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kpatch-elf: add kpatch_remove_and_free_section()

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Add kpatch_remove_and_free_section(), which, given a section name,
removes and frees all matching sections from the passed in kpatch_elf.
This commit is contained in:
Jessica Yu 2017-01-23 12:43:05 -08:00
parent dac26b8cb2
commit 52e2ad66ca
2 changed files with 35 additions and 0 deletions
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34
kpatch-build/kpatch-elf.c
View File

@ -671,6 +671,40 @@ struct section *create_section_pair(struct kpatch_elf *kelf, char *name,
return sec;
}
void kpatch_remove_and_free_section(struct kpatch_elf *kelf, char *secname)
{
struct section *sec, *safesec;
struct rela *rela, *saferela;
list_for_each_entry_safe(sec, safesec, &kelf->sections, list) {
if (strcmp(secname, sec->name))
continue;
if (is_rela_section(sec)) {
list_for_each_entry_safe(rela, saferela, &sec->relas, list) {
list_del(&rela->list);
memset(rela, 0, sizeof(*rela));
free(rela);
}
}
/*
* Remove the STT_SECTION symbol from the symtab,
* otherwise when we remove the section we'll end up
* with UNDEF section symbols in the symtab.
*/
if (!is_rela_section(sec) && sec->secsym) {
list_del(&sec->secsym->list);
memset(sec->secsym, 0, sizeof(*sec->secsym));
free(sec->secsym);
}
list_del(&sec->list);
memset(sec, 0, sizeof(*sec));
free(sec);
}
}
void kpatch_reindex_elements(struct kpatch_elf *kelf)
{
struct section *sec;

1
kpatch-build/kpatch-elf.h
View File

@ -150,6 +150,7 @@ void kpatch_create_strtab(struct kpatch_elf *kelf);
void kpatch_create_symtab(struct kpatch_elf *kelf);
struct section *create_section_pair(struct kpatch_elf *kelf, char *name,
int entsize, int nr);
void kpatch_remove_and_free_section(struct kpatch_elf *kelf, char *secname);
void kpatch_reindex_elements(struct kpatch_elf *kelf);
void kpatch_rebuild_rela_section_data(struct section *sec);
void kpatch_write_output_elf(struct kpatch_elf *kelf, Elf *elf, char *outfile);