linux-kernel - Re: [PATCH 1/2] tools/stacktool: Add __reiserfs_panic to global

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Message-ID: <20160125150445.GB19233@treble.redhat.com>
Date:	Mon, 25 Jan 2016 09:04:45 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Chris J Arges <chris.j.arges@...onical.com>
Cc:	live-patching@...r.kernel.org, x86@...nel.org, pbonzini@...hat.com,
	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tools/stacktool: Add __reiserfs_panic to
 global_noreturns list

On Fri, Jan 22, 2016 at 03:44:37PM -0600, Chris J Arges wrote:
> The following false positives were noticed with stacktool:
>   stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x9e: return without frame pointer restore
>   stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x89: duplicate frame pointer save
>   stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x8a: duplicate frame pointer setup
>   stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x9e: frame pointer state mismatch
>   stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x0: frame pointer state mismatch
> 
> These all call into '__reiserfs_panic' which has a noreturn attribute. Add this
> to the global list because this particular attribute cannot be determined from
> reading the ELF object.
> 
> Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

> ---
>  tools/stacktool/builtin-check.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/stacktool/builtin-check.c b/tools/stacktool/builtin-check.c
> index 5b0e91f..23fa93d2 100644
> --- a/tools/stacktool/builtin-check.c
> +++ b/tools/stacktool/builtin-check.c
> @@ -139,6 +139,7 @@ static bool dead_end_function(struct stacktool_file *file, struct symbol *func)
>  		"__module_put_and_exit",
>  		"complete_and_exit",
>  		"kvm_spurious_fault",
> +		"__reiserfs_panic",
>  	};
>  
>  	if (func->bind == STB_WEAK)
> -- 
> 2.5.0
> 

-- 
Josh