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create-diff-object: use toc_rela() in kpatch_line_macro_change_only() 

For ppc64le, if a rela goes through the .toc, it requires an extra level
of indirection.  Use toc_rela() here to ensure it gets the rela we care
about.  This will be needed for the upcoming patch which checks for
`__func__`.

For non-ppc64le arches, and for ppc64le relas which don't go through the
.toc, toc_rela() is a no-op which just returns the rela.  So this is
harmless for non-.toc cases.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Josh Poimboeuf 2022-04-01 15:38:53 -07:00
parent 81296117f4
commit af672577b3
1 changed files with 8 additions and 4 deletions
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12
kpatch-build/create-diff-object.c
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@ -672,7 +672,7 @@ static bool kpatch_line_macro_change_only(struct kpatch_elf *kelf,
{
unsigned long offset, insn1_len, insn2_len;
void *data1, *data2, *insn1, *insn2;
struct rela *rela;
struct rela *r, *rela;
bool found, found_any = false;
if (sec->status != CHANGED ||
@ -720,12 +720,16 @@ static bool kpatch_line_macro_change_only(struct kpatch_elf *kelf,
return false;
found = false;
list_for_each_entry(rela, &sec->rela->relas, list) {
list_for_each_entry(r, &sec->rela->relas, list) {
if (rela->offset < offset + insn1_len)
if (r->offset < offset + insn1_len)
continue;
if (toc_rela(rela) && toc_rela(rela)->string)
rela = toc_rela(r);
if (!rela)
continue;
if (rela->string)
continue;
if (!strncmp(rela->sym->name, "__warned.", 9) ||