linux-kernel - Re: [PATCH] objtool: Add fortify_panic as _

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Date:   Thu, 15 Jun 2017 08:14:31 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Daniel Micay <danielmicay@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] objtool: Add fortify_panic as __noreturn function

On Wed, Jun 14, 2017 at 07:18:51PM -0700, Kees Cook wrote:
> CONFIG_FORTIFY_SOURCE implements fortify_panic() as a __noreturn function,
> so objtool needs to know about it too.
> 
> Suggested-by: Daniel Micay <danielmicay@...il.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  tools/objtool/builtin-check.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
> index 282a60368b14..5f66697fe1e0 100644
> --- a/tools/objtool/builtin-check.c
> +++ b/tools/objtool/builtin-check.c
> @@ -192,7 +192,8 @@ static int __dead_end_function(struct objtool_file *file, struct symbol *func,
>  		"complete_and_exit",
>  		"kvm_spurious_fault",
>  		"__reiserfs_panic",
> -		"lbug_with_loc"
> +		"lbug_with_loc",
> +		"fortify_panic",
>  	};
>  
>  	if (func->bind == STB_WEAK)

Thanks, I'll take the patch.

Eventually I'd like to experiment with a GCC plugin to automatically
detect these noreturn cases instead of the hard-coded list.

-- 
Josh