From 1543d9204f0bd32c3c06da2b55c7d531a88a0c95 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Mon, 21 Nov 2016 15:34:00 +0100
Subject: [PATCH 163/206] efi/chainloader: fix wrong sanity check in
relocate_coff()
In relocate_coff(), the relocation entries are parsed from the original
image (not the section-wise copied image). The original image is
pointed-to by the "orig" pointer. The current check
(void *)reloc_end < data
compares the addresses of independent memory allocations. "data" is a typo
here, it should be "orig".
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1347291
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Bogdan Costescu <bcostescu@gmail.com>
Tested-by: Juan Orti <j.orti.alcaine@gmail.com>
---
grub-core/loader/efi/chainloader.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index b977c7b5573..d5ab21d09c3 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -401,7 +401,7 @@ relocate_coff (pe_coff_loader_image_context_t *context,
reloc_end = (struct grub_pe32_fixup_block *)
((char *)reloc_base + reloc_base->size);
- if ((void *)reloc_end < data || (void *)reloc_end > image_end)
+ if ((void *)reloc_end < orig || (void *)reloc_end > image_end)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "Reloc entry %d overflows binary",
n);
--
2.15.0