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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
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2
scripts/livepatch/init.c
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@ -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)) }