2022-05-17 10:25:31 +00:00
|
|
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Michael Chang via Grub-devel <grub-devel@gnu.org>
|
|
|
|
|
Date: Fri, 3 Dec 2021 16:13:28 +0800
|
|
|
|
|
Subject: [PATCH] grub-mkconfig: restore umask for grub.cfg
|
|
|
|
|
|
|
|
|
|
Since commit:
|
|
|
|
|
|
|
|
|
|
ab2e53c8a grub-mkconfig: Honor a symlink when generating configuration
|
|
|
|
|
by grub-mkconfig
|
|
|
|
|
|
|
|
|
|
has inadvertently discarded umask for creating grub.cfg in the process
|
|
|
|
|
of grub-mkconfig. The resulting wrong permission (0644) would allow
|
|
|
|
|
unprivileged users to read grub's configuration file content. This
|
|
|
|
|
presents a low confidentiality risk as grub.cfg may contain non-secured
|
|
|
|
|
plain-text passwords.
|
|
|
|
|
|
|
|
|
|
This patch restores the missing umask and set the file mode of creation
|
|
|
|
|
to 0600 preventing unprivileged access.
|
|
|
|
|
|
|
|
|
|
Fixes: CVE-2021-3981
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Michael Chang <mchang@suse.com>
|
|
|
|
|
---
|
|
|
|
|
util/grub-mkconfig.in | 2 ++
|
|
|
|
|
1 file changed, 2 insertions(+)
|
|
|
|
|
|
|
|
|
|
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
|
2023-04-11 14:25:15 +00:00
|
|
|
index f55339a3f6..520a672cd2 100644
|
2022-05-17 10:25:31 +00:00
|
|
|
--- a/util/grub-mkconfig.in
|
|
|
|
|
+++ b/util/grub-mkconfig.in
|
|
|
|
|
@@ -311,7 +311,9 @@ and /etc/grub.d/* files or please file a bug report with
|
|
|
|
|
exit 1
|
|
|
|
|
else
|
|
|
|
|
# none of the children aborted with error, install the new grub.cfg
|
|
|
|
|
+ oldumask=$(umask); umask 077
|
|
|
|
|
cat ${grub_cfg}.new > ${grub_cfg}
|
|
|
|
|
+ umask $oldumask
|
|
|
|
|
rm -f ${grub_cfg}.new
|
|
|
|
|
fi
|
|
|
|
|
fi
|
