Re: [PATCH v2] arm64/module: use mod->klp_info section header information for livepatch modules

[Jessica Yu]

+++ Miroslav Benes [29/10/18 14:24 +0100]:
> > diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
> > index dd23655fda3a..490e56070a7e 100644
> > --- a/arch/arm64/kernel/module.c
> > +++ b/arch/arm64/kernel/module.c
> > @@ -461,5 +461,15 @@ int module_finalize(const Elf_Ehdr *hdr,
> > #endif
> > 	}
> >
> > +#ifdef CONFIG_LIVEPATCH
> > +	/*
> > +	 * For livepatching, switch to the saved section header info for .plt
> > +	 * stored in mod->klp_info. This is needed so that livepatch is able to
> > +	 * call apply_relocate_add() after patch module load.
> > +	 */
> > +	if (is_livepatch_module(me))
> > +		me->arch.core.plt = me->klp_info->sechdrs + me->arch.core.plt_shndx;
> > +#endif
>
> I missed it before, but the hunk should be under "#ifdef
> CONFIG_ARM64_MODULE_PLTS" protection similarly to ftrace_trampoline just
> above. me->arch.core.plt may not exist otherwise.

Gah! Yes you are right, will fix.

Thanks,

Jessica