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a/fuzz/Cargo.toml b/fuzz/Cargo.toml new file mode 100644 index 00000000..e02d57ea --- /dev/null +++ b/fuzz/Cargo.toml @@ -0,0 +1,21 @@ +[package] +name = "py-spy-fuzz" +version = "0.0.0" +publish = false +edition = "2021" + +[package.metadata] +cargo-fuzz = true + +[dependencies] +libfuzzer-sys = "0.4" + +[dependencies.py-spy] +path = ".." + +[[bin]] +name = "fuzz_target_1" +path = "fuzz_targets/fuzz_target_1.rs" +test = false +doc = false +bench = false diff --git a/fuzz/fuzz_targets/fuzz_target_1.rs b/fuzz/fuzz_targets/fuzz_target_1.rs new file mode 100644 index 00000000..a2ed62df --- /dev/null +++ b/fuzz/fuzz_targets/fuzz_target_1.rs @@ -0,0 +1,20 @@ +#![no_main] + +use libfuzzer_sys::fuzz_target; + +fuzz_target!(|data: (i32, i32, &[u8])| { + use py_spy::line_numbers::LineTableBuf; + use py_spy::python_interpreters::CodeObject; + + let co_firstlineno = data.0; + let lasti = data.1; + let rem = data.2; + let mut ct = LineTableBuf::new(rem); + // println!("running {:?} {:?} {:?}", co_firstlineno, lasti, rem); + let code = py_spy::python_bindings::v3_13_0::PyCodeObject { + co_firstlineno: co_firstlineno, + ..Default::default() + }; + let res: Result = code.get_line_number(lasti, &mut ct); + let _ = res; +}); diff --git a/src/binary_parser.rs b/src/binary_parser.rs index cd1317f1..44b0c846 100644 --- a/src/binary_parser.rs +++ b/src/binary_parser.rs @@ -28,6 +28,7 @@ impl BinaryInfo { } /// Uses goblin to parse a binary file, returns information on symbols/bss/adjusted offset etc +#[allow(clippy::unnecessary_map_or)] pub fn parse_binary(filename: &Path, addr: u64, size: u64) -> Result { let offset = addr; diff --git a/src/lib.rs b/src/lib.rs index b7bb259b..40573bef 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -36,11 +36,12 @@ pub mod coredump; #[cfg(feature = "unwind")] mod cython; pub mod dump; +pub mod line_numbers; #[cfg(feature = "unwind")] mod native_stack_trace; -mod python_bindings; +pub mod python_bindings; mod python_data_access; -mod python_interpreters; +pub mod python_interpreters; pub mod python_process_info; pub mod python_spy; mod python_threading; diff --git a/src/line_numbers.rs b/src/line_numbers.rs new file mode 100644 index 00000000..8de50a49 --- /dev/null +++ b/src/line_numbers.rs @@ -0,0 +1,63 @@ +use std::fmt::Debug; + +#[derive(Debug, PartialEq)] +pub struct Error; + +pub struct LineTableBuf<'a> { + offset: usize, + table: &'a [u8], +} + +impl<'a> LineTableBuf<'a> { + pub fn new(it: &'a [u8]) -> Self { + Self { + table: it, + offset: 0, + } + } +} + +impl LineTableBuf<'_> { + pub fn empty(&self) -> bool { + self.offset >= self.table.len() + } + + pub fn u8(&mut self) -> Result { + match self.table.get(self.offset) { + None => Err(Error), + Some(v) => { + self.offset += 1; + Ok(*v) + } + } + } + + pub fn varint(&mut self) -> Result { + let mut ret: usize; + + let mut byte = self.u8()?; + let mut shift = 0; + ret = (byte & 63) as usize; + let mut j = 0; + while byte & 64 != 0 { + if j >= 10 { + return Err(Error); + } + byte = self.u8()?; + shift += 6; + let add = ((byte & 63) as usize).checked_shl(shift).ok_or(Error)?; + ret = ret.checked_add(add).ok_or(Error)?; + j += 1; + } + Ok(ret) + } + + pub fn signed_varint(&mut self) -> Result { + let unsigned_val = self.varint()?; + if unsigned_val & 1 != 0 { + Ok(-((unsigned_val >> 1) as isize)) + } else { + Ok((unsigned_val >> 1) as isize) + } + } +} diff --git a/src/main.rs b/src/main.rs index df0d602c..be0d1b4b 100644 --- a/src/main.rs +++ b/src/main.rs @@ -13,6 +13,7 @@ mod coredump; mod cython; mod dump; mod flamegraph; +mod line_numbers; #[cfg(feature = "unwind")] mod native_stack_trace; mod python_bindings; diff --git a/src/python_bindings/v3_10_0.rs b/src/python_bindings/v3_10_0.rs index 37611203..afedd551 100644 --- a/src/python_bindings/v3_10_0.rs +++ b/src/python_bindings/v3_10_0.rs @@ -101,18 +101,23 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData, []) } + + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_11_0.rs b/src/python_bindings/v3_11_0.rs index ad57a72e..b3959fb5 100644 --- a/src/python_bindings/v3_11_0.rs +++ b/src/python_bindings/v3_11_0.rs @@ -101,18 +101,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData, []) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_12_0.rs b/src/python_bindings/v3_12_0.rs index cc257341..59a0892e 100644 --- a/src/python_bindings/v3_12_0.rs +++ b/src/python_bindings/v3_12_0.rs @@ -101,18 +101,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData, []) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_13_0.rs b/src/python_bindings/v3_13_0.rs index ec40a54c..261bd260 100644 --- a/src/python_bindings/v3_13_0.rs +++ b/src/python_bindings/v3_13_0.rs @@ -102,18 +102,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData, []) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_7_0.rs b/src/python_bindings/v3_7_0.rs index 7cd13800..915b7278 100644 --- a/src/python_bindings/v3_7_0.rs +++ b/src/python_bindings/v3_7_0.rs @@ -98,18 +98,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_8_0.rs b/src/python_bindings/v3_8_0.rs index bced6874..fc182bab 100644 --- a/src/python_bindings/v3_8_0.rs +++ b/src/python_bindings/v3_8_0.rs @@ -98,18 +98,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_bindings/v3_9_5.rs b/src/python_bindings/v3_9_5.rs index 1f80b2d7..1907caad 100644 --- a/src/python_bindings/v3_9_5.rs +++ b/src/python_bindings/v3_9_5.rs @@ -101,18 +101,22 @@ impl __IncompleteArrayField { pub fn new() -> Self { __IncompleteArrayField(::std::marker::PhantomData, []) } + /// # Safety #[inline] pub unsafe fn as_ptr(&self) -> *const T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_mut_ptr(&mut self) -> *mut T { ::std::mem::transmute(self) } + /// # Safety #[inline] pub unsafe fn as_slice(&self, len: usize) -> &[T] { ::std::slice::from_raw_parts(self.as_ptr(), len) } + /// # Safety #[inline] pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] { ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len) diff --git a/src/python_data_access.rs b/src/python_data_access.rs index abf63ce3..af1ec596 100644 --- a/src/python_data_access.rs +++ b/src/python_data_access.rs @@ -139,7 +139,6 @@ pub fn copy_int(process: &P, addr: usize) -> Result { process: &'a P, entries_addr: usize, @@ -277,7 +276,7 @@ impl<'a, P: ProcessMemory> DictIterator<'a, P> { } } -impl<'a, P: ProcessMemory> Iterator for DictIterator<'a, P> { +impl Iterator for DictIterator<'_, P> { type Item = Result<(usize, usize), Error>; fn next(&mut self) -> Option { diff --git a/src/python_interpreters.rs b/src/python_interpreters.rs index c61d2a09..dab6efd5 100644 --- a/src/python_interpreters.rs +++ b/src/python_interpreters.rs @@ -9,6 +9,7 @@ This means we can't dereference them directly. #![allow(clippy::unnecessary_cast)] +use crate::line_numbers::LineTableBuf; // these bindings are automatically generated by rust bindgen // using the generate_bindings.py script use crate::python_bindings::{ @@ -65,7 +66,11 @@ pub trait CodeObject { fn argcount(&self) -> i32; fn varnames(&self) -> *mut Self::TupleObject; - fn get_line_number(&self, lasti: i32, table: &[u8]) -> i32; + fn get_line_number( + &self, + lasti: i32, + table: &mut LineTableBuf, + ) -> Result; } pub trait BytesObject { @@ -216,61 +221,37 @@ macro_rules! PythonCodeObjectImpl { self.co_varnames as *mut Self::TupleObject } - fn get_line_number(&self, lasti: i32, table: &[u8]) -> i32 { + fn get_line_number( + &self, + lasti: i32, + table: &mut LineTableBuf, + ) -> Result { let lasti = lasti as i32; // unpack the line table. format is specified here: // https://github.com/python/cpython/blob/3.9/Objects/lnotab_notes.txt - let size = table.len(); - let mut i = 0; let mut line_number: i32 = self.first_lineno(); let mut bytecode_address: i32 = 0; - while (i + 1) < size { - bytecode_address += i32::from(table[i]); + while !table.empty() { + bytecode_address += i32::from(table.u8()?); if bytecode_address > lasti { break; } - let mut increment = i32::from(table[i + 1]); + let mut increment = i32::from(table.u8()?); // Handle negative line increments in the line number table - as shown here: // https://github.com/python/cpython/blob/143a97f6/Objects/lnotab_notes.txt#L48-L49 if increment >= 0x80 { increment -= 0x100; } line_number += increment; - i += 2; } - line_number + Ok(line_number) } } }; } -fn read_varint(index: &mut usize, table: &[u8]) -> usize { - let mut ret: usize; - let mut byte = table[*index]; - let mut shift = 0; - *index += 1; - ret = (byte & 63) as usize; - - while byte & 64 != 0 { - byte = table[*index]; - *index += 1; - shift += 6; - ret += ((byte & 63) as usize) << shift; - } - ret -} - -fn read_signed_varint(index: &mut usize, table: &[u8]) -> isize { - let unsigned_val = read_varint(index, table); - if unsigned_val & 1 != 0 { - -((unsigned_val >> 1) as isize) - } else { - (unsigned_val >> 1) as isize - } -} - // Use for 3.11 and 3.12 macro_rules! CompactCodeObjectImpl { ($py: ident, $bytesobject: ident, $stringobject: ident) => { @@ -301,49 +282,61 @@ macro_rules! CompactCodeObjectImpl { self.co_localsplusnames as *mut Self::TupleObject } - fn get_line_number(&self, lasti: i32, table: &[u8]) -> i32 { + fn get_line_number( + &self, + lasti: i32, + table: &mut LineTableBuf, + ) -> Result { // unpack compressed table format from python 3.11 // https://github.com/python/cpython/pull/91666/files - let lasti = lasti - offset_of(self, &self.co_code_adaptive) as i32; + let lasti = lasti + .checked_sub(offset_of(self, &self.co_code_adaptive) as i32) + .ok_or(crate::line_numbers::Error)?; + let mut line_number: i32 = self.first_lineno(); let mut bytecode_address: i32 = 0; - - let mut index: usize = 0; - loop { - if index >= table.len() { - break; + let mut j = 0; + const LOOP_BOUND: i32 = 65536; + while !table.empty() { + if j >= LOOP_BOUND { + return Err(crate::line_numbers::Error); } - let byte = table[index]; - index += 1; + let byte = table.u8()?; let delta = ((byte & 7) as i32) + 1; - bytecode_address += delta * 2; + bytecode_address = bytecode_address + .checked_add(delta * 2) + .ok_or(crate::line_numbers::Error)?; let code = (byte >> 3) & 15; let line_delta = match code { 15 => 0, 14 => { - let delta = read_signed_varint(&mut index, table); - read_varint(&mut index, table); // end line - read_varint(&mut index, table); // start column - read_varint(&mut index, table); // end column + let delta = table.signed_varint()?; + table.varint()?; // end line + table.varint()?; // start column + table.varint()?; // end column delta } - 13 => read_signed_varint(&mut index, table), + 13 => table.signed_varint()?, 10..=12 => { - index += 2; // start column / end column - (code - 10).into() + table.u8()?; // start column / end column + table.u8()?; + (code.checked_sub(10).ok_or(crate::line_numbers::Error)?).into() } _ => { - index += 1; // column + table.u8()?; // column 0 } }; - line_number += line_delta as i32; + line_number = line_number + .checked_add(line_delta as i32) + .ok_or(crate::line_numbers::Error)?; if bytecode_address >= lasti { break; } + j += 1; } - line_number + Ok(line_number) } } }; @@ -701,7 +694,11 @@ impl CodeObject for v3_10_0::PyCodeObject { fn varnames(&self) -> *mut Self::TupleObject { self.co_varnames as *mut Self::TupleObject } - fn get_line_number(&self, lasti: i32, table: &[u8]) -> i32 { + fn get_line_number( + &self, + lasti: i32, + table: &mut LineTableBuf, + ) -> Result { // in Python 3.10 we need to double the lasti instruction value here (and no I don't know why) // https://github.com/python/cpython/blob/7b88f63e1dd4006b1a08b9c9f087dd13449ecc76/Python/ceval.c#L5999 // Whereas in python versions up to 3.9 we didn't. @@ -710,14 +707,11 @@ impl CodeObject for v3_10_0::PyCodeObject { // unpack the line table. format is specified here: // https://github.com/python/cpython/blob/3.10/Objects/lnotab_notes.txt - let size = table.len(); - let mut i = 0; let mut line_number: i32 = self.first_lineno(); let mut bytecode_address: i32 = 0; - while (i + 1) < size { - let delta: u8 = table[i]; - let line_delta: i8 = unsafe { std::mem::transmute(table[i + 1]) }; - i += 2; + while !table.empty() { + let delta: u8 = table.u8()?; + let line_delta: i8 = i8::from_ne_bytes([table.u8()?]); if line_delta == -128 { continue; @@ -730,7 +724,7 @@ impl CodeObject for v3_10_0::PyCodeObject { } } - line_number + Ok(line_number) } } @@ -814,19 +808,133 @@ impl TupleObject for v2_7_15::PyTupleObject { #[cfg(test)] mod tests { use super::*; + struct TestData { + python_version: isize, + table: Vec, + co_firstlineno: i32, + lasti: i32, + expected: Result, + } #[test] - fn test_py3_11_line_numbers() { - use crate::python_bindings::v3_11_0::PyCodeObject; - let code = PyCodeObject { - co_firstlineno: 4, - ..Default::default() - }; - - let table = [ - 128_u8, 0, 221, 4, 8, 132, 74, 136, 118, 209, 4, 22, 212, 4, 22, 208, 4, 22, 208, 4, - 22, 208, 4, 22, + fn test_line_numbers() { + let testdata: Vec = vec![ + TestData { + python_version: 11, + table: vec![ + 128_u8, 0, 221, 4, 8, 132, 74, 136, 118, 209, 4, 22, 212, 4, 22, 208, 4, 22, + 208, 4, 22, 208, 4, 22, + ], + co_firstlineno: 4, + lasti: 214, + expected: Ok(5), + }, + TestData { + python_version: 13, + table: vec![128, 0, 220, 4, 7, 136, 1, 133, 70], + co_firstlineno: 7, + lasti: 214, + expected: Ok(8), + }, + TestData { + python_version: 13, + table: vec![ + 240, 3, 1, 1, 1, 216, 5, 6, 128, 2, 242, 4, 2, 1, 12, 242, 8, 1, 1, 11, 240, 6, + 0, 7, 11, 217, 4, 7, 136, 2, 132, 71, 241, 3, 0, 7, 11, + ], + co_firstlineno: 1, + lasti: 226, + expected: Ok(11), + }, + TestData { + python_version: 13, + table: vec![240], + co_firstlineno: 1, + lasti: 226, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![240, 3, 1], + co_firstlineno: 1, + lasti: 226, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![ + 240, 3, 1, 1, 1, 216, 5, 6, 128, 2, 242, 4, 2, 1, 12, 242, 8, 1, 1, 11, 240, 6, + 0, 7, 11, 217, 4, + ], + co_firstlineno: 1, + lasti: 9999, + expected: Err(crate::line_numbers::Error), + }, + TestData { + // 2063563653 751073914 [100, 108, 108, 108, 108, 108, 248, 255, 154] + python_version: 13, + table: vec![100, 108, 108, 108, 108, 108, 248, 255, 154], + co_firstlineno: 2063563653, + lasti: 751073914, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![112, 64, 112, 112, 112, 112, 112, 255, 112, 255, 64, 64, 10], + co_firstlineno: 440220221, + lasti: 1882931261, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![96, 10], + co_firstlineno: 440212029, + lasti: -2147483647, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![239], + co_firstlineno: 1, + lasti: 226, + expected: Err(crate::line_numbers::Error), + }, + TestData { + python_version: 13, + table: vec![], + co_firstlineno: 1, + lasti: 226, + expected: Ok(1), + }, + TestData { + python_version: 7, + table: vec![0u8, 1, 10, 1, 8, 1, 4, 1], + co_firstlineno: 3, + lasti: 30, + expected: Ok(7), + }, ]; - assert_eq!(code.get_line_number(214, &table), 5); + for x in testdata { + let mut ct = LineTableBuf::new(&x.table); + let res = match x.python_version { + 7 => v3_7_0::PyCodeObject { + co_firstlineno: x.co_firstlineno, + ..Default::default() + } + .get_line_number(x.lasti, &mut ct), + 11 => v3_11_0::PyCodeObject { + co_firstlineno: x.co_firstlineno, + ..Default::default() + } + .get_line_number(x.lasti, &mut ct), + 13.. => v3_13_0::PyCodeObject { + co_firstlineno: x.co_firstlineno, + ..Default::default() + } + .get_line_number(x.lasti, &mut ct), + _ => Err(crate::line_numbers::Error), + }; + assert_eq!(x.expected, res) + } } } diff --git a/src/sampler.rs b/src/sampler.rs index 10f0cdfa..d9912971 100644 --- a/src/sampler.rs +++ b/src/sampler.rs @@ -236,7 +236,7 @@ impl Sampler { } // If all of our spies have stopped, we're done - if spies.len() == 0 || spies.values().all(|x| !x.running) { + if spies.is_empty() || spies.values().all(|x| !x.running) { break; } } diff --git a/src/stack_trace.rs b/src/stack_trace.rs index cbfc51da..f9fb4297 100644 --- a/src/stack_trace.rs +++ b/src/stack_trace.rs @@ -6,6 +6,7 @@ use remoteprocess::{Pid, ProcessMemory}; use serde_derive::Serialize; use crate::config::{Config, LineNo}; +use crate::line_numbers::LineTableBuf; use crate::python_data_access::{copy_bytes, copy_string}; use crate::python_interpreters::{ CodeObject, FrameObject, InterpreterState, ThreadState, TupleObject, @@ -246,7 +247,9 @@ fn get_line_number( ) -> Result { let table = copy_bytes(code.line_table(), process).context("Failed to copy line number table")?; - Ok(code.get_line_number(lasti, &table)) + let mut ct = LineTableBuf::new(&table); + code.get_line_number(lasti, &mut ct) + .or_else(|err| bail!("Failed to get line number {err:?}")) } fn get_locals(