Josh Poimboeuf 07f14d6af9 objtool/klp: Fix cross-module klp relocation section naming ...

A klp relocation section is .klp.rela.<objname>.<secname>, where objname
is the object being patched.

klp-build wrongly derives objname from where the referenced symbol
lives, not where it's referenced.  For a cross-module reference like
patched can_isotp code calling can.ko's can_rx_unregister(), that gives
.klp.rela.can..text rather than .klp.rela.can_isotp..text.  Unless the
patch happens to patch can.ko as well, the relocation never gets applied
and the call goes off into the weeds.

Name the intermediate section __klp_relocs.<objname> so post-link can
read the patched object's name from there.

Fixes: dd590d4d57 ("objtool/klp: Introduce klp diff subcommand for diffing object files")
Reported-by: Joe Lawrence <joe.lawrence@redhat.com>
Link: https://lore.kernel.org/20260720145658.1103243-2-joe.lawrence@redhat.com
Acked-by: Song Liu <song@kernel.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Link: https://patch.msgid.link/ee93a08f3e55e76ffa67d04e283917ddaa893f09.1786138493.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

2026-08-11 16:10:51 -07:00

..

objtool

objtool/klp: Fix cross-module klp relocation section naming

2026-08-11 16:10:51 -07:00