lvm_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 7 versions
, in opensuse-leap 16.0

💅 lvm_selinux(8) — SELinux Policy lvm

okay so bestie, welcome to the manual page for lvm_selinux, from the SELinux Policy lvm corner of the universe. buckle up, it's giving security content ✨

🌸 NAME 🌸

lvm_selinux — Security Enhanced Linux Policy for the lvm processes

🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the lvm processes via flexible mandatory access control. no cap, that's the whole vibe.

The lvm processes execute with the lvm_t SELinux type. you can check if you have these processes running by executing the ps command with the -Z qualifier — literally that's it, that's the check 💅

For example:

ps -eZ | grep lvm_t

🎀 ENTRYPOINTS 🎀

The lvm_t SELinux type can be entered via the lvm_exec_t file type. that's the doorway, bestie 🚪✨

The default entrypoint paths for the lvm_t domain are the following:

/lib/lvm-10/.*, /lib/lvm-200/.*, /usr/lib/lvm-10/.*,
/usr/lib/lvm-200/.*, /usr/lib/systemd/system-generators/lvm2.*,
/usr/bin/lvm, /usr/bin/lvs, /usr/bin/pvs, /usr/bin/vgs, /usr/bin/vgck,
/usr/bin/dmraid, /usr/bin/kpartx, /usr/bin/lvmsar, /usr/bin/lvscan,
/usr/bin/pvdata, /usr/bin/pvmove, /usr/bin/pvscan, /usr/bin/vgscan,
/usr/bin/dmsetup, /usr/bin/e2fsadm, /usr/bin/lvmetad, /usr/bin/lvmsadc,
/usr/bin/vgmerge, /usr/bin/vgsplit, /usr/bin/dmeventd,
/usr/bin/lvchange, /usr/bin/lvcreate, /usr/bin/lvextend,
/usr/bin/lvmdbusd, /usr/bin/lvmlockd, /usr/bin/lvmpolld,
/usr/bin/lvreduce, /usr/bin/lvremove, /usr/bin/lvrename,
/usr/bin/lvresize, /usr/bin/pvchange, /usr/bin/pvcreate,
/usr/bin/pvremove, /usr/bin/vgchange, /usr/bin/vgcreate,
/usr/bin/vgexport, /usr/bin/vgextend, /usr/bin/vgimport,
/usr/bin/vgreduce, /usr/bin/vgremove, /usr/bin/vgrename,
/usr/bin/lvdisplay, /usr/bin/lvmchange, /usr/bin/pvdisplay,
/usr/bin/vgdisplay, /usr/bin/vgmknodes, /usr/bin/vgwrapper,
/usr/bin/cryptsetup, /usr/bin/lvm.static, /usr/bin/lvmlockctl,
/usr/bin/multipathd, /usr/bin/lvmdiskscan, /usr/bin/mount.crypt,
/usr/bin/vgcfgbackup, /usr/bin/vgcfgrestore, /usr/bin/lvmiopversion,
/usr/bin/vgscan.static, /usr/bin/dmsetup.static,
/usr/bin/vgchange.static, /usr/bin/multipath.static,
/usr/lib/storaged/storaged, /lib/udev/udisks-lvm-pv-export,
/usr/libexec/storaged/storaged, /usr/lib/udev/udisks-lvm-pv-export,
/usr/lib/systemd/systemd-cryptsetup, /usr/lib/storaged/storaged-lvm-helper

like... that's a lot of paths and every single one of them matters, so don't come for me about the list length 🔥

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. it's giving organized.

You can see the context of a process using the -Z option to ps.

Policy governs the access confined processes have to files. SELinux lvm policy is very flexible allowing users to setup their lvm processes in as secure a method as possible. yes queen, security AND flexibility 🌈

The following process types are defined for lvm:

lvm_t
Note: semanage permissive -a lvm_t can be used to make the process type lvm_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it's permissive not blind — the receipts still show up 😭

✨ BOOLEANS ✨

SELinux policy is customizable based on least access required. lvm policy is extremely flexible and has several booleans that allow you to manipulate the policy and run lvm with the tightest access possible. let's go through them one by one, no skipping 💅

  • deny_execmem — if you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Disabled by default.
setsebool -P deny_execmem 1
  • mmap_low_allowed — if you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on the mmap_low_allowed boolean. Disabled by default.
setsebool -P mmap_low_allowed 1
  • nis_enabled — if you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
  • secure_mode_insmod — if you want to disable kernel module loading, you must turn on the secure_mode_insmod boolean. Disabled by default.
setsebool -P secure_mode_insmod 1
  • selinuxuser_execheap — if you want to allow unconfined executables to make their heap memory executable. Doing this is a really bad idea. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execheap boolean. Disabled by default.
setsebool -P selinuxuser_execheap 1
  • selinuxuser_execstack — if you want to allow unconfined executables to make their stack executable. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execstack boolean. Disabled by default.
setsebool -P selinuxuser_execstack 1
fr fr, those last two are bad ideas — the manpage itself says so, I'm just matching the energy 💀 report the executable in bugzilla, bestie.

🫶 MANAGED FILES 🫶

The SELinux process type lvm_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions. (yep, SELinux doesn't hand out free passes, you still need regular permissions too 🎀)

  • file_type — all files on the system

🌟 FILE CONTEXTS 🌟

SELinux requires files to have an extended attribute to define the file type. the ✨metadata✨ of it all.

You can see the context of a file using the -Z option to ls.

Policy governs the access confined processes have to these files. SELinux lvm policy is very flexible allowing users to setup their lvm processes in as secure a method as possible.

💖 STANDARD FILE CONTEXT 💖

SELinux defines the file context types for the lvm, if you wanted to store files with these types in a different paths, you need to execute the semanage command to specify alternate labeling and then use restorecon to put the labels on disk. like a glow-up but for file labels 💅

semanage fcontext -a -t lvm_exec_t '/srv/lvm/content(/.*)?'
restorecon -R -v /srv/mylvm_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🙈

The following file types are defined for lvm:

  • lvm_etc_t — Set files with the lvm_etc_t type, if you want to store lvm files in the /etc directories.
  • lvm_exec_t — Set files with the lvm_exec_t type, if you want to transition an executable to the lvm_t domain.

Paths:

/lib/lvm-10/.*, /lib/lvm-200/.*, /usr/lib/lvm-10/.*,
/usr/lib/lvm-200/.*, /usr/lib/systemd/system-generators/lvm2.*,
/usr/bin/lvm, /usr/bin/lvs, /usr/bin/pvs, /usr/bin/vgs,
/usr/bin/vgck, /usr/bin/dmraid, /usr/bin/kpartx, /usr/bin/lvmsar,
/usr/bin/lvscan, /usr/bin/pvdata, /usr/bin/pvmove, /usr/bin/pvscan,
/usr/bin/vgscan, /usr/bin/dmsetup, /usr/bin/e2fsadm,
/usr/bin/lvmetad, /usr/bin/lvmsadc, /usr/bin/vgmerge,
/usr/bin/vgsplit, /usr/bin/dmeventd, /usr/bin/lvchange,
/usr/bin/lvcreate, /usr/bin/lvextend, /usr/bin/lvmdbusd,
/usr/bin/lvmlockd, /usr/bin/lvmpolld, /usr/bin/lvreduce,
/usr/bin/lvremove, /usr/bin/lvrename, /usr/bin/lvresize,
/usr/bin/pvchange, /usr/bin/pvcreate, /usr/bin/pvremove,
/usr/bin/vgchange, /usr/bin/vgcreate, /usr/bin/vgexport,
/usr/bin/vgextend, /usr/bin/vgimport, /usr/bin/vgreduce,
/usr/bin/vgremove, /usr/bin/vgrename, /usr/bin/lvdisplay,
/usr/bin/lvmchange, /usr/bin/pvdisplay, /usr/bin/vgdisplay,
/usr/bin/vgmknodes, /usr/bin/vgwrapper, /usr/bin/cryptsetup,
/usr/bin/lvm.static, /usr/bin/lvmlockctl, /usr/bin/multipathd,
/usr/bin/lvmdiskscan, /usr/bin/mount.crypt, /usr/bin/vgcfgbackup,
/usr/bin/vgcfgrestore, /usr/bin/lvmiopversion,
/usr/bin/vgscan.static, /usr/bin/dmsetup.static,
/usr/bin/vgchange.static, /usr/bin/multipath.static,
/usr/lib/storaged/storaged, /lib/udev/udisks-lvm-pv-export,
/usr/libexec/storaged/storaged, /usr/lib/udev/udisks-lvm-pv-export,
/usr/lib/systemd/systemd-cryptsetup, /usr/lib/storaged/storaged-lvm-helper
  • lvm_lock_t — Set files with the lvm_lock_t type, if you want to treat the files as lvm lock data, stored under the /var/lock directory

Paths:

/etc/lvm/lock(/.*)?, /run/lock/lvm(/.*)?, /run/lock/dmraid(/.*)?
  • lvm_metadata_t — Set files with the lvm_metadata_t type, if you want to treat the files as lvm metadata data.

Paths:

/etc/lvmtab(/.*)?, /etc/lvmtab.d(/.*)?, /etc/lvm/cache(/.*)?,
/etc/multipath(/.*)?, /etc/lvm/backup(/.*)?,
/etc/lvm/archive(/.*)?, /var/cache/multipathd(/.*)?,
/etc/lvm/.cache
  • lvm_tmp_t — Set files with the lvm_tmp_t type, if you want to store lvm temporary files in the /tmp directories.
  • lvm_unit_file_t — Set files with the lvm_unit_file_t type, if you want to treat the files as lvm unit content.

Paths:

/usr/lib/systemd/system/lvm2.*.service,
/usr/lib/systemd/generator/lvm.*
  • lvm_var_lib_t — Set files with the lvm_var_lib_t type, if you want to store the lvm files under the /var/lib directory.
  • lvm_var_run_t — Set files with the lvm_var_run_t type, if you want to store the lvm files under the /run or /var/run directory.

Paths:

/run/lvm(/.*)?, /run/dmevent.*, /run/storaged(/.*)?,
/run/cryptsetup(/.*)?, /run/multipathd(/.*)?, /run/multipathd.sock
Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels. temporary vs permanent, know the difference bestie 😭💀

💜 COMMANDS 💜

  • semanage fcontext can also be used to manipulate default file context mappings.
  • semanage permissive can also be used to manipulate whether or not a process type is permissive.
  • semanage module can also be used to enable/disable/install/remove policy modules.
  • semanage boolean can also be used to manipulate the booleans
  • system-config-selinux is a GUI tool available to customize SELinux policy settings. (a GUI! for the visual girlies 🎀)

🧚 AUTHOR 🧚

This manual page was auto-generated using sepolicy manpage. yes, a robot wrote it, but I gave it the personality, iykyk 💅

⭐ SEE ALSO ⭐

selinux(8), lvm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

and that's the whole page, bestie — go forth and label your files correctly. this iconic little manpage came from lvm, dated 26-10-06, and it's filed under lvm_selinux(8) forever and always 🦋💖

📦 where this page comes from