Update procfs library (#1640)

Bump procfs to latest release.

Fixes: https://github.com/prometheus/node_exporter/issues/1625
Fixes: https://github.com/prometheus/node_exporter/issues/1634

Signed-off-by: Ben Kochie <superq@gmail.com>

17 files changed, 345 insertions, 64 deletions

diff --git a/go.mod b/go.mod
index d8f9a4e..f67a6b2 100644
--- a/go.mod
+++ b/go.mod
@@ -18,7 +18,7 @@ require (
         github.com/prometheus/client_golang v1.4.1
         github.com/prometheus/client_model v0.2.0
         github.com/prometheus/common v0.9.1
-        github.com/prometheus/procfs v0.0.10
+        github.com/prometheus/procfs v0.0.11
         github.com/siebenmann/go-kstat v0.0.0-20160321171754-d34789b79745
         github.com/soundcloud/go-runit v0.0.0-20150630195641-06ad41a06c4a
         go.uber.org/atomic v1.5.1 // indirect
diff --git a/go.sum b/go.sum
index b161752..b5b43a0 100644
--- a/go.sum
+++ b/go.sum
@@ -275,8 +275,8 @@ github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1/go.mod h1:c3At6R
 github.com/prometheus/procfs v0.0.2 h1:6LJUbpNm42llc4HRCuvApCSWB/WfhuNo9K98Q9sNGfs=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
-github.com/prometheus/procfs v0.0.10 h1:QJQN3jYQhkamO4mhfUWqdDH2asK7ONOI9MTWjyAxNKM=
-github.com/prometheus/procfs v0.0.10/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
+github.com/prometheus/procfs v0.0.11 h1:DhHlBtkHWPYi8O2y31JkK0TF+DGM+51OopZjH/Ia5qI=
+github.com/prometheus/procfs v0.0.11/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
@@ -405,6 +405,7 @@ golang.org/x/sys v0.0.0-20190902133755-9109b7679e13/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191008105621-543471e840be h1:QAcqgptGM8IQBC9K/RC4o+O9YmqEm0diQn9QmZw/0mU=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191220142924-d4481acd189f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200217220822-9197077df867 h1:JoRuNIf+rpHl+VhScRQQvzbHed86tKkqwPMV34T8myw=
diff --git a/vendor/github.com/prometheus/procfs/.golangci.yml b/vendor/github.com/prometheus/procfs/.golangci.yml
index 7c4ce1f..0aa09ed 100644
--- a/vendor/github.com/prometheus/procfs/.golangci.yml
+++ b/vendor/github.com/prometheus/procfs/.golangci.yml
@@ -1,4 +1,4 @@
+---
 linters:
   enable:
-  - staticcheck
-  - govet
+  - golint
diff --git a/vendor/github.com/prometheus/procfs/Makefile.common b/vendor/github.com/prometheus/procfs/Makefile.common
index 066866e..b978dfc 100644
--- a/vendor/github.com/prometheus/procfs/Makefile.common
+++ b/vendor/github.com/prometheus/procfs/Makefile.common
@@ -69,6 +69,15 @@ else
         GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
 endif
 
+GOTEST := $(GO) test
+GOTEST_DIR :=
+ifneq ($(CIRCLE_JOB),)
+ifneq ($(shell which gotestsum),)
+        GOTEST_DIR := test-results
+        GOTEST := gotestsum --junitfile $(GOTEST_DIR)/unit-tests.xml --
+endif
+endif
+
 PROMU_VERSION ?= 0.5.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
 
@@ -142,14 +151,17 @@ else
 endif
 
 .PHONY: common-test-short
-common-test-short:
+common-test-short: $(GOTEST_DIR)
         @echo ">> running short tests"
-        GO111MODULE=$(GO111MODULE) $(GO) test -short $(GOOPTS) $(pkgs)
+        GO111MODULE=$(GO111MODULE) $(GOTEST) -short $(GOOPTS) $(pkgs)
 
 .PHONY: common-test
-common-test:
+common-test: $(GOTEST_DIR)
         @echo ">> running all tests"
-        GO111MODULE=$(GO111MODULE) $(GO) test $(test-flags) $(GOOPTS) $(pkgs)
+        GO111MODULE=$(GO111MODULE) $(GOTEST) $(test-flags) $(GOOPTS) $(pkgs)
+
+$(GOTEST_DIR):
+        @mkdir -p $@
 
 .PHONY: common-format
 common-format:
diff --git a/vendor/github.com/prometheus/procfs/bcache/bcache.go b/vendor/github.com/prometheus/procfs/bcache/bcache.go
index 1db178c..df724ed 100644
--- a/vendor/github.com/prometheus/procfs/bcache/bcache.go
+++ b/vendor/github.com/prometheus/procfs/bcache/bcache.go
@@ -29,7 +29,7 @@ type Stats struct {
 }
 
 // BcacheStats contains statistics tied to a bcache ID.
-type BcacheStats struct {
+type BcacheStats struct { // nolint:golint
         AverageKeySize        uint64
         BtreeCacheSize        uint64
         CacheAvailablePercent uint64
diff --git a/vendor/github.com/prometheus/procfs/bcache/get.go b/vendor/github.com/prometheus/procfs/bcache/get.go
index a8896bd..67fcf8b 100644
--- a/vendor/github.com/prometheus/procfs/bcache/get.go
+++ b/vendor/github.com/prometheus/procfs/bcache/get.go
@@ -51,8 +51,21 @@ func NewFS(mountPoint string) (FS, error) {
         return FS{&fs}, nil
 }
 
-// Stats retrieves bcache runtime statistics for each bcache.
+// Stats is a wrapper around stats()
+// It returns full available statistics
 func (fs FS) Stats() ([]*Stats, error) {
+        return fs.stats(true)
+}
+
+// StatsWithoutPriority is a wrapper around stats().
+// It ignores priority_stats file, because it is expensive to read.
+func (fs FS) StatsWithoutPriority() ([]*Stats, error) {
+        return fs.stats(false)
+}
+
+// stats() retrieves bcache runtime statistics for each bcache.
+// priorityStats flag controls if we need to read priority_stats.
+func (fs FS) stats(priorityStats bool) ([]*Stats, error) {
         matches, err := filepath.Glob(fs.sys.Path("fs/bcache/*-*"))
         if err != nil {
                 return nil, err
@@ -64,7 +77,7 @@ func (fs FS) Stats() ([]*Stats, error) {
                 name := filepath.Base(uuidPath)
 
                 // stats
-                s, err := GetStats(uuidPath)
+                s, err := GetStats(uuidPath, priorityStats)
                 if err != nil {
                         return nil, err
                 }
@@ -251,7 +264,7 @@ func (p *parser) getPriorityStats() PriorityStats {
 }
 
 // GetStats collects from sysfs files data tied to one bcache ID.
-func GetStats(uuidPath string) (*Stats, error) {
+func GetStats(uuidPath string, priorityStats bool) (*Stats, error) {
         var bs Stats
 
         par := parser{uuidPath: uuidPath}
@@ -370,8 +383,10 @@ func GetStats(uuidPath string) (*Stats, error) {
                 cs.MetadataWritten = par.readValue("metadata_written")
                 cs.Written = par.readValue("written")
 
-                ps := par.getPriorityStats()
-                cs.Priority = ps
+                if priorityStats {
+                        ps := par.getPriorityStats()
+                        cs.Priority = ps
+                }
         }
 
         if par.err != nil {
diff --git a/vendor/github.com/prometheus/procfs/fixtures.ttar b/vendor/github.com/prometheus/procfs/fixtures.ttar
index a21ccad..45a7321 100644
--- a/vendor/github.com/prometheus/procfs/fixtures.ttar
+++ b/vendor/github.com/prometheus/procfs/fixtures.ttar
@@ -289,6 +289,19 @@ Max realtime priority     0                    0
 Max realtime timeout      unlimited            unlimited            us
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26232/maps
+Lines: 9
+55680ae1e000-55680ae20000 r--p 00000000 fd:01 47316994                   /bin/cat
+55680ae29000-55680ae2a000 rwxs 0000a000 fd:01 47316994                   /bin/cat
+55680bed6000-55680bef7000 rw-p 00000000 00:00 0                          [heap]
+7fdf964fc000-7fdf973f2000 r--p 00000000 fd:01 17432624                   /usr/lib/locale/locale-archive
+7fdf973f2000-7fdf97417000 r--p 00000000 fd:01 60571062                   /lib/x86_64-linux-gnu/libc-2.29.so
+7ffe9215c000-7ffe9217f000 rw-p 00000000 00:00 0                          [stack]
+7ffe921da000-7ffe921dd000 r--p 00000000 00:00 0                          [vvar]
+7ffe921dd000-7ffe921de000 r-xp 00000000 00:00 0                          [vdso]
+ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/26232/root
 SymlinkTo: /does/not/exist
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -317,6 +330,17 @@ Lines: 8
                 ||     ||
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Directory: fixtures/proc/26234
+Mode: 755
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26234/maps
+Lines: 4
+08048000-08089000 r-xp 00000000 03:01 104219 /bin/tcsh
+08089000-0808c000 rw-p 00041000 03:01 104219 /bin/tcsh
+0808c000-08146000 rwxp 00000000 00:00 0
+40000000-40015000 r-xp 00000000 03:01 61874 /lib/ld-2.3.2.so
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: fixtures/proc/584
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -1529,11 +1553,6 @@ max keysize  : 32
 
 Mode: 444
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Path: fixtures/proc/loadavg
-Lines: 1
-0.02 0.04 0.05 1/497 11947
-Mode: 444
-# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/diskstats
 Lines: 49
    1       0 ram0 0 0 0 0 0 0 0 0 0 0 0
@@ -1620,6 +1639,11 @@ xpc 399724544 92823103 86219234
 debug 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/loadavg
+Lines: 1
+0.02 0.04 0.05 1/497 11947
+Mode: 444
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/mdstat
 Lines: 56
 Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
@@ -1827,8 +1851,14 @@ FRAG6: inuse 0 memory 0
 Mode: 444
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/net/softnet_stat
-Lines: 1
+Lines: 2
 00015c73 00020e76 F0000769 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
+01663fb2 00000000 000109a4 00000000 00000000 00000000 00000000 00000000 00000000
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/net/softnet_stat.broken
+Lines: 1
+00015c73 00020e76 F0000769 00000000
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/net/udp
diff --git a/vendor/github.com/prometheus/procfs/go.mod b/vendor/github.com/prometheus/procfs/go.mod
index 0e04e5d..ded4825 100644
--- a/vendor/github.com/prometheus/procfs/go.mod
+++ b/vendor/github.com/prometheus/procfs/go.mod
@@ -5,4 +5,5 @@ go 1.12
 require (
         github.com/google/go-cmp v0.3.1
         golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+        golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e
 )
diff --git a/vendor/github.com/prometheus/procfs/go.sum b/vendor/github.com/prometheus/procfs/go.sum
index 33b824b..54b5f33 100644
--- a/vendor/github.com/prometheus/procfs/go.sum
+++ b/vendor/github.com/prometheus/procfs/go.sum
@@ -2,3 +2,5 @@ github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e h1:LwyF2AFISC9nVbS6MgzsaQNSUsRXI49GS+YQ5KX/QH0=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vendor/github.com/prometheus/procfs/mountinfo.go b/vendor/github.com/prometheus/procfs/mountinfo.go
index bb01bb5..9471136 100644
--- a/vendor/github.com/prometheus/procfs/mountinfo.go
+++ b/vendor/github.com/prometheus/procfs/mountinfo.go
@@ -29,10 +29,10 @@ import (
 // is described in the following man page.
 // http://man7.org/linux/man-pages/man5/proc.5.html
 type MountInfo struct {
-        // Unique Id for the mount
-        MountId int
-        // The Id of the parent mount
-        ParentId int
+        // Unique ID for the mount
+        MountID int
+        // The ID of the parent mount
+        ParentID int
         // The value of `st_dev` for the files on this FS
         MajorMinorVer string
         // The pathname of the directory in the FS that forms
@@ -96,11 +96,11 @@ func parseMountInfoString(mountString string) (*MountInfo, error) {
                 SuperOptions:   mountOptionsParser(mountInfo[mountInfoLength-1]),
         }
 
-        mount.MountId, err = strconv.Atoi(mountInfo[0])
+        mount.MountID, err = strconv.Atoi(mountInfo[0])
         if err != nil {
                 return nil, fmt.Errorf("failed to parse mount ID")
         }
-        mount.ParentId, err = strconv.Atoi(mountInfo[1])
+        mount.ParentID, err = strconv.Atoi(mountInfo[1])
         if err != nil {
                 return nil, fmt.Errorf("failed to parse parent ID")
         }
diff --git a/vendor/github.com/prometheus/procfs/net_softnet.go b/vendor/github.com/prometheus/procfs/net_softnet.go
index 2a65cf1..db5debd 100644
--- a/vendor/github.com/prometheus/procfs/net_softnet.go
+++ b/vendor/github.com/prometheus/procfs/net_softnet.go
@@ -25,7 +25,9 @@ import (
 )
 
 // For the proc file format details,
-// see https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
+// See:
+// * Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2343
+// * Linux 4.17 https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
 // and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
 
 // SoftnetStat contains a single row of data from /proc/net/softnet_stat
@@ -38,9 +40,11 @@ type SoftnetStat struct {
         TimeSqueezed uint32
 }
 
+var softNetProcFile = "net/softnet_stat"
+
 // NetSoftnetStat reads data from /proc/net/softnet_stat.
 func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
-        b, err := util.ReadFileNoStat(fs.proc.Path("net/softnet_stat"))
+        b, err := util.ReadFileNoStat(fs.proc.Path(softNetProcFile))
         if err != nil {
                 return nil, err
         }
@@ -54,7 +58,7 @@ func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
 }
 
 func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
-        const expectedColumns = 11
+        const minColumns = 9
 
         s := bufio.NewScanner(r)
 
@@ -63,8 +67,8 @@ func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
                 columns := strings.Fields(s.Text())
                 width := len(columns)
 
-                if width != 11 {
-                        return nil, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedColumns)
+                if width < minColumns {
+                        return nil, fmt.Errorf("%d columns were detected, but at least %d were expected", width, minColumns)
                 }
 
                 // We only parse the first three columns at the moment.
diff --git a/vendor/github.com/prometheus/procfs/proc_fdinfo.go b/vendor/github.com/prometheus/procfs/proc_fdinfo.go
index 4e7597f..0c9c402 100644
--- a/vendor/github.com/prometheus/procfs/proc_fdinfo.go
+++ b/vendor/github.com/prometheus/procfs/proc_fdinfo.go
@@ -16,6 +16,7 @@ package procfs
 import (
         "bufio"
         "bytes"
+        "errors"
         "regexp"
 
         "github.com/prometheus/procfs/internal/util"
@@ -23,10 +24,11 @@ import (
 
 // Regexp variables
 var (
-        rPos     = regexp.MustCompile(`^pos:\s+(\d+)$`)
-        rFlags   = regexp.MustCompile(`^flags:\s+(\d+)$`)
-        rMntID   = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
-        rInotify = regexp.MustCompile(`^inotify`)
+        rPos          = regexp.MustCompile(`^pos:\s+(\d+)$`)
+        rFlags        = regexp.MustCompile(`^flags:\s+(\d+)$`)
+        rMntID        = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
+        rInotify      = regexp.MustCompile(`^inotify`)
+        rInotifyParts = regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)(?:\s+mask:([0-9a-f]+))?`)
 )
 
 // ProcFDInfo contains represents file descriptor information.
@@ -96,15 +98,21 @@ type InotifyInfo struct {
 
 // InotifyInfo constructor. Only available on kernel 3.8+.
 func parseInotifyInfo(line string) (*InotifyInfo, error) {
-        r := regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)\s+mask:([0-9a-f]+)`)
-        m := r.FindStringSubmatch(line)
-        i := &InotifyInfo{
-                WD:   m[1],
-                Ino:  m[2],
-                Sdev: m[3],
-                Mask: m[4],
+        m := rInotifyParts.FindStringSubmatch(line)
+        if len(m) >= 4 {
+                var mask string
+                if len(m) == 5 {
+                        mask = m[4]
+                }
+                i := &InotifyInfo{
+                        WD:   m[1],
+                        Ino:  m[2],
+                        Sdev: m[3],
+                        Mask: mask,
+                }
+                return i, nil
         }
-        return i, nil
+        return nil, errors.New("invalid inode entry: " + line)
 }
 
 // ProcFDInfos represents a list of ProcFDInfo structs.
diff --git a/vendor/github.com/prometheus/procfs/proc_maps.go b/vendor/github.com/prometheus/procfs/proc_maps.go
new file mode 100644
index 0000000..28d5c6e
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/proc_maps.go
@@ -0,0 +1,208 @@
+// Copyright 2019 The Prometheus 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.
+
+// +build !windows
+
+package procfs
+
+import (
+        "bufio"
+        "fmt"
+        "os"
+        "strconv"
+        "strings"
+
+        "golang.org/x/sys/unix"
+)
+
+type ProcMapPermissions struct {
+        // mapping has the [R]ead flag set
+        Read bool
+        // mapping has the [W]rite flag set
+        Write bool
+        // mapping has the [X]ecutable flag set
+        Execute bool
+        // mapping has the [S]hared flag set
+        Shared bool
+        // mapping is marked as [P]rivate (copy on write)
+        Private bool
+}
+
+// ProcMap contains the process memory-mappings of the process,
+// read from /proc/[pid]/maps
+type ProcMap struct {
+        // The start address of current mapping.
+        StartAddr uintptr
+        // The end address of the current mapping
+        EndAddr uintptr
+        // The permissions for this mapping
+        Perms *ProcMapPermissions
+        // The current offset into the file/fd (e.g., shared libs)
+        Offset int64
+        // Device owner of this mapping (major:minor) in Mkdev format.
+        Dev uint64
+        // The inode of the device above
+        Inode uint64
+        // The file or psuedofile (or empty==anonymous)
+        Pathname string
+}
+
+// parseDevice parses the device token of a line and converts it to a dev_t
+// (mkdev) like structure.
+func parseDevice(s string) (uint64, error) {
+        toks := strings.Split(s, ":")
+        if len(toks) < 2 {
+                return 0, fmt.Errorf("unexpected number of fields")
+        }
+
+        major, err := strconv.ParseUint(toks[0], 16, 0)
+        if err != nil {
+                return 0, err
+        }
+
+        minor, err := strconv.ParseUint(toks[1], 16, 0)
+        if err != nil {
+                return 0, err
+        }
+
+        return unix.Mkdev(uint32(major), uint32(minor)), nil
+}
+
+// parseAddress just converts a hex-string to a uintptr
+func parseAddress(s string) (uintptr, error) {
+        a, err := strconv.ParseUint(s, 16, 0)
+        if err != nil {
+                return 0, err
+        }
+
+        return uintptr(a), nil
+}
+
+// parseAddresses parses the start-end address
+func parseAddresses(s string) (uintptr, uintptr, error) {
+        toks := strings.Split(s, "-")
+        if len(toks) < 2 {
+                return 0, 0, fmt.Errorf("invalid address")
+        }
+
+        saddr, err := parseAddress(toks[0])
+        if err != nil {
+                return 0, 0, err
+        }
+
+        eaddr, err := parseAddress(toks[1])
+        if err != nil {
+                return 0, 0, err
+        }
+
+        return saddr, eaddr, nil
+}
+
+// parsePermissions parses a token and returns any that are set.
+func parsePermissions(s string) (*ProcMapPermissions, error) {
+        if len(s) < 4 {
+                return nil, fmt.Errorf("invalid permissions token")
+        }
+
+        perms := ProcMapPermissions{}
+        for _, ch := range s {
+                switch ch {
+                case 'r':
+                        perms.Read = true
+                case 'w':
+                        perms.Write = true
+                case 'x':
+                        perms.Execute = true
+                case 'p':
+                        perms.Private = true
+                case 's':
+                        perms.Shared = true
+                }
+        }
+
+        return &perms, nil
+}
+
+// parseProcMap will attempt to parse a single line within a proc/[pid]/maps
+// buffer.
+func parseProcMap(text string) (*ProcMap, error) {
+        fields := strings.Fields(text)
+        if len(fields) < 5 {
+                return nil, fmt.Errorf("truncated procmap entry")
+        }
+
+        saddr, eaddr, err := parseAddresses(fields[0])
+        if err != nil {
+                return nil, err
+        }
+
+        perms, err := parsePermissions(fields[1])
+        if err != nil {
+                return nil, err
+        }
+
+        offset, err := strconv.ParseInt(fields[2], 16, 0)
+        if err != nil {
+                return nil, err
+        }
+
+        device, err := parseDevice(fields[3])
+        if err != nil {
+                return nil, err
+        }
+
+        inode, err := strconv.ParseUint(fields[4], 10, 0)
+        if err != nil {
+                return nil, err
+        }
+
+        pathname := ""
+
+        if len(fields) >= 5 {
+                pathname = strings.Join(fields[5:], " ")
+        }
+
+        return &ProcMap{
+                StartAddr: saddr,
+                EndAddr:   eaddr,
+                Perms:     perms,
+                Offset:    offset,
+                Dev:       device,
+                Inode:     inode,
+                Pathname:  pathname,
+        }, nil
+}
+
+// ProcMaps reads from /proc/[pid]/maps to get the memory-mappings of the
+// process.
+func (p Proc) ProcMaps() ([]*ProcMap, error) {
+        file, err := os.Open(p.path("maps"))
+        if err != nil {
+                return nil, err
+        }
+        defer file.Close()
+
+        maps := []*ProcMap{}
+        scan := bufio.NewScanner(file)
+
+        for scan.Scan() {
+                m, err := parseProcMap(scan.Text())
+                if err != nil {
+                        return nil, err
+                }
+
+                maps = append(maps, m)
+        }
+
+        return maps, nil
+}
diff --git a/vendor/github.com/prometheus/procfs/proc_status.go b/vendor/github.com/prometheus/procfs/proc_status.go
index 17b4516..c58346d 100644
--- a/vendor/github.com/prometheus/procfs/proc_status.go
+++ b/vendor/github.com/prometheus/procfs/proc_status.go
@@ -33,37 +33,37 @@ type ProcStatus struct {
         TGID int
 
         // Peak virtual memory size.
-        VmPeak uint64
+        VmPeak uint64 // nolint:golint
         // Virtual memory size.
-        VmSize uint64
+        VmSize uint64 // nolint:golint
         // Locked memory size.
-        VmLck uint64
+        VmLck uint64 // nolint:golint
         // Pinned memory size.
-        VmPin uint64
+        VmPin uint64 // nolint:golint
         // Peak resident set size.
-        VmHWM uint64
+        VmHWM uint64 // nolint:golint
         // Resident set size (sum of RssAnnon RssFile and RssShmem).
-        VmRSS uint64
+        VmRSS uint64 // nolint:golint
         // Size of resident anonymous memory.
-        RssAnon uint64
+        RssAnon uint64 // nolint:golint
         // Size of resident file mappings.
-        RssFile uint64
+        RssFile uint64 // nolint:golint
         // Size of resident shared memory.
-        RssShmem uint64
+        RssShmem uint64 // nolint:golint
         // Size of data segments.
-        VmData uint64
+        VmData uint64 // nolint:golint
         // Size of stack segments.
-        VmStk uint64
+        VmStk uint64 // nolint:golint
         // Size of text segments.
-        VmExe uint64
+        VmExe uint64 // nolint:golint
         // Shared library code size.
-        VmLib uint64
+        VmLib uint64 // nolint:golint
         // Page table entries size.
-        VmPTE uint64
+        VmPTE uint64 // nolint:golint
         // Size of second-level page tables.
-        VmPMD uint64
+        VmPMD uint64 // nolint:golint
         // Swapped-out virtual memory size by anonymous private.
-        VmSwap uint64
+        VmSwap uint64 // nolint:golint
         // Size of hugetlb memory portions
         HugetlbPages uint64
 
diff --git a/vendor/github.com/prometheus/procfs/sysfs/class_infiniband.go b/vendor/github.com/prometheus/procfs/sysfs/class_infiniband.go
index 0eab1eb..be900fa 100644
--- a/vendor/github.com/prometheus/procfs/sysfs/class_infiniband.go
+++ b/vendor/github.com/prometheus/procfs/sysfs/class_infiniband.go
@@ -251,7 +251,7 @@ func parseInfiniBandCounters(portPath string) (*InfiniBandCounters, error) {
                 name := filepath.Join(path, f.Name())
                 value, err := util.SysReadFile(name)
                 if err != nil {
-                        if os.IsNotExist(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
+                        if os.IsNotExist(err) || os.IsPermission(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
                                 continue
                         }
                         return nil, fmt.Errorf("failed to read file %q: %v", name, err)
@@ -334,7 +334,7 @@ func parseInfiniBandCounters(portPath string) (*InfiniBandCounters, error) {
                 name := filepath.Join(path, f.Name())
                 value, err := util.SysReadFile(name)
                 if err != nil {
-                        if os.IsNotExist(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
+                        if os.IsNotExist(err) || os.IsPermission(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
                                 continue
                         }
                         return nil, fmt.Errorf("failed to read file %q: %v", name, err)
diff --git a/vendor/github.com/prometheus/procfs/sysfs/net_class.go b/vendor/github.com/prometheus/procfs/sysfs/net_class.go
index 9aa6b57..8f64987 100644
--- a/vendor/github.com/prometheus/procfs/sysfs/net_class.go
+++ b/vendor/github.com/prometheus/procfs/sysfs/net_class.go
@@ -119,7 +119,7 @@ func (nc NetClass) parseNetClassIface(devicePath string) (*NetClassIface, error)
                 name := filepath.Join(devicePath, f.Name())
                 value, err := util.SysReadFile(name)
                 if err != nil {
-                        if os.IsNotExist(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
+                        if os.IsNotExist(err) || os.IsPermission(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
                                 continue
                         }
                         return nil, fmt.Errorf("failed to read file %q: %v", name, err)
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 9b77b1a..033b85a 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -59,7 +59,7 @@ github.com/prometheus/common/model
 github.com/prometheus/common/promlog
 github.com/prometheus/common/promlog/flag
 github.com/prometheus/common/version
-# github.com/prometheus/procfs v0.0.10
+# github.com/prometheus/procfs v0.0.11
 github.com/prometheus/procfs
 github.com/prometheus/procfs/bcache
 github.com/prometheus/procfs/btrfs