MYSQLD_SYSTEMD_HELPER_SELINUX(8)

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

💖 mysqld_systemd_helper_selinux(8) — the SELinux policy page for mysqld_systemd_helper, bestie edition 💖

okay so real talk: this whole page lives in the mysqld_..._selinux(8) manual, and it's literally the SELinux policy doc for the mysqld_systemd_helper processes. grab a strawberry drink 🍓 and let's go.

✨ NAME ✨

mysqld_systemd_helper_selinux — the Security Enhanced Linux policy for the mysqld_systemd_helper processes. that's it, that's the name, slay. 👑

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the mysqld_systemd_helper processes via flexible mandatory access control. yes bestie, mandatory — not the vibes-based optional kind. 🔥

The mysqld_systemd_helper processes execute with the mysqld_systemd_helper_t SELinux type. wanna check if you've got these processes running? run ps with the -Z qualifier. easy.

For example:

ps -eZ | grep mysqld_systemd_helper_t

look at you go, doing a vibe check on your process contexts. 🦋

🚪 ENTRYPOINTS 🚪

The mysqld_systemd_helper_t SELinux type can be entered via the mysqld_systemd_helper_exec_t file type. that's the door, that's the way in, periodt. 💅

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

/usr/libexec/mysql/mysql-systemd-helper

one path. iconic, honestly.

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. yes, each — everybody gets their own little domain, main character energy for every process. ✨

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

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

The following process types are defined for mysqld_systemd_helper:

  • mysqld_systemd_helper_t
Note: semanage permissive -a mysqld_systemd_helper_t can be used to make the process type mysqld_systemd_helper_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it stops blocking you but it will still be watching and taking notes. 😭

🎀 BOOLEANS 🎀

SELinux policy is customizable based on least access required. mysqld_systemd_helper policy is extremely flexible and has several booleans that allow you to manipulate the policy and run mysqld_systemd_helper with the tightest access possible. tightest access possible, we love a lowkey queen. 🙈

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

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, you must turn on the selinuxuser_execheap boolean. 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. Disabled by default.

setsebool -P selinuxuser_execheap 1
ngl bestie, execheap is giving 💀 — please don't.

If you want to allow unconfined executables to make their stack executable, you must turn on the selinuxuser_execstack boolean. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla. Disabled by default.

setsebool -P selinuxuser_execstack 1
fr fr, execstack should never, ever be necessary. the manpage said it with its whole chest and so am i. 😤

🗂️ MANAGED FILES 🗂️

The SELinux process type mysqld_systemd_helper_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. yeah, SELinux is not out here overriding good old DAC — both of them get a say. 🫶

  • file_type
    • all files on the system

like. all of them. no cap. 🌈

📁 FILE CONTEXTS 📁

SELinux requires files to have an extended attribute to define the file type. it's giving xattr supremacy. ⭐

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

🌟 STANDARD FILE CONTEXT 🌟

SELinux defines the file context types for the mysqld_systemd_helper. 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 mysqld_systemd_helper_exec_t '/srv/mysqld_systemd_helper/content(/.*)?'
restorecon -R -v /srv/mymysqld_systemd_helper_content
yes, the paths in those two lines really are different in the original — mysqld_systemd_helper in the first, mymysqld_systemd_helper_content in the second. copying it exactly, bestie. not my fault, i just work here. 🧚
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies stay winning. 🎀

The following file types are defined for mysqld_systemd_helper:

  • mysqld_systemd_helper_exec_t — Set files with the mysqld_systemd_helper_exec_t type, if you want to transition an executable to the mysqld_systemd_helper_t domain.
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, iykyk. 💅

🛠️ 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 girlies who like buttons. 🔥

💜 AUTHOR 💜

This manual page was auto-generated using sepolicy manpage.

🔎 SEE ALSO 🔎

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

and that's the whole page, bestie! 🌸 this little writeup is for mysqld_systemd_helper, dated 26-10-06, from the mysqld_..._selinux(8) manual — go forth and label responsibly. mwah. 😘💖

📦 where this page comes from