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grub: add a fix for a possible unintended sign extension

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This patch fixes a possible unintended sign extension in grub's
libgcrypt/mpi. 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: 69f6ae604b857eea93022d73fad668df07a7a056)

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 11:05:34 +01:00
committed by Richard Purdie
parent 10d619c8bb
commit e2f193d252
2 changed files with 37 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
meta/recipes-bsp/grub/files/0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch Normal file
View File

@@ -0,0 +1,36 @@
From 9b16d7bcad1c7fea7f26eb2fb3af1a5ca70ba34e Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Tue, 3 Nov 2020 16:43:37 +0000
Subject: [PATCH] libgcrypt/mpi: Fix possible unintended sign extension
The array of unsigned char gets promoted to a signed 32-bit int before
it is finally promoted to a size_t. There is the possibility that this
may result in the signed-bit being set for the intermediate signed
32-bit int. We should ensure that the promotion is to the correct type
before we bitwise-OR the values.
Fixes: CID 96697
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=e8814c811132a70f9b55418f7567378a34ad3883]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/lib/libgcrypt/mpi/mpicoder.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/grub-core/lib/libgcrypt/mpi/mpicoder.c b/grub-core/lib/libgcrypt/mpi/mpicoder.c
index a3435ed..7ecad27 100644
--- a/grub-core/lib/libgcrypt/mpi/mpicoder.c
+++ b/grub-core/lib/libgcrypt/mpi/mpicoder.c
@@ -458,7 +458,7 @@ gcry_mpi_scan (struct gcry_mpi **ret_mpi, enum gcry_mpi_format format,
if (len && len < 4)
return gcry_error (GPG_ERR_TOO_SHORT);
- n = (s[0] << 24 | s[1] << 16 | s[2] << 8 | s[3]);
+ n = ((size_t)s[0] << 24 | (size_t)s[1] << 16 | (size_t)s[2] << 8 | (size_t)s[3]);
s += 4;
if (len)
len -= 4;

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

@@ -72,6 +72,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
file://0023-zfs-Fix-possible-integer-overflows.patch \
file://0024-zfsinfo-Correct-a-check-for-error-allocating-memory.patch \
file://0025-affs-Fix-memory-leaks.patch \
file://0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch \
"
SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"