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905920: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=905920
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--- Begin Message ---
Package: initramfs-tools
Version: 0.131ubuntu8
Severity: normal
Tags: security
I have fully encrypted (UEFI, LUKS, BTRFS) system and in order to avoid typing
password for the second time after GRUB2 added `keyscript` option to
`/etc/crypttab`.
Keyscript file is only readable by root, however, resulting `initrd.img*` file
is readable by anyone, which I think is a security issue.
I'd like to see `initrd.img*` files to also be readable by root user only.
-- Package-specific info:
-- initramfs sizes
-rw-r--r-- 1 root root 53M Aug 11 19:50 /boot/initrd.img-4.17.0-5-generic
-rw-r--r-- 1 root root 53M Aug 11 19:49 /boot/initrd.img-4.17.0-6-generic
-rw-r--r-- 1 root root 53M Aug 11 19:49 /boot/initrd.img-4.17.0-7-generic
-- /proc/cmdline
BOOT_IMAGE=/root/boot/vmlinuz-4.17.0-5-generic
root=UUID=5170aca4-061a-4c6c-ab00-bd7fc8ae6030 ro rootflags=subvol=root
nosplash intel_pstate=disable scsi_mod.use_blk_mq=1 intel_iommu=on
i915.fastboot=1
-- /etc/crypttab
# <target name> <source device> <key file> <options>
system UUID=739967f1-9770-470a-a031-8d8b8bcdb350 none
luks,discard,keyscript=/etc/cryptroot/system.64.sh
-- System Information:
Debian Release: buster/sid
APT prefers cosmic-proposed
APT policy: (500, 'cosmic-proposed'), (500, 'cosmic')
Architecture: amd64 (x86_64)
--- End Message ---
--- Begin Message ---
On Sat, 2018-08-11 at 21:07 +0300, Nazar Mokrynskyi wrote:
> Package: initramfs-tools
> Version: 0.131ubuntu8
> Severity: normal
> Tags: security
>
> I have fully encrypted (UEFI, LUKS, BTRFS) system and in order to
> avoid typing password for the second time after GRUB2 added
> `keyscript` option to `/etc/crypttab`.
> Keyscript file is only readable by root, however, resulting
> `initrd.img*` file is readable by anyone, which I think is a security
> issue.
> I'd like to see `initrd.img*` files to also be readable by root user
> only.
Set the UMASK paramter, documented in initramfs.conf(5).
Ben.
--
Ben Hutchings
Time is nature's way of making sure that
everything doesn't happen at once.
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--- End Message ---
