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37 lines
1.3 KiB
37 lines
1.3 KiB
1 month ago
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Solar Designer <solar@openwall.com>
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Date: Tue, 6 Feb 2024 22:05:45 +0100
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Subject: [PATCH] grub-set-bootflag: Exit calmly when not running as root
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Exit calmly when not installed SUID root and invoked by non-root. This
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allows installing user/grub-boot-success.service unconditionally while
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supporting non-SUID installation of the program for some limited usage.
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Signed-off-by: Solar Designer <solar@openwall.com>
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---
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util/grub-set-bootflag.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/util/grub-set-bootflag.c b/util/grub-set-bootflag.c
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index 514c4f9091ac..31a868aeca8a 100644
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--- a/util/grub-set-bootflag.c
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+++ b/util/grub-set-bootflag.c
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@@ -98,6 +98,17 @@ int main(int argc, char *argv[])
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bootflag = bootflags[i];
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len = strlen (bootflag);
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+ /*
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+ * Exit calmly when not installed SUID root and invoked by non-root. This
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+ * allows installing user/grub-boot-success.service unconditionally while
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+ * supporting non-SUID installation of the program for some limited usage.
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+ */
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+ if (geteuid())
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+ {
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+ printf ("grub-set-bootflag not running as root, no action taken\n");
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+ return 0;
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+ }
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+
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/*
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* setegid avoids the new grubenv's gid being that of the user.
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*/
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