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grub: fix incorrect use of a negative value

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This patch adds a fix for an incorrect use of a negative value in grub's
util/glue-efi. 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: de1fe600212ff6d460bdc672d7ca0e13afbe7514)

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 11:05:51 +01:00
committed by Richard Purdie
parent 6360727bb1
commit 9b69e69160
2 changed files with 51 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-bsp/grub/files/0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch
+50
View File
@@ -0,0 +1,50 @@
From e301a0f38a2130eb80f346c31e43bf5089af583c Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Fri, 4 Dec 2020 15:04:28 +0000
Subject: [PATCH] util/glue-efi: Fix incorrect use of a possibly negative value
It is possible for the ftell() function to return a negative value,
although it is fairly unlikely here, we should be checking for
a negative value before we assign it to an unsigned value.
Fixes: CID 73744
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=1641d74e16f9d1ca35ba1a87ee4a0bf3afa48e72]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
util/glue-efi.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/util/glue-efi.c b/util/glue-efi.c
index 68f5316..de0fa6d 100644
--- a/util/glue-efi.c
+++ b/util/glue-efi.c
@@ -39,13 +39,23 @@ write_fat (FILE *in32, FILE *in64, FILE *out, const char *out_filename,
struct grub_macho_fat_header head;
struct grub_macho_fat_arch arch32, arch64;
grub_uint32_t size32, size64;
+ long size;
char *buf;
fseek (in32, 0, SEEK_END);
- size32 = ftell (in32);
+ size = ftell (in32);
+ if (size < 0)
+ grub_util_error ("cannot get end of input file '%s': %s",
+ name32, strerror (errno));
+ size32 = (grub_uint32_t) size;
fseek (in32, 0, SEEK_SET);
+
fseek (in64, 0, SEEK_END);
- size64 = ftell (in64);
+ size = ftell (in64);
+ if (size < 0)
+ grub_util_error ("cannot get end of input file '%s': %s",
+ name64, strerror (errno));
+ size64 = (grub_uint64_t) size;
fseek (in64, 0, SEEK_SET);
head.magic = grub_cpu_to_le32_compile_time (GRUB_MACHO_FAT_EFI_MAGIC);
meta/recipes-bsp/grub/grub2.inc
+1
View File
@@ -89,6 +89,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
file://0040-loader-xnu-Check-if-pointer-is-NULL-before-using-it.patch \
file://0041-util-grub-install-Fix-NULL-pointer-dereferences.patch \
file://0042-util-grub-editenv-Fix-incorrect-casting-of-a-signed-.patch \
file://0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch \
"
SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"