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[109.81.1.107]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bd5ee243sm50097772f8f.31.2026.01.14.04.31.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jan 2026 04:31:49 -0800 (PST) From: Petr Pavlu To: Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence Cc: Luis Chamberlain , Petr Pavlu , Daniel Gomez , Sami Tolvanen , Aaron Tomlin , Peter Zijlstra , live-patching@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] livepatch: Free klp_{object,func}_ext data after initialization Date: Wed, 14 Jan 2026 13:29:54 +0100 Message-ID: <20260114123056.2045816-3-petr.pavlu@suse.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260114123056.2045816-1-petr.pavlu@suse.com> References: <20260114123056.2045816-1-petr.pavlu@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The klp_object_ext and klp_func_ext data, which are stored in the __klp_objects and __klp_funcs sections, respectively, are not needed after they are used to create the actual klp_object and klp_func instances. This operation is implemented by the init function in scripts/livepatch/init.c. Prefix the two sections with ".init" so they are freed after the module is initializated. Signed-off-by: Petr Pavlu Acked-by: Joe Lawrence --- kernel/livepatch/core.c | 3 ++- scripts/module.lds.S | 4 ++-- tools/objtool/check.c | 2 +- tools/objtool/include/objtool/klp.h | 10 +++++----- tools/objtool/klp-diff.c | 2 +- 5 files changed, 11 insertions(+), 10 deletions(-) diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index 4e0ac47b3623..3621a7c1b737 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -1364,7 +1364,8 @@ struct klp_object_ext *klp_build_locate_init_objects(= const struct module *mod, for (int i =3D 1; i < info->hdr.e_shnum; i++) { Elf_Shdr *shdr =3D &info->sechdrs[i]; =20 - if (strcmp(info->secstrings + shdr->sh_name, "__klp_objects")) + if (strcmp(info->secstrings + shdr->sh_name, + ".init.klp_objects")) continue; =20 *nr_objs =3D shdr->sh_size / sizeof(struct klp_object_ext); diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 383d19beffb4..054ef99e8288 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -34,8 +34,8 @@ SECTIONS { =20 __patchable_function_entries : { *(__patchable_function_entries) } =20 - __klp_funcs 0: ALIGN(8) { KEEP(*(__klp_funcs)) } - __klp_objects 0: ALIGN(8) { KEEP(*(__klp_objects)) } + .init.klp_funcs 0 : ALIGN(8) { KEEP(*(.init.klp_funcs)) } + .init.klp_objects 0 : ALIGN(8) { KEEP(*(.init.klp_objects)) } =20 #ifdef CONFIG_ARCH_USES_CFI_TRAPS __kcfi_traps : { KEEP(*(.kcfi_traps)) } diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 3f7999317f4d..933868ee3beb 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -4761,7 +4761,7 @@ static int validate_ibt(struct objtool_file *file) !strcmp(sec->name, "__bug_table") || !strcmp(sec->name, "__ex_table") || !strcmp(sec->name, "__jump_table") || - !strcmp(sec->name, "__klp_funcs") || + !strcmp(sec->name, ".init.klp_funcs") || !strcmp(sec->name, "__mcount_loc") || !strcmp(sec->name, ".llvm.call-graph-profile") || !strcmp(sec->name, ".llvm_bb_addr_map") || diff --git a/tools/objtool/include/objtool/klp.h b/tools/objtool/include/ob= jtool/klp.h index ad830a7ce55b..e32e5e8bc631 100644 --- a/tools/objtool/include/objtool/klp.h +++ b/tools/objtool/include/objtool/klp.h @@ -6,12 +6,12 @@ #define SHN_LIVEPATCH 0xff20 =20 /* - * __klp_objects and __klp_funcs are created by klp diff and used by the p= atch - * module init code to build the klp_patch, klp_object and klp_func structs - * needed by the livepatch API. + * .init.klp_objects and .init.klp_funcs are created by klp diff and used = by the + * patch module init code to build the klp_patch, klp_object and klp_func + * structs needed by the livepatch API. */ -#define KLP_OBJECTS_SEC "__klp_objects" -#define KLP_FUNCS_SEC "__klp_funcs" +#define KLP_OBJECTS_SEC ".init.klp_objects" +#define KLP_FUNCS_SEC ".init.klp_funcs" =20 /* * __klp_relocs is an intermediate section which are created by klp diff a= nd diff --git a/tools/objtool/klp-diff.c b/tools/objtool/klp-diff.c index 4d1f9e9977eb..fd64d5e3c3b6 100644 --- a/tools/objtool/klp-diff.c +++ b/tools/objtool/klp-diff.c @@ -1439,7 +1439,7 @@ static int clone_special_sections(struct elfs *e) } =20 /* - * Create __klp_objects and __klp_funcs sections which are intermediate + * Create .init.klp_objects and .init.klp_funcs sections which are interme= diate * sections provided as input to the patch module's init code for building= the * klp_patch, klp_object and klp_func structs for the livepatch API. */ --=20 2.52.0