URL:
<http://savannah.gnu.org/bugs/?45729>
Summary: Reboot or hang when missing network modules
Project: GNU GRUB
Submitted by: dev_null42
Submitted on: Tue 11 Aug 2015 12:31:27 AM GMT
Category: Network
Severity: Major
Priority: 5 - Normal
Item Group: Software Error
Status: None
Privacy: Public
Assigned to: None
Originator Name: Jason Tang
Originator Email: t...@jtang.org
Open/Closed: Open
Discussion Lock: Any
Release:
Release: Git master
Reproducibility: Every Time
Planned Release: None
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Details:
On a modern x86 UEFI system, I tried PXE booting GRUB2. After the "Welcome to
GRUB!" message, GRUB would either (a) reboot itself, (b) hang, or (c) go into
an infinite loop. I traced the problem down to grub-core/net/net.c, in
grub_net_open_real(). I had accidentally not included the TFTP module into
bootx64.efi.
There is no error checking on the call to grub_dl_load() for tftp (nor http).
If the load fails, GRUB continues running and seems to corrupt its call stack,
thus accounting for the observed inconsistent behavior. I propose that the
code should check the return value to grub_dl_load(). If it is zero, then GRUB
should panic and go into a failure mode, instead of continuing.
_______________________________________________________
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