elf_runner/
vdso_vmo.rs

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1// Copyright 2023 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use crate::error::VdsoError;
6use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
7use lazy_static::lazy_static;
8use std::collections::HashMap;
9use zx::{self as zx, AsHandleRef, HandleBased};
10
11fn take_vdso_vmos() -> Result<HashMap<zx::Name, zx::Vmo>, VdsoError> {
12    let mut vmos = HashMap::new();
13    let mut i = 0;
14    while let Some(handle) = take_startup_handle(HandleInfo::new(HandleType::VdsoVmo, i)) {
15        let vmo = zx::Vmo::from(handle);
16        let name = vmo.get_name().map_err(VdsoError::GetName)?;
17        vmos.insert(name, vmo);
18        i += 1;
19    }
20    Ok(vmos)
21}
22
23pub fn get_vdso_vmo(name: &zx::Name) -> Result<zx::Vmo, VdsoError> {
24    lazy_static! {
25        static ref VMOS: HashMap<zx::Name, zx::Vmo> =
26            take_vdso_vmos().expect("Failed to take vDSO VMOs");
27    }
28    if let Some(vmo) = VMOS.get(name) {
29        vmo.duplicate_handle(zx::Rights::SAME_RIGHTS)
30            .map_err(|status| VdsoError::CouldNotDuplicate { name: *name, status })
31    } else {
32        Err(VdsoError::NotFound(*name))
33    }
34}
35
36/// Returns an owned VMO handle to the stable vDSO, duplicated from the handle
37/// provided to this process through its processargs bootstrap message.
38pub fn get_stable_vdso_vmo() -> Result<zx::Vmo, VdsoError> {
39    get_vdso_vmo(&zx::Name::new_lossy("vdso/stable"))
40}
41
42/// Returns an owned VMO handle to the next vDSO, duplicated from the handle
43/// provided to this process through its processargs bootstrap message.
44pub fn get_next_vdso_vmo() -> Result<zx::Vmo, VdsoError> {
45    get_vdso_vmo(&zx::Name::new_lossy("vdso/next"))
46}
elf_runner/vdso_vmo.rs

elf_runner/
vdso_vmo.rs
