Re: [PATCH 0/3] bpf: add boot parameters for sysctl knobs
On Mon, May 21, 2018 at 11:58:13AM -0700, Alexei Starovoitov wrote: > On Mon, May 21, 2018 at 02:29:30PM +0200, Eugene Syromiatnikov wrote: > > Hello. > > > > This patch set adds ability to set default values for > > kernel.unprivileged_bpf_disable, net.core.bpf_jit_harden, > > net.core.bpf_jit_kallsyms sysctl knobs as well as option to override > > them via a boot-time kernel parameter. > > Commits log not only should explain 'what' is being done by the patch, > but 'why' as well. Some BPF sysctl knobs affect the loading of BPF programs, and during system boot/init stages these sysctls are not yet configured. A concrete example is systemd, that has implemented loading of BPF programs. Thus, to allow controlling these setting at early boot, this patch set adds the ability to change the default setting of these sysctl knobs as well as option to override them via a boot-time kernel parameter (in order to avoid rebuilding kernel each time a need of changing these defaults arises). The sysctl knobs in question are kernel.unprivileged_bpf_disable, net.core.bpf_jit_harden, and net.core.bpf_jit_kallsyms.
Re: [PATCH 0/3] bpf: add boot parameters for sysctl knobs
On Mon, May 21, 2018 at 02:29:30PM +0200, Eugene Syromiatnikov wrote: > Hello. > > This patch set adds ability to set default values for > kernel.unprivileged_bpf_disable, net.core.bpf_jit_harden, > net.core.bpf_jit_kallsyms sysctl knobs as well as option to override > them via a boot-time kernel parameter. Commits log not only should explain 'what' is being done by the patch, but 'why' as well.
[PATCH 0/3] bpf: add boot parameters for sysctl knobs
Hello. This patch set adds ability to set default values for kernel.unprivileged_bpf_disable, net.core.bpf_jit_harden, net.core.bpf_jit_kallsyms sysctl knobs as well as option to override them via a boot-time kernel parameter. Eugene Syromiatnikov (3): bpf: add ability to configure unprivileged BPF via boot-time parameter bpf: add ability to configure BPF JIT hardening via boot-time parameter bpf: add ability to configure BPF JIT kallsyms export at the boot time Documentation/admin-guide/kernel-parameters.txt | 28 init/Kconfig| 90 + kernel/bpf/core.c | 31 + kernel/bpf/syscall.c| 16 + 4 files changed, 165 insertions(+) -- 2.1.4
