Josh Poimboeuf d8a2860b4a objtool/klp: Fix vmlinux klp relocations for EXPORT_SYMBOL_FOR_MODULES() ... When a module function references a vmlinux symbol which is exported with EXPORT_SYMBOL_FOR_MODULES(), a patch to that function needs to use a klp reloc. Currently, livepatch fails to load such a module: livepatch: invalid access to vmlinux symbol 'get_task_policy' from module-specific livepatch relocation section livepatch: failed to initialize patch 'livepatch_test' for module 'testmod' (-22) livepatch: patch 'livepatch_test' failed for module 'testmod', refusing to load module 'testmod' klp diff puts all klp relocs in __klp_relocs.<patched object>, so post-link names the section .klp.rela.<patched object>.<secname>, which the kernel rejects for vmlinux symbols. Commit 07f14d6af9 ("objtool/klp: Fix cross-module klp relocation section naming") changed the meaning of objname in the klp rela section name to be where the referenced symbol is referenced rather than where it lives. That premise only holds for symbols in a module: the relocs get applied when the patched module gets patched, and the module dependency guarantees the referenced module is loaded by then. A vmlinux symbol needs the opposite. It's always resolvable, and it has to be applied when the patch module loads, before the module loader initializes the patch module's special sections, which may reference it. That's why livepatch rejects vmlinux symbols in module-specific sections. Use "vmlinux" as the section objname when the referenced symbol lives in vmlinux. This moves such klp relocs from .klp.rela.kvm..text to .klp.rela.vmlinux..text. Fixes: 07f14d6af9 ("objtool/klp: Fix cross-module klp relocation section naming") Reported-by: Dylan Hatch <dylanbhatch@google.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Song Liu <song@kernel.org> Link: https://patch.msgid.link/f8e3b9fae109903a6aafb2a33310e4afdcebf58e.1786761327.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/CADBMgpz7iWC0=t=_gE-tfvv0mTPq4kg0qQ2zgPH8DVPE6eQ9Kw@mail.gmail.com		2026-08-17 10:53:55 +02:00
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arch.h	objtool/klp: Fix position-dependent checksums for non-relocated jumps/calls	2026-05-04 21:16:06 -07:00
builtin.h	objtool/klp: Add .klp.symid for sympos disambiguation	2026-08-03 07:12:39 +02:00
cfi.h	objtool: Allow stack operations in UNWIND_HINT_UNDEFINED regions	2023-06-07 10:03:11 -07:00
check.h	objtool/klp: Fix position-dependent checksums for non-relocated jumps/calls	2026-05-04 21:16:06 -07:00
checksum_types.h	objtool/klp: Add --checksum option to generate per-function checksums	2025-10-14 14:50:17 -07:00
checksum.h	objtool/klp: Calculate object checksums	2026-05-04 21:16:06 -07:00
disas.h	objtool: Add the --disas=<function-pattern> action	2025-11-21 15:30:12 +01:00
elf.h	objtool/klp: Fix .kcfi_traps special section extraction	2026-08-12 13:52:07 -07:00
endianness.h	objtool: Add annotype() helper	2025-10-14 14:46:49 -07:00
klp.h	objtool/klp: Fix vmlinux klp relocations for EXPORT_SYMBOL_FOR_MODULES()	2026-08-17 10:53:55 +02:00
objtool.h	objtool: Add more robust signal error handling, detect and warn about stack overflows	2025-12-03 19:42:37 +01:00
orc.h	objtool/x86: Separate arch-specific and generic parts	2024-03-11 22:23:47 +08:00
special.h	objtool/klp: Ignore replacement offset of empty x86 alternatives	2026-08-11 15:04:57 -07:00
trace.h	objtool: Improve tracing of alternative instructions	2025-11-21 15:30:11 +01:00
util.h	objtool/klp: Introduce klp diff subcommand for diffing object files	2025-10-14 14:50:18 -07:00
warn.h	objtool: Add insn_sym() helper	2026-05-04 21:16:06 -07:00