Dear Colin, You has been very clear about the GRUB design.
Please, let me pose another question, because i see you have a solid experience and you are precise. Do you know if the Ubuntu kernel uses BIOS services, in particular the INT 13H interrupt, or if it is BIOS indipendent ? In this last case in which a way Ubuntu treats the low-level disk services ? If I well understood Ubuntu should intercept the call and passes it to the operating system's native disk I/O mechanism, bypassing BIOS routines for the low-level disk reading/writing access. Thanks in advance. Your tips are welcome. Best Regards. Vincenzo. Forensic Consultant Tribunale di Lecce Studio: Strada di Garibaldi - Contrada Paradisi 73010 Lequile (LE) cell: 339.7968555 skype: vincenzo.di_salvo ----Messaggio originale---- Da: cjwat...@ubuntu.com Data: 18-lug-2017 13.28 A: "ingegneriafore...@alice.it"<ingegneriafore...@alice.it> Cc: <grub-devel@gnu.org> Ogg: Re: R: Re: R: Re: CAN GRUB DO WRITING OPERATIONS ON ATTACHED DRIVES ? On Tue, Jul 18, 2017 at 12:38:33PM +0200, ingegneriafore...@alice.it wrote: > I've read with interest your reply and i gave a look at the grub code. > > You wrote an important assertion: "GRUB intentionally has no filesystem > writing support". > > So, the writing operations that grub can do, only be sent to a pre-allocated > memory regions of the disk different in any case from that allocated by the > OS for the filesystem, where the user data are stored. > > This means that grub never can corrupt the user data. > > Please, can you confirm if this my conclusion is right ? Because is this > the crucial question i need to solve. I would never want to rule out the possibility of strange bugs, but that is certainly the design. -- Colin Watson [cjwat...@ubuntu.com]
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