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
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@ -1420,6 +1420,15 @@ Superuser created successfully.
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for those who want to have all RetroArch cores available.
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</para>
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</listitem>
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<listitem>
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<para>
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The Linux kernel for security reasons now restricts access to
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BPF syscalls via <literal>BPF_UNPRIV_DEFAULT_OFF=y</literal>.
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Unprivileged access can be reenabled via the
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<literal>kernel.unprivileged_bpf_disabled</literal> sysctl
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knob.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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<section xml:id="sec-release-21.11-notable-changes">
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@ -417,6 +417,8 @@ In addition to numerous new and upgraded packages, this release has the followin
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- `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.
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- 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.
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## Other Notable Changes {#sec-release-21.11-notable-changes}
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@ -539,6 +539,7 @@ let
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UPROBE_EVENT = { optional = true; tristate = whenOlder "4.11" "y";};
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UPROBE_EVENTS = { optional = true; tristate = whenAtLeast "4.11" "y";};
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BPF_SYSCALL = whenAtLeast "4.4" yes;
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BPF_UNPRIV_DEFAULT_OFF = whenBetween "5.10" "5.15" yes;
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BPF_EVENTS = whenAtLeast "4.4" yes;
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FUNCTION_PROFILER = yes;
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RING_BUFFER_BENCHMARK = no;
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