[lkml]   [2019]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v3 0/7] arm64: add system vulnerability sysfs entries

On 01/15/2019 01:50 PM, Stefan Wahren wrote:
> Hi Jeremy,
>> Jeremy Linton <> hat am 10. Januar 2019 um 00:55 geschrieben:
>> Arm64 machines should be displaying a human readable
>> vulnerability status to speculative execution attacks in
>> /sys/devices/system/cpu/vulnerabilities
>> This series enables that behavior by providing the expected
>> functions. Those functions expose the cpu errata and feature
>> states, as well as whether firmware is responding appropriately
>> to display the overall machine status. This means that in a
>> heterogeneous machine we will only claim the machine is mitigated
>> or safe if we are confident all booted cores are safe or
>> mitigated.
> i applied this v3 series and Marc's v2 series.
> Now i'm getting the following on a Raspberry Pi 3 B+ :
> meltdown:Not affected
> spec_store_bypass:Not affected
> spectre_v1:Mitigation: __user pointer sanitization
> So the entries l1tf and spectre_v2 disappeared.

Yes, the l1tf entry should be gone.

I believe there is a problem with the "1/2 advertise.." patch in that
the 'arm64_requested_vuln_attrs |=' line needs to be hoisted to the top
of check_branch_predictor() and the '__spectrev2_safe = false' line
needs to be hoisted 6 lines immediately above "/* Fallback to firmware

That should re-enable the spectre_v2 entry.

 \ /
  Last update: 2019-01-15 22:22    [W:0.290 / U:0.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site