linux-kernel - Re: [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 16 Aug 2015 13:28:58 +0800
From:	joeyli <jlee@...e.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data

On Sat, Aug 15, 2015 at 07:07:38PM +0200, Pavel Machek wrote:
> On Tue 2015-08-11 14:16:28, Lee, Chun-Yi wrote:
> > For forwarding hibernation key from EFI stub to boot kernel, this patch
> > allocates setup data for carrying hibernation key, size and the status
> > of efi operating.
> > 
> > Reviewed-by: Jiri Kosina <jkosina@...e.com>
> 
> Jiri, are you sure you reviewed these? This is not really
> english, afaict, and efi/EFI should be spelled consistently.
> 
> Could you try reviewing it again? Pointing out 10s of small
> bugs is quite boring...
>

It's my fault, I will find someone help to review my English in all
patch description for next edition.
 
> >  	unsigned long key_size;
> >  	unsigned long attributes;
> > +	struct setup_data *setup_data, *hibernation_setup_data;
> >  	struct hibernation_keys *keys;
> > +	unsigned long size = 0;
> >  	efi_status_t status;
> >  
> >  	/* Allocate setup_data to carry keys */
> > +	size = sizeof(struct setup_data) + sizeof(struct hibernation_keys);
> >  	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
> > -				sizeof(struct hibernation_keys), &keys);
> > +				size, &hibernation_setup_data);
> >  	if (status != EFI_SUCCESS) {
> >  		efi_printk(sys_table, "Failed to alloc mem for hibernation keys\n");
> >  		return;
> >  	}
> >  
> > -	memset(keys, 0, sizeof(struct hibernation_keys));
> > +	memset(hibernation_setup_data, 0, size);
> > +	keys = (struct hibernation_keys *) hibernation_setup_data->data;
> >  
> 
> any chance to type stuff correctly so that casts are not
> neccessary?
> 

The data element defined in setup_data struct as u8:
        __u8 data[0];

So I use cast here.

> > +clean_fail:
> > +	hibernation_setup_data->type = SETUP_HIBERNATION_KEYS;
> > +	hibernation_setup_data->len = sizeof(struct hibernation_keys);
> > +	hibernation_setup_data->next = 0;
> > +	keys->hkey_status = efi_status_to_err(status);
> > +
> > +	setup_data = (struct setup_data *)params->hdr.setup_data;
> > +	while (setup_data && setup_data->next)
> > +		setup_data = (struct setup_data *)setup_data->next;
> 
> way too many casts here.
> 
> 							Pavel

I follow setup_efi_pci32() and setup_efi_pci64():

        while (data && data->next)
                data = (struct setup_data *)(unsigned long)data->next;

That's better I also add (unsigned long) cast as setup_efi_pci. Do
you have good suggestion let the above code more graceful?


Thanks a lot!
Joey Lee

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/