linux: enable BPF_UNPRIV_DEFAULT_OFF between 5.10 and 5.15

Disable unprivileged access to BPF syscalls to prevent denial of service
and privilege escalation via

a) potential speculative execution side-channel-attacks on unmitigated
hardware[0]

or

b) unvalidated memory access in ringbuffer helper functions[1].

Fixes: CVE-2021-4204, CVE-2022-23222

[0] https://ebpf.io/summit-2021-slides/eBPF_Summit_2021-Keynote-Daniel_Borkmann-BPF_and_Spectre.pdf
[1] https://www.openwall.com/lists/oss-security/2022/01/13/1

1 files changed, 2 insertions, 0 deletions

diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index 48adc4ad33c..1b59842e020 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -417,6 +417,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - `retroArchCores` has been removed. This means that using `nixpkgs.config.retroarch` to customize RetroArch cores is not supported anymore. Instead, use package overrides, for example: `retroarch.override { cores = with libretro; [ citra snes9x ]; };`. Also, `retroarchFull` derivation is available for those who want to have all RetroArch cores available.
 
+- The Linux kernel for security reasons now restricts access to BPF syscalls via `BPF_UNPRIV_DEFAULT_OFF=y`. Unprivileged access can be reenabled via the `kernel.unprivileged_bpf_disabled` sysctl knob.
+
 ## Other Notable Changes {#sec-release-21.11-notable-changes}