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x86/boot: Introduce setup_indirect

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The setup_data is a bit awkward to use for extremely large data objects,
both because the setup_data header has to be adjacent to the data object
and because it has a 32-bit length field. However, it is important that
intermediate stages of the boot process have a way to identify which
chunks of memory are occupied by kernel data. Thus introduce an uniform
way to specify such indirect data as setup_indirect struct and
SETUP_INDIRECT type.

And finally bump setup_header version in arch/x86/boot/header.S.

Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: ard.biesheuvel@linaro.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: dave.hansen@linux.intel.com
Cc: eric.snowberg@oracle.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juergen Gross <jgross@suse.com>
Cc: kanth.ghatraju@oracle.com
Cc: linux-doc@vger.kernel.org
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rdunlap@infradead.org
Cc: ross.philipson@oracle.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: xen-devel@lists.xenproject.org
Link: https://lkml.kernel.org/r/20191112134640.16035-4-daniel.kiper@oracle.com
This commit is contained in:
Daniel Kiper
2019-11-12 14:46:40 +01:00
committed by Borislav Petkov
parent 00cd1c154d
commit b3c72fc9a7
10 changed files with 138 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/boot/compressed/kaslr.c
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@@ -459,6 +459,18 @@ static bool mem_avoid_overlap(struct mem_vector *img,
is_overlapping = true;
}
if (ptr->type == SETUP_INDIRECT &&
((struct setup_indirect *)ptr->data)->type != SETUP_INDIRECT) {
avoid.start = ((struct setup_indirect *)ptr->data)->addr;
avoid.size = ((struct setup_indirect *)ptr->data)->len;
if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) {
*overlap = avoid;
earliest = overlap->start;
is_overlapping = true;
}
}
ptr = (struct setup_data *)(unsigned long)ptr->next;
}