linux-kernel - Re: [PATCH 1/5] MIPS: Bail on unsupported module relocs

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Date:	Wed, 3 Feb 2016 12:24:38 +0000
From:	"Maciej W. Rozycki" <macro@...tec.com>
To:	Paul Burton <paul.burton@...tec.com>
CC:	<linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>,
	James Hogan <james.hogan@...tec.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	"Steven J. Hill" <Steven.Hill@...tec.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	<linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH 1/5] MIPS: Bail on unsupported module relocs

On Wed, 3 Feb 2016, Paul Burton wrote:

> --- a/arch/mips/kernel/module-rela.c
> +++ b/arch/mips/kernel/module-rela.c
> @@ -134,9 +135,21 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
>  			return -ENOENT;
>  		}
>  
> -		v = sym->st_value + rel[i].r_addend;
> +		type = ELF_MIPS_R_TYPE(rel[i]);
> +
> +		if (type < ARRAY_SIZE(reloc_handlers_rela))
> +			handler = reloc_handlers_rela[type];
> +		else
> +			handler = NULL;
>  
> -		res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
> +		if (!handler) {
> +			pr_warn("%s: Unknown relocation type %u\n",
> +				me->name, type);
> +			return -EINVAL;

 Hmm, this looks like a fatal error condition to me, the module won't 
load.  Why `pr_warn' rather than `pr_err' then?  Likewise in the other 
file.

  Maciej