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From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Heinrich Schuchardt <xypron.glpk@gmx.de>
Cc: ardb@kernel.org, Alexander Graf <agraf@csgraf.de>, u-boot@lists.denx.de
Subject: Re: [PATCH] efi_loader: Get rid of kaslr-seed
Date: Thu, 16 Dec 2021 18:01:12 +0200	[thread overview]
Message-ID: <YbtiyNTplKZ/EcOe@hades> (raw)
In-Reply-To: <9b4e59b2-5dd0-6c29-b1c7-8f42b64c231c@gmx.de>

Hi Heinrich, 

> > @@ -40,6 +40,28 @@ static void efi_reserve_memory(u64 addr, u64 size, bool nomap)
> >   			addr, size);
> >   }
> > 
> > +/**
> > + * efi_remove_kaslr_seed() - Removed unused kaslr-seed
> 
> name mismatch
> 
> > + *
> > + * Kernel's EFI STUB only relies on EFI_RNG_PROTOCOL for randomization
> > + * and completely ignores the kaslr-seed.  Weed it out from the DTB we
> > + * hand over, which would mess up our DTB TPM measurements as well.
> > + *
> > + * @fdt: Pointer to device tree
> > + */
> > +void efi_purge_kaslr_seed(void *fdt)
> > +{
> > +	int nodeoff = fdt_path_offset(fdt, "/chosen");
> > +	int err = 0;
> > +
> > +	if (nodeoff < 0)
> > +		return;
> > +
> > +	err = fdt_delprop(fdt, nodeoff, "kaslr-seed");
> > +	if (err < 0)
> > +		log_err("Error deleting kaslr-seed\n");
> 
> If the node does not present this is not an error!

Ah true, I'll fix that

Cheers
/Ilias

      reply	other threads:[~2021-12-16 16:01 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-16 14:52 [PATCH] efi_loader: Get rid of kaslr-seed Ilias Apalodimas
2021-12-16 14:54 ` Ard Biesheuvel
2021-12-16 16:56   ` Mark Kettenis
2021-12-16 17:12     ` Ard Biesheuvel
2021-12-16 17:55       ` Mark Kettenis
2021-12-16 19:00         ` Ard Biesheuvel
2021-12-16 19:53           ` Ilias Apalodimas
2021-12-16 15:25 ` Mark Kettenis
2021-12-16 15:28   ` Ard Biesheuvel
2021-12-16 15:48     ` Mark Kettenis
2021-12-16 15:56       ` Ilias Apalodimas
2021-12-16 15:59       ` Heinrich Schuchardt
2021-12-16 16:04         ` Ilias Apalodimas
2021-12-16 15:59 ` Heinrich Schuchardt
2021-12-16 16:01   ` Ilias Apalodimas [this message]

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