Changes in klp-sympos.c

a0acd94e3819fcd8346ae3c16df987e0fabb3128 - Merge tag 'objtool-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 18 Aug 2026 21:18:33 +0200

Merge tag 'objtool-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull objtool updates from Ingo Molnar: - Fix various klp-build bugs reported by Joe Lawrence (Josh Poimboeuf, Joe Lawrence) - Misc fixes and cleanups (Puranjay Mohan, Thomas Huth and Ingo Molnar)* tag 'objtool-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool/klp: Fix vmlinux klp relocations for EXPORT_SYMBOL_FOR_MODULES() objtool/klp: Fix .kcfi_traps special section extraction objtool/klp: Fix vmlinux .klp.symid link error for .exitcall.exit symbols objtool/klp: Fix line numbers in Module.symvers parse errors objtool/klp: Fix relocations for EXPORT_SYMBOL_FOR_MODULES() symbols objtool/klp: Allow new references to module exports objtool/klp: Don't match local symbols against exports objtool/klp: Fix cross-module klp relocation section naming objtool/klp: Explicitly disallow patching or referencing init code/data objtool/klp: Ignore replacement offset of empty x86 alternatives objtool/klp: Fix size of empty special section entries objtool/klp: Fix vmlinux .klp.symid link error for .no_trim_symbol symbols objtool/headers: Sync tools/include/linux/objtool_types.h with include/linux/objtool_types.h objtool: Replace __ASSEMBLY__ with __ASSEMBLER__ in header files objtool/klp: Fix symbol resolution for duplicate data symbols objtool/klp: Add .klp.symid for sympos disambiguation objtool/klp: Skip hidden directories when finding objects objtool/klp: Fix false module dependencies caused by dead relocs objtool/klp: Normalize Module.symvers paths to module names objtool/klp: Fix module name normalization for paths with dots List of files: /linux/tools/objtool/klp-sympos.c

69f361b8a7a2f65c1bb236ea0899cdaad7267653 - objtool/klp: Explicitly disallow patching or referencing init code/data

Fri, 07 Aug 2026 23:37:49 +0200

objtool/klp: Explicitly disallow patching or referencing init code/dataExplicitly disallow the patching and referencing of init code/data.Otherwise it could potentially introduce some odd edge cases dependingon whether the target object's init section has been freed yet (notethat the init code still exists in the target module when doing latemodule patching).Such edge cases include sympos calculation and the patching and/orreferencing of non-existent (init-freed) code/data. Not to mention theinherent differences in behavior that occur when the init code is onlypatched *some* of the time depending on module loading order or kernelconfig.Acked-by: Joe Lawrence Acked-by: Song Liu Link: https://patch.msgid.link/516e14f84cfbffa27dc19d3dcf35097504097966.1786138493.git.jpoimboe@kernel.orgSigned-off-by: Josh Poimboeuf List of files: /linux/tools/objtool/klp-sympos.c

15fa203ef91e8a303c322eaaa8ca01a6ddaf94dc - objtool/klp: Fix symbol resolution for duplicate data symbols

Mon, 03 Aug 2026 05:24:28 +0200

objtool/klp: Fix symbol resolution for duplicate data symbolsfind_sympos() calculates a sympos used by livepatch to disambiguateduplicately-named symbols. For function symbols, there's a hack whichcounts .text.unlikely symbols before other .text symbols, matching thelinker script's section ordering.Not only is the hack fragile, data symbols can have the same problem.So for example, adding a reference to pwq_cache inep_unregister_pollwait() can trigger a corrupt sympos and a relocationto the wrong pwq_cache symbol in the livepatch module, resulting in acrash or undefined behavior.Remove the existing hack in favor of a fully deterministic solution,using the new .klp.symid table to derive the symbol-to-id mapping fromthe original vmlinux.o and the id-to-address mapping from thecorresponding vmlinux, which can then be used to determine the exactsympos associated with the original vmlinux.Modules don't need any special treatment: the .ko has the samesection/symbol ordering as the original whole-archive symbol table.Fixes: dd590d4d57eb ("objtool/klp: Introduce klp diff subcommand for diffing object files")Reported-by: Ben Procknow Reported-by: Joe Lawrence Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: live-patching@vger.kernel.orgLink: https://lore.kernel.org/20260710153042.3156788-1-joe.lawrence@redhat.comLink: https://lore.kernel.org/20260724221730.3126529-1-joe.lawrence@redhat.comLink: https://patch.msgid.link/919785e3bf2245db02ff6391e735d9cb139170b1.1785727106.git.jpoimboe@kernel.org List of files: /linux/tools/objtool/klp-sympos.c