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grub: add a fix for a length check

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This patch adds a fix for a volume name length check in grub's
hfsplus. 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: 29470a74b944921641cd5d84b88c359acba26ad4)

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 11:05:28 +01:00
committed by Richard Purdie
parent e97cfd1660
commit 3348511b94
2 changed files with 44 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-bsp/grub/files/0020-hfsplus-Check-that-the-volume-name-length-is-valid.patch
+43
View File
@@ -0,0 +1,43 @@
From 7c1813eeec78892fa651046cc224ae4e80d0c94d Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Fri, 23 Oct 2020 17:09:31 +0000
Subject: [PATCH] hfsplus: Check that the volume name length is valid
HFS+ documentation suggests that the maximum filename and volume name is
255 Unicode characters in length.
So, when converting from big-endian to little-endian, we should ensure
that the name of the volume has a length that is between 0 and 255,
inclusive.
Fixes: CID 73641
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=2298f6e0d951251bb9ca97d891d1bc8b74515f8c]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/fs/hfsplus.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index dae43be..03c3c4c 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -1007,6 +1007,15 @@ grub_hfsplus_label (grub_device_t device, char **label)
grub_hfsplus_btree_recptr (&data->catalog_tree, node, ptr);
label_len = grub_be_to_cpu16 (catkey->namelen);
+
+ /* Ensure that the length is >= 0. */
+ if (label_len < 0)
+ label_len = 0;
+
+ /* Ensure label length is at most 255 Unicode characters. */
+ if (label_len > 255)
+ label_len = 255;
+
label_name = grub_calloc (label_len, sizeof (*label_name));
if (!label_name)
{
meta/recipes-bsp/grub/grub2.inc
+1
View File
@@ -66,6 +66,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
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 \
file://0020-hfsplus-Check-that-the-volume-name-length-is-valid.patch \
"
SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"