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From: Adam Carter <adamcarter3@gmail.com>
Date: Fri, 5 Jan 2018 12:31:52 +1100
Message-ID: <CAC=wYCHeLe-2EcqyGSQke7rpgiSpLcCONp0Z3uLzcTkJBzyADw@mail.gmail.com>
Subject: Re: [gentoo-user] Re: Expect a ~15% average slowdown if you use an
Intel processor
To: gentoo-user@lists.gentoo.org
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>
> The settings relevant to Spectre are:
> CONFIG_BPF_JIT - this being set to y is enough to make Intel
> processors vulnerable to variant 1/2. This being set to y is
> necessary, but not sufficient, for making AMD vulnerable to variant 1.
> net.core.bpf_jit_enable - this being set to 1 along with the config
> option being set is sufficient to make AMD vulnerable to variant 1.
> This setting has no effect on making Intel vulnerable to variant 1 or
> 2. I suspect this sysctl item won't appear unless it is loaded into
> the kernel in the first place.
Thanks for the clarification. I checked my three systemd systems and all
are;
# CONFIG_BPF_JIT is not set
systemd ebuild is looking for;
$ grep -i bpf /usr/portage/sys-apps/systemd/systemd-2*
/usr/portage/sys-apps/systemd/systemd-235-r1.ebuild: kernel_is -ge 4
10 && CONFIG_CHECK+=" ~CGROUP_BPF"
/usr/portage/sys-apps/systemd/systemd-236-r4.ebuild: kernel_is -ge 4
10 && CONFIG_CHECK+=" ~CGROUP_BPF"
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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><span class=3D"gmail-"></span><div class=3D"gmail_extra"><=
div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
>The settings relevant to Spectre are:<br>
CONFIG_BPF_JIT - this being set to y is enough to make Intel<br>
processors vulnerable to variant 1/2.=C2=A0 This being set to y is<br>
necessary, but not sufficient, for making AMD vulnerable to variant 1.<br>
net.core.bpf_jit_enable - this being set to 1 along with the config<br>
option being set is sufficient to make AMD vulnerable to variant 1.<br>
This setting has no effect on making Intel vulnerable to variant 1 or<br>
2.=C2=A0 I suspect this sysctl item won't appear unless it is loaded in=
to<br>
the kernel in the first place.</blockquote><div><br></div><div>Thanks for t=
he clarification. I checked my three systemd systems and all are;</div><div=
> # CONFIG_BPF_JIT is not set</div><div><br></div><div>systemd ebuild is lo=
oking for;<br></div><div></div><div>$ grep -i bpf /usr/portage/sys-apps/sys=
temd/systemd-2*<br>/usr/portage/sys-apps/systemd/systemd-235-r1.ebuild:=C2=
=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 kernel_is -ge 4 10 && CONFIG_CHE=
CK+=3D" ~CGROUP_BPF"<br>/usr/portage/sys-apps/systemd/systemd-236=
-r4.ebuild:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 kernel_is -ge 4 10 &&a=
mp; CONFIG_CHECK+=3D" ~CGROUP_BPF"<br><br></div></div><br></div><=
/div>
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