Re: [PATCH] fix modpost segfault for 64bit mipsel kernel

[Thiemo Seufer <ths@networkno.de>]

Thiemo Seufer wrote:
> Atsushi Nemoto wrote:
> > 64bit mips has different r_info layout.  This patch fixes modpost
> > segfault for 64bit little endian mips kernel.
> > 
> > Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
> > 
> > diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> > index cd00e9f..7846600 100644
> > --- a/scripts/mod/modpost.c
> > +++ b/scripts/mod/modpost.c
> > @@ -712,7 +712,13 @@ static void check_sec_ref(struct module 
> >  			r.r_offset = TO_NATIVE(rela->r_offset);
> >  			r.r_info   = TO_NATIVE(rela->r_info);
> >  			r.r_addend = TO_NATIVE(rela->r_addend);
> > +#if KERNEL_ELFCLASS == ELFCLASS64 && KERNEL_ELFDATA == ELFDATA2LSB
> > +			sym = elf->symtab_start +
> > +				(hdr->e_machine == EM_MIPS ?
> > +				 (Elf32_Word)r.r_info : ELF_R_SYM(r.r_info));
> > +#else
> >  			sym = elf->symtab_start + ELF_R_SYM(r.r_info);
> > +#endif
> 
> This doesn't look right. ELF64_R_SYM/ELF64_R_TYPE should be fixed for
> mips64 instead.

I should have read more carefully. The ELF_R_SYM seems to be correct, if
this patch makes it work fo you then the toolchain you use creates broken
(word-swapped ?) relocation entries for mips64el.


Thiemo