[PATCH v2] elf: Set this_idx to -1 for invalid relocations

[H.J. Lu]

On Mon, Aug 3, 2026 at 7:43 AM Alan Modra <amodra@gmail.com> wrote:
>
> On Sun, Aug 02, 2026 at 08:55:00AM +0800, H.J. Lu wrote:
> > On Sun, Aug 2, 2026 at 6:18 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> > >
> > > When invalid relocation is reported by elf_link_read_relocs_from_section
> > > called from lang_gc_sections:
> > >
> > > ld: pr34448-bug_18.o: bad reloc symbol index (0xf2000005 >= 0x13) for
> > > offset 0x4 in section `.text.get_tls[get_tls]'
> > >
> > > the same error is reported again:
> > >
> > > ld: pr34448-bug_18.o: bad reloc symbol index (0xf2000005 >= 0x13) for
> > > offset 0x4 in section `.text.get_tls[get_tls]'
>
> Using this_idx as a flag is a bad idea.
>
> I also think that no one should be too concerned about error messages
> from fuzzed object files, so if you are going to fix this minor
> problem do so in a way that won't potentially break the linker.
>

Then should linker stop when seeing a fuzzed object file, instead of keep
going and crash later?


-- 
H.J.