From 0adec29674561034771c13e446069b41ef41e4d4 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Fri, 3 Dec 2021 16:13:28 +0800
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Subject: [PATCH] grub-mkconfig: Restore umask for the grub.cfg
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The commit ab2e53c8a (grub-mkconfig: Honor a symlink when generating
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configuration by grub-mkconfig) has inadvertently discarded umask for
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creating grub.cfg in the process of running grub-mkconfig. The resulting
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wrong permission (0644) would allow unprivileged users to read GRUB
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configuration file content. This presents a low confidentiality risk
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as grub.cfg may contain non-secured plain-text passwords.
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This patch restores the missing umask and sets the creation file mode
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to 0600 preventing unprivileged access.
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Fixes: CVE-2021-3981
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Signed-off-by: Michael Chang <mchang@suse.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream-Status: Backport
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CVE: CVE-2021-3981
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Reference to upstream patch:
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https://git.savannah.gnu.org/cgit/grub.git/commit/?id=0adec29674561034771c13e446069b41ef41e4d4
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Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
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---
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util/grub-mkconfig.in | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
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index c3ea7612e..62335d027 100644
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--- a/util/grub-mkconfig.in
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+++ b/util/grub-mkconfig.in
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@@ -301,7 +301,10 @@ and /etc/grub.d/* files or please file a bug report with
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exit 1
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else
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# none of the children aborted with error, install the new grub.cfg
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+ oldumask=$(umask)
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+ umask 077
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cat ${grub_cfg}.new > ${grub_cfg}
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+ umask $oldumask
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rm -f ${grub_cfg}.new
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fi
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fi
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--
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2.31.1
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