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|
// Allow clippy lints when building without clippy.
#![allow(unknown_lints)]
use gimli::{AttributeValue, UnitHeader};
use object::{Object, ObjectSection};
use rayon::prelude::*;
use std::borrow::{Borrow, Cow};
use std::env;
use std::fs;
use std::io::{self, BufWriter, Write};
use std::iter::Iterator;
use std::path::{Path, PathBuf};
use std::process;
use std::sync::Mutex;
use typed_arena::Arena;
trait Reader: gimli::Reader<Offset = usize> + Send + Sync {
type SyncSendEndian: gimli::Endianity + Send + Sync;
}
impl<'input, Endian> Reader for gimli::EndianSlice<'input, Endian>
where
Endian: gimli::Endianity + Send + Sync,
{
type SyncSendEndian = Endian;
}
struct ErrorWriter<W: Write + Send> {
inner: Mutex<(W, usize)>,
path: PathBuf,
}
impl<W: Write + Send> ErrorWriter<W> {
#[allow(clippy::needless_pass_by_value)]
fn error(&self, s: String) {
let mut lock = self.inner.lock().unwrap();
writeln!(&mut lock.0, "DWARF error in {}: {}", self.path.display(), s).unwrap();
lock.1 += 1;
}
}
fn main() {
let mut w = BufWriter::new(io::stdout());
let mut errors = 0;
for arg in env::args_os().skip(1) {
let path = Path::new(&arg);
let file = match fs::File::open(&path) {
Ok(file) => file,
Err(err) => {
eprintln!("Failed to open file '{}': {}", path.display(), err);
errors += 1;
continue;
}
};
let file = match unsafe { memmap2::Mmap::map(&file) } {
Ok(mmap) => mmap,
Err(err) => {
eprintln!("Failed to map file '{}': {}", path.display(), &err);
errors += 1;
continue;
}
};
let file = match object::File::parse(&*file) {
Ok(file) => file,
Err(err) => {
eprintln!("Failed to parse file '{}': {}", path.display(), err);
errors += 1;
continue;
}
};
let endian = if file.is_little_endian() {
gimli::RunTimeEndian::Little
} else {
gimli::RunTimeEndian::Big
};
let mut error_writer = ErrorWriter {
inner: Mutex::new((&mut w, 0)),
path: path.to_owned(),
};
validate_file(&mut error_writer, &file, endian);
errors += error_writer.inner.into_inner().unwrap().1;
}
// Flush any errors.
drop(w);
if errors > 0 {
process::exit(1);
}
}
fn validate_file<W, Endian>(w: &mut ErrorWriter<W>, file: &object::File, endian: Endian)
where
W: Write + Send,
Endian: gimli::Endianity + Send + Sync,
{
let arena = Arena::new();
fn load_section<'a, 'file, 'input, S, Endian>(
arena: &'a Arena<Cow<'file, [u8]>>,
file: &'file object::File<'input>,
endian: Endian,
) -> S
where
S: gimli::Section<gimli::EndianSlice<'a, Endian>>,
Endian: gimli::Endianity + Send + Sync,
'file: 'input,
'a: 'file,
{
let data = match file.section_by_name(S::section_name()) {
Some(ref section) => section
.uncompressed_data()
.unwrap_or(Cow::Borrowed(&[][..])),
None => Cow::Borrowed(&[][..]),
};
let data_ref = (*arena.alloc(data)).borrow();
S::from(gimli::EndianSlice::new(data_ref, endian))
}
// Variables representing sections of the file. The type of each is inferred from its use in the
// validate_info function below.
let debug_abbrev = &load_section(&arena, file, endian);
let debug_info = &load_section(&arena, file, endian);
validate_info(w, debug_info, debug_abbrev);
}
struct UnitSummary {
// True if we successfully parsed all the DIEs and attributes in the compilation unit
internally_valid: bool,
offset: gimli::DebugInfoOffset,
die_offsets: Vec<gimli::UnitOffset>,
global_die_references: Vec<(gimli::UnitOffset, gimli::DebugInfoOffset)>,
}
fn validate_info<W, R>(
w: &mut ErrorWriter<W>,
debug_info: &gimli::DebugInfo<R>,
debug_abbrev: &gimli::DebugAbbrev<R>,
) where
W: Write + Send,
R: Reader,
{
let mut units = Vec::new();
let mut units_iter = debug_info.units();
let mut last_offset = 0;
loop {
let u = match units_iter.next() {
Err(err) => {
w.error(format!(
"Can't read unit header at offset {:#x}, stopping reading units: {}",
last_offset, err
));
break;
}
Ok(None) => break,
Ok(Some(u)) => u,
};
last_offset = u.offset().as_debug_info_offset().unwrap().0 + u.length_including_self();
units.push(u);
}
let process_unit = |unit: UnitHeader<R>| -> UnitSummary {
let unit_offset = unit.offset().as_debug_info_offset().unwrap();
let mut ret = UnitSummary {
internally_valid: false,
offset: unit_offset,
die_offsets: Vec::new(),
global_die_references: Vec::new(),
};
let abbrevs = match unit.abbreviations(debug_abbrev) {
Ok(abbrevs) => abbrevs,
Err(err) => {
w.error(format!(
"Invalid abbrevs for unit {:#x}: {}",
unit_offset.0, &err
));
return ret;
}
};
let mut entries = unit.entries(&abbrevs);
let mut unit_refs = Vec::new();
loop {
let (_, entry) = match entries.next_dfs() {
Err(err) => {
w.error(format!(
"Invalid DIE for unit {:#x}: {}",
unit_offset.0, &err
));
return ret;
}
Ok(None) => break,
Ok(Some(entry)) => entry,
};
ret.die_offsets.push(entry.offset());
let mut attrs = entry.attrs();
loop {
let attr = match attrs.next() {
Err(err) => {
w.error(format!(
"Invalid attribute for unit {:#x} at DIE {:#x}: {}",
unit_offset.0,
entry.offset().0,
&err
));
return ret;
}
Ok(None) => break,
Ok(Some(attr)) => attr,
};
match attr.value() {
AttributeValue::UnitRef(offset) => {
unit_refs.push((entry.offset(), offset));
}
AttributeValue::DebugInfoRef(offset) => {
ret.global_die_references.push((entry.offset(), offset));
}
_ => (),
}
}
}
ret.internally_valid = true;
ret.die_offsets.shrink_to_fit();
ret.global_die_references.shrink_to_fit();
// Check intra-unit references
for (from, to) in unit_refs {
if ret.die_offsets.binary_search(&to).is_err() {
w.error(format!(
"Invalid intra-unit reference in unit {:#x} from DIE {:#x} to {:#x}",
unit_offset.0, from.0, to.0
));
}
}
ret
};
let processed_units = units.into_par_iter().map(process_unit).collect::<Vec<_>>();
let check_unit = |summary: &UnitSummary| {
if !summary.internally_valid {
return;
}
for &(from, to) in summary.global_die_references.iter() {
let u = match processed_units.binary_search_by_key(&to, |v| v.offset) {
Ok(i) => &processed_units[i],
Err(i) => {
if i > 0 {
&processed_units[i - 1]
} else {
w.error(format!("Invalid cross-unit reference in unit {:#x} from DIE {:#x} to global DIE {:#x}: no unit found",
summary.offset.0, from.0, to.0));
continue;
}
}
};
if !u.internally_valid {
continue;
}
let to_offset = gimli::UnitOffset(to.0 - u.offset.0);
if u.die_offsets.binary_search(&to_offset).is_err() {
w.error(format!("Invalid cross-unit reference in unit {:#x} from DIE {:#x} to global DIE {:#x}: unit at {:#x} contains no DIE {:#x}",
summary.offset.0, from.0, to.0, u.offset.0, to_offset.0));
}
}
};
processed_units.par_iter().for_each(check_unit);
}
|
