** Changed in: linux-aws (Ubuntu)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu)
Status: New => In Progress
** Changed in: linux-aws (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
** Changed in: linux-gcp (Ubuntu)
Importance: Undecided => High
** Changed in: linux-gcp (Ubuntu)
Status: New => In Progress
** Changed in: linux-gcp (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
** Changed in: linux-kvm (Ubuntu)
Importance: Undecided => High
** Changed in: linux-kvm (Ubuntu)
Status: New => In Progress
** Changed in: linux-kvm (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-gcp in Ubuntu.
https://bugs.launchpad.net/bugs/1823754
Title:
Set CONFIG_RANDOM_TRUST_CPU=y
Status in linux-aws package in Ubuntu:
In Progress
Status in linux-azure package in Ubuntu:
In Progress
Status in linux-gcp package in Ubuntu:
In Progress
Status in linux-kvm package in Ubuntu:
In Progress
Bug description:
SRU Justification
Impact: Turning this option on will make our kernels by default trust
the CPU's random number generator for the purpose of initializing the
kernel's CRNG on Intel, AMD, and IBM CPUs. Users can disable this at
boot time by passing random.trust_cpu=off. Turning this on has the
potential to prevent getrandom(2) from blocking during early boot.
This option was turned on in the master kernel shortly before disco
kernel freeze; this bug is about propagating the option to derivative
kernels.
Regression Potential: No user-visible regressions are expected. Some
security-conscious users may prefer to not trust the CPU maker's RNG,
but in that case the boot options is available.
Test Case: The benefit is difficult to verify empirically in Ubuntu
kernels since we carry a patch to avoid problems with getrandom(2)
blocking immediately following boot. However, it is possible to see
whether or not the kernel used the CPU RNG for initializing the CRNG
by searching for the string "random: crng done (trusting CPU's
manufacturer)" in dmesg.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/1823754/+subscriptions
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