From: David Laight <David.Laight@ACULAB.COM>
To: 'Karel Zak' <kzak@redhat.com>,
Eugene Korenevsky <ekorenevsky@gmail.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: RE: [PATCH v2] efi: take size of partition entry from GPT header
Date: Thu, 13 Sep 2018 13:06:13 +0000 [thread overview]
Message-ID: <6d349d22d37041c1a2942d8ed4c76b69@AcuMS.aculab.com> (raw)
In-Reply-To: <20180912083844.iegei2kobcz4b7ag@ws.net.home>
From: Karel Zak
> Sent: 12 September 2018 09:39
> On Tue, Sep 11, 2018 at 07:15:27PM +0300, Eugene Korenevsky wrote:
> > +static gpt_entry *get_gpt_entry(gpt_header *gpt_hdr, gpt_entry *ptes, u32 index)
> > +{
> > + return (gpt_entry *)((u8 *)ptes + gpt->sizeof_partition_entry * index);
>
> I guess header use LE, so you need:
>
> le32_to_cpu(gpt_hdr->sizeof_partition_entry)
I suspect you also need a sanity check that the value isn't too small
or stupidly large.
In principle slightly short lengths presumably imply that the disk
was formatted with an older standard - so the last fields should be
ignored.
They may not be any such disks - until the on-disk structure is extended
and the kernel structure updated to match.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2018-09-13 13:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-11 16:15 [PATCH v2] efi: take size of partition entry from GPT header Eugene Korenevsky
2018-09-11 16:27 ` Davidlohr Bueso
2018-09-11 16:42 ` Eugene Korenevsky
2018-09-11 22:56 ` kbuild test robot
2018-09-11 22:59 ` Ard Biesheuvel
2018-09-11 23:20 ` kbuild test robot
2018-09-12 8:38 ` Karel Zak
2018-09-13 13:06 ` David Laight [this message]
2018-09-13 19:48 ` Eugene Korenevsky
2018-09-14 9:01 ` David Laight
2018-09-14 11:07 ` kzak
2018-10-06 18:41 ` Eugene Korenevsky
2018-10-08 11:15 ` Karel Zak
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