mirror of https://github.com/aya-rs/aya
Merge pull request #1160 from dave-tucker/modprobe
Dave Tucker
8 months ago
committed by
GitHub
commit
29f4f2b780
@ -0,0 +1,30 @@
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#!/usr/bin/env python3
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import os
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import glob
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import sys
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from typing import List
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def find_kernels(directory: str) -> List[str]:
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return glob.glob(f"{directory}/**/vmlinuz-*", recursive=True)
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def find_modules_directory(directory: str, kernel: str) -> str:
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matches = glob.glob(f"{directory}/**/modules/{kernel}", recursive=True)
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if len(matches) != 1:
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raise RuntimeError(f"Expected to find exactly one modules directory. Found {len(matches)}.")
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return matches[0]
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def main() -> None:
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images = find_kernels('test/.tmp')
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modules = []
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for image in images:
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image_name = os.path.basename(image).replace('vmlinuz-', '')
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module_dir = find_modules_directory('test/.tmp', image_name)
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modules.append(module_dir)
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args = ' '.join(f"{image}:{module}" for image, module in zip(images, modules))
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print(args)
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if __name__ == "__main__":
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main()
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@ -1,7 +1,8 @@
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{
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"rust-analyzer.check.allTargets": true,
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"rust-analyzer.check.command": "clippy",
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"search.exclude": {
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"/xtask/public-api/*.txt": true,
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},
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"rust-analyzer.check.allTargets": true,
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"rust-analyzer.check.command": "clippy",
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"search.exclude": {
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"/xtask/public-api/*.txt": true
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},
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"yaml.format.singleQuote": true
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}
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@ -1,18 +0,0 @@
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[package]
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name = "init"
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publish = false
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version = "0.1.0"
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authors.workspace = true
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edition.workspace = true
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homepage.workspace = true
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license.workspace = true
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repository.workspace = true
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rust-version.workspace = true
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[lints]
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workspace = true
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[dependencies]
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anyhow = { workspace = true, features = ["std"] }
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nix = { workspace = true, features = ["fs", "mount", "reboot"] }
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@ -0,0 +1,38 @@
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[package]
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name = "test-distro"
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publish = false
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version = "0.1.0"
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authors.workspace = true
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edition.workspace = true
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homepage.workspace = true
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license.workspace = true
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repository.workspace = true
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[[bin]]
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name = "init"
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path = "src/init.rs"
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[[bin]]
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name = "modprobe"
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path = "src/modprobe.rs"
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[[bin]]
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name = "depmod"
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path = "src/depmod.rs"
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[dependencies]
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anyhow = { workspace = true, features = ["std"] }
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clap = { workspace = true, default-features = true, features = ["derive"] }
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glob = { workspace = true }
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nix = { workspace = true, features = [
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"user",
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"fs",
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"mount",
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"reboot",
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"kmod",
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"feature",
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] }
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object = { workspace = true, features = ["elf", "read_core", "std"] }
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walkdir = { workspace = true }
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xz2 = { workspace = true }
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@ -0,0 +1,140 @@
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//! depmod is used to build the modules.alias file to assist with loading
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//! kernel modules.
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//!
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//! This implementation is incredibly naive and is only designed to work within
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//! the constraints of the test environment. Not for production use.
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use std::{
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fs::File,
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io::{BufWriter, Read, Write as _},
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path::PathBuf,
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};
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use anyhow::{Context as _, anyhow};
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use clap::Parser;
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use object::{Object, ObjectSection, ObjectSymbol, Section};
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use test_distro::resolve_modules_dir;
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use walkdir::WalkDir;
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use xz2::read::XzDecoder;
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#[derive(Parser)]
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struct Args {
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#[clap(long, short)]
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base_dir: Option<PathBuf>,
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}
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fn main() -> anyhow::Result<()> {
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let Args { base_dir } = Parser::parse();
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let modules_dir = if let Some(base_dir) = base_dir {
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base_dir
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} else {
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resolve_modules_dir().context("failed to resolve modules dir")?
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};
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let modules_alias = modules_dir.join("modules.alias");
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let f = std::fs::OpenOptions::new()
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.create(true)
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.write(true)
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.truncate(true)
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.open(&modules_alias)
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.with_context(|| format!("failed to open: {}", modules_alias.display()))?;
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let mut output = BufWriter::new(&f);
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for entry in WalkDir::new(modules_dir) {
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let entry = entry.context("failed to read entry in walkdir")?;
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if entry.file_type().is_file() {
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let path = entry.path();
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let module_name = path
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.file_name()
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.ok_or_else(|| anyhow!("{} does not have a file name", path.display()))?
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.to_str()
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.ok_or_else(|| anyhow!("{} is not valid utf-8", path.display()))?;
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let (module_name, compressed) =
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if let Some(module_name) = module_name.strip_suffix(".xz") {
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(module_name, true)
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} else {
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(module_name, false)
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};
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let module_name = if let Some(module_name) = module_name.strip_suffix(".ko") {
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module_name
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} else {
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// Not a kernel module
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continue;
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};
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let mut f =
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File::open(path).with_context(|| format!("failed to open: {}", path.display()))?;
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let stat = f
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.metadata()
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.with_context(|| format!("failed to get metadata for {}", path.display()))?;
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if compressed {
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let mut decoder = XzDecoder::new(f);
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// We don't know the size of the decompressed data, so we assume it's
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// no more than twice the size of the compressed data.
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let mut decompressed = Vec::with_capacity(stat.len() as usize * 2);
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decoder.read_to_end(&mut decompressed)?;
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read_aliases_from_module(&decompressed, module_name, &mut output)
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} else {
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let mut buf = Vec::with_capacity(stat.len() as usize);
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f.read_to_end(&mut buf)
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.with_context(|| format!("failed to read: {}", path.display()))?;
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read_aliases_from_module(&buf, module_name, &mut output)
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}
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.with_context(|| format!("failed to read aliases from module {}", path.display()))?;
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}
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}
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Ok(())
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}
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fn read_aliases_from_module(
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contents: &[u8],
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module_name: &str,
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output: &mut BufWriter<&File>,
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) -> Result<(), anyhow::Error> {
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let obj = object::read::File::parse(contents).context("failed to parse")?;
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let section = (|| -> anyhow::Result<Option<Section<'_, '_, &[u8]>>> {
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for s in obj.sections() {
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let name = s
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.name_bytes()
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.with_context(|| format!("failed to get name of section idx {}", s.index()))?;
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if name == b".modinfo" {
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return Ok(Some(s));
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}
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}
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Ok(None)
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})()?;
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let section = section.context("failed to find .modinfo section")?;
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let section_idx = section.index();
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let data = section
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.data()
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.context("failed to get modinfo section data")?;
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for s in obj.symbols() {
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if s.section_index() != Some(section_idx) {
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continue;
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}
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let name = s
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.name()
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.with_context(|| format!("failed to get name of symbol idx {}", s.index()))?;
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if name.contains("alias") {
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let start = s.address() as usize;
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let end = start + s.size() as usize;
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let sym_data = &data[start..end];
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let cstr = std::ffi::CStr::from_bytes_with_nul(sym_data)
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.with_context(|| format!("failed to convert {:?} to cstr", sym_data))?;
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let sym_str = cstr
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.to_str()
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.with_context(|| format!("failed to convert {:?} to str", cstr))?;
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let alias = sym_str
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.strip_prefix("alias=")
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.with_context(|| format!("failed to strip prefix 'alias=' from {}", sym_str))?;
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writeln!(output, "alias {} {}", alias, module_name).expect("write");
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}
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}
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Ok(())
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}
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@ -0,0 +1,30 @@
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use std::path::PathBuf;
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use anyhow::Context as _;
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use nix::sys::utsname::uname;
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/// Kernel modules are in `/lib/modules`.
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/// They may be in the root of this directory,
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/// or in subdirectory named after the kernel release.
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pub fn resolve_modules_dir() -> anyhow::Result<PathBuf> {
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let modules_dir = PathBuf::from("/lib/modules");
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let stat = modules_dir
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.metadata()
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.with_context(|| format!("stat(): {}", modules_dir.display()))?;
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if stat.is_dir() {
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return Ok(modules_dir);
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}
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let utsname = uname().context("uname()")?;
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let release = utsname.release();
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let modules_dir = modules_dir.join(release);
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let stat = modules_dir
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.metadata()
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.with_context(|| format!("stat(): {}", modules_dir.display()))?;
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anyhow::ensure!(
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stat.is_dir(),
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"{} is not a directory",
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modules_dir.display()
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);
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Ok(modules_dir)
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}
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@ -0,0 +1,140 @@
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//! modprobe is used to load kernel modules into the kernel.
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//!
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//! This implementation is incredibly naive and is only designed to work within
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//! the constraints of the test environment. Not for production use.
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use std::{
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fs::File,
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io::{BufRead as _, Read as _},
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path::Path,
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};
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use anyhow::{Context as _, anyhow, bail};
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use clap::Parser;
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use glob::glob;
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use nix::kmod::init_module;
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use test_distro::resolve_modules_dir;
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macro_rules! output {
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($quiet:expr, $($arg:tt)*) => {
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if !$quiet {
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println!($($arg)*);
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}
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};
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}
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#[derive(Parser)]
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struct Args {
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/// Suppress all output and don't return an error code.
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#[clap(short, long, default_value = "false")]
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quiet: bool,
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/// The name of the module to load.
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/// This can be either an alias like `net-sched-sch-ingress` or a module
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/// name like `sch_ingress`.
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name: String,
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}
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fn main() -> anyhow::Result<()> {
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let Args { quiet, name } = Parser::parse();
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let ret = try_main(quiet, name);
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if quiet { Ok(()) } else { ret }
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}
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fn try_main(quiet: bool, name: String) -> anyhow::Result<()> {
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let modules_dir = resolve_modules_dir()?;
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output!(quiet, "resolving alias for module: {}", name);
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let module = resolve_alias(quiet, &modules_dir, &name)?;
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let pattern = format!(
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"{}/kernel/**/{}.ko*",
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modules_dir
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.to_str()
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.ok_or_else(|| anyhow!("failed to convert {} to string", modules_dir.display()))?,
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module
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);
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let module_path = glob(&pattern)
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.with_context(|| format!("failed to glob: {}", pattern))?
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.next()
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.ok_or_else(|| anyhow!("module not found: {}", module))?
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.context("glob error")?;
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output!(quiet, "loading module: {}", module_path.display());
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let mut f =
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File::open(&module_path).with_context(|| format!("open(): {}", module_path.display()))?;
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let stat = f
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.metadata()
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.with_context(|| format!("stat(): {}", module_path.display()))?;
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let extension = module_path
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.as_path()
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.extension()
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.ok_or_else(|| anyhow!("module has no extension: {}", module_path.display()))?;
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let contents = if extension == "xz" {
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output!(quiet, "decompressing module");
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let mut decompressed = Vec::with_capacity(stat.len() as usize * 2);
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xz2::read::XzDecoder::new(f).read_to_end(&mut decompressed)?;
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decompressed
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} else {
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let mut contents: Vec<u8> = Vec::with_capacity(stat.len() as usize);
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f.read_to_end(&mut contents)?;
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contents
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};
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if !contents.starts_with(&[0x7f, 0x45, 0x4c, 0x46]) {
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bail!("module is not an valid ELF file");
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}
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match init_module(&contents, c"") {
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Ok(()) => {
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output!(quiet, "module loaded successfully");
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Ok(())
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}
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Err(e) => {
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if e == nix::errno::Errno::EEXIST {
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Err(anyhow!("module already loaded"))
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} else {
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Err(anyhow!("failed to load module: {}", e))
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}
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}
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}
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}
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fn resolve_alias(quiet: bool, module_dir: &Path, name: &str) -> anyhow::Result<String> {
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let modules_alias = module_dir.join("modules.alias");
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output!(
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quiet,
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"opening modules.alias file: {}",
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modules_alias.display()
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);
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let alias_file = File::open(&modules_alias)
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.with_context(|| format!("open(): {}", modules_alias.display()))?;
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let alias_file = std::io::BufReader::new(alias_file);
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for line in alias_file.lines() {
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let line = line?;
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if line.starts_with("alias ") {
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let mut parts = line.split_whitespace();
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let prefix = parts.next();
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if prefix != Some("alias") {
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bail!("alias line incorrect prefix: {}", line);
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}
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let alias = parts
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.next()
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.with_context(|| format!("alias line missing alias: {}", line))?;
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let module = parts
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.next()
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.with_context(|| format!("alias line missing module: {}", line))?;
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if parts.next().is_some() {
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bail!("alias line has too many parts: {}", line);
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}
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if alias == name {
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return Ok(module.to_string());
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}
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}
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}
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bail!("alias not found: {}", name)
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}
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