1 files changed, 0 insertions, 235 deletions
diff --git a/runsc/mitigate/cpu.go b/runsc/mitigate/cpu.go
deleted file mode 100644
index 113b98159..000000000
--- a/runsc/mitigate/cpu.go
+++ /dev/null
@@ -1,235 +0,0 @@
-// Copyright 2021 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package mitigate
-
-import (
-	"fmt"
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-const (
-	// constants of coomm
-	meltdown = "cpu_meltdown"
-	l1tf     = "l1tf"
-	mds      = "mds"
-	swapgs   = "swapgs"
-	taa      = "taa"
-)
-
-const (
-	processorKey = "processor"
-	vendorIDKey  = "vendor_id"
-	cpuFamilyKey = "cpu family"
-	modelKey     = "model"
-	coreIDKey    = "core id"
-	bugsKey      = "bugs"
-)
-
-// getCPUSet returns cpu structs from reading /proc/cpuinfo.
-func getCPUSet(data string) ([]*cpu, error) {
-	// Each processor entry should start with the
-	// processor key. Find the beginings of each.
-	r := buildRegex(processorKey, `\d+`)
-	indices := r.FindAllStringIndex(data, -1)
-	if len(indices) < 1 {
-		return nil, fmt.Errorf("no cpus found for: %s", data)
-	}
-
-	// Add the ending index for last entry.
-	indices = append(indices, []int{len(data), -1})
-
-	// Valid cpus are now defined by strings in between
-	// indexes (e.g. data[index[i], index[i+1]]).
-	// There should be len(indicies) - 1 CPUs
-	// since the last index is the end of the string.
-	var cpus = make([]*cpu, 0, len(indices)-1)
-	// Find each string that represents a CPU. These begin "processor".
-	for i := 1; i < len(indices); i++ {
-		start := indices[i-1][0]
-		end := indices[i][0]
-		// Parse the CPU entry, which should be between start/end.
-		c, err := getCPU(data[start:end])
-		if err != nil {
-			return nil, err
-		}
-		cpus = append(cpus, c)
-	}
-	return cpus, nil
-}
-
-// type cpu represents pertinent info about a cpu.
-type cpu struct {
-	processorNumber int64               // the processor number of this CPU.
-	vendorID        string              // the vendorID of CPU (e.g. AuthenticAMD).
-	cpuFamily       int64               // CPU family number (e.g. 6 for CascadeLake/Skylake).
-	model           int64               // CPU model number (e.g. 85 for CascadeLake/Skylake).
-	coreID          int64               // This CPU's core id to match Hyperthread Pairs
-	bugs            map[string]struct{} // map of vulnerabilities parsed from the 'bugs' field.
-}
-
-// getCPU parses a CPU from a single cpu entry from /proc/cpuinfo.
-func getCPU(data string) (*cpu, error) {
-	processor, err := parseProcessor(data)
-	if err != nil {
-		return nil, err
-	}
-
-	vendorID, err := parseVendorID(data)
-	if err != nil {
-		return nil, err
-	}
-
-	cpuFamily, err := parseCPUFamily(data)
-	if err != nil {
-		return nil, err
-	}
-
-	model, err := parseModel(data)
-	if err != nil {
-		return nil, err
-	}
-
-	coreID, err := parseCoreID(data)
-	if err != nil {
-		return nil, err
-	}
-
-	bugs, err := parseBugs(data)
-	if err != nil {
-		return nil, err
-	}
-
-	return &cpu{
-		processorNumber: processor,
-		vendorID:        vendorID,
-		cpuFamily:       cpuFamily,
-		model:           model,
-		coreID:          coreID,
-		bugs:            bugs,
-	}, nil
-}
-
-// List of pertinent side channel vulnerablilites.
-// For mds, see: https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html.
-var vulnerabilities = []string{
-	meltdown,
-	l1tf,
-	mds,
-	swapgs,
-	taa,
-}
-
-// isVulnerable checks if a CPU is vulnerable to pertinent bugs.
-func (c *cpu) isVulnerable() bool {
-	for _, bug := range vulnerabilities {
-		if _, ok := c.bugs[bug]; ok {
-			return true
-		}
-	}
-	return false
-}
-
-// similarTo checks family/model/bugs fields for equality of two
-// processors.
-func (c *cpu) similarTo(other *cpu) bool {
-	if c.vendorID != other.vendorID {
-		return false
-	}
-
-	if other.cpuFamily != c.cpuFamily {
-		return false
-	}
-
-	if other.model != c.model {
-		return false
-	}
-
-	if len(other.bugs) != len(c.bugs) {
-		return false
-	}
-
-	for bug := range c.bugs {
-		if _, ok := other.bugs[bug]; !ok {
-			return false
-		}
-	}
-	return true
-}
-
-// parseProcessor grabs the processor field from /proc/cpuinfo output.
-func parseProcessor(data string) (int64, error) {
-	return parseIntegerResult(data, processorKey)
-}
-
-// parseVendorID grabs the vendor_id field from /proc/cpuinfo output.
-func parseVendorID(data string) (string, error) {
-	return parseRegex(data, vendorIDKey, `[\w\d]+`)
-}
-
-// parseCPUFamily grabs the cpu family field from /proc/cpuinfo output.
-func parseCPUFamily(data string) (int64, error) {
-	return parseIntegerResult(data, cpuFamilyKey)
-}
-
-// parseModel grabs the model field from /proc/cpuinfo output.
-func parseModel(data string) (int64, error) {
-	return parseIntegerResult(data, modelKey)
-}
-
-// parseCoreID parses the core id field.
-func parseCoreID(data string) (int64, error) {
-	return parseIntegerResult(data, coreIDKey)
-}
-
-// parseBugs grabs the bugs field from /proc/cpuinfo output.
-func parseBugs(data string) (map[string]struct{}, error) {
-	result, err := parseRegex(data, bugsKey, `[\d\w\s]*`)
-	if err != nil {
-		return nil, err
-	}
-	bugs := strings.Split(result, " ")
-	ret := make(map[string]struct{}, len(bugs))
-	for _, bug := range bugs {
-		ret[bug] = struct{}{}
-	}
-	return ret, nil
-}
-
-// parseIntegerResult parses fields expecting an integer.
-func parseIntegerResult(data, key string) (int64, error) {
-	result, err := parseRegex(data, key, `\d+`)
-	if err != nil {
-		return 0, err
-	}
-	return strconv.ParseInt(result, 0, 64)
-}
-
-// buildRegex builds a regex for parsing each CPU field.
-func buildRegex(key, match string) *regexp.Regexp {
-	reg := fmt.Sprintf(`(?m)^%s\s*:\s*(.*)$`, key)
-	return regexp.MustCompile(reg)
-}
-
-// parseRegex parses data with key inserted into a standard regex template.
-func parseRegex(data, key, match string) (string, error) {
-	r := buildRegex(key, match)
-	matches := r.FindStringSubmatch(data)
-	if len(matches) < 2 {
-		return "", fmt.Errorf("failed to match key %s: %s", key, data)
-	}
-	return matches[1], nil
-}