Projects/arteekit
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Oystein Kristoffer Tveit 2024-11-23 02:54:01 +01:00
commit fb0c0f0948
Signed by: oysteikt
GPG Key ID: 9F2F7D8250F35146
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use flake

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/target
result
result-*

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[package]
name = "rtkit-rs"
version = "0.1.0"
edition = "2021"
[[bin]]
name = "rtkit"
path = "src/main.rs"
[dependencies]
anyhow = "1.0.93"
bitflags = "2.6.0"
clap = { version = "4.5.21", features = ["derive"] }
nix = { version = "0.29.0", features = ["fs", "process", "resource", "sched"] }
sd-notify = "0.4.3"
tracing = "0.1.40"
zbus = "5.1.1"

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<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

18
README.md Normal file

@ -0,0 +1,18 @@
# arteekit
Linux daemon for serving elevated scheduling privileges to non-privileged processes.
> [!WARNING]
> This is still work in progress, not yet functional.
## What is this?
This project is a rust rewrite of [rtkit][rtkit], which is a daemon that allows
non-privileged processes to request to be switched to [real-time scheduling][real-time-scheduling] over [D-Bus][dbus]
The daemon keeps track of the processes that have been granted real-time scheduling, and will automatically
revoke these grants if the system is under heavy load.
[rtkit]: https://github.com/heftig/rtkit
[real-time-scheduling]: https://www.gnu.org/software/libc/manual/html_node/Realtime-Scheduling.html
[dbus]: https://www.freedesktop.org/wiki/Software/dbus/

48
flake.lock generated Normal file

@ -0,0 +1,48 @@
{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1742288794,
"narHash": "sha256-Txwa5uO+qpQXrNG4eumPSD+hHzzYi/CdaM80M9XRLCo=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "b6eaf97c6960d97350c584de1b6dcff03c9daf42",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs",
"rust-overlay": "rust-overlay"
}
},
"rust-overlay": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1742351546,
"narHash": "sha256-GPubFcOXyi8TVm1xpltHYPcfGr+iO+if2u/EtzFVnHQ=",
"owner": "oxalica",
"repo": "rust-overlay",
"rev": "b0a7450168c62a46f87d204280e6d9d1c0292671",
"type": "github"
},
"original": {
"owner": "oxalica",
"repo": "rust-overlay",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

43
flake.nix Normal file

@ -0,0 +1,43 @@
{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
rust-overlay.url = "github:oxalica/rust-overlay";
rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
};
outputs = { self, nixpkgs, rust-overlay }:
let
inherit (nixpkgs) lib;
systems = [
"x86_64-linux"
"aarch64-linux"
"armv7l-linux"
];
forAllSystems = f: lib.genAttrs systems (system: let
pkgs = import nixpkgs {
inherit system;
overlays = [
(import rust-overlay)
];
};
rust-bin = rust-overlay.lib.mkRustBin { } pkgs.buildPackages;
toolchain = rust-bin.stable.latest.default.override {
extensions = [ "rust-src" "rust-analyzer" "rust-std" ];
};
in f system pkgs toolchain);
in {
devShells = forAllSystems (system: pkgs: toolchain: {
default = pkgs.mkShell {
nativeBuildInputs = [
toolchain
];
RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
};
});
};
}

16
src/canary.rs Normal file

@ -0,0 +1,16 @@
/// The canary thread needs to ensure that it's not disturbed by signals,
/// in order to get an accurate reading of scheduler starvation. This function
/// will disable all signals for the current thread.
fn disable_signals() {}
// The canary thread polls in a loop and measures the time between each time it
// gets rescheduled. If the time between two reschedules is too long, the canary
// thread will report this to the main thread so it can start reducing the realtime
// privileges of the supervised processes.
//
// Or is it the watchdog thread that does this?
fn canary_thread() {}
fn watchdog_thread() {}
// CancellationToken

145
src/cli.rs Normal file

@ -0,0 +1,145 @@
use clap::Parser;
use crate::nix::{SchedPolicy, SchedType};
#[derive(Parser, Debug)]
pub struct Args {
/// Log to STDERR in addition to journald
#[arg(long)]
pub stderr: bool,
/// Run daemon as user
#[arg(long, default_value = "rtkit", value_name = "USER")]
pub user_name: String,
/// Choose scheduling policy
#[arg(long, default_value_t = SchedulingPolicy::Rr)]
pub scheduling_policy: SchedulingPolicy,
/// Realtime priority for the daemon
#[arg(long, default_value = "0", value_name = "[0..99]")]
pub our_realtime_priority: u32,
/// Nice level for the daemon
#[arg(long, default_value = "0", value_name = "[-20..19]")]
pub our_nice_level: i32,
/// Max realtime priority for clients
#[arg(long, default_value = "99", value_name = "[0..99]")]
pub max_realtime_priority: u32,
/// Min nice level for clients
#[arg(long, default_value = "-20", value_name = "[-20..19]")]
pub min_nice_level: i32,
/// Require clients to have set RLIMIT_RTTIME not greater than this
#[arg(long, value_name = "USEC")]
pub rttime_usec_max: Option<u64>,
/// How many users this daemon will serve at max at the same time
#[arg(long)]
pub users_max: Option<u32>,
/// How many processes this daemon will serve at max per user at the same time
#[arg(long)]
pub processes_per_user_max: Option<u32>,
/// How many threads this daemon will serve at max per user at the same time
#[arg(long)]
pub threads_per_user_max: Option<u32>,
/// Enforce requests limits in this time
#[arg(long, value_name = "SEC")]
pub actions_burst_sec: Option<u32>,
/// Allow this many requests per burst
#[arg(long)]
pub actions_per_burst_max: Option<u32>,
/// Canary cheep interval
#[arg(long, default_value = "5000", value_name = "MILLISEC")]
pub canary_cheep_msec: u32,
/// Watchdog action delay
#[arg(long, default_value = "10000", value_name = "MILLISEC")]
pub canary_watchdog_msec: u32,
/// When the canary dies demote unknown processes too?
#[arg(long)]
pub canary_demote_unknown: bool,
/// When the canary dies demote root processes too?
#[arg(long)]
pub canary_demote_root: bool,
/// How long to refuse further requests after the canary died
#[arg(long, default_value = "300", value_name = "SEC")]
pub canary_refuse_sec: u32,
/// Don't run a canary-based RT watchdog
#[arg(long)]
pub no_canary: bool,
/// Don't drop privileges
#[arg(long)]
pub no_drop_privileges: bool,
/// Don't chroot
#[arg(long)]
pub no_chroot: bool,
/// Don't limit daemon's resources
#[arg(long)]
pub no_limit_resources: bool,
}
impl Args {
pub fn proc_dir(&self) -> &str {
if self.no_chroot {
"/proc"
} else {
"/"
}
}
pub fn scheduling_policy(&self) -> SchedPolicy {
let sched_type: SchedType = self.scheduling_policy.into();
SchedPolicy::new(sched_type)
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum SchedulingPolicy {
Fifo,
Rr,
}
impl std::str::FromStr for SchedulingPolicy {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"FIFO" | "fifo" => Ok(Self::Fifo),
"RR" | "rr" => Ok(Self::Rr),
_ => Err(format!("unknown scheduling policy: {}", s)),
}
}
}
impl std::fmt::Display for SchedulingPolicy {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Fifo => write!(f, "FIFO"),
Self::Rr => write!(f, "RR"),
}
}
}
impl Into<SchedType> for SchedulingPolicy {
fn into(self) -> SchedType {
match self {
Self::Fifo => SchedType::SCHED_FIFO,
Self::Rr => SchedType::SCHED_RR,
}
}
}

135
src/core.rs Normal file

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use nix::unistd::{Pid, Uid};
use anyhow::Result;
use crate::{
cli::Args, nix::{sched_get_priority_max, sched_get_priority_min}, self_drop_realtime, self_set_realtime
};
struct User {
uid: Uid,
timestamp: u64,
n_actions: u32,
processes: Vec<Process>,
}
struct Process {
pid: Pid,
starttime: u64,
threads: Vec<Thread>,
}
struct Thread {
tid: Pid,
starttime: u64,
}
struct State {
// TODO:
}
impl State {
fn make_thread_realtime_with_pid(
&mut self,
args: &Args,
user: User,
pid: Pid,
tid: Pid,
priority: u32,
) {
if sched_get_priority_min(args.scheduling_policy())
.is_ok_and(|min| priority < u32::try_from(min).unwrap())
|| sched_get_priority_max(args.scheduling_policy())
.is_ok_and(|max| priority > u32::try_from(max).unwrap())
{
todo!("bail EINVAL")
}
// We always want to be able to get a higher RT priority than the client
if priority >= args.our_realtime_priority
|| priority > args.max_realtime_priority
{
todo!("bail EPERM")
}
// Make sure users don't flood us with requests
if !verify_burst(&user) {
todo!("bail EBUSY")
}
// TODO: implement
self_drop_realtime(args.our_nice_level);
}
fn make_thread_high_priority_with_pid(&mut self) {
unimplemented!()
}
fn reset_known(&mut self) {
unimplemented!()
}
fn reset_all(&mut self) {
unimplemented!()
}
fn exit(&mut self) {
unimplemented!()
}
}
// Polkit
// Unix process lookup
fn read_start_time(pid: Pid, tid: Pid) -> u64 {
unimplemented!("Read /proc and get the start time of the process/thread")
}
fn verify_burst(user: &User) -> bool {
unimplemented!("Check if the user has issued more than ACTIONS_PER_BURST_MAX in this time")
}
// TODO: make into impls
// fn find_user(users: &[User], uid: Uid) -> Option<&User> {
// unimplemented!("Find the user with the given UID")
// }
// fn find_process(user: &User, pid: Pid) -> Option<&Process> {
// unimplemented!("Find the process with the given PID")
// }
// fn find_thread(process: &Process, tid: Pid) -> Option<&Thread> {
// unimplemented!("Find the thread with the given TID")
// }
// fn thread_gc(process: &mut Process) {
// unimplemented!("Garbage collect threads")
// }
// fn process_gc(user: &mut User) {
// unimplemented!("Garbage collect processes")
// }
// fn user_gc(users: &mut Vec<User>) {
// unimplemented!("Garbage collect users")
// }
/* This checks if a thread still matters to us, i.e. if its
* PID still refers to the same thread and if it is still high
* priority or real time */
fn thread_relevant(pid: Pid, tid: Pid) -> bool {
unimplemented!("Check if the thread is still relevant")
}
/* Verifies that RLIMIT_RTTIME is set for the specified process */
fn verify_process_rttime(process: &Process) -> Result<()> {
unimplemented!()
}
// Ensure that the user owns the process
fn verify_process_user(process: &Process, user: &User) -> Result<()> {
unimplemented!()
}

10
src/dbus.rs Normal file

@ -0,0 +1,10 @@
use anyhow::Result;
const RTKIT_DBUS_SERVICE_NAME: &str = "org.freedesktop.RealtimeKit1";
const RTKIT_DBUS_OBJECT_PATH: &str = "/org/freedesktop/RealtimeKit1";
// pub fn setup_dbus() -> Result<> {
// }
// pub fn dbus_handler()

47
src/main.rs Normal file

@ -0,0 +1,47 @@
mod canary;
mod cli;
mod core;
mod dbus;
mod privileges;
// mod sched;
mod nix;
use cli::Args;
use clap::Parser;
use privileges::*;
use anyhow::{bail, Result, Context};
fn main() -> Result<()> {
let args = Args::parse();
if !self_is_root() {
bail!("rtkit must be run as root");
}
// TODO: initialize logging
self_raise_timer_slack(&args).context("failed to raise our own timer slack")?;
self_drop_realtime(args.our_nice_level).context("failed to drop our own realtime scheduler")?;
// setup_dbus();
self_drop_privileges(&args).context("failed to drop our own privileges")?;
if !args.no_limit_resources {
set_resource_limits(&args).context("failed to set resource limits")?;
}
// let canary_handle = start_canary();
// let watchdog_handle = start_watchdog();
self_reduce_umask();
// start_dbus();
Ok(())
}

10
src/nix.rs Normal file

@ -0,0 +1,10 @@
mod macros;
mod priority;
mod sched;
pub use sched::{
sched_get_priority_max, sched_get_priority_min, sched_getscheduler, sched_setscheduler,
SchedFlags, SchedParam, SchedPolicy, SchedType,
};
pub use priority::{getpriority, setpriority, PriorityKind};

322
src/nix/macros.rs Normal file

@ -0,0 +1,322 @@
/// Borrowed from https://github.com/nix-rust/nix/blob/master/src/macros.rs
/// The `libc_bitflags!` macro helps with a common use case of defining a public bitflags type
/// with values from the libc crate. It is used the same way as the `bitflags!` macro, except
/// that only the name of the flag value has to be given.
///
/// The `libc` crate must be in scope with the name `libc`.
///
/// # Example
/// ```ignore
/// libc_bitflags!{
/// pub struct ProtFlags: libc::c_int {
/// PROT_NONE;
/// PROT_READ;
/// /// PROT_WRITE enables write protect
/// PROT_WRITE;
/// PROT_EXEC;
/// #[cfg(linux_android)]
/// PROT_GROWSDOWN;
/// #[cfg(linux_android)]
/// PROT_GROWSUP;
/// }
/// }
/// ```
///
/// Example with casting, due to a mistake in libc. In this example, the
/// various flags have different types, so we cast the broken ones to the right
/// type.
///
/// ```ignore
/// libc_bitflags!{
/// pub struct SaFlags: libc::c_ulong {
/// SA_NOCLDSTOP as libc::c_ulong;
/// SA_NOCLDWAIT;
/// SA_NODEFER as libc::c_ulong;
/// SA_ONSTACK;
/// SA_RESETHAND as libc::c_ulong;
/// SA_RESTART as libc::c_ulong;
/// SA_SIGINFO;
/// }
/// }
/// ```
macro_rules! libc_bitflags {
(
$(#[$outer:meta])*
pub struct $BitFlags:ident: $T:ty {
$(
$(#[$inner:ident $($args:tt)*])*
$Flag:ident $(as $cast:ty)*;
)+
}
) => {
::bitflags::bitflags! {
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[repr(transparent)]
$(#[$outer])*
pub struct $BitFlags: $T {
$(
$(#[$inner $($args)*])*
const $Flag = libc::$Flag $(as $cast)*;
)+
}
}
};
}
/// The `libc_enum!` macro helps with a common use case of defining an enum exclusively using
/// values from the `libc` crate. This macro supports both `pub` and private `enum`s.
///
/// The `libc` crate must be in scope with the name `libc`.
///
/// # Example
/// ```ignore
/// libc_enum!{
/// pub enum ProtFlags {
/// PROT_NONE,
/// PROT_READ,
/// PROT_WRITE,
/// PROT_EXEC,
/// #[cfg(linux_android)]
/// PROT_GROWSDOWN,
/// #[cfg(linux_android)]
/// PROT_GROWSUP,
/// }
/// }
/// ```
// Some targets don't use all rules.
#[allow(unused_macro_rules)]
macro_rules! libc_enum {
// Exit rule.
(@make_enum
name: $BitFlags:ident,
{
$v:vis
attrs: [$($attrs:tt)*],
entries: [$($entries:tt)*],
}
) => {
$($attrs)*
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
$v enum $BitFlags {
$($entries)*
}
};
// Exit rule including TryFrom
(@make_enum
name: $BitFlags:ident,
{
$v:vis
attrs: [$($attrs:tt)*],
entries: [$($entries:tt)*],
from_type: $repr:path,
try_froms: [$($try_froms:tt)*]
}
) => {
$($attrs)*
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
$v enum $BitFlags {
$($entries)*
}
impl ::std::convert::TryFrom<$repr> for $BitFlags {
type Error = nix::Error;
#[allow(unused_doc_comments)]
#[allow(deprecated)]
#[allow(unused_attributes)]
fn try_from(x: $repr) -> nix::Result<Self> {
match x {
$($try_froms)*
_ => Err(nix::Error::EINVAL)
}
}
}
};
// Done accumulating.
(@accumulate_entries
name: $BitFlags:ident,
{
$v:vis
attrs: $attrs:tt,
},
$entries:tt,
$try_froms:tt;
) => {
libc_enum! {
@make_enum
name: $BitFlags,
{
$v
attrs: $attrs,
entries: $entries,
}
}
};
// Done accumulating and want TryFrom
(@accumulate_entries
name: $BitFlags:ident,
{
$v:vis
attrs: $attrs:tt,
from_type: $repr:path,
},
$entries:tt,
$try_froms:tt;
) => {
libc_enum! {
@make_enum
name: $BitFlags,
{
$v
attrs: $attrs,
entries: $entries,
from_type: $repr,
try_froms: $try_froms
}
}
};
// Munch an attr.
(@accumulate_entries
name: $BitFlags:ident,
$prefix:tt,
[$($entries:tt)*],
[$($try_froms:tt)*];
#[$attr:meta] $($tail:tt)*
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
$prefix,
[
$($entries)*
#[$attr]
],
[
$($try_froms)*
#[$attr]
];
$($tail)*
}
};
// Munch last ident if not followed by a comma.
(@accumulate_entries
name: $BitFlags:ident,
$prefix:tt,
[$($entries:tt)*],
[$($try_froms:tt)*];
$entry:ident
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
$prefix,
[
$($entries)*
$entry = libc::$entry,
],
[
$($try_froms)*
libc::$entry => Ok($BitFlags::$entry),
];
}
};
// Munch an ident; covers terminating comma case.
(@accumulate_entries
name: $BitFlags:ident,
$prefix:tt,
[$($entries:tt)*],
[$($try_froms:tt)*];
$entry:ident,
$($tail:tt)*
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
$prefix,
[
$($entries)*
$entry = libc::$entry,
],
[
$($try_froms)*
libc::$entry => Ok($BitFlags::$entry),
];
$($tail)*
}
};
// Munch an ident and cast it to the given type; covers terminating comma.
(@accumulate_entries
name: $BitFlags:ident,
$prefix:tt,
[$($entries:tt)*],
[$($try_froms:tt)*];
$entry:ident as $ty:ty,
$($tail:tt)*
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
$prefix,
[
$($entries)*
$entry = libc::$entry as $ty,
],
[
$($try_froms)*
libc::$entry as $ty => Ok($BitFlags::$entry),
];
$($tail)*
}
};
// Entry rule.
(
$(#[$attr:meta])*
$v:vis enum $BitFlags:ident {
$($vals:tt)*
}
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
{
$v
attrs: [$(#[$attr])*],
},
[],
[];
$($vals)*
}
};
// Entry rule including TryFrom
(
$(#[$attr:meta])*
$v:vis enum $BitFlags:ident {
$($vals:tt)*
}
impl TryFrom<$repr:path>
) => {
libc_enum! {
@accumulate_entries
name: $BitFlags,
{
$v
attrs: [$(#[$attr])*],
from_type: $repr,
},
[],
[];
$($vals)*
}
};
}
pub(crate) use libc_bitflags;
pub(crate) use libc_enum;

86
src/nix/priority.rs Normal file

@ -0,0 +1,86 @@
use nix::{
errno::Errno,
libc::{self, __priority_which_t, id_t},
unistd::{Gid, Pid, Uid},
Result,
};
use super::macros::*;
libc_enum! {
#[repr(u32)]
#[non_exhaustive]
enum WhichPriority {
PRIO_PROCESS,
PRIO_PGRP,
PRIO_USER,
}
}
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum PriorityKind {
Process(Option<Pid>),
Group(Option<Gid>),
User(Option<Uid>),
}
impl From<Pid> for PriorityKind {
fn from(pid: Pid) -> Self {
PriorityKind::Process(Some(pid))
}
}
impl From<Gid> for PriorityKind {
fn from(gid: Gid) -> Self {
PriorityKind::Group(Some(gid))
}
}
impl From<Uid> for PriorityKind {
fn from(uid: Uid) -> Self {
PriorityKind::User(Some(uid))
}
}
impl Into<WhichPriority> for PriorityKind {
fn into(self) -> WhichPriority {
match self {
PriorityKind::Process(_) => WhichPriority::PRIO_PROCESS,
PriorityKind::Group(_) => WhichPriority::PRIO_PGRP,
PriorityKind::User(_) => WhichPriority::PRIO_USER,
}
}
}
impl Into<u32> for PriorityKind {
fn into(self) -> u32 {
match self {
// TODO: Deal with this unwrap
PriorityKind::Process(pid) => pid
.map(|p| u32::try_from(i32::from(p)).unwrap())
.unwrap_or(0),
PriorityKind::Group(gid) => gid.map(|g| g.into()).unwrap_or(0),
PriorityKind::User(uid) => uid.map(|u| u.into()).unwrap_or(0),
}
}
}
fn into_priority_args(priority: PriorityKind) -> (__priority_which_t, id_t) {
let _which = WhichPriority::from(priority.into());
let which = __priority_which_t::from(_which as u32);
let who: id_t = priority.into();
(which, who)
}
pub fn getpriority(priority: PriorityKind) -> Result<i32> {
let (which, who) = into_priority_args(priority);
let res = unsafe { libc::getpriority(which, who) };
Errno::result(res)
}
pub fn setpriority(priority: PriorityKind, prio: i32) -> Result<i32> {
let (which, who) = into_priority_args(priority);
let result = unsafe { libc::setpriority(which, who, prio) };
Errno::result(result)
}

183
src/nix/sched.rs Normal file

@ -0,0 +1,183 @@
/// Kindly borrowed from https://github.com/nix-rust/nix/pull/1435
use nix::{
errno::Errno,
libc::{self, c_int},
unistd::Pid,
Result,
};
use super::macros::*;
libc_enum! {
#[repr(i32)]
#[non_exhaustive]
pub enum SchedType {
#[cfg(target_os = "android")]
SCHED_NORMAL,
#[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "fuchsia", target_os = "illumos", target_os = "linux", target_os = "netbsd"))]
SCHED_OTHER,
#[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", target_os = "fuchsia", target_os = "illumos", target_os = "linux", target_os = "netbsd"))]
SCHED_FIFO,
#[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", target_os = "fuchsia", target_os = "illumos", target_os = "linux", target_os = "netbsd"))]
SCHED_RR,
#[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
SCHED_BATCH,
#[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
SCHED_IDLE,
#[cfg(target_os = "android")]
SCHED_DEADLINE,
#[cfg(target_os = "illumos")]
SCHED_SYS,
#[cfg(target_os = "illumos")]
SCHED_IA,
#[cfg(target_os = "illumos")]
SCHED_FSS,
#[cfg(target_os = "illumos")]
SCHED_FX,
}
impl TryFrom<i32>
}
libc_bitflags! {
pub struct SchedFlags: c_int {
#[cfg(target_os = "linux")]
SCHED_RESET_ON_FORK;
}
}
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub struct SchedPolicy {
pub sched_type: SchedType,
#[cfg(target_os = "linux")]
pub sched_flags: SchedFlags,
}
impl SchedPolicy {
pub fn new(sched_type: SchedType) -> Self {
SchedPolicy::_with_flags(sched_type, SchedFlags::empty())
}
pub fn with_flags(sched_type: SchedType, sched_flags: SchedFlags) -> Self {
SchedPolicy::_with_flags(sched_type, sched_flags)
}
#[cfg(target_os = "linux")]
pub const fn bits(&self) -> i32 {
self.sched_type as i32 | self.sched_flags.bits()
}
#[cfg(not(target_os = "linux"))]
pub const fn bits(&self) -> i32 {
self.sched_type as i32
}
#[cfg(target_os = "linux")]
pub fn from_bits(bits: i32) -> Option<Self> {
let type_bits = bits & !SchedFlags::all().bits();
let sched_type = SchedType::try_from(type_bits).ok()?;
let flag_bits = bits & SchedFlags::all().bits();
let sched_flags = SchedFlags::from_bits(flag_bits)?;
Some(SchedPolicy::with_flags(sched_type, sched_flags))
}
#[cfg(not(target_os = "linux"))]
pub fn from_bits(bits: i32) -> Option<Self> {
let type_bits = bits & !SchedFlags::all().bits();
let sched_type = SchedType::try_from(type_bits).ok()?;
Some(SchedPolicy::new(sched_type))
}
#[cfg(target_os = "linux")]
#[inline]
fn _with_flags(sched_type: SchedType, sched_flags: SchedFlags) -> Self {
SchedPolicy {
sched_type,
sched_flags,
}
}
#[cfg(not(target_os = "linux"))]
#[inline]
fn _with_flags(sched_type: SchedType, _sched_flags: SchedFlags) -> Self {
SchedPolicy { sched_type }
}
}
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub struct SchedParam(libc::sched_param);
impl SchedParam {
pub fn new(priority: i32) -> Self {
let sched_param = unsafe {
// Illumos's sched_param has a private padding field.
let mut param = std::mem::MaybeUninit::<libc::sched_param>::zeroed();
let p = param.as_mut_ptr();
(*p).sched_priority = priority;
param.assume_init()
};
SchedParam(sched_param)
}
pub const fn priority(&self) -> i32 {
self.0.sched_priority
}
}
impl Default for SchedParam {
fn default() -> Self {
SchedParam::new(0)
}
}
/// Get minimum priority value for policy
///
/// See also [`sched_get_priority_min(2)`](https://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_get_priority_min.html)
pub fn sched_get_priority_min(policy: SchedPolicy) -> Result<i32> {
let res = unsafe { libc::sched_get_priority_min(policy.bits()) };
Errno::result(res)
}
/// Get maximum priority value for policy
///
/// See also [`sched_get_priority_max(2)`](https://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_get_priority_max.html)
pub fn sched_get_priority_max(policy: SchedPolicy) -> Result<i32> {
let res = unsafe { libc::sched_get_priority_max(policy.bits()) };
Errno::result(res)
}
/// Set thread's scheduling policy and parameters
///
/// `pid` is the thread ID to update.
/// If `pid` is None or zero, then the policy and parameters for the calling thread are set.
///
/// See also [`sched_setscheduler(2)`](https://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_setscheduler.html)
pub fn sched_setscheduler(
pid: Option<Pid>,
policy: SchedPolicy,
sched_param: SchedParam,
) -> Result<()> {
let res = unsafe {
libc::sched_setscheduler(
pid.unwrap_or_else(|| Pid::from_raw(0)).into(),
policy.bits(),
&sched_param.0,
)
};
Errno::result(res).map(drop)
}
/// Get thread's scheduling policy and parameters
///
/// `pid` is the thread ID to check.
/// If `pid` is None or zero, then the policy and parameters for the calling thread are retrieved.
///
/// See also [`sched_getscheduler(2)`](https://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_getscheduler.html)
pub fn sched_getscheduler(pid: Option<Pid>) -> Result<SchedPolicy> {
let res = unsafe { libc::sched_getscheduler(pid.unwrap_or_else(|| Pid::from_raw(0)).into()) };
Errno::result(res).and(SchedPolicy::from_bits(res).ok_or(Errno::EINVAL))
}

90
src/privileges.rs Normal file

@ -0,0 +1,90 @@
use std::{env::set_current_dir, os::unix::fs::chroot};
use anyhow::Result;
use nix::{
sys::{
prctl,
resource::{getrlimit, setrlimit, Resource},
stat::{umask, Mode},
},
unistd::{getuid, User},
};
use crate::{cli::Args, nix::*};
pub fn self_is_root() -> bool {
getuid().is_root()
}
pub fn self_raise_timer_slack(args: &Args) -> Result<()> {
let slack_ns = u64::from((args.canary_watchdog_msec - args.canary_cheep_msec) / 2) * 1_000_000;
prctl::set_timerslack(slack_ns)?;
Ok(())
}
pub fn self_drop_privileges(args: &Args) -> Result<()> {
let user = if !args.no_drop_privileges {
Some(User::from_name(&args.user_name)?)
} else {
None
};
if !args.no_chroot {
chroot("/proc")?;
set_current_dir("/")?;
}
if let Some(user) = user { }
Ok(())
}
pub fn set_resource_limits(args: &Args) -> Result<()> {
let limits: [(Resource, nix::libc::rlim_t); 8] = [
(Resource::RLIMIT_FSIZE, 0),
(Resource::RLIMIT_MEMLOCK, 0),
(Resource::RLIMIT_MSGQUEUE, 0),
(Resource::RLIMIT_NICE, 20),
(Resource::RLIMIT_NOFILE, 50),
(Resource::RLIMIT_NPROC, 3),
(Resource::RLIMIT_RTPRIO, 0),
(Resource::RLIMIT_RTTIME, args.rttime_usec_max.unwrap_or(0)),
];
for (resource, value) in limits.into_iter() {
let (_, rlim_max) = getrlimit(resource)?;
if rlim_max < value {
continue;
}
setrlimit(resource, value, value)?;
}
Ok(())
}
pub fn self_set_realtime(args: &Args, priority: i32) -> Result<()> {
let policy = SchedPolicy::with_flags(
args.scheduling_policy.into(),
SchedFlags::SCHED_RESET_ON_FORK,
);
let param = SchedParam::new(priority);
sched_setscheduler(None, policy, param)?;
Ok(())
}
pub fn self_drop_realtime(nice_level: i32) -> Result<()> {
let param = SchedParam::default();
let policy = SchedPolicy::new(SchedType::SCHED_OTHER);
sched_setscheduler(None, policy, param)?;
setpriority(PriorityKind::Process(None), nice_level)?;
Ok(())
}
pub fn self_reduce_umask() {
umask(Mode::from_bits_truncate(0o777));
}

1
src/util.rs Normal file

@ -0,0 +1 @@