Commit-ID: a7f84f03f660d93574ac88835d056c0d6468aebe
Gitweb: http://git.kernel.org/tip/a7f84f03f660d93574ac88835d056c0d6468aebe
Author: Dave Young <dyoung@xxxxxxxxxx>
AuthorDate: Fri, 20 Dec 2013 18:02:15 +0800
Committer: Matt Fleming <matt.fleming@xxxxxxxxx>
CommitDate: Sat, 21 Dec 2013 15:29:26 +0000
x86/efi: Fix off-by-one bug in EFI Boot Services reservation
Current code check boot service region with kernel text region by:
start+size >= __pa_symbol(_text)
The end of the above region should be start + size - 1 instead.
I see this problem in ovmf + Fedora 19 grub boot:
text start: 1000000 md start: 800000 md size: 800000
Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
Acked-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Toshi Kani <toshi.kani@xxxxxx>
Tested-by: Toshi Kani <toshi.kani@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
---
arch/x86/platform/efi/efi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index f8ec4da..15e3b5e 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -438,7 +438,7 @@ void __init efi_reserve_boot_services(void)
* - Not within any part of the kernel
* - Not the bios reserved area
*/
- if ((start+size >= __pa_symbol(_text)
+ if ((start + size > __pa_symbol(_text)
&& start <= __pa_symbol(_end)) ||
!e820_all_mapped(start, start+size, E820_RAM) ||
memblock_is_region_reserved(start, size)) {
--
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