You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
1.4 KiB
46 lines
1.4 KiB
From f759247e7706c921d1300e67a7ebcb5a997d43aa Mon Sep 17 00:00:00 2001 |
|
From: Alexey Makhalov <amakhalov@vmware.com> |
|
Date: Fri, 17 Jul 2020 05:17:26 +0000 |
|
Subject: [PATCH 317/336] relocator: Fix grub_relocator_alloc_chunk_align() top |
|
memory allocation |
|
|
|
Current implementation of grub_relocator_alloc_chunk_align() |
|
does not allow allocation of the top byte. |
|
|
|
Assuming input args are: |
|
max_addr = 0xfffff000; |
|
size = 0x1000; |
|
|
|
And this is valid. But following overflow protection will |
|
unnecessarily move max_addr one byte down (to 0xffffefff): |
|
if (max_addr > ~size) |
|
max_addr = ~size; |
|
|
|
~size + 1 will fix the situation. In addition, check size |
|
for non zero to do not zero max_addr. |
|
|
|
Signed-off-by: Alexey Makhalov <amakhalov@vmware.com> |
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> |
|
Upstream-commit-id: ab80a97eb1f |
|
--- |
|
grub-core/lib/relocator.c | 4 ++-- |
|
1 file changed, 2 insertions(+), 2 deletions(-) |
|
|
|
diff --git a/grub-core/lib/relocator.c b/grub-core/lib/relocator.c |
|
index 7ea72069a45..833ace70eb3 100644 |
|
--- a/grub-core/lib/relocator.c |
|
+++ b/grub-core/lib/relocator.c |
|
@@ -1376,8 +1376,8 @@ grub_relocator_alloc_chunk_align (struct grub_relocator *rel, |
|
}; |
|
grub_addr_t min_addr2 = 0, max_addr2; |
|
|
|
- if (max_addr > ~size) |
|
- max_addr = ~size; |
|
+ if (size && (max_addr > ~size)) |
|
+ max_addr = ~size + 1; |
|
|
|
#ifdef GRUB_MACHINE_PCBIOS |
|
if (min_addr < 0x1000) |
|
-- |
|
2.26.2 |
|
|
|
|