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[Bug 1860914] Re: QEMU prepends pathnames to command lines of Multiboot
From: |
felix |
Subject: |
[Bug 1860914] Re: QEMU prepends pathnames to command lines of Multiboot kernels and modules, contrary to the specification |
Date: |
Sun, 14 Jun 2020 07:01:34 -0000 |
** Patch added: "cmdline.patch"
https://bugs.launchpad.net/qemu/+bug/1860914/+attachment/5383658/+files/cmdline.patch
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https://bugs.launchpad.net/bugs/1860914
Title:
QEMU prepends pathnames to command lines of Multiboot kernels and
modules, contrary to the specification
Status in QEMU:
New
Bug description:
When QEMU is launched with the -kernel option to boot a Multiboot
image, the command line passed in the -append option is additionally
prefixed the pathname of the kernel image and a space. Likewise,
module command lines passed in the -initrd option are passed with the
module pathname and a space prepended. At the very least the former is
contary to what is prescribed in the Multiboot specification, version
0.6.96[0], which says in ยง3.3:
> General-purpose boot loaders should allow user a complete control on
command line independently of other factors like image name.
With respect to module command lines, the spec is less clear, but GNU
GRUB2 (the de facto reference implementation) does not prepend
pathnames to command lines of either. I haven't tested GRUB legacy,
but I assume it exhibits the same behaviour. It would be strange if
passing pathnames was in fact intended; bootloader pathnames are
useless to the loaded kernel, which may potentially have a completely
different view of the file system from the bootloader.
Also, given that a kernel pathname may contain spaces, skipping it in
the command line cannot be done reliably, while loading a Multiboot
module from a pathname that contains spaces is outright impossible.
Found in 4.2.0, but latest git master apparently behaves the same.
[0]: https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
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