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Minor clean up of kernel parameter settings

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Signed-off-by: Tommy <contact@tommytran.io>
This commit is contained in:
Tommy 2024-06-16 13:05:32 -07:00
parent 9001a58ccf
commit 3fa329fc41
Signed by: Tomster
GPG Key ID: 555C902A34EC968F
1 changed files with 9 additions and 9 deletions
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content/posts/linux/Desktop Linux Hardening.md
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@ -291,7 +291,7 @@ If you are using Kicksecure or Whonix, most of this hardening is included by def
#### Boot Parameters
_See ["2.3&nbsp;Boot parameters"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#boot-parameters) in Madaidan's guide and [Kicksecure boot parameters](https://github.com/Kicksecure/security-misc/tree/master/etc/default/grub.d). If desired, [formal documentation of boot parameters](https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html) is available upstream._
_See ["2.3&nbsp;Boot parameters"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#boot-parameters) in Madaidan's guide. If desired, [formal documentation of boot parameters](https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html) is available upstream._
Copy these parameters into [your bootloader's configuration](https://wiki.archlinux.org/title/Kernel_parameters#Configuration). On rpm&#8209;ostree distributions, make sure to use `rpm-ostree kargs` rather than editing GRUB configuration directly.
@ -305,14 +305,6 @@ mitigations=auto,nosmt spectre_v2=on spectre_bhi=on spec_store_bypass_disable=on
Note however that disabling SMT may have a significant performance impact&nbsp;--- [for this reason the popular linux&#8209;hardened kernel for Arch does not disable SMT](https://github.com/anthraxx/linux-hardened/issues/37#issuecomment-619597365) by default. Assess your own risk tolerance, and, if you choose to keep SMT enabled, simply remove all occurrences of `nosmt` and `nosmt=force` from these parameters.
##### Kernel
```
slab_nomerge init_on_alloc=1 init_on_free=1 pti=on vsyscall=none ia32_emulation=0 page_alloc.shuffle=1 randomize_kstack_offset=on debugfs=off oops=panic quiet loglevel=0
```
Kicksecure does not enforce either `module.sig_enforce=1` or `lockdown=confidentiality` by default as they lead to a lot of hardware compatibility issues; consider enabling these if possible on your system. Additionally, [`mce=0` is no longer recommended](https://forums.whonix.org/t/kernel-hardening/7296/493).
##### Entropy generation
```
@ -351,6 +343,14 @@ Further reading:
- [Avoiding gaps in IOMMU protection at boot](https://mjg59.dreamwidth.org/54433.html)
- [Madaidan: DMA attacks](https://madaidans-insecurities.github.io/guides/linux-hardening.html#dma-attacks)
##### Kernel
```
slab_nomerge init_on_alloc=1 init_on_free=1 pti=on vsyscall=none ia32_emulation=0 page_alloc.shuffle=1 randomize_kstack_offset=on debugfs=off
```
Consider adding `oops=panic` to the list of kernel parameters as well. This tells the kernel to panic when there are oops error, thus preventing a broken process from being run. However, there may be some harmless errors generated by drivers, and these can cause the system to unexpectedly crash with this parameter.
#### Kernel Modules
_See ["2.5.2&nbsp;Blacklisting kernel modules"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#kasr-kernel-modules) in Madaidan's guide._