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CONFIG_BPF_UNPRIV_DEFAULT_OFF: Disable unprivileged BPF by default

General informations

The Linux kernel configuration item CONFIG_BPF_UNPRIV_DEFAULT_OFF:

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Disables unprivileged BPF by default by setting the corresponding /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can still reenable it by setting it to 0 later on, or permanently disable it by setting it to 1 (from which no other transition to 0 is possible anymore).

Unprivileged BPF could be used to exploit certain potential speculative execution side-channel vulnerabilities on unmitigated affected hardware.

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