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create-diff-object: check for out-of-range relocations

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Check that none of the relocations are out-of-range of their
corresponding sections before writing the output elf.

Fixes: #618

Signed-off-by: Artem Savkov <asavkov@redhat.com>
This commit is contained in:
Artem Savkov 2018-04-10 16:24:06 +02:00
parent e73d98ec0f
commit 1d9f75a155
1 changed files with 22 additions and 0 deletions
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22
kpatch-build/create-diff-object.c
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@ -1923,6 +1923,27 @@ static void kpatch_regenerate_special_section(struct kpatch_elf *kelf,
sec->base->data->d_size = dest_offset;
}
static void kpatch_check_relocations(struct kpatch_elf *kelf)
{
struct rela *rela;
struct section *sec;
Elf_Data *sdata;
list_for_each_entry(sec, &kelf->sections, list) {
if (!is_rela_section(sec))
continue;
list_for_each_entry(rela, &sec->relas, list) {
if (rela->sym->sec) {
sdata = rela->sym->sec->data;
if (rela->addend > sdata->d_size) {
ERROR("out-of-range relocation %s+%x in %s", rela->sym->sec->name,
rela->addend, sec->name);
}
}
}
}
}
static void kpatch_include_debug_sections(struct kpatch_elf *kelf)
{
struct section *sec;
@ -3082,6 +3103,7 @@ int main(int argc, char *argv[])
sec->sh.sh_info = sec->base->index;
kpatch_rebuild_rela_section_data(sec);
}
kpatch_check_relocations(kelf_out);
kpatch_create_shstrtab(kelf_out);
kpatch_create_strtab(kelf_out);