forked from pool/grub2
45 lines
1.5 KiB
Diff
45 lines
1.5 KiB
Diff
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From 7a5022ea64fd6af859383a1731632abc8755b8f7 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Thu, 26 Aug 2021 15:52:00 +0800
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Subject: [PATCH] grub-mkconfig: restore umask for grub.cfg
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Since commit:
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ab2e53c8a grub-mkconfig: Honor a symlink when generating configuration
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by grub-mkconfig
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has inadvertently discarded umask for creating grub.cfg in the process
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of grub-mkconfig. The resulting wrong permission (0644) would allow
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unprivileged users to read grub's configuration file content. This
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presents a low confidentiality risk as grub.cfg may contain non-secured
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plain-text passwords.
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This patch restores the missing umask and set the file mode of creation
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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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---
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util/grub-mkconfig.in | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
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index 7f6d961d2..4aca09d8e 100644
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--- a/util/grub-mkconfig.in
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+++ b/util/grub-mkconfig.in
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@@ -351,7 +351,9 @@ 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); 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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# check if default entry need to be corrected for updated distributor version
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# and/or use fallback entry if default kernel entry removed
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--
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2.31.1
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