7b0809bc3a
When GRUB runs on top of EFI firmware, it only has access to block and network device abstractions exposed by the firmware, and it is up to the firmware to quiesce the underlying hardware when exiting boot services and handing over to the OS. This is especially important for network devices, to prevent incoming packets from being DMA'd straight into memory after the OS has taken over but before it has managed to reconfigure the network hardware. GRUB handles this by means of the grub_net_fini_hw() preboot hook, which is executed before calling into the booted image. This means that all network devices disappear or become inoperable before the EFI stub executes on EFI targeted builds. This is problematic as it prevents the EFI stub from calling back into GRUB provided protocols such as LoadFile2 for the initrd, which we will provide in a subsequent patch. So add a flag that indicates to the network core that EFI network devices should not be closed when grub_net_fini_hw() is called. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'