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livepatch: Free klp_{object,func}_ext data after initialization

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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 <petr.pavlu@suse.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Aaron Tomlin <atomlin@atomlin.com>
Link: https://patch.msgid.link/20260123102825.3521961-3-petr.pavlu@suse.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Petr Pavlu
2026-01-23 11:26:57 +01:00
committed by Josh Poimboeuf
parent ab10815472
commit b525fcaf0a
5 changed files with 10 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
scripts/livepatch/init.c
View File

@@ -19,7 +19,7 @@ static int __init livepatch_mod_init(void)
unsigned int nr_objs;
int ret;
obj_exts = klp_find_section_by_name(THIS_MODULE, "__klp_objects",
obj_exts = klp_find_section_by_name(THIS_MODULE, ".init.klp_objects",
&obj_exts_sec_size);
nr_objs = obj_exts_sec_size / sizeof(*obj_exts);
if (!nr_objs) {

4
scripts/module.lds.S
View File

@@ -34,8 +34,8 @@ SECTIONS {
__patchable_function_entries : { *(__patchable_function_entries) }
__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)) }
#ifdef CONFIG_ARCH_USES_CFI_TRAPS
__kcfi_traps : { KEEP(*(.kcfi_traps)) }

2
tools/objtool/check.c
View File

@@ -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") ||

10
tools/objtool/include/objtool/klp.h
View File

@@ -6,12 +6,12 @@
#define SHN_LIVEPATCH 0xff20
/*
* __klp_objects and __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.
* .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"
/*
* __klp_relocs is an intermediate section which are created by klp diff and

2
tools/objtool/klp-diff.c
View File

@@ -1436,7 +1436,7 @@ static int clone_special_sections(struct elfs *e)
}
/*
* Create __klp_objects and __klp_funcs sections which are intermediate
* Create .init.klp_objects and .init.klp_funcs sections which are intermediate
* 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.
*/