From cea6b8b76a78d8a27d982588dce154a31387960f Mon Sep 17 00:00:00 2001 From: Ophestra Date: Thu, 20 Mar 2025 19:04:10 +0900 Subject: [PATCH] sandbox/vfs: implement proc_pid_mountinfo(5) parser Test cases are mostly taken from util-linux. This implementation is more correct and slightly faster than the one found in github:kubernetes/utils. Signed-off-by: Ophestra --- sandbox/vfs/mountinfo.go | 141 ++++++++++++++++++++++ sandbox/vfs/mountinfo_test.go | 213 ++++++++++++++++++++++++++++++++++ 2 files changed, 354 insertions(+) create mode 100644 sandbox/vfs/mountinfo.go create mode 100644 sandbox/vfs/mountinfo_test.go diff --git a/sandbox/vfs/mountinfo.go b/sandbox/vfs/mountinfo.go new file mode 100644 index 0000000..b9e6f45 --- /dev/null +++ b/sandbox/vfs/mountinfo.go @@ -0,0 +1,141 @@ +package vfs + +import ( + "bufio" + "errors" + "fmt" + "io" + "strconv" + "strings" +) + +var ( + ErrMountInfoFields = errors.New("unexpected field count") + ErrMountInfoEmpty = errors.New("unexpected empty field") + ErrMountInfoDevno = errors.New("bad maj:min field") + ErrMountInfoSep = errors.New("bad optional fields separator") +) + +type ( + // MountInfo represents a /proc/pid/mountinfo document. + MountInfo struct { + Next *MountInfo + MountInfoEntry + } + + // MountInfoEntry represents a line in /proc/pid/mountinfo. + MountInfoEntry struct { + // mount ID: a unique ID for the mount (may be reused after umount(2)). + ID int `json:"id"` + // parent ID: the ID of the parent mount (or of self for the root of this mount namespace's mount tree). + Parent int `json:"parent"` + // major:minor: the value of st_dev for files on this filesystem (see stat(2)). + Devno DevT `json:"devno"` + // root: the pathname of the directory in the filesystem which forms the root of this mount. + Root string `json:"root"` + // mount point: the pathname of the mount point relative to the process's root directory. + Target string `json:"target"` + // mount options: per-mount options (see mount(2)). + VfsOptstr string `json:"vfs_optstr"` + // optional fields: zero or more fields of the form "tag[:value]"; see below. + // separator: the end of the optional fields is marked by a single hyphen. + OptFields []string `json:"opt_fields"` + // filesystem type: the filesystem type in the form "type[.subtype]". + FsType string `json:"fstype"` + // mount source: filesystem-specific information or "none". + Source string `json:"source"` + // super options: per-superblock options (see mount(2)). + FsOptstr string `json:"fs_optstr"` + } + + DevT [2]int +) + +// ParseMountInfo parses a mountinfo file according to proc_pid_mountinfo(5). +func ParseMountInfo(r io.Reader) (*MountInfo, error) { + var m, cur *MountInfo + s := bufio.NewScanner(r) + for s.Scan() { + if cur == nil { + m = new(MountInfo) + cur = m + } else { + cur.Next = new(MountInfo) + cur = cur.Next + } + + // prevent proceeding with misaligned fields due to optional fields + f := strings.Split(s.Text(), " ") + if len(f) < 10 { + return nil, ErrMountInfoFields + } + + // 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue + // (1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11) + + // (1) id + if id, err := strconv.Atoi(f[0]); err != nil { // 0 + return nil, err + } else { + cur.ID = id + } + + // (2) parent + if parent, err := strconv.Atoi(f[1]); err != nil { // 1 + return nil, err + } else { + cur.Parent = parent + } + + // (3) maj:min + if n, err := fmt.Sscanf(f[2], "%d:%d", &cur.Devno[0], &cur.Devno[1]); err != nil { + return nil, err + } else if n != 2 { + // unreachable + return nil, ErrMountInfoDevno + } + + // (4) mountroot + cur.Root = f[3] + if cur.Root == "" { + return nil, ErrMountInfoEmpty + } + + // (5) target + cur.Target = f[4] + if cur.Target == "" { + return nil, ErrMountInfoEmpty + } + + // (6) vfs options (fs-independent) + cur.VfsOptstr = f[5] + if cur.VfsOptstr == "" { + return nil, ErrMountInfoEmpty + } + + // (7) optional fields, terminated by " - " + i := len(f) - 4 + cur.OptFields = f[6:i] + + // (8) optional fields end marker + if f[i] != "-" { + return nil, ErrMountInfoSep + } + i++ + + // (9) FS type + cur.FsType = f[i] + if cur.FsType == "" { + return nil, ErrMountInfoEmpty + } + i++ + + // (10) source -- maybe empty string + cur.Source = f[i] + i++ + + // (11) fs options (fs specific) + cur.FsOptstr = f[i] + } + return m, s.Err() +} diff --git a/sandbox/vfs/mountinfo_test.go b/sandbox/vfs/mountinfo_test.go new file mode 100644 index 0000000..8d1c2e4 --- /dev/null +++ b/sandbox/vfs/mountinfo_test.go @@ -0,0 +1,213 @@ +package vfs_test + +import ( + "errors" + "reflect" + "strconv" + "strings" + "testing" + + "git.gensokyo.uk/security/fortify/sandbox/vfs" +) + +func TestParseMountInfo(t *testing.T) { + testCases := []struct { + name string + sample string + wantErr error + wantError string + want []vfs.MountInfoEntry + }{ + {"count", sampleMountinfoShort + ` +21 20 0:53/ /mnt/test rw,relatime - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoFields, "", nil}, + + {"sep", sampleMountinfoShort + ` +21 20 0:53 / /mnt/test rw,relatime shared:212 _ tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoSep, "", nil}, + + {"id", sampleMountinfoShort + ` +id 20 0:53 / /mnt/test rw,relatime shared:212 - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, strconv.ErrSyntax, "", nil}, + + {"parent", sampleMountinfoShort + ` +21 parent 0:53 / /mnt/test rw,relatime shared:212 - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, strconv.ErrSyntax, "", nil}, + + {"devno", sampleMountinfoShort + ` +21 20 053 / /mnt/test rw,relatime shared:212 - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, nil, "unexpected EOF", nil}, + + {"maj", sampleMountinfoShort + ` +21 20 maj:53 / /mnt/test rw,relatime shared:212 - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, nil, "expected integer", nil}, + + {"min", sampleMountinfoShort + ` +21 20 0:min / /mnt/test rw,relatime shared:212 - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, nil, "expected integer", nil}, + + {"mountroot", sampleMountinfoShort + ` +21 20 0:53 /mnt/test rw,relatime - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoEmpty, "", nil}, + + {"target", sampleMountinfoShort + ` +21 20 0:53 / rw,relatime - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoEmpty, "", nil}, + + {"vfs options", sampleMountinfoShort + ` +21 20 0:53 / /mnt/test - tmpfs rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoEmpty, "", nil}, + + {"FS type", sampleMountinfoShort + ` +21 20 0:53 / /mnt/test rw,relatime - rw +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755`, vfs.ErrMountInfoEmpty, "", nil}, + + {"base", sampleMountinfoShort, nil, "", []vfs.MountInfoEntry{ + {15, 20, dev(0, 3), "/", "/proc", "rw,relatime", opt(), "proc", "/proc", "rw"}, + {16, 20, dev(0, 15), "/", "/sys", "rw,relatime", opt(), "sysfs", "/sys", "rw"}, + {17, 20, dev(0, 5), "/", "/dev", "rw,relatime", opt(), "devtmpfs", "udev", "rw,size=1983516k,nr_inodes=495879,mode=755"}, + {18, 17, dev(0, 10), "/", "/dev/pts", "rw,relatime", opt(), "devpts", "devpts", "rw,gid=5,mode=620,ptmxmode=000"}, + {19, 17, dev(0, 16), "/", "/dev/shm", "rw,relatime", opt(), "tmpfs", "tmpfs", "rw"}, + {20, 1, dev(8, 4), "/", "/", "rw,noatime", opt(), "ext3", "/dev/sda4", "rw,errors=continue,user_xattr,acl,barrier=0,data=ordered"}, + }}, + + {"sample", sampleMountinfo, nil, "", []vfs.MountInfoEntry{ + {15, 20, dev(0, 3), "/", "/proc", "rw,relatime", opt(), "proc", "/proc", "rw"}, + {16, 20, dev(0, 15), "/", "/sys", "rw,relatime", opt(), "sysfs", "/sys", "rw"}, + {17, 20, dev(0, 5), "/", "/dev", "rw,relatime", opt(), "devtmpfs", "udev", "rw,size=1983516k,nr_inodes=495879,mode=755"}, + {18, 17, dev(0, 10), "/", "/dev/pts", "rw,relatime", opt(), "devpts", "devpts", "rw,gid=5,mode=620,ptmxmode=000"}, + {19, 17, dev(0, 16), "/", "/dev/shm", "rw,relatime", opt(), "tmpfs", "tmpfs", "rw"}, + {20, 1, dev(8, 4), "/", "/", "rw,noatime", opt(), "ext3", "/dev/sda4", "rw,errors=continue,user_xattr,acl,barrier=0,data=ordered"}, + {21, 16, dev(0, 17), "/", "/sys/fs/cgroup", "rw,nosuid,nodev,noexec,relatime", opt(), "tmpfs", "tmpfs", "rw,mode=755"}, + {22, 21, dev(0, 18), "/", "/sys/fs/cgroup/systemd", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd"}, + {23, 21, dev(0, 19), "/", "/sys/fs/cgroup/cpuset", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,cpuset"}, + {24, 21, dev(0, 20), "/", "/sys/fs/cgroup/ns", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,ns"}, + {25, 21, dev(0, 21), "/", "/sys/fs/cgroup/cpu", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,cpu"}, + {26, 21, dev(0, 22), "/", "/sys/fs/cgroup/cpuacct", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,cpuacct"}, + {27, 21, dev(0, 23), "/", "/sys/fs/cgroup/memory", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,memory"}, + {28, 21, dev(0, 24), "/", "/sys/fs/cgroup/devices", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,devices"}, + {29, 21, dev(0, 25), "/", "/sys/fs/cgroup/freezer", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,freezer"}, + {30, 21, dev(0, 26), "/", "/sys/fs/cgroup/net_cls", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,net_cls"}, + {31, 21, dev(0, 27), "/", "/sys/fs/cgroup/blkio", "rw,nosuid,nodev,noexec,relatime", opt(), "cgroup", "cgroup", "rw,blkio"}, + {32, 16, dev(0, 28), "/", "/sys/kernel/security", "rw,relatime", opt(), "autofs", "systemd-1", "rw,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct"}, + {33, 17, dev(0, 29), "/", "/dev/hugepages", "rw,relatime", opt(), "autofs", "systemd-1", "rw,fd=23,pgrp=1,timeout=300,minproto=5,maxproto=5,direct"}, + {34, 16, dev(0, 30), "/", "/sys/kernel/debug", "rw,relatime", opt(), "autofs", "systemd-1", "rw,fd=24,pgrp=1,timeout=300,minproto=5,maxproto=5,direct"}, + {35, 15, dev(0, 31), "/", "/proc/sys/fs/binfmt_misc", "rw,relatime", opt(), "autofs", "systemd-1", "rw,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct"}, + {36, 17, dev(0, 32), "/", "/dev/mqueue", "rw,relatime", opt(), "autofs", "systemd-1", "rw,fd=26,pgrp=1,timeout=300,minproto=5,maxproto=5,direct"}, + {37, 15, dev(0, 14), "/", "/proc/bus/usb", "rw,relatime", opt(), "usbfs", "/proc/bus/usb", "rw"}, + {38, 33, dev(0, 33), "/", "/dev/hugepages", "rw,relatime", opt(), "hugetlbfs", "hugetlbfs", "rw"}, + {39, 36, dev(0, 12), "/", "/dev/mqueue", "rw,relatime", opt(), "mqueue", "mqueue", "rw"}, + {40, 20, dev(8, 6), "/", "/boot", "rw,noatime", opt(), "ext3", "/dev/sda6", "rw,errors=continue,barrier=0,data=ordered"}, + {41, 20, dev(253, 0), "/", "/home/kzak", "rw,noatime", opt(), "ext4", "/dev/mapper/kzak-home", "rw,barrier=1,data=ordered"}, + {42, 35, dev(0, 34), "/", "/proc/sys/fs/binfmt_misc", "rw,relatime", opt(), "binfmt_misc", "none", "rw"}, + {43, 16, dev(0, 35), "/", "/sys/fs/fuse/connections", "rw,relatime", opt(), "fusectl", "fusectl", "rw"}, + {44, 41, dev(0, 36), "/", "/home/kzak/.gvfs", "rw,nosuid,nodev,relatime", opt(), "fuse.gvfs-fuse-daemon", "gvfs-fuse-daemon", "rw,user_id=500,group_id=500"}, + {45, 20, dev(0, 37), "/", "/var/lib/nfs/rpc_pipefs", "rw,relatime", opt(), "rpc_pipefs", "sunrpc", "rw"}, + {47, 20, dev(0, 38), "/", "/mnt/sounds", "rw,relatime", opt(), "cifs", "//foo.home/bar/", "rw,unc=\\\\foo.home\\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344"}, + {49, 20, dev(0, 56), "/", "/mnt/test/foobar", "rw,relatime", opt("shared:323"), "tmpfs", "tmpfs", "rw"}, + }}, + + {"sample nosrc", sampleMountinfoNoSrc, nil, "", []vfs.MountInfoEntry{ + {15, 20, dev(0, 3), "/", "/proc", "rw,relatime", opt(), "proc", "/proc", "rw"}, + {16, 20, dev(0, 15), "/", "/sys", "rw,relatime", opt(), "sysfs", "/sys", "rw"}, + {17, 20, dev(0, 5), "/", "/dev", "rw,relatime", opt(), "devtmpfs", "udev", "rw,size=1983516k,nr_inodes=495879,mode=755"}, + {18, 17, dev(0, 10), "/", "/dev/pts", "rw,relatime", opt(), "devpts", "devpts", "rw,gid=5,mode=620,ptmxmode=000"}, + {19, 17, dev(0, 16), "/", "/dev/shm", "rw,relatime", opt(), "tmpfs", "tmpfs", "rw"}, + {20, 1, dev(8, 4), "/", "/", "rw,noatime", opt(), "ext3", "/dev/sda4", "rw,errors=continue,user_xattr,acl,barrier=0,data=ordered"}, + {21, 20, dev(0, 53), "/", "/mnt/test", "rw,relatime", opt("shared:212"), "tmpfs", "", "rw"}, + }}, + } + + for _, tc := range testCases { + t.Run(tc.name, func(t *testing.T) { + got, err := vfs.ParseMountInfo(strings.NewReader(tc.sample)) + if !errors.Is(err, tc.wantErr) { + if tc.wantError == "" { + t.Errorf("ParseMountInfo: error = %v, wantErr %v", + err, tc.wantErr) + } else if err != nil && err.Error() != tc.wantError { + t.Errorf("ParseMountInfo: error = %q, wantError %q", + err, tc.wantError) + } + } + + i := 0 + for cur := got; cur != nil; cur = cur.Next { + if i == len(tc.want) { + t.Errorf("ParseMountInfo: got more than %d entries", len(tc.want)) + break + } + + if !reflect.DeepEqual(cur.MountInfoEntry, tc.want[i]) { + t.Errorf("ParseMountInfo: entry %d\ngot: %#v\nwant: %#v", + i, cur.MountInfoEntry, tc.want[i]) + } + + i++ + } + + if i != len(tc.want) { + t.Errorf("ParseMountInfo: got %d entries, want %d", i, len(tc.want)) + } + }) + } +} + +func dev(maj, min int) vfs.DevT { return vfs.DevT{maj, min} } +func opt(field ...string) []string { + if field == nil { + return []string{} + } + return field +} + +const ( + sampleMountinfoShort = `15 20 0:3 / /proc rw,relatime - proc /proc rw +16 20 0:15 / /sys rw,relatime - sysfs /sys rw +17 20 0:5 / /dev rw,relatime - devtmpfs udev rw,size=1983516k,nr_inodes=495879,mode=755 +18 17 0:10 / /dev/pts rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000 +19 17 0:16 / /dev/shm rw,relatime - tmpfs tmpfs rw +20 1 8:4 / / rw,noatime - ext3 /dev/sda4 rw,errors=continue,user_xattr,acl,barrier=0,data=ordered` + + sampleMountinfo = `15 20 0:3 / /proc rw,relatime - proc /proc rw +16 20 0:15 / /sys rw,relatime - sysfs /sys rw +17 20 0:5 / /dev rw,relatime - devtmpfs udev rw,size=1983516k,nr_inodes=495879,mode=755 +18 17 0:10 / /dev/pts rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000 +19 17 0:16 / /dev/shm rw,relatime - tmpfs tmpfs rw +20 1 8:4 / / rw,noatime - ext3 /dev/sda4 rw,errors=continue,user_xattr,acl,barrier=0,data=ordered +21 16 0:17 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755 +22 21 0:18 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd +23 21 0:19 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpuset +24 21 0:20 / /sys/fs/cgroup/ns rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,ns +25 21 0:21 / /sys/fs/cgroup/cpu rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpu +26 21 0:22 / /sys/fs/cgroup/cpuacct rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpuacct +27 21 0:23 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory +28 21 0:24 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,devices +29 21 0:25 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,freezer +30 21 0:26 / /sys/fs/cgroup/net_cls rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,net_cls +31 21 0:27 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,blkio +32 16 0:28 / /sys/kernel/security rw,relatime - autofs systemd-1 rw,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct +33 17 0:29 / /dev/hugepages rw,relatime - autofs systemd-1 rw,fd=23,pgrp=1,timeout=300,minproto=5,maxproto=5,direct +34 16 0:30 / /sys/kernel/debug rw,relatime - autofs systemd-1 rw,fd=24,pgrp=1,timeout=300,minproto=5,maxproto=5,direct +35 15 0:31 / /proc/sys/fs/binfmt_misc rw,relatime - autofs systemd-1 rw,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct +36 17 0:32 / /dev/mqueue rw,relatime - autofs systemd-1 rw,fd=26,pgrp=1,timeout=300,minproto=5,maxproto=5,direct +37 15 0:14 / /proc/bus/usb rw,relatime - usbfs /proc/bus/usb rw +38 33 0:33 / /dev/hugepages rw,relatime - hugetlbfs hugetlbfs rw +39 36 0:12 / /dev/mqueue rw,relatime - mqueue mqueue rw +40 20 8:6 / /boot rw,noatime - ext3 /dev/sda6 rw,errors=continue,barrier=0,data=ordered +41 20 253:0 / /home/kzak rw,noatime - ext4 /dev/mapper/kzak-home rw,barrier=1,data=ordered +42 35 0:34 / /proc/sys/fs/binfmt_misc rw,relatime - binfmt_misc none rw +43 16 0:35 / /sys/fs/fuse/connections rw,relatime - fusectl fusectl rw +44 41 0:36 / /home/kzak/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon gvfs-fuse-daemon rw,user_id=500,group_id=500 +45 20 0:37 / /var/lib/nfs/rpc_pipefs rw,relatime - rpc_pipefs sunrpc rw +47 20 0:38 / /mnt/sounds rw,relatime - cifs //foo.home/bar/ rw,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344 +49 20 0:56 / /mnt/test/foobar rw,relatime shared:323 - tmpfs tmpfs rw` + + sampleMountinfoNoSrc = `15 20 0:3 / /proc rw,relatime - proc /proc rw +16 20 0:15 / /sys rw,relatime - sysfs /sys rw +17 20 0:5 / /dev rw,relatime - devtmpfs udev rw,size=1983516k,nr_inodes=495879,mode=755 +18 17 0:10 / /dev/pts rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000 +19 17 0:16 / /dev/shm rw,relatime - tmpfs tmpfs rw +20 1 8:4 / / rw,noatime - ext3 /dev/sda4 rw,errors=continue,user_xattr,acl,barrier=0,data=ordered +21 20 0:53 / /mnt/test rw,relatime shared:212 - tmpfs rw` +)