bjorn3
1327 lines
48 KiB
Rust
1327 lines
48 KiB
Rust
use crate::{
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arch::paging::{Page, VirtualAddress},
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context::{
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self,
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context::{HardBlockedReason, SignalState},
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file::{FileDescriptor, InternalFlags},
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memory::{handle_notify_files, AddrSpace, AddrSpaceWrapper, Grant, PageSpan},
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Context, Status,
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},
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memory::{get_page_info, AddRefError, RefKind, PAGE_SIZE},
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ptrace,
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scheme::{self, FileHandle, KernelScheme},
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syscall::{
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data::{GrantDesc, Map, SetSighandlerData, Stat},
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error::*,
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flag::*,
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usercopy::{UserSliceRo, UserSliceRw, UserSliceWo},
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EnvRegisters, FloatRegisters, IntRegisters,
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},
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};
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use super::{CallerCtx, GlobalSchemes, KernelSchemes, OpenResult};
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use ::syscall::{ProcSchemeAttrs, SigProcControl, Sigcontrol};
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use alloc::{
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boxed::Box,
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collections::{btree_map::Entry, BTreeMap},
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string::String,
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sync::{Arc, Weak},
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vec::Vec,
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};
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use core::{
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mem::{self, size_of},
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num::NonZeroUsize,
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slice, str,
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sync::atomic::{AtomicBool, AtomicUsize, Ordering},
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};
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use spin::RwLock;
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use spinning_top::RwSpinlock;
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fn read_from(dst: UserSliceWo, src: &[u8], offset: u64) -> Result<usize> {
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let avail_src = usize::try_from(offset)
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.ok()
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.and_then(|o| src.get(o..))
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.unwrap_or(&[]);
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dst.copy_common_bytes_from_slice(avail_src)
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}
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fn try_stop_context<T>(
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context_ref: Arc<RwSpinlock<Context>>,
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callback: impl FnOnce(&mut Context) -> Result<T>,
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) -> Result<T> {
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if context::is_current(&context_ref) {
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return callback(&mut *context_ref.write());
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}
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// Stop process
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let (prev_status, mut running) = {
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let mut context = context_ref.write();
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(
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core::mem::replace(
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&mut context.status,
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context::Status::HardBlocked {
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reason: HardBlockedReason::NotYetStarted,
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},
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),
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context.running,
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)
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};
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// Wait until stopped
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while running {
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context::switch();
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running = context_ref.read().running;
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}
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let mut context = context_ref.write();
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assert!(
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!context.running,
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"process can't have been restarted, we stopped it!"
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);
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let ret = callback(&mut *context);
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context.status = prev_status;
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ret
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}
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#[derive(Clone, Copy, PartialEq, Eq)]
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enum RegsKind {
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Float,
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Int,
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Env,
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}
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#[derive(Clone)]
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enum ContextHandle {
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// Opened by the process manager, after which it is locked. This capability is used to open
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// Attr handles, to set ens/euid/egid/pid.
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Authority,
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Attr,
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Status {
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privileged: bool,
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}, // can write ContextVerb
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Regs(RegsKind),
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Sighandler,
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Start,
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NewFiletable {
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filetable: Arc<RwLock<Vec<Option<FileDescriptor>>>>,
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data: Box<[u8]>,
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},
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Filetable {
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filetable: Weak<RwLock<Vec<Option<FileDescriptor>>>>,
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data: Box<[u8]>,
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},
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AddrSpace {
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addrspace: Arc<AddrSpaceWrapper>,
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},
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CurrentAddrSpace,
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AwaitingAddrSpaceChange {
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new: Arc<AddrSpaceWrapper>,
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new_sp: usize,
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new_ip: usize,
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},
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CurrentFiletable,
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AwaitingFiletableChange {
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new_ft: Arc<RwLock<Vec<Option<FileDescriptor>>>>,
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},
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// TODO: Remove this once openat is implemented, or allow openat-via-dup via e.g. the top-level
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// directory.
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OpenViaDup,
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SchedAffinity,
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MmapMinAddr(Arc<AddrSpaceWrapper>),
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}
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#[derive(Clone)]
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struct Handle {
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context: Arc<RwSpinlock<Context>>,
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kind: ContextHandle,
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}
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pub struct ProcScheme;
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static NEXT_ID: AtomicUsize = AtomicUsize::new(1);
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// Using BTreeMap as hashbrown doesn't have a const constructor.
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static HANDLES: RwLock<BTreeMap<usize, Handle>> = RwLock::new(BTreeMap::new());
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#[cfg(feature = "debugger")]
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#[allow(dead_code)]
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pub fn foreach_addrsp(mut f: impl FnMut(&Arc<AddrSpaceWrapper>)) {
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for (_, handle) in HANDLES.read().iter() {
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let Handle {
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kind: ContextHandle::AddrSpace { addrspace, .. },
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..
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} = handle
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else {
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continue;
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};
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f(&addrspace);
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}
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}
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fn new_handle((handle, fl): (Handle, InternalFlags)) -> Result<(usize, InternalFlags)> {
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let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
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let _ = HANDLES.write().insert(id, handle);
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Ok((id, fl))
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}
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enum OpenTy {
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Ctxt(Arc<RwSpinlock<Context>>),
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Auth,
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}
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impl ProcScheme {
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fn openat_context(
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&self,
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path: &str,
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context: Arc<RwSpinlock<Context>>,
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) -> Result<Option<(ContextHandle, bool)>> {
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Ok(Some(match path {
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"addrspace" => (
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ContextHandle::AddrSpace {
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addrspace: Arc::clone(
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context
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.read()
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.addr_space()
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.map_err(|_| Error::new(ENOENT))?,
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),
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},
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true,
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),
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"filetable" => (
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ContextHandle::Filetable {
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filetable: Arc::downgrade(&context.read().files),
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data: Box::new([]),
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},
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true,
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),
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"current-addrspace" => (ContextHandle::CurrentAddrSpace, false),
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"current-filetable" => (ContextHandle::CurrentFiletable, false),
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"regs/float" => (ContextHandle::Regs(RegsKind::Float), false),
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"regs/int" => (ContextHandle::Regs(RegsKind::Int), false),
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"regs/env" => (ContextHandle::Regs(RegsKind::Env), false),
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"sighandler" => (ContextHandle::Sighandler, false),
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"start" => (ContextHandle::Start, false),
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"open_via_dup" => (ContextHandle::OpenViaDup, false),
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"mmap-min-addr" => (
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ContextHandle::MmapMinAddr(Arc::clone(
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context
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.read()
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.addr_space()
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.map_err(|_| Error::new(ENOENT))?,
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)),
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false,
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),
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"sched-affinity" => (ContextHandle::SchedAffinity, true),
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"status" => (ContextHandle::Status { privileged: false }, false),
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_ if path.starts_with("auth-") => {
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let nonprefix = &path["auth-".len()..];
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let next_dash = nonprefix.find('-').ok_or(Error::new(ENOENT))?;
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let auth_fd = nonprefix[..next_dash]
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.parse::<usize>()
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.map_err(|_| Error::new(ENOENT))?;
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let actual_name = &nonprefix[next_dash + 1..];
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let handle = match actual_name {
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"attrs" => ContextHandle::Attr,
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"status" => ContextHandle::Status { privileged: true },
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_ => return Err(Error::new(ENOENT)),
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};
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let (hopefully_this_scheme, number) = extract_scheme_number(auth_fd)?;
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verify_scheme(hopefully_this_scheme)?;
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if !matches!(
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HANDLES.read().get(&number).ok_or(Error::new(ENOENT))?.kind,
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ContextHandle::Authority
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) {
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return Err(Error::new(ENOENT));
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}
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(handle, false)
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}
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_ => return Ok(None),
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}))
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}
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fn open_inner(
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&self,
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ty: OpenTy,
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operation_str: Option<&str>,
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_flags: usize,
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) -> Result<(usize, InternalFlags)> {
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let operation_name = operation_str.ok_or(Error::new(EINVAL))?;
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let (mut handle, positioned) = match ty {
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OpenTy::Ctxt(context) => {
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if let Some((kind, positioned)) =
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self.openat_context(operation_name, Arc::clone(&context))?
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{
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(Handle { context, kind }, positioned)
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} else {
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return Err(Error::new(EINVAL));
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}
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}
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OpenTy::Auth => {
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extern "C" fn ret() {}
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let context = match operation_str.ok_or(Error::new(ENOENT))? {
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"new-context" => {
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let id = NonZeroUsize::new(NEXT_ID.fetch_add(1, Ordering::Relaxed))
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.ok_or(Error::new(EMFILE))?;
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let context = context::spawn(true, Some(id), ret)?;
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HANDLES.write().insert(
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id.get(),
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Handle {
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context,
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kind: ContextHandle::OpenViaDup,
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},
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);
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return Ok((id.get(), InternalFlags::empty()));
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}
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"cur-context" => context::current(),
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_ => return Err(Error::new(ENOENT)),
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};
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(
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Handle {
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context,
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kind: ContextHandle::OpenViaDup,
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},
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false,
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)
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}
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};
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{
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let filetable_opt = match handle {
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Handle {
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kind:
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ContextHandle::Filetable {
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ref filetable,
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ref mut data,
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},
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..
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} => Some((filetable.upgrade().ok_or(Error::new(EOWNERDEAD))?, data)),
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Handle {
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kind:
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ContextHandle::NewFiletable {
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ref filetable,
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ref mut data,
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},
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..
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} => Some((Arc::clone(filetable), data)),
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_ => None,
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};
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if let Some((filetable, data)) = filetable_opt {
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*data = {
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use core::fmt::Write;
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let mut data = String::new();
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for index in filetable
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.read()
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.iter()
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.enumerate()
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.filter_map(|(idx, val)| val.as_ref().map(|_| idx))
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{
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writeln!(data, "{}", index).unwrap();
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}
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data.into_bytes().into_boxed_slice()
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};
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}
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};
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let (id, int_fl) = new_handle((
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handle.clone(),
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if positioned {
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InternalFlags::POSITIONED
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} else {
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InternalFlags::empty()
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},
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))?;
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Ok((id, int_fl))
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}
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}
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impl KernelScheme for ProcScheme {
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fn kopen(&self, path: &str, _flags: usize, _ctx: CallerCtx) -> Result<OpenResult> {
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if path != "authority" {
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return Err(Error::new(ENOENT));
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}
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static LOCK: AtomicBool = AtomicBool::new(false);
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if LOCK.swap(true, Ordering::Relaxed) {
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return Err(Error::new(EEXIST));
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}
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let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
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HANDLES.write().insert(
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id,
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Handle {
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// TODO: placeholder
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context: context::current(),
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kind: ContextHandle::Authority,
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},
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);
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Ok(OpenResult::SchemeLocal(id, InternalFlags::empty()))
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}
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fn fevent(&self, id: usize, _flags: EventFlags) -> Result<EventFlags> {
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let handles = HANDLES.read();
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let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
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match handle {
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_ => Ok(EventFlags::empty()),
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}
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}
|
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fn close(&self, id: usize) -> Result<()> {
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let handle = HANDLES.write().remove(&id).ok_or(Error::new(EBADF))?;
|
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|
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match handle {
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Handle {
|
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context,
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kind:
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ContextHandle::AwaitingAddrSpaceChange {
|
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new,
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new_sp,
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new_ip,
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},
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} => {
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let _ = try_stop_context(context, |context: &mut Context| {
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let regs = context.regs_mut().ok_or(Error::new(EBADFD))?;
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regs.set_instr_pointer(new_ip);
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regs.set_stack_pointer(new_sp);
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Ok(context.set_addr_space(Some(new)))
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})?;
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let _ = ptrace::send_event(crate::syscall::ptrace_event!(
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PTRACE_EVENT_ADDRSPACE_SWITCH,
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0
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));
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}
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Handle {
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kind: ContextHandle::AddrSpace { addrspace } | ContextHandle::MmapMinAddr(addrspace),
|
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..
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} => drop(addrspace),
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Handle {
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kind: ContextHandle::AwaitingFiletableChange { new_ft },
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context,
|
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} => {
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context.write().files = new_ft;
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}
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_ => (),
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}
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Ok(())
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}
|
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fn kfmap(
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&self,
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id: usize,
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dst_addr_space: &Arc<AddrSpaceWrapper>,
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map: &crate::syscall::data::Map,
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consume: bool,
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) -> Result<usize> {
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let handle = HANDLES.read().get(&id).ok_or(Error::new(EBADF))?.clone();
|
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let Handle { kind, ref context } = handle;
|
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|
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match kind {
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ContextHandle::AddrSpace { ref addrspace } => {
|
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if Arc::ptr_eq(addrspace, dst_addr_space) {
|
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return Err(Error::new(EBUSY));
|
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}
|
|
|
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let PageSpan {
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base: requested_dst_page,
|
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..
|
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} = crate::syscall::validate_region(map.address, map.size)?;
|
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let src_span =
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PageSpan::validate_nonempty(VirtualAddress::new(map.offset), map.size)
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.ok_or(Error::new(EINVAL))?;
|
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|
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let requested_dst_base = (map.address != 0).then_some(requested_dst_page);
|
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|
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let mut src_addr_space = addrspace.acquire_write();
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|
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let src_page_count = NonZeroUsize::new(src_span.count).ok_or(Error::new(EINVAL))?;
|
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|
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let mut notify_files = Vec::new();
|
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|
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// TODO: Validate flags
|
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let result_base = if consume {
|
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dst_addr_space.r#move(
|
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Some((&addrspace, &mut *src_addr_space)),
|
|
src_span,
|
|
requested_dst_base,
|
|
src_page_count.get(),
|
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map.flags,
|
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&mut notify_files,
|
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)?
|
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} else {
|
|
let mut dst_addrsp_guard = dst_addr_space.acquire_write();
|
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dst_addrsp_guard.mmap(
|
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&dst_addr_space,
|
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requested_dst_base,
|
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src_page_count,
|
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map.flags,
|
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&mut notify_files,
|
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|dst_page, _, dst_mapper, flusher| {
|
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Ok(Grant::borrow(
|
|
Arc::clone(addrspace),
|
|
&mut *src_addr_space,
|
|
src_span.base,
|
|
dst_page,
|
|
src_span.count,
|
|
map.flags,
|
|
dst_mapper,
|
|
flusher,
|
|
true,
|
|
true,
|
|
false,
|
|
)?)
|
|
},
|
|
)?
|
|
};
|
|
|
|
handle_notify_files(notify_files);
|
|
|
|
Ok(result_base.start_address().data())
|
|
}
|
|
ContextHandle::Sighandler => {
|
|
let context = context.read();
|
|
let sig = context.sig.as_ref().ok_or(Error::new(EBADF))?;
|
|
let frame = match map.offset {
|
|
// tctl
|
|
0 => &sig.thread_control,
|
|
// pctl
|
|
PAGE_SIZE => &sig.proc_control,
|
|
_ => return Err(Error::new(EINVAL)),
|
|
};
|
|
let info = get_page_info(frame.get()).ok_or(Error::new(EBADFD))?;
|
|
match info.add_ref(RefKind::Shared) {
|
|
Ok(()) => (),
|
|
Err(AddRefError::RcOverflow) => return Err(Error::new(ENOMEM)),
|
|
Err(AddRefError::CowToShared) => unreachable!("cannot be CoW since it's a kernel RaiiFrame that at some point was made Shared"),
|
|
Err(AddRefError::SharedToCow) => unreachable!("wasn't requested"),
|
|
}
|
|
// TODO: Allocated or AllocatedShared?
|
|
let addrsp = AddrSpace::current()?;
|
|
let page = addrsp.acquire_write().mmap(
|
|
&addrsp,
|
|
None,
|
|
NonZeroUsize::new(1).unwrap(),
|
|
MapFlags::PROT_READ | MapFlags::PROT_WRITE,
|
|
&mut Vec::new(),
|
|
|page, flags, mapper, flusher| {
|
|
Grant::allocated_shared_one_page(
|
|
frame.get(),
|
|
page,
|
|
flags,
|
|
mapper,
|
|
flusher,
|
|
false,
|
|
)
|
|
},
|
|
)?;
|
|
Ok(page.start_address().data())
|
|
}
|
|
_ => Err(Error::new(EBADF)),
|
|
}
|
|
}
|
|
fn kreadoff(
|
|
&self,
|
|
id: usize,
|
|
buf: UserSliceWo,
|
|
offset: u64,
|
|
_read_flags: u32,
|
|
_stored_flags: u32,
|
|
) -> Result<usize> {
|
|
// Don't hold a global lock during the context switch later on
|
|
let handle = {
|
|
let handles = HANDLES.read();
|
|
handles.get(&id).ok_or(Error::new(EBADF))?.clone()
|
|
};
|
|
|
|
match handle {
|
|
Handle { context, kind } => kind.kreadoff(id, context, buf, offset),
|
|
}
|
|
}
|
|
fn kcall(
|
|
&self,
|
|
id: usize,
|
|
_payload: UserSliceRw,
|
|
_flags: CallFlags,
|
|
metadata: &[u64],
|
|
) -> Result<usize> {
|
|
// TODO: simplify
|
|
let handle = {
|
|
let mut handles = HANDLES.write();
|
|
let handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
|
|
handle.clone()
|
|
};
|
|
|
|
let ContextHandle::OpenViaDup = handle.kind else {
|
|
return Err(Error::new(EBADF));
|
|
};
|
|
|
|
let verb: u8 = (*metadata.get(0).ok_or(Error::new(EINVAL))?)
|
|
.try_into()
|
|
.map_err(|_| Error::new(EINVAL))?;
|
|
let verb = ProcSchemeVerb::try_from_raw(verb).ok_or(Error::new(EINVAL))?;
|
|
|
|
match verb {
|
|
ProcSchemeVerb::Iopl => context::current().write().set_userspace_io_allowed(true),
|
|
}
|
|
Ok(0)
|
|
}
|
|
fn kwriteoff(
|
|
&self,
|
|
id: usize,
|
|
buf: UserSliceRo,
|
|
_offset: u64,
|
|
_fcntl_flags: u32,
|
|
_stored_flags: u32,
|
|
) -> Result<usize> {
|
|
// TODO: offset
|
|
|
|
// Don't hold a global lock during the context switch later on
|
|
let handle = {
|
|
let mut handles = HANDLES.write();
|
|
let handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
|
|
handle.clone()
|
|
};
|
|
|
|
match handle {
|
|
Handle { context, kind } => kind.kwriteoff(id, context, buf),
|
|
}
|
|
}
|
|
fn kfstat(&self, id: usize, buffer: UserSliceWo) -> Result<()> {
|
|
let handles = HANDLES.read();
|
|
let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
|
|
|
|
buffer.copy_exactly(&Stat {
|
|
st_mode: MODE_FILE | 0o666,
|
|
st_size: handle.fsize()?,
|
|
|
|
..Stat::default()
|
|
})?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn fsize(&self, id: usize) -> Result<u64> {
|
|
let mut handles = HANDLES.write();
|
|
let handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
|
|
|
|
handle.fsize()
|
|
}
|
|
|
|
/// Dup is currently used to implement clone() and execve().
|
|
fn kdup(&self, old_id: usize, raw_buf: UserSliceRo, _: CallerCtx) -> Result<OpenResult> {
|
|
let info = {
|
|
let handles = HANDLES.read();
|
|
let handle = handles.get(&old_id).ok_or(Error::new(EBADF))?;
|
|
|
|
handle.clone()
|
|
};
|
|
|
|
let handle = |h, positioned| {
|
|
(
|
|
h,
|
|
if positioned {
|
|
InternalFlags::POSITIONED
|
|
} else {
|
|
InternalFlags::empty()
|
|
},
|
|
)
|
|
};
|
|
let mut array = [0_u8; 64];
|
|
if raw_buf.len() > array.len() {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
raw_buf.copy_to_slice(&mut array[..raw_buf.len()])?;
|
|
let buf = &array[..raw_buf.len()];
|
|
|
|
new_handle(match info {
|
|
Handle {
|
|
kind: ContextHandle::Authority,
|
|
..
|
|
} => {
|
|
return self
|
|
.open_inner(
|
|
OpenTy::Auth,
|
|
Some(core::str::from_utf8(buf).map_err(|_| Error::new(EINVAL))?)
|
|
.filter(|s| !s.is_empty()),
|
|
O_RDWR | O_CLOEXEC,
|
|
)
|
|
.map(|(r, fl)| OpenResult::SchemeLocal(r, fl))
|
|
}
|
|
Handle {
|
|
kind: ContextHandle::OpenViaDup,
|
|
context,
|
|
} => {
|
|
return self
|
|
.open_inner(
|
|
OpenTy::Ctxt(context),
|
|
Some(core::str::from_utf8(buf).map_err(|_| Error::new(EINVAL))?)
|
|
.filter(|s| !s.is_empty()),
|
|
O_RDWR | O_CLOEXEC,
|
|
)
|
|
.map(|(r, fl)| OpenResult::SchemeLocal(r, fl));
|
|
}
|
|
|
|
Handle {
|
|
kind:
|
|
ContextHandle::Filetable {
|
|
ref filetable,
|
|
ref data,
|
|
},
|
|
context,
|
|
} => {
|
|
// TODO: Maybe allow userspace to either copy or transfer recently dupped file
|
|
// descriptors between file tables.
|
|
if buf != b"copy" {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
let filetable = filetable.upgrade().ok_or(Error::new(EOWNERDEAD))?;
|
|
|
|
let new_filetable = Arc::try_new(RwLock::new(filetable.read().clone()))
|
|
.map_err(|_| Error::new(ENOMEM))?;
|
|
|
|
handle(
|
|
Handle {
|
|
kind: ContextHandle::NewFiletable {
|
|
filetable: new_filetable,
|
|
data: data.clone(),
|
|
},
|
|
context,
|
|
},
|
|
true,
|
|
)
|
|
}
|
|
Handle {
|
|
kind: ContextHandle::AddrSpace { ref addrspace },
|
|
context,
|
|
} => {
|
|
const GRANT_FD_PREFIX: &[u8] = b"grant-fd-";
|
|
|
|
let kind = match buf {
|
|
// TODO: Better way to obtain new empty address spaces, perhaps using SYS_OPEN. But
|
|
// in that case, what scheme?
|
|
b"empty" => ContextHandle::AddrSpace {
|
|
addrspace: AddrSpaceWrapper::new()?,
|
|
},
|
|
b"exclusive" => ContextHandle::AddrSpace {
|
|
addrspace: addrspace.try_clone()?,
|
|
},
|
|
b"mmap-min-addr" => ContextHandle::MmapMinAddr(Arc::clone(addrspace)),
|
|
|
|
_ if buf.starts_with(GRANT_FD_PREFIX) => {
|
|
let string = core::str::from_utf8(&buf[GRANT_FD_PREFIX.len()..])
|
|
.map_err(|_| Error::new(EINVAL))?;
|
|
let page_addr =
|
|
usize::from_str_radix(string, 16).map_err(|_| Error::new(EINVAL))?;
|
|
|
|
if page_addr % PAGE_SIZE != 0 {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
|
|
let page = Page::containing_address(VirtualAddress::new(page_addr));
|
|
|
|
match addrspace
|
|
.acquire_read()
|
|
.grants
|
|
.contains(page)
|
|
.ok_or(Error::new(EINVAL))?
|
|
{
|
|
(_, info) => {
|
|
return Ok(OpenResult::External(
|
|
info.file_ref()
|
|
.map(|r| Arc::clone(&r.description))
|
|
.ok_or(Error::new(EBADF))?,
|
|
))
|
|
}
|
|
}
|
|
}
|
|
|
|
_ => return Err(Error::new(EINVAL)),
|
|
};
|
|
|
|
handle(Handle { context, kind }, true)
|
|
}
|
|
_ => return Err(Error::new(EINVAL)),
|
|
})
|
|
.map(|(r, fl)| OpenResult::SchemeLocal(r, fl))
|
|
}
|
|
}
|
|
fn extract_scheme_number(fd: usize) -> Result<(KernelSchemes, usize)> {
|
|
let (scheme_id, number) = match &*context::current()
|
|
.read()
|
|
.get_file(FileHandle::from(fd))
|
|
.ok_or(Error::new(EBADF))?
|
|
.description
|
|
.read()
|
|
{
|
|
desc => (desc.scheme, desc.number),
|
|
};
|
|
let scheme = scheme::schemes()
|
|
.get(scheme_id)
|
|
.ok_or(Error::new(ENODEV))?
|
|
.clone();
|
|
|
|
Ok((scheme, number))
|
|
}
|
|
fn verify_scheme(scheme: KernelSchemes) -> Result<()> {
|
|
if !matches!(scheme, KernelSchemes::Global(GlobalSchemes::Proc)) {
|
|
return Err(Error::new(EBADF));
|
|
}
|
|
Ok(())
|
|
}
|
|
impl Handle {
|
|
fn fsize(&self) -> Result<u64> {
|
|
match self.kind {
|
|
ContextHandle::Filetable { ref data, .. }
|
|
| ContextHandle::NewFiletable { ref data, .. } => Ok(data.len() as u64),
|
|
_ => Ok(0),
|
|
}
|
|
}
|
|
}
|
|
impl ContextHandle {
|
|
fn kwriteoff(
|
|
self,
|
|
id: usize,
|
|
context: Arc<RwSpinlock<Context>>,
|
|
buf: UserSliceRo,
|
|
) -> Result<usize> {
|
|
match self {
|
|
Self::AddrSpace { addrspace } => {
|
|
let mut chunks = buf.usizes();
|
|
let mut words_read = 0;
|
|
let mut next = || {
|
|
words_read += 1;
|
|
chunks.next().ok_or(Error::new(EINVAL))
|
|
};
|
|
|
|
match next()?? {
|
|
op @ ADDRSPACE_OP_MMAP | op @ ADDRSPACE_OP_TRANSFER => {
|
|
let fd = next()??;
|
|
let offset = next()??;
|
|
let page_span = crate::syscall::validate_region(next()??, next()??)?;
|
|
let flags = MapFlags::from_bits(next()??).ok_or(Error::new(EINVAL))?;
|
|
|
|
if !flags.contains(MapFlags::MAP_FIXED) {
|
|
return Err(Error::new(EOPNOTSUPP));
|
|
}
|
|
|
|
let (scheme, number) = extract_scheme_number(fd)?;
|
|
|
|
scheme.kfmap(
|
|
number,
|
|
&addrspace,
|
|
&Map {
|
|
offset,
|
|
size: page_span.count * PAGE_SIZE,
|
|
address: page_span.base.start_address().data(),
|
|
flags,
|
|
},
|
|
op == ADDRSPACE_OP_TRANSFER,
|
|
)?;
|
|
}
|
|
ADDRSPACE_OP_MUNMAP => {
|
|
let page_span = crate::syscall::validate_region(next()??, next()??)?;
|
|
|
|
let unpin = false;
|
|
addrspace.munmap(page_span, unpin)?;
|
|
}
|
|
ADDRSPACE_OP_MPROTECT => {
|
|
let page_span = crate::syscall::validate_region(next()??, next()??)?;
|
|
let flags = MapFlags::from_bits(next()??).ok_or(Error::new(EINVAL))?;
|
|
|
|
addrspace.mprotect(page_span, flags)?;
|
|
}
|
|
_ => return Err(Error::new(EINVAL)),
|
|
}
|
|
Ok(words_read * mem::size_of::<usize>())
|
|
}
|
|
ContextHandle::Regs(kind) => match kind {
|
|
RegsKind::Float => {
|
|
let regs = unsafe { buf.read_exact::<FloatRegisters>()? };
|
|
|
|
try_stop_context(context, |context| {
|
|
// NOTE: The kernel will never touch floats
|
|
|
|
// Ignore the rare case of floating point
|
|
// registers being uninitiated
|
|
let _ = context.set_fx_regs(regs);
|
|
|
|
Ok(mem::size_of::<FloatRegisters>())
|
|
})
|
|
}
|
|
RegsKind::Int => {
|
|
let regs = unsafe { buf.read_exact::<IntRegisters>()? };
|
|
|
|
try_stop_context(context, |context| match context.regs_mut() {
|
|
None => {
|
|
println!(
|
|
"{}:{}: Couldn't read registers from stopped process",
|
|
file!(),
|
|
line!()
|
|
);
|
|
Err(Error::new(ENOTRECOVERABLE))
|
|
}
|
|
Some(stack) => {
|
|
stack.load(®s);
|
|
|
|
Ok(mem::size_of::<IntRegisters>())
|
|
}
|
|
})
|
|
}
|
|
RegsKind::Env => {
|
|
let regs = unsafe { buf.read_exact::<EnvRegisters>()? };
|
|
write_env_regs(context, regs)?;
|
|
Ok(mem::size_of::<EnvRegisters>())
|
|
}
|
|
},
|
|
ContextHandle::Sighandler => {
|
|
let data = unsafe { buf.read_exact::<SetSighandlerData>()? };
|
|
|
|
if data.user_handler >= crate::USER_END_OFFSET
|
|
|| data.excp_handler >= crate::USER_END_OFFSET
|
|
{
|
|
return Err(Error::new(EPERM));
|
|
}
|
|
if data.thread_control_addr >= crate::USER_END_OFFSET
|
|
|| data.proc_control_addr >= crate::USER_END_OFFSET
|
|
{
|
|
return Err(Error::new(EFAULT));
|
|
}
|
|
|
|
let state = if data.thread_control_addr != 0 && data.proc_control_addr != 0 {
|
|
let validate_off = |addr, sz| {
|
|
let off = addr % PAGE_SIZE;
|
|
if off % mem::align_of::<usize>() == 0 && off + sz <= PAGE_SIZE {
|
|
Ok(off as u16)
|
|
} else {
|
|
Err(Error::new(EINVAL))
|
|
}
|
|
};
|
|
|
|
let addrsp = Arc::clone(context.read().addr_space()?);
|
|
|
|
Some(SignalState {
|
|
threadctl_off: validate_off(
|
|
data.thread_control_addr,
|
|
mem::size_of::<Sigcontrol>(),
|
|
)?,
|
|
procctl_off: validate_off(
|
|
data.proc_control_addr,
|
|
mem::size_of::<SigProcControl>(),
|
|
)?,
|
|
user_handler: NonZeroUsize::new(data.user_handler)
|
|
.ok_or(Error::new(EINVAL))?,
|
|
excp_handler: NonZeroUsize::new(data.excp_handler),
|
|
thread_control: addrsp.borrow_frame_enforce_rw_allocated(
|
|
Page::containing_address(VirtualAddress::new(data.thread_control_addr)),
|
|
)?,
|
|
proc_control: addrsp.borrow_frame_enforce_rw_allocated(
|
|
Page::containing_address(VirtualAddress::new(data.proc_control_addr)),
|
|
)?,
|
|
})
|
|
} else {
|
|
None
|
|
};
|
|
|
|
context.write().sig = state;
|
|
|
|
Ok(mem::size_of::<SetSighandlerData>())
|
|
}
|
|
ContextHandle::Start => match context.write().status {
|
|
ref mut status @ Status::HardBlocked {
|
|
reason: HardBlockedReason::NotYetStarted,
|
|
} => {
|
|
*status = Status::Runnable;
|
|
Ok(buf.len())
|
|
}
|
|
_ => return Err(Error::new(EINVAL)),
|
|
},
|
|
ContextHandle::Filetable { .. } | ContextHandle::NewFiletable { .. } => {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
|
|
ContextHandle::CurrentFiletable => {
|
|
let filetable_fd = buf.read_usize()?;
|
|
let (hopefully_this_scheme, number) = extract_scheme_number(filetable_fd)?;
|
|
verify_scheme(hopefully_this_scheme)?;
|
|
|
|
let mut handles = HANDLES.write();
|
|
let Entry::Occupied(mut entry) = handles.entry(number) else {
|
|
return Err(Error::new(EBADF));
|
|
};
|
|
let filetable = match *entry.get_mut() {
|
|
Handle {
|
|
kind: ContextHandle::Filetable { ref filetable, .. },
|
|
..
|
|
} => filetable.upgrade().ok_or(Error::new(EOWNERDEAD))?,
|
|
Handle {
|
|
kind:
|
|
ContextHandle::NewFiletable {
|
|
ref filetable,
|
|
ref data,
|
|
},
|
|
..
|
|
} => {
|
|
let ft = Arc::clone(&filetable);
|
|
*entry.get_mut() = Handle {
|
|
kind: ContextHandle::Filetable {
|
|
filetable: Arc::downgrade(&filetable),
|
|
data: data.clone(),
|
|
},
|
|
context: Arc::clone(&context),
|
|
};
|
|
ft
|
|
}
|
|
|
|
_ => return Err(Error::new(EBADF)),
|
|
};
|
|
|
|
*handles.get_mut(&id).ok_or(Error::new(EBADF))? = Handle {
|
|
kind: ContextHandle::AwaitingFiletableChange { new_ft: filetable },
|
|
context,
|
|
};
|
|
|
|
Ok(mem::size_of::<usize>())
|
|
}
|
|
ContextHandle::CurrentAddrSpace { .. } => {
|
|
let mut iter = buf.usizes();
|
|
let addrspace_fd = iter.next().ok_or(Error::new(EINVAL))??;
|
|
let sp = iter.next().ok_or(Error::new(EINVAL))??;
|
|
let ip = iter.next().ok_or(Error::new(EINVAL))??;
|
|
|
|
let (hopefully_this_scheme, number) = extract_scheme_number(addrspace_fd)?;
|
|
verify_scheme(hopefully_this_scheme)?;
|
|
|
|
let mut handles = HANDLES.write();
|
|
let Handle {
|
|
kind: ContextHandle::AddrSpace { ref addrspace },
|
|
..
|
|
} = handles.get(&number).ok_or(Error::new(EBADF))?
|
|
else {
|
|
return Err(Error::new(EBADF));
|
|
};
|
|
|
|
*handles.get_mut(&id).ok_or(Error::new(EBADF))? = Handle {
|
|
context,
|
|
kind: Self::AwaitingAddrSpaceChange {
|
|
new: Arc::clone(addrspace),
|
|
new_sp: sp,
|
|
new_ip: ip,
|
|
},
|
|
};
|
|
|
|
Ok(3 * mem::size_of::<usize>())
|
|
}
|
|
Self::MmapMinAddr(ref addrspace) => {
|
|
let val = buf.read_usize()?;
|
|
if val % PAGE_SIZE != 0 || val > crate::USER_END_OFFSET {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
addrspace.acquire_write().mmap_min = val;
|
|
Ok(mem::size_of::<usize>())
|
|
}
|
|
Self::SchedAffinity => {
|
|
let mask = unsafe { buf.read_exact::<crate::cpu_set::RawMask>()? };
|
|
|
|
context.write().sched_affinity.override_from(&mask);
|
|
|
|
Ok(mem::size_of_val(&mask))
|
|
}
|
|
ContextHandle::Status { privileged } => {
|
|
let mut args = buf.usizes();
|
|
|
|
let user_data = args.next().ok_or(Error::new(EINVAL))??;
|
|
|
|
let context_verb =
|
|
ContextVerb::try_from_raw(user_data).ok_or(Error::new(EINVAL))?;
|
|
|
|
match context_verb {
|
|
// TODO: lwp_park/lwp_unpark for bypassing procmgr?
|
|
ContextVerb::Unstop | ContextVerb::Stop if !privileged => {
|
|
return Err(Error::new(EPERM))
|
|
}
|
|
ContextVerb::Stop => {
|
|
let mut guard = context.write();
|
|
|
|
match guard.status {
|
|
Status::Dead { .. } => return Err(Error::new(EOWNERDEAD)),
|
|
Status::HardBlocked {
|
|
reason: HardBlockedReason::AwaitingMmap { .. },
|
|
} => todo!(),
|
|
_ => (),
|
|
}
|
|
guard.status = Status::HardBlocked {
|
|
reason: HardBlockedReason::Stopped,
|
|
};
|
|
// TODO: wait for context to be switched away from, and/or IPI?
|
|
Ok(size_of::<usize>())
|
|
}
|
|
ContextVerb::Unstop => {
|
|
let mut guard = context.write();
|
|
|
|
if let Status::HardBlocked {
|
|
reason: HardBlockedReason::Stopped,
|
|
} = guard.status
|
|
{
|
|
guard.status = Status::Runnable;
|
|
}
|
|
Ok(size_of::<usize>())
|
|
}
|
|
ContextVerb::Interrupt => {
|
|
let mut guard = context.write();
|
|
guard.unblock();
|
|
Ok(size_of::<usize>())
|
|
}
|
|
ContextVerb::ForceKill => {
|
|
if context::is_current(&context) {
|
|
//log::trace!("FORCEKILL SELF {} {}", context.read().debug_id, context.read().pid);
|
|
|
|
// The following functionality simplifies the cleanup step when detached threads
|
|
// terminate.
|
|
if let Some(post_unmap) = args.next() {
|
|
let base = post_unmap?;
|
|
let size = args.next().ok_or(Error::new(EINVAL))??;
|
|
|
|
if size > 0 {
|
|
let addrsp = Arc::clone(context.read().addr_space()?);
|
|
let res = addrsp.munmap(
|
|
PageSpan::validate_nonempty(
|
|
VirtualAddress::new(base),
|
|
size,
|
|
)
|
|
.ok_or(Error::new(EINVAL))?,
|
|
false,
|
|
)?;
|
|
for r in res {
|
|
let _ = r.unmap();
|
|
}
|
|
}
|
|
}
|
|
crate::syscall::exit_this_context(None);
|
|
} else {
|
|
let mut ctxt = context.write();
|
|
//log::trace!("FORCEKILL NONSELF={} {}, SELF={}", ctxt.debug_id, ctxt.pid, context::current().read().debug_id);
|
|
ctxt.status = context::Status::Runnable;
|
|
ctxt.being_sigkilled = true;
|
|
Ok(mem::size_of::<usize>())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ContextHandle::Attr => {
|
|
let info = unsafe { buf.read_exact::<ProcSchemeAttrs>()? };
|
|
let mut guard = context.write();
|
|
|
|
let len = info
|
|
.debug_name
|
|
.iter()
|
|
.position(|c| *c == 0)
|
|
.unwrap_or(info.debug_name.len())
|
|
.min(guard.name.capacity());
|
|
let debug_name = core::str::from_utf8(&info.debug_name[..len])
|
|
.map_err(|_| Error::new(EINVAL))?;
|
|
guard.name.clear();
|
|
guard.name.push_str(debug_name);
|
|
|
|
guard.pid = info.pid as usize;
|
|
guard.ens = (info.ens as usize).into();
|
|
guard.euid = info.euid;
|
|
guard.egid = info.egid;
|
|
Ok(size_of::<ProcSchemeAttrs>())
|
|
}
|
|
_ => Err(Error::new(EBADF)),
|
|
}
|
|
}
|
|
fn kreadoff(
|
|
&self,
|
|
_id: usize,
|
|
context: Arc<RwSpinlock<Context>>,
|
|
buf: UserSliceWo,
|
|
offset: u64,
|
|
) -> Result<usize> {
|
|
match self {
|
|
ContextHandle::Regs(kind) => {
|
|
union Output {
|
|
float: FloatRegisters,
|
|
int: IntRegisters,
|
|
env: EnvRegisters,
|
|
}
|
|
|
|
let (output, size) = match kind {
|
|
RegsKind::Float => {
|
|
let context = context.read();
|
|
// NOTE: The kernel will never touch floats
|
|
|
|
(
|
|
Output {
|
|
float: context.get_fx_regs(),
|
|
},
|
|
mem::size_of::<FloatRegisters>(),
|
|
)
|
|
}
|
|
RegsKind::Int => try_stop_context(context, |context| match context.regs() {
|
|
None => {
|
|
assert!(!context.running, "try_stop_context is broken, clearly");
|
|
println!(
|
|
"{}:{}: Couldn't read registers from stopped process",
|
|
file!(),
|
|
line!()
|
|
);
|
|
Err(Error::new(ENOTRECOVERABLE))
|
|
}
|
|
Some(stack) => {
|
|
let mut regs = IntRegisters::default();
|
|
stack.save(&mut regs);
|
|
Ok((Output { int: regs }, mem::size_of::<IntRegisters>()))
|
|
}
|
|
})?,
|
|
RegsKind::Env => (
|
|
Output {
|
|
env: read_env_regs(context)?,
|
|
},
|
|
mem::size_of::<EnvRegisters>(),
|
|
),
|
|
};
|
|
|
|
let src_buf =
|
|
unsafe { slice::from_raw_parts(&output as *const _ as *const u8, size) };
|
|
|
|
buf.copy_common_bytes_from_slice(src_buf)
|
|
}
|
|
ContextHandle::AddrSpace { ref addrspace } => {
|
|
let Ok(offset) = usize::try_from(offset) else {
|
|
return Ok(0);
|
|
};
|
|
let grants_to_skip = offset / mem::size_of::<GrantDesc>();
|
|
|
|
// Output a list of grant descriptors, sufficient to allow relibc's fork()
|
|
// implementation to fmap MAP_SHARED grants.
|
|
let mut grants_read = 0;
|
|
|
|
let mut dst = [GrantDesc::default(); 16];
|
|
|
|
for (dst, (grant_base, grant_info)) in dst
|
|
.iter_mut()
|
|
.zip(addrspace.acquire_read().grants.iter().skip(grants_to_skip))
|
|
{
|
|
*dst = GrantDesc {
|
|
base: grant_base.start_address().data(),
|
|
size: grant_info.page_count() * PAGE_SIZE,
|
|
flags: grant_info.grant_flags(),
|
|
// The !0 is not a sentinel value; the availability of `offset` is
|
|
// indicated by the GRANT_SCHEME flag.
|
|
offset: grant_info.file_ref().map_or(!0, |f| f.base_offset as u64),
|
|
};
|
|
grants_read += 1;
|
|
}
|
|
for (src, chunk) in dst
|
|
.iter()
|
|
.take(grants_read)
|
|
.zip(buf.in_exact_chunks(mem::size_of::<GrantDesc>()))
|
|
{
|
|
chunk.copy_exactly(src)?;
|
|
}
|
|
|
|
Ok(grants_read * mem::size_of::<GrantDesc>())
|
|
}
|
|
|
|
ContextHandle::Filetable { data, .. } => read_from(buf, &data, offset),
|
|
ContextHandle::MmapMinAddr(ref addrspace) => {
|
|
buf.write_usize(addrspace.acquire_read().mmap_min)?;
|
|
Ok(mem::size_of::<usize>())
|
|
}
|
|
ContextHandle::SchedAffinity => {
|
|
let mask = context.read().sched_affinity.to_raw();
|
|
|
|
buf.copy_exactly(crate::cpu_set::mask_as_bytes(&mask))?;
|
|
Ok(mem::size_of_val(&mask))
|
|
} // TODO: Replace write() with SYS_SENDFD?
|
|
ContextHandle::Status { .. } => {
|
|
let status = {
|
|
let context = context.read();
|
|
match context.status {
|
|
Status::Dead { excp: None } => ContextStatus::Dead,
|
|
Status::Runnable if context.being_sigkilled => ContextStatus::ForceKilled,
|
|
Status::Dead { excp: Some(excp) } => {
|
|
let (status, payload) =
|
|
buf.split_at(size_of::<usize>()).ok_or(Error::new(EINVAL))?;
|
|
status.copy_from_slice(
|
|
&(ContextStatus::UnhandledExcp as usize).to_ne_bytes(),
|
|
)?;
|
|
let len = payload.copy_common_bytes_from_slice(&excp)?;
|
|
return Ok(size_of::<usize>() + len);
|
|
}
|
|
Status::Runnable => ContextStatus::Runnable,
|
|
Status::Blocked => ContextStatus::Blocked,
|
|
Status::HardBlocked {
|
|
reason: HardBlockedReason::NotYetStarted,
|
|
} => ContextStatus::NotYetStarted,
|
|
Status::HardBlocked {
|
|
reason: HardBlockedReason::Stopped,
|
|
} => ContextStatus::Stopped,
|
|
_ => ContextStatus::Other,
|
|
}
|
|
};
|
|
buf.copy_common_bytes_from_slice(&(status as usize).to_ne_bytes())
|
|
}
|
|
ContextHandle::Attr => {
|
|
let mut debug_name = [0; 32];
|
|
let (euid, egid, ens, pid, name) = match context.read() {
|
|
ref c => (c.euid, c.egid, c.ens.get() as u32, c.pid as u32, c.name),
|
|
};
|
|
let min = name.len().min(debug_name.len());
|
|
debug_name[..min].copy_from_slice(&name.as_bytes()[..min]);
|
|
buf.copy_common_bytes_from_slice(&ProcSchemeAttrs {
|
|
pid,
|
|
euid,
|
|
egid,
|
|
ens,
|
|
debug_name,
|
|
})
|
|
}
|
|
ContextHandle::Sighandler => {
|
|
let data = match context.read().sig {
|
|
Some(ref sig) => SetSighandlerData {
|
|
excp_handler: sig.excp_handler.map_or(0, NonZeroUsize::get),
|
|
user_handler: sig.user_handler.get(),
|
|
proc_control_addr: sig.procctl_off.into(),
|
|
thread_control_addr: sig.threadctl_off.into(),
|
|
},
|
|
None => SetSighandlerData::default(),
|
|
};
|
|
buf.copy_common_bytes_from_slice(&data)
|
|
}
|
|
|
|
// TODO: Find a better way to switch address spaces, since they also require switching
|
|
// the instruction and stack pointer. Maybe remove `<pid>/regs` altogether and replace it
|
|
// with `<pid>/ctx`
|
|
_ => return Err(Error::new(EBADF)),
|
|
}
|
|
}
|
|
}
|
|
|
|
fn write_env_regs(context: Arc<RwSpinlock<Context>>, regs: EnvRegisters) -> Result<()> {
|
|
if context::is_current(&context) {
|
|
context::current().write().write_current_env_regs(regs)
|
|
} else {
|
|
try_stop_context(context, |context| context.write_env_regs(regs))
|
|
}
|
|
}
|
|
|
|
fn read_env_regs(context: Arc<RwSpinlock<Context>>) -> Result<EnvRegisters> {
|
|
if context::is_current(&context) {
|
|
context::current().read().read_current_env_regs()
|
|
} else {
|
|
try_stop_context(context, |context| context.read_env_regs())
|
|
}
|
|
}
|