Hi Greg, On 09/03/2022 12:05, gregkh@xxxxxxxxxxxxxxxxxxx wrote: > > The patch below does not apply to the 5.4-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. > ------------------ original commit in Linus's tree ------------------ > > From 58c9a5060cb7cd529d49c93954cdafe81c1d642a Mon Sep 17 00:00:00 2001 > From: James Morse <james.morse@xxxxxxx> > Date: Thu, 3 Mar 2022 16:53:56 +0000 > Subject: [PATCH] arm64: proton-pack: Include unprivileged eBPF status in > Spectre v2 mitigation reporting > > The mitigations for Spectre-BHB are only applied when an exception is > taken from user-space. The mitigation status is reported via the spectre_v2 > sysfs vulnerabilities file. > > When unprivileged eBPF is enabled the mitigation in the exception vectors > can be avoided by an eBPF program. > > When unprivileged eBPF is enabled, print a warning and report vulnerable > via the sysfs vulnerabilities file. > diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c > index d3fbff00993d..6d45c63c6454 100644 > --- a/arch/arm64/kernel/proton-pack.c > +++ b/arch/arm64/kernel/proton-pack.c Yup, this far back the code lives in cpu_errata.c, as it hadn't been centralised. I'll look at what is involved in backporting the whole lot... Thanks, James
