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* Fix a boot crash reported by Mike Galbraith and Mike Krinkin. The

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new EFI memory map reservation code didn't align reservations to
    EFI_PAGE_SIZE boundaries causing bogus regions to be inserted into
    the global EFI memory map - Matt Fleming
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Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into efi/core

Pull EFI fix from Matt Fleming:

 * Fix a boot crash reported by Mike Galbraith and Mike Krinkin. The
   new EFI memory map reservation code didn't align reservations to
   EFI_PAGE_SIZE boundaries causing bogus regions to be inserted into
   the global EFI memory map (Matt Fleming)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2016-09-20 16:59:15 +02:00
commit 2ab78a724b
2 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/platform/efi/quirks.c
View File

@ -201,8 +201,12 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
return;
}
size += addr % EFI_PAGE_SIZE;
size = round_up(size, EFI_PAGE_SIZE);
addr = round_down(addr, EFI_PAGE_SIZE);
mr.range.start = addr;
mr.range.end = addr + size;
mr.range.end = addr + size - 1;
mr.attribute = md.attribute | EFI_MEMORY_RUNTIME;
num_entries = efi_memmap_split_count(&md, &mr.range);

11
drivers/firmware/efi/memmap.c
View File

@ -225,6 +225,17 @@ void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
m_end = mem->range.end;
m_attr = mem->attribute;
/*
* The EFI memory map deals with regions in EFI_PAGE_SIZE
* units. Ensure that the region described by 'mem' is aligned
* correctly.
*/
if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
!IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
WARN_ON(1);
return;
}
for (old = old_memmap->map, new = buf;
old < old_memmap->map_end;
old += old_memmap->desc_size, new += old_memmap->desc_size) {