virtvzd_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 6 versions
, in opensuse-leap 16.0

✨ virtvzd_selinux ✨

Okay so bestie, this is the manual page for virtvzd_selinux, which is literally the Security Enhanced Linux Policy for the virtvzd processes. Periodt. We're gonna get into all the SELinux tea together, so grab a strawberry drink 🍓 and let's go.

💖 NAME 💖

virtvzd_selinux — it's giving Security Enhanced Linux Policy for the virtvzd processes, fr fr.

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the virtvzd processes via flexible mandatory access control. No cap, it's lowkey iconic how it locks things down.

The virtvzd processes execute with the virtvzd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

For example:

ps -eZ | grep virtvzd_t

Simple as that, bestie. Slay. 💅

🦋 ENTRYPOINTS 🦋

The virtvzd_t SELinux type can be entered via the virtvzd_exec_t file type.

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

/usr/bin/virtvzd

That's the one path, and it ate. ✨

🎀 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 virtvzd policy is very flexible, allowing users to setup their virtvzd processes in as secure a method as possible. Obsessed with the security.

The following process types are defined for virtvzd:

  • virtvzd_t
Note: semanage permissive -a virtvzd_t can be used to make the process type virtvzd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

So like, it's not a free-for-all, it just doesn't block. But it still snitches to the logs. Iykyk. 👀

🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. virtvzd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run virtvzd with the tightest access possible. Let's get into it, bestie.

  • If you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on the daemons_dontaudit_scheduling boolean. Enabled by default.
setsebool -P daemons_dontaudit_scheduling 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
Bestie, this one is serious. 🚨 Dangerous energy.
  • 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 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, and this executable should be reported in bugzilla — you must turn on the selinuxuser_execheap boolean. Disabled by default.
setsebool -P selinuxuser_execheap 1
Okay but for real for real, "really bad idea" is the manual page talking, not me.
  • 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, and this executable should be reported in bugzilla — you must turn on the selinuxuser_execstack boolean. Disabled by default.
setsebool -P selinuxuser_execstack 1
"Never, ever" is doing a LOT of heavy lifting there. Not the vibe. 💀

🧚 MANAGED FILES 🧚

The SELinux process type virtvzd_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. So like, SELinux isn't the only gatekeeper, bestie.

  • file_type — all files on the system

Yeah that's the whole list. All files. Main character energy. 👑

🌈 FILE CONTEXTS 🌈

SELinux requires files to have an extended attribute to define the file type. It's literally how it knows what's what.

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 virtvzd policy is very flexible, allowing users to setup their virtvzd processes in as secure a method as possible. So good.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the virtvzd. 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.

semanage fcontext -a -t virtvzd_t '/srv/virtvzd/content(/.*)?'
restorecon -R -v /srv/myvirtvzd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. Regex queen behavior. 💅

The following file types are defined for virtvzd:

  • virtvzd_exec_t — set files with the virtvzd_exec_t type if you want to transition an executable to the virtvzd_t domain.
  • virtvzd_t — set files with the virtvzd_t type if you want to treat the files as virtvzd data.
  • virtvzd_var_run_t — set files with the virtvzd_var_run_t type if you want to store the virtvzd 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.

So like, chcon is the quick fix, semanage fcontext is the permanent slay. Don't confuse them. 🙈

💜 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.

GUI gang, I see you. 🫶

👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. The robots wrote it, not me. But the attitude? All mine.

💖 SEE ALSO 💖

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

Go read those if you wanna know more, bestie. Knowledge is power. ✨

Okay that's the whole thing! Hope this helped you understand the virtvzd_selinux policy vibes. This iconic page is from 26-10-06 (that's the version date, bestie), and remember — SELinux just wants you to be safe. Periodt. 🎀 Bye! 💖

📦 where this page comes from