Re: [PATCH 2/5] filetype: add GPT support

[Sascha Hauer <s.hauer@pengutronix.de>]

On Thu, Feb 14, 2013 at 06:05:07PM +0100, Johannes Stezenbach wrote:
> On Thu, Feb 14, 2013 at 05:53:23PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 17:36 Thu 14 Feb     , Sascha Hauer wrote:
> > > On Thu, Feb 14, 2013 at 04:52:24PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > GPT need to be check before MBR
> > > > 
> > > > Cc: Rob Herring <rob.herring@calxeda.com>
> > > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > > > ---
> > > >  common/filetype.c  |    4 ++++
> > > >  include/filetype.h |    1 +
> > > >  2 files changed, 5 insertions(+)
> > > > 
> > > > diff --git a/common/filetype.c b/common/filetype.c
> > > > index 22fc621..6563ecc 100644
> > > > --- a/common/filetype.c
> > > > +++ b/common/filetype.c
> > > > @@ -48,6 +48,7 @@ static const struct filetype_str filetype_str[] = {
> > > >  	[filetype_bmp] = { "BMP image", "bmp" },
> > > >  	[filetype_png] = { "PNG image", "png" },
> > > >  	[filetype_ext] = { "ext filesystem", "ext" },
> > > > +	[filetype_gpt] = { "GUID Partition Table", "gpt" },
> > > >  };
> > > >  
> > > >  const char *file_type_to_string(enum filetype f)
> > > > @@ -159,6 +160,9 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize)
> > > >  	if (bufsize < 512)
> > > >  		return filetype_unknown;
> > > >  
> > > > +	if (bufsize >= 520 && strncmp(&buf8[512], "EFI PART", 8) == 0)
> > > > +		return filetype_gpt;
> > > > +
> > > 
> > > The list is sorted by size, so please move this below:
> > on purpose
> > 
> > EFI need to be detect before mbr
> 
> IMHO the check is too simple, it will give false positive if
> GPT is replaced by DOS MBR and not zeroed out.  Need to check
> for protective MBR.

So is_fat_or_mbr() should test if the MBR is a protective MBR and return
false in this case?

Sascha

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