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Restrict access to debugfs #77

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merged 1 commit into from Oct 3, 2020
Merged

Restrict access to debugfs #77

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3 changes: 3 additions & 0 deletions debian/control
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Expand Up @@ -126,6 +126,9 @@ Description: enhances misc security settings
* Restricts loading line disciplines to `CAP_SYS_MODULE`.
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* Restricts the `userfaultfd()` syscall to root.
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* Access to debugfs is restricted as it can contain a lot of sensitive
information.
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Improve Entropy Collection
.
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5 changes: 5 additions & 0 deletions etc/default/grub.d/40_kernel_hardening.cfg
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Expand Up @@ -66,3 +66,8 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX extra_latent_entropy"
## Remove "quiet" from GRUB_CMDLINE_LINUX_DEFAULT because "quiet" must be first.
GRUB_CMDLINE_LINUX_DEFAULT="$(echo "$GRUB_CMDLINE_LINUX_DEFAULT" | str_replace "quiet" "")"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX quiet loglevel=0"

## Restrict access to debugfs since it can contain a lot of sensitive information.
## https://lkml.org/lkml/2020/7/16/122
## https://github.com/torvalds/linux/blob/fb1201aececc59990b75ef59fca93ae4aa1e1444/Documentation/admin-guide/kernel-parameters.txt#L835-L848
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX debugfs=off"