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From c1a07a5329c0b7db0ec54eea093e5d2d77735c06 Mon Sep 17 00:00:00 2001
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From: Joe Lawrence <joe.lawrence@redhat.com>
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Date: Fri, 9 Dec 2022 15:37:49 -0500
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Subject: [PATCH] v0.9.2 backport: MR!1200 ("Make sure section symbols exist")
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Content-type: text/plain
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commit 5622e3cc3d393fd77866b9838d16cd064de6fba5
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Author: Artem Savkov <asavkov@redhat.com>
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Date: Fri Jun 18 10:59:26 2021 +0200
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Make sure section symbols exist
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Binutils recently became much more aggressive about removing unused
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section symbols. Since we can not rely on those being available anymore
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add additional checks before using them.
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Fixes: #1193
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Signed-off-by: Artem Savkov <asavkov@redhat.com>
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Fixes: KLP-216 ("Backport kpatch-build section symbol check")
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Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
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---
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kpatch-build/create-diff-object.c | 15 ++++++++++-----
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1 file changed, 10 insertions(+), 5 deletions(-)
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diff --git a/kpatch-build/create-diff-object.c b/kpatch-build/create-diff-object.c
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index c9afe33bbdae..94879b5fce6a 100644
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--- a/kpatch-build/create-diff-object.c
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+++ b/kpatch-build/create-diff-object.c
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@@ -1241,7 +1241,8 @@ static void kpatch_correlate_static_local_variables(struct kpatch_elf *base,
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if (bundled && sym->sec->twin) {
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UNCORRELATE_ELEMENT(sym->sec);
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- UNCORRELATE_ELEMENT(sym->sec->secsym);
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+ if (sym->sec->secsym)
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+ UNCORRELATE_ELEMENT(sym->sec->secsym);
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if (sym->sec->rela)
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UNCORRELATE_ELEMENT(sym->sec->rela);
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@@ -1744,7 +1745,7 @@ static int kpatch_include_callback_elements(struct kpatch_elf *kelf)
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sym = rela->sym;
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log_normal("found callback: %s\n",sym->name);
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kpatch_include_symbol(sym);
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- } else {
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+ } else if (sec->secsym) {
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sec->secsym->include = 1;
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}
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}
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@@ -1772,7 +1773,8 @@ static void kpatch_include_force_elements(struct kpatch_elf *kelf)
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sec->include = 1;
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if (!is_rela_section(sec)) {
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/* .kpatch.force */
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- sec->secsym->include = 1;
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+ if (sec->secsym)
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+ sec->secsym->include = 1;
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continue;
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}
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/* .rela.kpatch.force */
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@@ -2381,7 +2383,8 @@ static void kpatch_regenerate_special_section(struct kpatch_elf *kelf,
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sec->include = 1;
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sec->base->include = 1;
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/* include secsym so .kpatch.arch relas can point to section symbols */
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- sec->base->secsym->include = 1;
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+ if (sec->base->secsym)
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+ sec->base->secsym->include = 1;
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/*
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* Update text section data buf and size.
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@@ -2564,7 +2567,9 @@ static void kpatch_mark_ignored_sections(struct kpatch_elf *kelf)
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* from the section data comparison, but this is a simpler way.
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*/
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strsec->include = 1;
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- strsec->secsym->include = 1;
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+ if (strsec->secsym)
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+ strsec->secsym->include = 1;
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+
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name = strsec->data->d_buf + rela->addend;
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ignoresec = find_section_by_name(&kelf->sections, name);
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if (!ignoresec)
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--
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2.38.1
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