
Makefile.btf	kbuild, bpf: Enable --btf_features=attributes	2025-04-15 11:17:50 -07:00
Makefile.build	Rust changes for v6.17	2025-08-03 13:49:10 -07:00
Makefile.clang	kbuild: clang: Support building UM with SUBARCH=i386	2025-03-04 09:40:13 -08:00
Makefile.clean	kbuild: change working directory to external module directory with M=	2024-11-28 08:10:23 +09:00
Makefile.compiler	require gcc-8 and binutils-2.30	2025-05-31 08:16:52 -07:00
Makefile.debug	kbuild: rust: use `-Zdebuginfo-compression`	2024-04-02 17:41:22 +02:00
Makefile.defconf	kbuild: suppress stdout from merge_config for silent builds	2025-01-10 23:01:21 +09:00
Makefile.dtbinst	kbuild: Install dtb files as 0644 in Makefile.dtbinst	2024-06-26 00:18:57 +09:00
Makefile.dtbs	scripts/dtc: Update to upstream version v1.7.2-35-g52f07dcca47c	2025-08-11 08:08:51 -05:00
Makefile.extrawarn	scripts/Makefile.extrawarn: Respect CONFIG_WERROR / W=e for hostprogs	2025-10-07 09:46:04 -07:00
Makefile.gcc-plugins	stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS	2025-07-21 21:40:57 -07:00
Makefile.headersinst	…
Makefile.host	kbuild: support building external modules in a separate build directory	2024-11-28 08:11:55 +09:00
Makefile.kasan	kasan: fix GCC mem-intrinsic prefix with sw tags	2025-08-27 22:45:43 -07:00
Makefile.kcov	- The 2 patch series "zram: support algorithm-specific parameters" from	2025-06-02 16:00:26 -07:00
Makefile.kcsan	…
Makefile.kmsan	…
Makefile.kstack_erase	kstack_erase: Fix missed export of renamed KSTACK_ERASE_CFLAGS	2025-07-29 17:17:46 -07:00
Makefile.lib	objtool: Rename --Werror to --werror	2025-10-14 14:46:48 -07:00
Makefile.modfinal	kbuild: re-enable KCSAN for autogenerated *.mod.c intermediaries	2024-11-28 08:11:55 +09:00
Makefile.modinst	kbuild: Fix signing issue for external modules	2025-01-18 08:52:09 +09:00
Makefile.modpost	modpost: Allow extended modversions without basic MODVERSIONS	2025-01-11 02:36:32 +09:00
Makefile.package	kbuild: rpm-pkg: disable kernel-devel package when cross-compiling	2024-10-31 21:40:46 +09:00
Makefile.propeller	kbuild: Fix Propeller build option	2024-11-27 09:38:27 +09:00
Makefile.randstruct	…
Makefile.ubsan	ARM:	2025-05-29 08:10:01 -07:00
Makefile.userprogs	…
Makefile.vdsoinst	more s390 updates for 6.10 merge window	2024-05-21 12:09:36 -07:00
Makefile.vmlinux	kbuild: Use '--strip-unneeded-symbol' for removing module device table symbols	2025-10-10 14:50:35 -07:00
Makefile.vmlinux_o	objtool: Rename --Werror to --werror	2025-10-14 14:46:48 -07:00
as-version.sh	…
asn1_compiler.c	…
bloat-o-meter	…
bootgraph.pl	…
bpf_doc.py	bpf: Finish constification of 1st parameter of bpf_d_path()	2025-10-04 09:05:23 -07:00
build-version	kbuild: move init/build-version to scripts/	2024-07-16 01:08:37 +09:00
cc-can-link.sh	…
cc-version.sh	…
check-git	…
check-sysctl-docs	docs: Replace spaces with tabs in check-sysctl-docs	2025-07-23 11:57:05 +02:00
check-uapi.sh	…
check-variable-fonts.sh	docs: scripts/check-variable-fonts.sh: Improve commands for detection	2024-05-02 10:14:52 -06:00
check_extable.sh	…
checkdeclares.pl	…
checkincludes.pl	…
checkkconfigsymbols.py	…
checkpatch.pl	checkpatch: suppress strscpy warnings for userspace tools	2025-09-28 11:36:13 -07:00
checkstack.pl	…
checksyscalls.sh	…
checktransupdate.py	scripts: add origin commit identification based on specific patterns	2025-07-24 08:41:15 -06:00
checkversion.pl	…
cleanfile	…
cleanpatch	…
coccicheck	kbuild: change working directory to external module directory with M=	2024-11-28 08:10:23 +09:00
config	kbuild: fix argument parsing in scripts/config	2025-03-15 21:22:42 +09:00
const_structs.checkpatch	const_structs.checkpatch: add bin_attribute	2025-06-17 10:44:07 +02:00
decode_stacktrace.sh	scripts/decode_stacktrace.sh: code: preserve alignment	2025-09-21 14:22:28 -07:00
decodecode	…
depmod.sh	kbuild: add $(objtree)/ prefix to some in-kernel build artifacts	2024-11-27 09:38:27 +09:00
dev-needs.sh	…
diffconfig	…
documentation-file-ref-check	scripts/documentation-file-ref-check: don't check perl/python scripts	2025-02-10 11:19:56 -07:00
extract-fwblobs	scripts: add script to extract built-in firmware blobs	2025-03-16 22:30:46 -07:00
extract-ikconfig	…
extract-module-sig.pl	…
extract-sys-certs.pl	…
extract-vmlinux	extract-vmlinux: Output used decompression method	2025-08-28 15:25:48 -07:00
extract_xc3028.pl	…
faddr2line	scripts/faddr2line: Fix "Argument list too long" error	2025-10-14 14:45:20 -07:00
file-size.sh	…
find-unused-docs.sh	scripts/kernel-doc.py: don't create *.pyc files	2025-04-24 10:12:46 -06:00
gen-crc-consts.py	riscv/crc: add "template" for Zbc optimized CRC functions	2025-03-10 09:29:08 -07:00
gen-randstruct-seed.sh	…
gen_packed_field_checks.c	lib: packing: add pack_fields() and unpack_fields()	2024-12-11 20:13:00 -08:00
generate_builtin_ranges.awk	kbuild: exclude .rodata.(cst|str)* when building ranges	2025-03-15 21:22:52 +09:00
generate_initcall_order.pl	…
generate_rust_analyzer.py	rust: add `pin-init` as a dependency to `bindings` and `uapi`	2025-09-08 13:42:39 +02:00
generate_rust_target.rs	rust: support Rust >= 1.91.0 target spec	2025-08-31 23:34:34 +02:00
get_abi.py	scripts/get_abi.py: add support for undefined ABIs	2025-02-10 11:19:57 -07:00
get_dvb_firmware	…
get_feat.pl	scripts: get_feat.pl: substitute s390x with s390	2025-03-12 16:25:50 -06:00
get_maintainer.pl	get_maintainer: stop reporting subsystem status as maintainer role	2025-03-16 22:30:49 -07:00
gfp-translate	scripts: fix gfp-translate after ___GFP_*_BITS conversion to an enum	2024-09-01 17:59:01 -07:00
git-resolve.sh	git-resolve: add SPDX and copyright line	2025-04-25 15:54:24 +02:00
git.orderFile	…
head-object-list.txt	openrisc: place exception table at the head of vmlinux	2024-12-10 12:04:19 +00:00
headerdep.pl	…
headers_install.sh	uapi: wrap compiler_types.h in an ifdef instead of the implicit strip	2025-08-28 13:06:48 +02:00
insert-sys-cert.c	…
install.sh	kbuild: Create INSTALL_PATH directory if it does not exist	2024-07-20 13:34:54 +09:00
integer-wrap-ignore.scl	ubsan/overflow: Enable ignorelist parsing and add type filter	2025-03-07 19:58:05 -08:00
jobserver-exec	…
kallsyms.c	kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU	2025-02-18 10:16:04 +01:00
kernel-doc	scripts/kernel-doc: switch to use kernel-doc.py	2025-04-09 12:10:34 -06:00
kernel-doc.pl	scripts: kernel-doc: fix parsing function-like typedefs (again)	2025-04-09 12:10:34 -06:00
kernel-doc.py	docs: kernel-doc: avoid script crash on ancient Python	2025-08-11 10:54:29 -06:00
ld-version.sh	kbuild: Make ld-version.sh more robust against version string changes	2024-07-15 03:13:32 +09:00
leaking_addresses.pl	…
link-vmlinux.sh	kbuild: vmlinux.unstripped should always depend on .vmlinux.export.o	2025-09-24 09:10:45 -07:00
macro_checker.py	scripts: add macro_checker script to check unused parameters in macros	2024-09-01 20:43:28 -07:00
make_fit.py	scripts/make_fit: Print DT name before libfdt errors	2025-03-27 14:03:32 -05:00
makelst	…
markup_oops.pl	…
min-tool-version.sh	kbuild: Bump minimum version of LLVM for building the kernel to 15.0.0	2025-08-28 16:58:43 -07:00
misc-check	scripts/misc-check: update export checks for EXPORT_SYMBOL_FOR_MODULES()	2025-08-26 12:00:17 -07:00
mkcompile_h	…
mksysmap	modpost: Create modalias for builtin modules	2025-09-24 09:10:45 -07:00
mkuboot.sh	…
module-common.c	kbuild: compile constant module information only once	2024-09-07 17:24:08 +09:00
module.lds.S	objtool/klp: Introduce klp diff subcommand for diffing object files	2025-10-14 14:50:18 -07:00
modules-check.sh	…
nsdeps	scripts/nsdeps: get 'make nsdeps' working again	2024-12-03 08:22:25 -08:00
objdiff	…
objdump-func	…
orc_hash.sh	…
pahole-version.sh	…
parse-maintainers.pl	…
patch-kernel	…
profile2linkerlist.pl	…
prune-kernel	…
recordmcount.c	…
recordmcount.h	…
recordmcount.pl	tracing: Remove redundant config HAVE_FTRACE_MCOUNT_RECORD	2025-07-22 20:15:56 -04:00
relocs_check.sh	…
remove-stale-files	selinux: move genheaders to security/selinux/	2024-10-03 16:07:51 -04:00
rust_is_available.sh	rust: document `bindgen` 0.71.0 regression	2025-01-10 00:17:00 +01:00
rust_is_available_bindgen_0_66.h	rust: warn about `bindgen` versions 0.66.0 and 0.66.1	2024-07-10 10:28:52 +02:00
rust_is_available_bindgen_libclang.h	…
rust_is_available_bindgen_libclang_concat.h	rust: warn on bindgen < 0.69.5 and libclang >= 19.1	2024-11-12 21:26:54 +01:00
rust_is_available_test.py	rust: warn on bindgen < 0.69.5 and libclang >= 19.1	2024-11-12 21:26:54 +01:00
rustc-llvm-version.sh	kbuild: rust: avoid errors with old `rustc`s without LLVM patch version	2024-10-28 00:27:16 +01:00
rustc-version.sh	kbuild: rust: add `CONFIG_RUSTC_VERSION`	2024-09-05 22:44:18 +02:00
rustdoc_test_builder.rs	rust: use absolute paths in macros referencing core and kernel	2025-05-23 00:12:14 +02:00
rustdoc_test_gen.rs	rust: kunit: use `kernel::{fmt,prelude::fmt!}`	2025-09-16 09:26:59 +02:00
setlocalversion	setlocalversion: add -e option	2024-11-28 08:11:56 +09:00
show_delta	scripts: make python shebangs specific about desired version	2025-03-15 21:19:44 +09:00
sign-file.c	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
sorttable.c	scripts/sorttable: Fix endianness handling in build-time mcount sort	2025-04-02 09:51:26 -04:00
spdxcheck-test.sh	…
spdxcheck.py	scripts/spdxcheck: Handle license identifiers in Jinja comments	2025-01-08 15:38:33 +01:00
spdxexclude	…
spelling.txt	scripts/spelling.txt: add notifer||notifier to spelling.txt	2025-08-02 12:01:40 -07:00
sphinx-build-wrapper	scripts: sphinx-build-wrapper: get rid of uapi/media Makefile	2025-08-29 15:54:43 -06:00
sphinx-pre-install	scripts/sphinx-pre-install: fix Archlinux PDF dependencies	2025-08-21 14:08:53 -06:00
split-man.pl	…
ssl-common.h	sign-file,extract-cert: avoid using deprecated ERR_get_error_line()	2024-09-20 19:49:52 +03:00
stackdelta	…
stackusage	…
subarch.include	scripts: subarch.include: fix SUBARCH on macOS hosts	2024-09-10 13:56:37 +09:00
syscall.tbl	fs: introduce file_getattr and file_setattr syscalls	2025-07-02 17:05:17 +02:00
syscallhdr.sh	…
syscallnr.sh	…
syscalltbl.sh	x86/syscall: Mark exit[_group] syscall handlers __noreturn	2024-06-28 15:23:38 +02:00
tags.sh	scripts/tags.sh: allow to use alternative ctags implementation	2025-06-06 05:40:25 +09:00
test_doc_build.py	scripts: test_doc_build.py: regroup and rename arguments	2025-06-25 12:22:48 -06:00
tools-support-relr.sh	…
unifdef.c	scripts/unifdef: avoid constexpr keyword	2024-04-23 00:09:41 +09:00
ver_linux	ver_linux: Remove checks for reiserfsprogs.	2025-06-09 14:53:16 -06:00
verify_builtin_ranges.awk	scripts: add verifier script for builtin module range data	2024-09-20 09:21:52 +09:00
xen-hypercalls.sh	…
xz_wrap.sh	xz: adjust arch-specific options for better kernel compression	2024-09-01 20:43:27 -07:00