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Goverp
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Joined: 07 Mar 2007
Posts: 2185
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 Posted: Wed Oct 16, 2024 12:13 pm Post subject: make hardening.config |
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There's a relatively new (kernel 6.7) "hardening.config" "make" target for the kernel. I thought I'd try it. It clams to set various settings which provide more security without too heavy a performance overhead.
It's easy to use - in your kernel build directory (usually /usr/src/linux for vanilla Gentoo setups), and run
| Code: | | make hardening.config |
It keeps the rest of your configuration untouched.
It added a few more checks to my kernel - I disabled some I thought were overkill for my environment. I'll report back later if I notice any performance impact.
(Note that I use git sources from kernel.org rather than gentoo-sources; maybe the latter already include the hardened settings.)
<edit>No noticeable performance impact. I've not tried any benchmarking though.</edit>
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Last edited by Goverp on Wed Oct 16, 2024 3:27 pm; edited 1 time in total |
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pietinger
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Joined: 17 Oct 2006
Posts: 5211
Location: Bavaria
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54619
Location: 56N 3W
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| Posted: Wed Oct 16, 2024 12:51 pm Post subject: |
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Beaten by a short _ead.
gentoo-sources does include several preset knobs for hardening
You can use the groups or set them to your taste
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Computer users fall into two groups:-
those that do backups
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user
Apprentice
Joined: 08 Feb 2004
Posts: 212
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| Posted: Wed Oct 16, 2024 1:57 pm Post subject: |
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Hi,
package app-admin/kernel-hardening-checker is also helpful for searching through unstructured kernel config options regarding hardening items. |
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CaptainBlood
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Joined: 24 Jan 2010
Posts: 3977
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| Posted: Wed Oct 16, 2024 2:38 pm Post subject: |
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| user wrote: | Hi,
package app-admin/kernel-hardening-checker is also helpful for searching through unstructured kernel config options regarding hardening items. |
Using it here.
Some settings must be used with a pinch of salt, | Code: | | CONFIG_STATIC_USERMODEHELPER |
especially which prevents system to boot here.
Some user-space additional work seems required, which role seems to filter kernel calls to user space.
Couldn't find data reliable enough to my taste to start to work on that feature.
| Code: | | CONFIG_BLK_DEV_WRITE_MOUNTED |
is another one I could figure how to work it out.
Prevented from booting IIRC.
All other settings impact are only performance related here.
Some settings make only sense with new enough CPU, e.g. | Code: | | CONFIG_X86_USER_SHADOW_STACK |
which kernel reports for CPU=>2020.
I'd advise to experiment on an alternate version of the kernel.
Setting | Code: | | CONFIG_LOCALVERSION |
should help.
Thks 4 ur attention, interest & support.
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LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. " |
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pietinger
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Joined: 17 Oct 2006
Posts: 5211
Location: Bavaria
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| Posted: Wed Oct 16, 2024 3:21 pm Post subject: |
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| CaptainBlood wrote: | [...] Some settings must be used with a pinch of salt, | Code: | | CONFIG_STATIC_USERMODEHELPER |
especially which prevents system to boot here.
Some user-space additional work seems required, which role seems to filter kernel calls to user space. |
Yes, this is the reason I wrote:
| Quote: | | 8. Enable it and make sure that the PATH is empty. But test it if everything still works afterwards, because I got a report that iptables does not work properly anymore if it has to load netfilter modules (not verified because I have all netfilter modules statically configured in the kernel and therefore have no problem with iptables AND this option). |
I have just added to my article:
https://wiki.gentoo.org/index.php?title=User:Pietinger/Tutorials/Kernel_Hardening_with_KSPP&curid=312650&diff=1316477&oldid=1315956
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