linux-kernel - Re: [PATCH v5 10/14] efi: only print saved efi runtime maps instead of all memmap ranges for kexec

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:	Mon, 16 Dec 2013 12:33:24 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, greg@...ah.com, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [PATCH v5 10/14] efi: only print saved efi runtime maps instead
 of all memmap ranges for kexec

On Mon, Dec 16, 2013 at 10:00:10AM +0800, Dave Young wrote:
> > > -	print_efi_memmap();
> > > +	if (efi_setup) {
> > > +		int s;
> > > +		struct efi_setup_data *data;
> > > +
> > > +		s = sizeof(*data) + nr_efi_runtime_map * sizeof(data->map[0]);
> > > +		data = early_memremap(efi_setup, s);
> > > +		if (!data)
> > > +			return;
> > > +		print_efi_memmap(data->map, nr_efi_runtime_map,
> > > +				 sizeof(data->map[0]));
> > > +		early_memunmap(data, s);
> > 
> > Well, if you call print_efi_memmap() in parse_efi_setup() you can save
> > yourself that map/unmaping no?
> 
> In parse_efi_setup, I need map twice as well:

Well, your v6 has a something completely different:

void __init parse_efi_setup(u64 phys_addr)
{
        efi_setup = phys_addr;
}

There's no mapping at all anymore. So please redo your reply against v6.

> Another where what I print in this patch is same position what
> non-kexec kernel does, it looks better that print them only if earlier
> init is ok.

-ENOPARSE.

All I'm saying is, if you're going to memremap/memunmap efi_setup,
then do it once in efi_setup_init() as you do already and call
print_efi_memmap from there - no need to do work twice for no reason.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--
--
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/