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pytypes.cpp
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740 lines (660 loc) · 22 KB
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#include <algorithm>
#include <assert.h>
#include <cstdlib>
#include <ios>
#include <iterator>
#include <utility>
#include "logging.h"
#include "pytypes.h"
#include "structure.h"
#include "version.h"
namespace pystack {
namespace {
template<typename Range, typename Value = typename Range::value_type>
std::string
join(Range const& elements, const char* const delimiter)
{
std::ostringstream os;
auto b = begin(elements), e = end(elements);
if (b == e) {
return "";
}
std::copy(b, prev(e), std::ostream_iterator<Value>(os, delimiter));
os << *prev(e);
return os.str();
}
} // namespace
static const std::string ELLIPSIS = "...";
template<typename T>
std::string
limitOutput(T&& arg, ssize_t max_size)
{
if (max_size - arg.size() > 0) {
return std::forward<T>(arg);
}
return ELLIPSIS;
}
std::string
formatSequence(
const std::vector<remote_addr_t>& items,
const std::shared_ptr<const AbstractProcessManager>& manager,
ssize_t max_size)
{
std::vector<std::string> elements;
elements.reserve(items.size());
ssize_t remaining_size = max_size;
for (auto& item : items) {
LOG(DEBUG) << "Constructing sequence object " << elements.size()
<< " from addr: " << std::showbase << std::hex << item;
std::string item_str = Object(manager, item).toString(remaining_size);
remaining_size -= item_str.size() + 2;
if (remaining_size < (ssize_t)(ELLIPSIS.size() + 2)) {
elements.push_back(ELLIPSIS);
break;
}
elements.push_back(item_str);
}
return join(elements, ", ");
}
static inline bool
containsOnlyASCII(const std::string& val)
{
return std::all_of(val.cbegin(), val.cend(), [](auto& c) {
return static_cast<unsigned char>(c) < 127;
});
}
static inline std::string
normalizeBytesObjectRepresentation(const std::string& val, const std::string& prefix = "b")
{
if (containsOnlyASCII(val)) {
return prefix + '"' + val + '"';
}
return "<BINARY>";
}
TupleObject::TupleObject(
const std::shared_ptr<const AbstractProcessManager>& manager,
remote_addr_t addr)
{
d_manager = manager;
Structure<py_tuple_v> tuple(manager, addr);
ssize_t num_items = tuple.getField(&py_tuple_v::o_ob_size);
if (num_items == 0) {
LOG(DEBUG) << std::hex << std::showbase << "There are no elements in this tuple";
return;
}
d_items.resize(num_items);
manager->copyMemoryFromProcess(
tuple.getFieldRemoteAddress(&py_tuple_v::o_ob_item),
num_items * sizeof(PyObject*),
d_items.data());
}
std::string
TupleObject::toString(ssize_t max_size) const
{
const ssize_t remaining_size = max_size - 2; // Make room for the '(' and the ')'
return "(" + formatSequence(Items(), d_manager, remaining_size) + ")";
}
const std::vector<remote_addr_t>&
TupleObject::Items() const
{
return d_items;
}
ListObject::ListObject(const std::shared_ptr<const AbstractProcessManager>& manager, remote_addr_t addr)
{
d_manager = manager;
Structure<py_list_v> list(manager, addr);
ssize_t num_items = list.getField(&py_list_v::o_ob_size);
if (num_items == 0) {
LOG(DEBUG) << std::hex << std::showbase << "There are no elements in this list";
return;
}
d_items.resize(num_items);
manager->copyMemoryFromProcess(
(remote_addr_t)list.getField(&py_list_v::o_ob_item),
num_items * sizeof(PyObject*),
d_items.data());
}
std::string
ListObject::toString(ssize_t max_size) const
{
const ssize_t remaining_size = max_size - 2; // Make room for the '[' and the ']'
return "[" + formatSequence(Items(), d_manager, remaining_size) + "]";
}
const std::vector<remote_addr_t>&
ListObject::Items() const
{
return d_items;
}
LongObject::LongObject(
const std::shared_ptr<const AbstractProcessManager>& manager,
remote_addr_t addr,
bool is_bool)
: d_is_bool(is_bool)
{
#ifdef ENVIRONMENT64
constexpr unsigned int shift = 30;
#else
constexpr unsigned int shift = 15;
#endif
Structure<py_long_v> longobj(manager, addr);
ssize_t size;
bool negative;
Py_ssize_t ob_size = longobj.getField(&py_long_v::o_ob_size);
if (manager->versionIsAtLeast(3, 12)) {
auto lv_tag = *reinterpret_cast<uintptr_t*>(&ob_size);
negative = (lv_tag & 3) == 2;
size = lv_tag >> 3;
} else {
negative = ob_size < 0;
size = std::abs(ob_size);
}
if (size == 0) {
d_value = 0;
return;
}
/* Python's Include/longobjrep.h has this declaration:
* struct _longobject {
* PyObject_VAR_HEAD
* digit ob_digit[1];
* };
*
* with this description:
* The absolute value of a number is equal to
* SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)
* Negative numbers are represented with ob_size < 0;
* zero is represented by ob_size == 0.
*
* where SHIFT can be either:
* #define PyLong_SHIFT 30
* #define PyLong_SHIFT 15
*/
std::vector<digit> digits;
digits.resize(size);
manager->copyMemoryFromProcess(
longobj.getFieldRemoteAddress(&py_long_v::o_ob_digit),
sizeof(digit) * size,
digits.data());
for (ssize_t i = 0; i < size; ++i) {
long long factor;
if (__builtin_mul_overflow(digits[i], (1Lu << (ssize_t)(shift * i)), &factor)) {
d_overflowed = true;
return;
}
if (__builtin_add_overflow(d_value, factor, &d_value)) {
d_overflowed = true;
return;
}
}
if (negative) {
d_value = -1 * d_value;
}
}
std::string
LongObject::toString(ssize_t max_size) const
{
if (d_is_bool) {
if (Value() > 0) {
return "True";
}
return "False";
}
if (Overflowed()) {
return "<UNRESOLVED BIG INT>";
}
return limitOutput(std::to_string(Value()), max_size);
}
long long int
LongObject::Value() const
{
return d_value;
}
bool
LongObject::Overflowed() const
{
return d_overflowed;
}
void
getDictEntries(
const std::shared_ptr<const AbstractProcessManager>& manager,
Structure<py_dict_v>& dict,
ssize_t& num_items,
std::vector<Python3::PyDictKeyEntry>& valid_entries)
{
assert(manager->versionIsAtLeast(3, 0));
remote_addr_t keys_addr = dict.getField(&py_dict_v::o_ma_keys);
ssize_t dk_size = 0;
int dk_kind = 0;
Structure<py_dictkeys_v> keys(manager, keys_addr);
num_items = keys.getField(&py_dictkeys_v::o_dk_nentries);
dk_size = keys.getField(&py_dictkeys_v::o_dk_size);
if (manager->versionIsAtLeast(3, 11)) {
// We're reusing the o_dk_size offset for dk_log2_size. Fix up the value.
dk_size = 1L << dk_size;
// Added in 3.11
dk_kind = keys.getField(&py_dictkeys_v::o_dk_kind);
}
if (num_items == 0) {
LOG(DEBUG) << std::hex << std::showbase << "There are no elements in this dict";
return;
}
/*
* The size in bytes of an indice depends on dk_size:
*
* - 1 byte if dk_size <= 0xff (char*)
* - 2 bytes if dk_size <= 0xffff (int16_t*)
* - 4 bytes if dk_size <= 0xffffffff (int32_t*)
* - 8 bytes otherwise (int64_t*)
*/
ssize_t offset;
if (dk_size <= 0xFF) {
offset = dk_size;
} else if (dk_size <= 0xFFFF) {
offset = 2 * dk_size;
} else if (dk_size <= 0xFFFFFFFF) {
offset = 4 * dk_size;
} else {
offset = 8 * dk_size;
}
offset_t dk_indices_addr = keys.getFieldRemoteAddress(&py_dictkeys_v::o_dk_indices);
remote_addr_t entries_addr = dk_indices_addr + offset;
std::vector<Python3::PyDictKeyEntry> raw_entries;
raw_entries.resize(num_items);
if (dk_kind != 0) { // New PyDictUnicodeEntry
std::vector<Python3_11::PyDictUnicodeEntry> unicode_entries;
unicode_entries.resize(num_items);
manager->copyMemoryFromProcess(
entries_addr,
num_items * sizeof(Python3_11::PyDictUnicodeEntry),
unicode_entries.data());
std::transform(
unicode_entries.cbegin(),
unicode_entries.cend(),
std::back_inserter(raw_entries),
[](auto& entry) {
return Python3::PyDictKeyEntry{0, entry.me_key, entry.me_value};
});
} else {
manager->copyMemoryFromProcess(
entries_addr,
num_items * sizeof(Python3::PyDictKeyEntry),
raw_entries.data());
}
// Filter out the entries that are empty
std::copy_if(
make_move_iterator(raw_entries.cbegin()),
make_move_iterator(raw_entries.cend()),
std::back_inserter(valid_entries),
[](auto& entry) { return entry.me_key != 0; });
}
bool
DictObject::Invalid() const
{
return d_invalid;
}
const std::vector<remote_addr_t>&
DictObject::Keys() const
{
return d_keys;
}
const std::vector<remote_addr_t>&
DictObject::Values() const
{
return d_values;
}
DictObject::DictObject(std::shared_ptr<const AbstractProcessManager> manager, remote_addr_t addr)
: d_manager(std::move(manager))
{
// For now, the layout that we use here only allows us to get Python3.6+ dictionaries
// as dictionaries before that have much more variability and are much harder to get.
if (d_manager->versionIsAtLeast(3, 6)) {
loadFromPython3(addr);
} else if (d_manager->versionIsAtLeast(3, 0)) {
d_invalid = true;
} else {
loadFromPython2(addr);
}
}
void
DictObject::loadFromPython3(remote_addr_t addr)
{
Structure<py_dict_v> dict(d_manager, addr);
ssize_t num_items;
std::vector<Python3::PyDictKeyEntry> valid_entries;
getDictEntries(d_manager, dict, num_items, valid_entries);
// Copy the keys
d_keys.reserve(valid_entries.size());
std::transform(
valid_entries.cbegin(),
valid_entries.cend(),
std::back_inserter(d_keys),
[](auto& entry) { return (remote_addr_t)entry.me_key; });
/* The DictObject can be in one of two forms.
*
* Either:
* A combined table:
* ma_values == NULL, dk_refcnt == 1.
* Values are stored in the me_value field of the PyDictKeysObject.
* Or:
* A split table:
* ma_values != NULL, dk_refcnt >= 1
* Values are stored in the ma_values array.
* Only string (unicode) keys are allowed.
* All dicts sharing same key must have same insertion order.
*/
remote_addr_t dictvalues_addr = dict.getField(&py_dict_v::o_ma_values);
Structure<py_dictvalues_v> dictvalues(d_manager, dictvalues_addr);
// Get the values in one copy if we are dealing with a split-table dictionary
if (dictvalues_addr != 0) {
d_values.resize(num_items);
auto values_addr = dictvalues.getFieldRemoteAddress(&py_dictvalues_v::o_values);
d_manager->copyMemoryFromProcess(values_addr, num_items * sizeof(PyObject*), d_values.data());
} else {
std::transform(
valid_entries.cbegin(),
valid_entries.cend(),
std::back_inserter(d_values),
[](auto& entry) { return (remote_addr_t)entry.me_value; });
}
}
void
DictObject::loadFromPython2(remote_addr_t addr)
{
Python2::PyDictObject dict;
d_manager->copyObjectFromProcess(addr, &dict);
ssize_t num_items = dict.ma_mask + 1;
std::vector<Python2::PyDictEntry> raw_entries;
raw_entries.resize(num_items);
auto entries_addr = (remote_addr_t)dict.ma_table;
d_manager->copyMemoryFromProcess(
entries_addr,
num_items * sizeof(Python2::PyDictEntry),
raw_entries.data());
std::vector<Python2::PyDictEntry> valid_entries;
// Filter out the entries that are empty
std::copy_if(
std::make_move_iterator(raw_entries.cbegin()),
std::make_move_iterator(raw_entries.cend()),
std::back_inserter(valid_entries),
[](auto& entry) { return entry.me_value != 0; });
// Copy the keys
std::vector<remote_addr_t> keys;
keys.reserve(valid_entries.size());
std::transform(
valid_entries.cbegin(),
valid_entries.cend(),
std::back_inserter(d_keys),
[](auto& entry) { return (remote_addr_t)entry.me_key; });
// Copy the values
d_values.reserve(valid_entries.size());
std::transform(
valid_entries.cbegin(),
valid_entries.cend(),
std::back_inserter(d_values),
[](auto& entry) { return (remote_addr_t)entry.me_value; });
}
std::string
DictObject::toString(ssize_t max_size) const
{
if (Invalid()) {
return "<UNRESOLVED DICT OBJECT>";
}
std::vector<std::string> elements;
elements.reserve(Keys().size());
// Make room for the "{" and the "}"
ssize_t remaining_size = max_size - 2;
for (size_t i = 0; i < Keys().size(); ++i) {
const remote_addr_t key_addr = Keys()[i];
LOG(DEBUG) << "Constructing dictionary key " << i << " from addr: " << std::showbase << std::hex
<< key_addr;
std::string item_str = Object(d_manager, key_addr).toString(remaining_size);
item_str += ": ";
const remote_addr_t val_addr = Values()[i];
LOG(DEBUG) << "Constructing dictionary value " << i << " from addr: " << std::showbase
<< std::hex << val_addr;
item_str += Object(d_manager, val_addr).toString(remaining_size);
remaining_size -= item_str.size() + 2;
if (remaining_size < 5) {
elements.push_back(ELLIPSIS);
break;
}
elements.push_back(item_str);
}
return "{" + join(elements, ", ") + "}";
}
GenericObject::GenericObject(remote_addr_t addr, std::string classname)
: d_addr(addr)
, d_classname(std::move(classname))
{
}
std::string
GenericObject::toString(ssize_t max_size) const
{
std::stringstream os;
os << "<" << std::hex << d_classname << " at 0x" << d_addr << ">";
std::string object_str = os.str();
return limitOutput(object_str, max_size);
}
NoneObject::NoneObject(remote_addr_t addr)
: d_addr(addr)
{
}
std::string
NoneObject::toString([[maybe_unused]] ssize_t max_size) const
{
return "None";
}
Object::Object(const std::shared_ptr<const AbstractProcessManager>& manager, remote_addr_t addr)
: d_addr(addr)
, d_type_addr(0)
, d_classname()
, d_flags()
, d_manager(manager)
{
LOG(DEBUG) << std::hex << std::showbase << "Copying PyObject data from address " << addr;
Structure<py_object_v> obj(manager, addr);
try {
obj.copyFromRemote();
} catch (RemoteMemCopyError& ex) {
LOG(WARNING) << std::hex << std::showbase << "Failed to read PyObject data from address "
<< d_addr;
d_classname = "invalid object";
return;
}
d_type_addr = obj.getField(&py_object_v::o_ob_type);
LOG(DEBUG) << std::hex << std::showbase << "Copying typeobject from address " << d_type_addr;
Structure<py_type_v> cls(manager, d_type_addr);
try {
d_flags = cls.getField(&py_type_v::o_tp_flags);
} catch (RemoteMemCopyError& ex) {
LOG(WARNING) << std::hex << std::showbase << "Failed to read typeobject from address "
<< d_type_addr;
d_classname = "invalid object";
return;
}
remote_addr_t name_addr = cls.getField(&py_type_v::o_tp_name);
try {
d_classname = manager->getCStringFromAddress(name_addr);
} catch (RemoteMemCopyError& ex) {
// If the original ELF files are not available, we can try to guess the class
// name from other available information, specially for the types where the
// class name is needed to categorize then.
d_classname = guessClassName(cls);
}
LOG(DEBUG) << "Object class resolved to: " << d_classname;
}
bool
Object::hasFlags(unsigned long flags) const
{
return flags & d_flags;
}
remote_addr_t
Object::typeAddr() const
{
return d_type_addr;
}
// Helpers for making overloaded lambdas in the variant visitor in Object::toString
template<class... Ts>
struct overloaded : Ts...
{
using Ts::operator()...;
};
template<class... Ts>
overloaded(Ts...) -> overloaded<Ts...>;
std::string
Object::toString(ssize_t max_size) const
{
// Check if we have enough room for an ellipsis and container surrounding
// characters and if not, replace the object with an ellipsis.
if (max_size <= 5) {
return ELLIPSIS;
}
try {
std::stringstream os;
std::visit(
overloaded{
[&](const auto& arg) { os << arg.toString(max_size); },
[&](const bool arg) { os << arg; },
[&](const long arg) { os << arg; },
[&](const double arg) { os << arg; },
[&](const std::string& arg) {
std::string truncated = arg;
if (static_cast<size_t>(max_size) < arg.size()) {
truncated = arg.substr(0, max_size - 3) + "...";
}
os << truncated;
},
},
toConcreteObject());
return os.str();
} catch (RemoteMemCopyError& ex) {
LOG(WARNING) << std::hex << std::showbase << "Failed to create a repr for object of type "
<< d_classname << " at address " << d_addr;
std::stringstream os;
os << std::hex << std::showbase << "<" << d_classname << " object at " << d_addr << ">";
return os.str();
}
}
long
Object::toInteger() const
{
_PyIntObject the_int;
d_manager->copyObjectFromProcess(d_addr, &the_int);
return the_int.ob_ival;
}
double
Object::toFloat() const
{
Structure<py_float_v> the_float(d_manager, d_addr);
return the_float.getField(&py_float_v::o_ob_fval);
}
bool
Object::toBool() const
{
if (toInteger() > 0) {
return true;
}
return false;
}
Object::ObjectType
Object::objectType() const
{
// clang-format off
constexpr long subclass_mask =
(Pystack_TPFLAGS_INT_SUBCLASS
| Pystack_TPFLAGS_LONG_SUBCLASS
| Pystack_TPFLAGS_LIST_SUBCLASS
| Pystack_TPFLAGS_TUPLE_SUBCLASS
| Pystack_TPFLAGS_BYTES_SUBCLASS
| Pystack_TPFLAGS_UNICODE_SUBCLASS
| Pystack_TPFLAGS_DICT_SUBCLASS
| Pystack_TPFLAGS_BASE_EXC_SUBCLASS
| Pystack_TPFLAGS_TYPE_SUBCLASS);
// clang-format on
const long subclass_flags = d_flags & subclass_mask;
if (subclass_flags == Pystack_TPFLAGS_BYTES_SUBCLASS) {
return d_manager->versionIsAtLeast(3, 0) ? ObjectType::BYTES : ObjectType::STRING;
} else if (subclass_flags == Pystack_TPFLAGS_UNICODE_SUBCLASS) {
return ObjectType::STRING;
} else if (subclass_flags == Pystack_TPFLAGS_INT_SUBCLASS) {
if (d_classname == "bool") {
return ObjectType::INT_BOOL;
}
return ObjectType::INT;
} else if (subclass_flags == Pystack_TPFLAGS_LONG_SUBCLASS) {
if (d_classname == "bool") {
return ObjectType::LONG_BOOL;
}
return ObjectType::LONG;
} else if (subclass_flags == Pystack_TPFLAGS_TUPLE_SUBCLASS) {
return ObjectType::TUPLE;
} else if (subclass_flags == Pystack_TPFLAGS_LIST_SUBCLASS) {
return ObjectType::LIST;
} else if (subclass_flags == Pystack_TPFLAGS_DICT_SUBCLASS) {
return ObjectType::DICT;
} else if (d_classname == "float") {
return ObjectType::FLOAT;
} else if (d_classname == "NoneType") {
return ObjectType::NONE;
} else if (d_classname == "code") {
return ObjectType::CODE;
}
return ObjectType::OTHER;
}
Object::PythonObject
Object::toConcreteObject() const
{
try {
switch (objectType()) {
case Object::ObjectType::STRING:
if (d_manager->versionIsAtLeast(3, 0)) {
return '"' + d_manager->getStringFromAddress(d_addr) + '"';
}
return normalizeBytesObjectRepresentation(d_manager->getStringFromAddress(d_addr), "");
case Object::ObjectType::BYTES:
return normalizeBytesObjectRepresentation(d_manager->getBytesFromAddress(d_addr));
case Object::ObjectType::NONE:
return NoneObject(d_addr);
case Object::ObjectType::INT:
return toInteger();
case Object::ObjectType::INT_BOOL:
return toBool();
case Object::ObjectType::LONG:
return LongObject(d_manager, d_addr);
case Object::ObjectType::LONG_BOOL:
return LongObject(d_manager, d_addr, true);
case Object::ObjectType::FLOAT:
return toFloat();
case Object::ObjectType::TUPLE:
return TupleObject(d_manager, d_addr);
case Object::ObjectType::LIST:
return ListObject(d_manager, d_addr);
case Object::ObjectType::DICT:
return DictObject(d_manager, d_addr);
case Object::ObjectType::CODE:
case Object::ObjectType::OTHER:
return GenericObject(d_addr, d_classname);
}
} catch (InvalidRemoteObject&) {
LOG(DEBUG) << std::hex << std::showbase << "Failed to identify object at address: " << d_addr;
}
return GenericObject(d_addr, d_classname);
}
std::string
Object::guessClassName(Structure<py_type_v>& type) const
{
remote_addr_t tp_repr = type.getField(&py_type_v::o_tp_repr);
if (tp_repr == d_manager->findSymbol("float_repr")) {
return "float";
}
if (tp_repr == d_manager->findSymbol("none_repr")) {
return "NoneType";
}
if (tp_repr == d_manager->findSymbol("bool_repr")) {
return "bool";
}
if (tp_repr == d_manager->findSymbol("code_repr")) {
return "PyCodeObject";
}
return "???";
}
} // namespace pystack