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grub: fix an integer overflow

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This patch fixes a potential overflow in grub's disk/cryptodisk. It is
a part of a security series [1]

[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html

(From OE-Core rev: 85405f0d3a4b844f7bbb34717bd5f88b81acb074)

Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Marta Rybczynska
2022-02-18 11:05:27 +01:00
committed by Richard Purdie
parent 40d7b77030
commit e97cfd1660
2 changed files with 51 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
meta/recipes-bsp/grub/files/0019-disk-cryptodisk-Fix-potential-integer-overflow.patch Normal file
View File

@@ -0,0 +1,50 @@
From 2550aaa0c23fdf8b6c54e00c6b838f2e3aa81fe2 Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Thu, 21 Jan 2021 11:38:31 +0000
Subject: [PATCH] disk/cryptodisk: Fix potential integer overflow
The encrypt and decrypt functions expect a grub_size_t. So, we need to
ensure that the constant bit shift is using grub_size_t rather than
unsigned int when it is performing the shift.
Fixes: CID 307788
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=a201ad17caa430aa710654fdf2e6ab4c8166f031]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/disk/cryptodisk.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
index 5037768..6883f48 100644
--- a/grub-core/disk/cryptodisk.c
+++ b/grub-core/disk/cryptodisk.c
@@ -311,10 +311,10 @@ grub_cryptodisk_endecrypt (struct grub_cryptodisk *dev,
case GRUB_CRYPTODISK_MODE_CBC:
if (do_encrypt)
err = grub_crypto_cbc_encrypt (dev->cipher, data + i, data + i,
- (1U << dev->log_sector_size), iv);
+ ((grub_size_t) 1 << dev->log_sector_size), iv);
else
err = grub_crypto_cbc_decrypt (dev->cipher, data + i, data + i,
- (1U << dev->log_sector_size), iv);
+ ((grub_size_t) 1 << dev->log_sector_size), iv);
if (err)
return err;
break;
@@ -322,10 +322,10 @@ grub_cryptodisk_endecrypt (struct grub_cryptodisk *dev,
case GRUB_CRYPTODISK_MODE_PCBC:
if (do_encrypt)
err = grub_crypto_pcbc_encrypt (dev->cipher, data + i, data + i,
- (1U << dev->log_sector_size), iv);
+ ((grub_size_t) 1 << dev->log_sector_size), iv);
else
err = grub_crypto_pcbc_decrypt (dev->cipher, data + i, data + i,
- (1U << dev->log_sector_size), iv);
+ ((grub_size_t) 1 << dev->log_sector_size), iv);
if (err)
return err;
break;

1
meta/recipes-bsp/grub/grub2.inc
View File

@@ -65,6 +65,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
file://0016-disk-ldm-Make-sure-comp-data-is-freed-before-exiting.patch \
file://0017-disk-ldm-If-failed-then-free-vg-variable-too.patch \
file://0018-disk-ldm-Fix-memory-leak-on-uninserted-lv-references.patch \
file://0019-disk-cryptodisk-Fix-potential-integer-overflow.patch \
"
SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"