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Ard Biesheuvel a081b57892
kallsyms: Get rid of kallsyms relative base 
When the kallsyms relative base was introduced, per-CPU variable
references on x86_64 SMP were implemented as offsets into the respective
per-CPU region, rather than offsets relative to the location of the
variable's template in the kernel image, which is how other
architectures implement it.

This required kallsyms to reason about the difference between the two,
and the sign of the value in the kallsyms_offsets[] array was used to
distinguish them. This meant that negative offsets were not permitted
for ordinary variables, and so it was crucial that the relative base was
chosen such that all offsets were positive numbers.

This is no longer needed: instead, the offsets can simply be encoded as
values in the range -/+ 2 GiB, which is precisely what PC32 relocations
provide on most architectures. So it is possible to simplify the logic,
and just use _text as the anchor directly, and let the linker calculate
the final value based on the location of the entry itself.

Some architectures (nios2, extensa) do not support place-relative
relocations at all, but these are all 32-bit and non-relocatable, and so
there is no need for place-relative relocations in the first place, and
the actual symbol values can just be stored directly.

This makes all entries in the kallsyms_offsets[] array visible as
place-relative references in the ELF metadata, which will be important
when implementing ELF-based fg-kaslr.

Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260116093359.2442297-6-ardb+git@google.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2026-01-22 15:58:22 -07:00
..
atomic atomic: Skip alignment check for try_cmpxchg() old arg 2025-10-21 12:31:56 +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 scripts/clang-tools: Handle included .c files in gen_compile_commands 2025-11-08 12:18:00 +01:00
coccinelle coccinelle: Drop pm_runtime_barrier() error code checks 2025-12-04 20:38:13 +01:00
crypto lib/crypto: tests: Add KUnit tests for POLYVAL 2025-11-11 11:07:52 -08:00
dtc scripts: dt_to_config: fix grammar and a typo in --help text 2025-09-26 15:53:30 -05:00
dummy-tools kbuild: dummy-tools: pretend we understand -fpatchable-function-entry 2023-11-01 23:24:56 +09:00
gcc-plugins gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-09-23 13:59:39 -07:00
gdb scripts/gdb/symbols: make BPF debug info available to GDB 2025-11-20 14:03:42 -08:00
gendwarfksyms gendwarfksyms: Skip files with no exports 2025-11-11 20:37:11 +01:00
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: Support conditional deps using "depends on X if Y" 2026-01-06 14:57:15 -07:00
ksymoops
livepatch objtool/klp: Only enable --checksum when needed 2025-11-18 09:59:26 +01:00
mod modpost: drop '*_probe' from section check whitelist 2025-12-16 22:12:29 +09:00
package kbuild: install-extmod-build: Properly fix CC expansion when ccache is used 2025-11-11 22:31:34 -07:00
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 scripts: add tracepoint-update to the list of ignores files 2025-10-29 08:46:05 -04:00
as-version.sh
asn1_compiler.c ASN.1: Fix check for strdup() success 2023-04-21 08:58:00 -07:00
bloat-o-meter scripts/bloat-o-meter: count weak symbol sizes 2023-08-21 13:46:25 -07:00
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 kbuild: don't enable CC_CAN_LINK if the dummy program generates warnings 2025-11-14 20:20:34 +01:00
cc-version.sh scripts: Remove ICC-related dead code 2023-04-24 10:18:32 -07:00
check-function-names.sh kbuild: Check for functions with ambiguous -ffunction-sections section names 2025-11-21 10:04:10 +01:00
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-uapi: Introduce check-uapi.sh 2023-12-29 22:25:20 +09:00
check_extable.sh
checkdeclares.pl
checkincludes.pl
checkkconfigsymbols.py
checkpatch.pl checkpatch: add uninitialized pointer with __free attribute check 2025-12-10 16:07:42 -08:00
checkstack.pl scripts/checkstack.pl: fix no space expression between sp and offset 2023-12-29 12:22:28 -08:00
checksyscalls.sh
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
container scripts: add tool to run containerized builds 2026-01-22 15:30:48 -07:00
decode_stacktrace.sh scripts/decode_stacktrace.sh: fix build ID and PC source parsing 2025-11-09 21:19:45 -08:00
decodecode scripts/decodecode: add support for LoongArch 2023-12-29 12:22:25 -08:00
depmod.sh kbuild: add $(objtree)/ prefix to some in-kernel build artifacts 2024-11-27 09:38:27 +09:00
dev-needs.sh
diffconfig
elf-parse.c sorttable: Move ELF parsing into scripts/elf-parse.[ch] 2025-10-24 16:43:14 -04:00
elf-parse.h sorttable: Move ELF parsing into scripts/elf-parse.[ch] 2025-10-24 16:43:14 -04:00
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
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: macros: support proc-macro2, quote and syn 2025-11-24 17:15:50 +01:00
generate_rust_target.rs rust: support Rust >= 1.91.0 target spec 2025-08-31 23:34:34 +02:00
get_dvb_firmware
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 scripts: Introduce a default git.orderFile 2023-12-29 22:25:20 +09:00
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 scripts: headers_install.sh: Remove two outdated config leak ignore entries 2025-11-11 16:01:13 +01:00
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 docs: Move the python libraries to tools/lib/python 2025-11-18 09:22:40 -07:00
kallsyms.c kallsyms: Get rid of kallsyms relative base 2026-01-22 15:58:22 -07:00
Kbuild.include kbuild: add $(objtree)/ prefix to some in-kernel build artifacts 2024-11-27 09:38:27 +09:00
Kconfig.include init: deduplicate cc-can-link.sh invocations 2025-11-14 20:20:34 +01:00
kernel-doc scripts/kernel-doc: switch to use kernel-doc.py 2025-04-09 12:10:34 -06:00
kernel-doc.py docs: bring some order to our Python module hierarchy 2025-11-18 09:22:40 -07:00
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 leaking_addresses: Provide mechanism to scan binary files 2024-02-29 13:38:03 -08:00
Lindent
link-vmlinux.sh kallsyms: Get rid of kallsyms relative base 2026-01-22 15:58:22 -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
Makefile tracing: Add a tracepoint verification check at build time 2025-10-24 16:43:14 -04:00
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 kbuild: Let kernel-doc.py use PYTHON3 override 2025-11-08 19:42:22 -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 kbuild: Ensure .dtbo targets are applied to a base .dtb 2025-11-17 11:27:52 -06:00
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/klp: Only enable --checksum when needed 2025-11-18 09:59:26 +01:00
Makefile.modfinal tracing: Add warnings for unused tracepoints for modules 2025-10-24 16:43:15 -04:00
Makefile.modinst kbuild: Use objtree for module signing key path 2025-11-08 12:17:58 +01:00
Makefile.modpost modpost: Allow extended modversions without basic MODVERSIONS 2025-01-11 02:36:32 +09:00
Makefile.package kbuild: Add top-level target for building gen_init_cpio 2025-12-19 14:58:11 -07:00
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 kbuild: support 'userldlibs' syntax 2023-11-01 23:26:01 +09:00
Makefile.vdsoinst more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
Makefile.vmlinux kbuild: Strip trailing padding bytes from modules.builtin.modinfo 2025-11-06 09:50:23 -07:00
Makefile.vmlinux_o kbuild: Check for functions with ambiguous -ffunction-sections section names 2025-11-21 10:04:10 +01:00
Makefile.warn kbuild: Drop superfluous compiler option checks 2026-01-14 14:22:33 -07:00
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 x86/unwind/orc: Add ELF section with ORC version identifier 2023-06-16 17:17:42 +02:00
pahole-version.sh
parse-maintainers.pl
patch-kernel
profile2linkerlist.pl
prune-kernel
recordmcount.c scripts: clean up IA-64 code 2023-12-03 18:51:48 +09:00
recordmcount.h
recordmcount.pl tracing: Remove redundant config HAVE_FTRACE_MCOUNT_RECORD 2025-07-22 20:15:56 -04:00
relocs_check.sh powerpc: Move script to check relocations at compile time in scripts/ 2023-04-19 07:46:31 -07:00
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 rustcs 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: allow clippy::disallowed_names for doctests 2025-11-17 22:53:27 +01:00
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 sorttable: Move ELF parsing into scripts/elf-parse.[ch] 2025-10-24 16:43:14 -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
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 arch: hookup listns() system call 2025-11-03 17:41:18 +01:00
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
tools-support-relr.sh
tracepoint-update.c tracing: Fix unused tracepoints when module uses only exported ones 2025-12-09 21:16:07 -05:00
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