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Make sure section symbols exist

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Binutils recently became much more aggressive about removing unused
section symbols. Since we can not rely on those being available anymore
add additional checks before using them.

Fixes: #1193

Signed-off-by: Artem Savkov <asavkov@redhat.com>
This commit is contained in:
Artem Savkov 2021-06-18 10:59:26 +02:00
parent 59aabd154e
commit 5622e3cc3d
1 changed files with 10 additions and 5 deletions
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15
kpatch-build/create-diff-object.c
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@ -1282,7 +1282,8 @@ static void kpatch_correlate_static_local_variables(struct kpatch_elf *base,
if (bundled && sym->sec->twin) {
UNCORRELATE_ELEMENT(sym->sec);
UNCORRELATE_ELEMENT(sym->sec->secsym);
if (sym->sec->secsym)
UNCORRELATE_ELEMENT(sym->sec->secsym);
if (sym->sec->rela)
UNCORRELATE_ELEMENT(sym->sec->rela);
@ -1785,7 +1786,7 @@ static int kpatch_include_callback_elements(struct kpatch_elf *kelf)
sym = rela->sym;
log_normal("found callback: %s\n",sym->name);
kpatch_include_symbol(sym);
} else {
} else if (sec->secsym) {
sec->secsym->include = 1;
}
}
@ -1813,7 +1814,8 @@ static void kpatch_include_force_elements(struct kpatch_elf *kelf)
sec->include = 1;
if (!is_rela_section(sec)) {
/* .kpatch.force */
sec->secsym->include = 1;
if (sec->secsym)
sec->secsym->include = 1;
continue;
}
/* .rela.kpatch.force */
@ -2431,7 +2433,8 @@ static void kpatch_regenerate_special_section(struct kpatch_elf *kelf,
sec->include = 1;
sec->base->include = 1;
/* include secsym so .kpatch.arch relas can point to section symbols */
sec->base->secsym->include = 1;
if (sec->base->secsym)
sec->base->secsym->include = 1;
/*
* Update text section data buf and size.
@ -2614,7 +2617,9 @@ static void kpatch_mark_ignored_sections(struct kpatch_elf *kelf)
* from the section data comparison, but this is a simpler way.
*/
strsec->include = 1;
strsec->secsym->include = 1;
if (strsec->secsym)
strsec->secsym->include = 1;
name = strsec->data->d_buf + rela->addend;
ignoresec = find_section_by_name(&kelf->sections, name);
if (!ignoresec)