Security-Enhanced Linux secures the lvm processes via flexible mandatory access control.
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.
ps -eZ | grep lvm_t
The lvm_t SELinux type can be entered via the lvm_exec_t file type.
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.*, /sbin/lvm, /sbin/lvs, /sbin/pvs, /sbin/vgs, /sbin/vgck, /sbin/dmraid, /sbin/kpartx, /sbin/lvmsar, /sbin/lvscan, /sbin/pvdata, /sbin/pvmove, /sbin/pvscan, /sbin/vgscan, /sbin/dmsetup, /sbin/e2fsadm, /sbin/lvmetad, /sbin/lvmsadc, /sbin/vgmerge, /sbin/vgsplit, /usr/sbin/lvm, /usr/sbin/lvs, /usr/sbin/pvs, /usr/sbin/vgs, /sbin/lvchange, /sbin/lvcreate, /sbin/lvextend, /sbin/lvmpolld, /sbin/lvreduce, /sbin/lvremove, /sbin/lvrename, /sbin/lvresize, /sbin/pvchange, /sbin/pvcreate, /sbin/pvremove, /sbin/vgchange, /sbin/vgcreate, /sbin/vgexport, /sbin/vgextend, /sbin/vgimport, /sbin/vgreduce, /sbin/vgremove, /sbin/vgrename, /usr/sbin/vgck, /sbin/lvdisplay, /sbin/lvmchange, /sbin/pvdisplay, /sbin/vgdisplay, /sbin/vgmknodes, /sbin/vgwrapper, /sbin/cryptsetup, /sbin/lvm.static, /sbin/multipathd, /usr/sbin/dmraid, /usr/sbin/kpartx, /usr/sbin/lvmsar, /usr/sbin/lvscan, /usr/sbin/pvdata, /usr/sbin/pvmove, /usr/sbin/pvscan, /usr/sbin/vgscan, /sbin/lvmdiskscan, /sbin/mount.crypt, /sbin/vgcfgbackup, /usr/sbin/dmsetup, /usr/sbin/e2fsadm, /usr/sbin/lvmetad, /usr/sbin/lvmsadc, /usr/sbin/vgmerge, /usr/sbin/vgsplit, /sbin/umount.crypt, /sbin/vgcfgrestore, /usr/sbin/dmeventd, /usr/sbin/lvchange, /usr/sbin/lvcreate, /usr/sbin/lvextend, /usr/sbin/lvmlockd, /usr/sbin/lvmpolld, /usr/sbin/lvreduce, /usr/sbin/lvremove, /usr/sbin/lvrename, /usr/sbin/lvresize, /usr/sbin/pvchange, /usr/sbin/pvcreate, /usr/sbin/pvremove, /usr/sbin/vgchange, /usr/sbin/vgcreate, /usr/sbin/vgexport, /usr/sbin/vgextend, /usr/sbin/vgimport, /usr/sbin/vgreduce, /usr/sbin/vgremove, /usr/sbin/vgrename, /sbin/lvmiopversion, /sbin/vgscan.static, /usr/sbin/lvdisplay, /usr/sbin/lvmchange, /usr/sbin/pvdisplay, /usr/sbin/vgdisplay, /usr/sbin/vgmknodes, /usr/sbin/vgwrapper, /sbin/dmsetup.static, /usr/sbin/cryptsetup, /usr/sbin/lvm.static, /usr/sbin/multipathd, /sbin/vgchange.static, /usr/sbin/lvmdiskscan, /usr/sbin/mount.crypt, /usr/sbin/vgcfgbackup, /sbin/multipath.static, /usr/sbin/vgcfgrestore, /usr/sbin/lvmiopversion, /usr/sbin/vgscan.static, /usr/sbin/dmsetup.static, /usr/sbin/vgchange.static, /usr/lib/storaged/storaged, /usr/sbin/multipath.static, /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
You can see the context of a process using the -Z option to psP 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.
The following process types are defined for lvm:
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.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
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
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
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
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
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
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
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
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. Enabled by default.
setsebool -P selinuxuser_execstack 1
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.
all files on the system
You can see the context of a file using the -Z option to lsP 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.
lvm policy stores data with multiple different file context types under the /var/run/multipathd directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/run/multipathd /srv/multipathd
restorecon -R -v /srv/multipathd
STANDARD FILE CONTEXT
SELinux defines the file context types for the lvm, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t lvm_unit_file_t '/srv/mylvm_content(/.*)?'
restorecon -R -v /srv/mylvm_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for lvm:
- Set files with the lvm_etc_t type, if you want to store lvm files in the /etc directories.
- Set files with the lvm_exec_t type, if you want to transition an executable to the lvm_t domain.
- 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
- Set files with the lvm_metadata_t type, if you want to treat the files as lvm metadata data.
- Set files with the lvm_tmp_t type, if you want to store lvm temporary files in the /tmp directories.
- Set files with the lvm_unit_file_t type, if you want to treat the files as lvm unit content.
- Set files with the lvm_var_lib_t type, if you want to store the lvm files under the /var/lib directory.
- Set files with the lvm_var_run_t type, if you want to store the lvm files under the /run or /var/run directory.
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.
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.