[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen
On Mon, Oct 21, 2013 at 11:16:24PM +0200, Vladimir 'Ï-coder/phcoder' Serbinenko wrote: > Mail is big, I think I got your essential points but I didn't read it whole. > On 21.10.2013 14:57, Daniel Kiper wrote: > > Hi, > > > > During work on multiboot2 protocol support for Xen it was discovered > > that memory map passed via relevant tag could not represent wide range > > of memory types available on EFI platforms. Additionally, GRUB2 > > implementation calls ExitBootServices() on them just before jumping > > into loaded image. In this situation loaded system could not clearly > > identify reserved memory regions, EFI runtime services regions and others. > > > Will a multiboot2 tag with whole EFI memory map solve your problem? > > Additionally, it should be mentioned that there is no possibility or it > > could > > be very difficult to implement secure boot on EFI platforms using GRUB2 as > > boot > > loader because, as it was mentioned earlier, it calls ExitBootServices(). > > > GRUB has generic support for signing kernels/modules/whatsoever using > GnuPG signatures. You'd just have to ship xen.sig and kernel.sig. This > method doesn't have any controversy associated with EFI stuff but at > this particular case does exactly the same thing: verify signature. > multiboot2 is mainly memory structure specification so probably how the > files are checked is outside of its scope. But it's possible to add > specification on how to embed signatures in kernel. I think that EFI signatures should be supported because they are quite common right now. However, I think that it is also worth to support GnuPG signatures. This way anybody will be able to choose good solution for a given case. Daniel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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