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create-diff-object: Fix out-of-range relocation check 

Improve the relocation check for the case where the referenced symbol
isn't at the beginning of the section.

Note that the check still isn't perfect, as many relocations have a
negative addend.  But it's still a lot better than nothing.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Josh Poimboeuf 2021-04-13 14:00:41 -05:00
parent fa5a95cafd
commit 81f9ca4833
1 changed files with 1 additions and 1 deletions
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kpatch-build/create-diff-object.c
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@ -2546,7 +2546,7 @@ static void kpatch_check_relocations(struct kpatch_elf *kelf)
list_for_each_entry(rela, &sec->relas, list) {
if (rela->sym->sec) {
sdata = rela->sym->sec->data;
if (rela->addend > (long)sdata->d_size) {
if ((long)rela->sym->sym.st_value + rela->addend > (long)sdata->d_size) {
ERROR("out-of-range relocation %s+%lx in %s", rela->sym->name,
rela->addend, sec->name);
}