[Bug 1812258] Re: Bionic amd64 netboot image has incorrect permissions on kernel

[Dimitri John Ledkov]

netboot images, are generated by debian-installer "source" package, and
then published separately.

The most up to date netboot image, is available from bionic-updates as
usual:

http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/installer-
amd64/

I got the current installer, currently pointed at 20101020ubuntu543.4.

Instead there i downloaded:
http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/installer-amd64/20101020ubuntu543.4/images/netboot/netboot.tar.gz

And the permissions look ok to me there:

$ less netboot.tar.gz | grep amd64/linux
-rw-r--r-- root/root   8277752 2018-12-07 19:31 ./ubuntu-installer/amd64/linux

(note I'm using lesspipe)

Are you sure you are not affected by like a weird umask? are you
unpacking the tarball as a regular user, or root?

** Changed in: debian-installer (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1812258

Title:
  Bionic amd64 netboot image has incorrect permissions on kernel

Status in debian-installer package in Ubuntu:
  Incomplete

Bug description:
  Bionic's amd64 netboot image has changed permissions on the included
  kernel that breaks many tftp daemon configurations. The permissions of
  'ubuntu-installer/amd64/linux' contained in netboot.tar.gz for bionic
  are 0600, however they should be 0644, which matches read permissions
  on all files in netboot.tar.gz. Prior releases and the current cosmic
  release all follow these other read permissions on all files in
  netboot.tar.gz.

  Because many tftp daemons run as a different user than the owner of
  files being served, permitting read from other on this file (and
  additional files required for netboot) is necessary to allow access
  and ultimately to PXE boot the image.

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