linux-kernel - Re: [RFC PATCH v2 4/6] livepatch: reuse module loader code to write relocations

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Date:	Thu, 10 Dec 2015 22:20:32 +0800
From:	Minfei Huang <mnfhuang@...il.com>
To:	Jessica Yu <jeyu@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Miroslav Benes <mbenes@...e.cz>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH v2 4/6] livepatch: reuse module loader code to write
 relocations

On 11/30/15 at 11:21P, Jessica Yu wrote:
> +	klp_for_each_reloc_sec(obj, reloc_sec) {
> +		relindex = reloc_sec->index;
> +		num_relas = pmod->sechdrs[relindex].sh_size / sizeof(Elf_Rela);
> +		rela = (Elf_Rela *) pmod->sechdrs[relindex].sh_addr;
> +
> +		/* For each rela in this __klp_rela section */
> +		for (i = 0; i < num_relas; i++, rela++) {
> +			sym = symtab + ELF_R_SYM(rela->r_info);
> +			symname = pmod->core_strtab + sym->st_name;
> +
> +			if (sym->st_shndx == SHN_LIVEPATCH) {
> +				if (sym->st_info == 'K')
> +					ret = klp_find_external_symbol(pmod, symname, &addr);
> +				else
> +					ret = klp_find_object_symbol(obj->name, symname, &addr);
> +				if (ret)
> +					return ret;
> +				sym->st_value = addr;
> +			}
>  		}
> +		ret = apply_relocate_add(pmod->sechdrs, pmod->core_strtab,
> +					 pmod->index.sym, relindex, pmod);

It is more appropiate to test the ret.

Thanks
Minfei

>  	}
>  
> -	return 0;
> +	return ret;
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