NAME¶

DESCRIPTION¶

Usage:

Live mode:

spectre-meltdown-checker [options] [--live]

Offline mode: spectre-meltdown-checker [options] [--kernel <kernel_file>] [--config <kernel_config>] [--map <kernel_map_file>]

Modes:

Two modes are available.

First mode is the "live" mode (default), it does its best to find information about the currently running kernel. To run under this mode, just start the script without any option (you can also use --live explicitly)

Second mode is the "offline" mode, where you can inspect a non-running kernel. You'll need to specify the location of the kernel file, config and System.map files:

--kernel kernel_file

specify a (possibly compressed) Linux or BSD kernel file

--config kernel_config

specify a kernel config file (Linux only)

--map kernel_map_file

specify a kernel System.map file (Linux only)

Options:

--no-color

don't use color codes

--verbose, -v

increase verbosity level, possibly several times

--explain

produce an additional human-readable explanation of actions to take to mitigate a vulnerability

--paranoid

require IBPB to deem Variant 2 as mitigated also require SMT disabled + unconditional L1D flush to deem Foreshadow-NG VMM as mitigated also require SMT disabled to deem MDS vulnerabilities mitigated

--no-sysfs

don't use the /sys interface even if present [Linux]

--sysfs-only

only use the /sys interface, don't run our own checks [Linux]

--coreos

special mode for CoreOS (use an ephemeral toolbox to inspect kernel) [Linux]

--arch-prefix PREFIX

specify a prefix for cross-inspecting a kernel of a different arch, for example "aarch64-linux-gnu-", so that invoked tools will be prefixed with this (i.e. aarch64-linux-gnu-objdump)

--batch text

produce machine readable output, this is the default if --batch is specified alone

--batch short

produce only one line with the vulnerabilities separated by spaces

--batch json

produce JSON output formatted for Puppet, Ansible, Chef...

--batch nrpe

produce machine readable output formatted for NRPE

--batch prometheus

produce output for consumption by prometheus-node-exporter

--variant VARIANT

specify which variant you'd like to check, by default all variants are checked VARIANT can be one of 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum can be specified multiple times (e.g. --variant 2 --variant 3)

--cve [cve1,cve2,...]

specify which CVE you'd like to check, by default all supported CVEs are checked

--hw-only

only check for CPU information, don't check for any variant

--no-hw

skip CPU information and checks, if you're inspecting a kernel not to be run on this host

--vmm [auto,yes,no]

override the detection of the presence of a hypervisor (for CVE-2018-3646), default: auto

--update-mcedb

update our local copy of the CPU microcodes versions database (from the awesome MCExtractor project)

--update-builtin-mcedb

same as --update-mcedb but update builtin DB inside the script itself

--dump-mock-data

used to mimick a CPU on an other system, mainly used to help debugging this script

Return codes:

0 (not vulnerable), 2 (vulnerable), 3 (unknown), 255 (error)

IMPORTANT: A false sense of security is worse than no security at all. Please use the --disclaimer option to understand exactly what this script does.

SEE ALSO¶

info Spectre

should give you access to the complete manual.