The IPFire team is taking pro-active security measures when it comes to protecting the kernel. One of the approaches IPFire is introducing is kernel code signing to verify that the kernel has not been maliciously altered. "In IPFire 2.25 - Core Update 142, we are now cryptographically signing all kernel modules. That means every time a driver for a network adapter, a filesystem driver or other kernel module is loaded into the kernel, it is checked that this signature matches. The signature is added during compile time of the kernel and after we are done with that, we throw the key away.Nobody needs it any more. Nobody - not even we - have now the ability to change the kernel any more. The only way to change a line of code somewhere is to rebuild and re-ship the whole kernel." Further details are available in the distribution's blog post.
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