[bug #56339] grub-set-default and grub-reboot utilities should check for MENU_ENTRY parameter validity

[tot-to]

URL:
  <https://savannah.gnu.org/bugs/?56339>

                 Summary: grub-set-default and grub-reboot utilities should
check for MENU_ENTRY parameter validity
                 Project: GNU GRUB
            Submitted by: tot_to
            Submitted on: Fri 17 May 2019 12:27:45 PM UTC
                Category: Configuration
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: None
         Planned Release: None

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Details:

In case of a typo in the MENU_ENTRY parameter both grub-set-default and
grub-reboot utilities exit with no error message and with successful exit
status. After the reboot grub will try to load the first menu entry found in
grub.cfg

I believe it it a very serious issue. In case if the first entry refers to an
unbootable configuration on a remote server, it leads to total loose of the
system until physical access is possible!

Steps to reproduce:

# grub-set-default blahblahblah && echo success

Expected results:

1) A error message
2) No change of the default menu entry upon reboot

Actual results:

1) Message 'success' is printed
2) The default menu entry in changed to the fist entry in grub.cfg upon
reboot

The same issue on my distribution's tracker:
https://bugs.gentoo.org/686054




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