sysctl: setting key "net.core.bpf_jit_enable": Invalid argument
From: Paul Menzel <hidden>
Date: 2021-04-11 11:09:25
Also in:
bpf, linuxppc-dev
Dear Linux folks,
Related to * [CVE-2021-29154] Linux kernel incorrect computation of
branch displacements in BPF JIT compiler can be abused to execute
arbitrary code in Kernel mode* [1], on the POWER8 system IBM S822LC with
self-built Linux 5.12.0-rc5+, I am unable to disable `bpf_jit_enable`.
$ /sbin/sysctl net.core.bpf_jit_enable
net.core.bpf_jit_enable = 1
$ sudo /sbin/sysctl -w net.core.bpf_jit_enable=0
sysctl: setting key "net.core.bpf_jit_enable": Invalid argument
It works on an x86 with Debian sid/unstable and Linux 5.10.26-1.
Kind regards,
Paul
[1]: https://seclists.org/oss-sec/2021/q2/12