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3706 lines (3244 loc) · 122 KB
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/******************************************************************************
* Python Remote Debugging Module
*
* This module provides functionality to debug Python processes remotely by
* reading their memory and reconstructing stack traces and asyncio task states.
******************************************************************************/
#define _GNU_SOURCE
/* ============================================================================
* HEADERS AND INCLUDES
* ============================================================================ */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include <internal/pycore_debug_offsets.h> // _Py_DebugOffsets
#include <internal/pycore_frame.h> // FRAME_SUSPENDED_YIELD_FROM
#include <internal/pycore_interpframe.h> // FRAME_OWNED_BY_CSTACK
#include <internal/pycore_llist.h> // struct llist_node
#include <internal/pycore_stackref.h> // Py_TAG_BITS
#include <internal/pycore_tstate.h> // _PyThreadStateImpl
#include "../Python/remote_debug.h"
// gh-141784: Python.h header must be included first, before system headers.
// Otherwise, some types such as ino_t can be defined differently, causing ABI
// issues.
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef HAVE_PROCESS_VM_READV
# define HAVE_PROCESS_VM_READV 0
#endif
/* ============================================================================
* TYPE DEFINITIONS AND STRUCTURES
* ============================================================================ */
#define GET_MEMBER(type, obj, offset) \
(*(type *)memcpy(&(type){0}, (const char *)(obj) + (offset), sizeof(type)))
#define CLEAR_PTR_TAG(ptr) (((uintptr_t)(ptr) & ~Py_TAG_BITS))
#define GET_MEMBER_NO_TAG(type, obj, offset) \
(type)(CLEAR_PTR_TAG(GET_MEMBER(type, obj, offset)))
/* Size macros for opaque buffers */
#define SIZEOF_BYTES_OBJ sizeof(PyBytesObject)
#define SIZEOF_CODE_OBJ sizeof(PyCodeObject)
#define SIZEOF_GEN_OBJ sizeof(PyGenObject)
#define SIZEOF_INTERP_FRAME sizeof(_PyInterpreterFrame)
#define SIZEOF_LLIST_NODE sizeof(struct llist_node)
#define SIZEOF_PAGE_CACHE_ENTRY sizeof(page_cache_entry_t)
#define SIZEOF_PYOBJECT sizeof(PyObject)
#define SIZEOF_SET_OBJ sizeof(PySetObject)
#define SIZEOF_TASK_OBJ 4096
#define SIZEOF_THREAD_STATE sizeof(PyThreadState)
#define SIZEOF_TYPE_OBJ sizeof(PyTypeObject)
#define SIZEOF_UNICODE_OBJ sizeof(PyUnicodeObject)
#define SIZEOF_LONG_OBJ sizeof(PyLongObject)
// Calculate the minimum buffer size needed to read interpreter state fields
// We need to read code_object_generation and potentially tlbc_generation
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifdef Py_GIL_DISABLED
#define INTERP_STATE_MIN_SIZE MAX(MAX(MAX(offsetof(PyInterpreterState, _code_object_generation) + sizeof(uint64_t), \
offsetof(PyInterpreterState, tlbc_indices.tlbc_generation) + sizeof(uint32_t)), \
offsetof(PyInterpreterState, threads.head) + sizeof(void*)), \
offsetof(PyInterpreterState, _gil.last_holder) + sizeof(PyThreadState*))
#else
#define INTERP_STATE_MIN_SIZE MAX(MAX(offsetof(PyInterpreterState, _code_object_generation) + sizeof(uint64_t), \
offsetof(PyInterpreterState, threads.head) + sizeof(void*)), \
offsetof(PyInterpreterState, _gil.last_holder) + sizeof(PyThreadState*))
#endif
#define INTERP_STATE_BUFFER_SIZE MAX(INTERP_STATE_MIN_SIZE, 256)
#define MAX_STACK_CHUNK_SIZE (16 * 1024 * 1024) /* 16 MB max for stack chunks */
#define MAX_SET_TABLE_SIZE (1 << 20) /* 1 million entries max for set iteration */
#define MAX_LONG_DIGITS 64 /* Allows values up to ~2^1920 */
// Copied from Modules/_asynciomodule.c because it's not exported
struct _Py_AsyncioModuleDebugOffsets {
struct _asyncio_task_object {
uint64_t size;
uint64_t task_name;
uint64_t task_awaited_by;
uint64_t task_is_task;
uint64_t task_awaited_by_is_set;
uint64_t task_coro;
uint64_t task_node;
} asyncio_task_object;
struct _asyncio_interpreter_state {
uint64_t size;
uint64_t asyncio_tasks_head;
} asyncio_interpreter_state;
struct _asyncio_thread_state {
uint64_t size;
uint64_t asyncio_running_loop;
uint64_t asyncio_running_task;
uint64_t asyncio_tasks_head;
} asyncio_thread_state;
};
/* Treat the remote debug tables as untrusted input and validate every
* size/offset we later dereference against a fixed local buffer or object
* layout before the unwinder starts using them. */
#define FIELD_SIZE(type, member) sizeof(((type *)0)->member)
#define PY_REMOTE_DEBUG_INVALID_ASYNC_DEBUG_OFFSETS (-2)
static inline int
validate_section_size(const char *section_name, uint64_t size)
{
if (size == 0) {
PyErr_Format(
PyExc_RuntimeError,
"Invalid debug offsets: %s.size must be greater than zero",
section_name);
return -1;
}
return 0;
}
static inline int
validate_read_size(const char *section_name, uint64_t size, size_t buffer_size)
{
if (validate_section_size(section_name, size) < 0) {
return -1;
}
if (size > buffer_size) {
PyErr_Format(
PyExc_RuntimeError,
"Invalid debug offsets: %s.size=%llu exceeds local buffer size %zu",
section_name,
(unsigned long long)size,
buffer_size);
return -1;
}
return 0;
}
static inline int
validate_span(
const char *field_name,
uint64_t offset,
size_t width,
uint64_t limit,
const char *limit_name)
{
uint64_t span = (uint64_t)width;
if (span > limit || offset > limit - span) {
PyErr_Format(
PyExc_RuntimeError,
"Invalid debug offsets: %s=%llu with width %zu exceeds %s %llu",
field_name,
(unsigned long long)offset,
width,
limit_name,
(unsigned long long)limit);
return -1;
}
return 0;
}
static inline int
validate_alignment(
const char *field_name,
uint64_t offset,
size_t alignment)
{
if (alignment > 1 && offset % alignment != 0) {
PyErr_Format(
PyExc_RuntimeError,
"Invalid debug offsets: %s=%llu is not aligned to %zu bytes",
field_name,
(unsigned long long)offset,
alignment);
return -1;
}
return 0;
}
static inline int
validate_field(
const char *field_name,
uint64_t offset,
uint64_t reported_size,
size_t width,
size_t alignment,
size_t buffer_size)
{
if (validate_alignment(field_name, offset, alignment) < 0) {
return -1;
}
if (validate_span(field_name, offset, width, reported_size, "reported size") < 0) {
return -1;
}
return validate_span(field_name, offset, width, buffer_size, "local buffer size");
}
static inline int
validate_fixed_field(
const char *field_name,
uint64_t offset,
size_t width,
size_t alignment,
size_t buffer_size)
{
if (validate_alignment(field_name, offset, alignment) < 0) {
return -1;
}
return validate_span(field_name, offset, width, buffer_size, "local buffer size");
}
#define PY_REMOTE_DEBUG_VALIDATE_SECTION(section) \
do { \
if (validate_section_size(#section, debug_offsets->section.size) < 0) { \
return -1; \
} \
} while (0)
#define PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(section, buffer_size) \
do { \
if (validate_read_size(#section, debug_offsets->section.size, buffer_size) < 0) { \
return -1; \
} \
} while (0)
#define PY_REMOTE_DEBUG_VALIDATE_FIELD(section, field, field_size, field_alignment, buffer_size) \
do { \
if (validate_field( \
#section "." #field, \
debug_offsets->section.field, \
debug_offsets->section.size, \
field_size, \
field_alignment, \
buffer_size) < 0) { \
return -1; \
} \
} while (0)
#define PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD(section, field, field_size, field_alignment, buffer_size) \
do { \
if (validate_fixed_field( \
#section "." #field, \
debug_offsets->section.field, \
field_size, \
field_alignment, \
buffer_size) < 0) { \
return -1; \
} \
} while (0)
static inline int
validate_debug_offsets_layout(struct _Py_DebugOffsets *debug_offsets)
{
PY_REMOTE_DEBUG_VALIDATE_SECTION(runtime_state);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
runtime_state,
interpreters_head,
sizeof(uintptr_t),
_Alignof(uintptr_t),
sizeof(_PyRuntimeState));
PY_REMOTE_DEBUG_VALIDATE_SECTION(interpreter_state);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
threads_head,
sizeof(uintptr_t),
_Alignof(uintptr_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
threads_main,
sizeof(uintptr_t),
_Alignof(uintptr_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
gil_runtime_state_locked,
sizeof(int),
_Alignof(int),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
gil_runtime_state_holder,
sizeof(PyThreadState *),
_Alignof(PyThreadState *),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
code_object_generation,
sizeof(uint64_t),
_Alignof(uint64_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_state,
tlbc_generation,
sizeof(uint32_t),
_Alignof(uint32_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(thread_state, SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
thread_state,
next,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
thread_state,
current_frame,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
thread_state,
native_thread_id,
sizeof(unsigned long),
_Alignof(unsigned long),
SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
thread_state,
datastack_chunk,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_SECTION(interpreter_frame);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
previous,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
executable,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
instr_ptr,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
owner,
sizeof(char),
_Alignof(char),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
stackpointer,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
interpreter_frame,
tlbc_index,
sizeof(int32_t),
_Alignof(int32_t),
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_SECTION(code_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
qualname,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
filename,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
linetable,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
firstlineno,
sizeof(int),
_Alignof(int),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
co_code_adaptive,
sizeof(char),
_Alignof(char),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
code_object,
co_tlbc,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_CODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(pyobject);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
pyobject,
ob_type,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_PYOBJECT);
PY_REMOTE_DEBUG_VALIDATE_SECTION(type_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
type_object,
tp_flags,
sizeof(unsigned long),
_Alignof(unsigned long),
SIZEOF_TYPE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(set_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
set_object,
used,
sizeof(Py_ssize_t),
_Alignof(Py_ssize_t),
SIZEOF_SET_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
set_object,
mask,
sizeof(Py_ssize_t),
_Alignof(Py_ssize_t),
SIZEOF_SET_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
set_object,
table,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_SET_OBJ);
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(long_object, SIZEOF_LONG_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
long_object,
lv_tag,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_LONG_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
long_object,
ob_digit,
sizeof(digit),
_Alignof(digit),
SIZEOF_LONG_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(bytes_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
bytes_object,
ob_size,
sizeof(Py_ssize_t),
_Alignof(Py_ssize_t),
SIZEOF_BYTES_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
bytes_object,
ob_sval,
sizeof(char),
_Alignof(char),
SIZEOF_BYTES_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(unicode_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
unicode_object,
length,
sizeof(Py_ssize_t),
_Alignof(Py_ssize_t),
SIZEOF_UNICODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
unicode_object,
asciiobject_size,
sizeof(char),
_Alignof(char),
SIZEOF_UNICODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(gen_object);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
gen_object,
gi_frame_state,
sizeof(int8_t),
_Alignof(int8_t),
SIZEOF_GEN_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
gen_object,
gi_iframe,
FIELD_SIZE(PyGenObject, gi_iframe),
_Alignof(_PyInterpreterFrame),
SIZEOF_GEN_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD(
llist_node,
next,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_LLIST_NODE);
return 0;
}
static inline int
validate_async_debug_offsets_layout(struct _Py_AsyncioModuleDebugOffsets *debug_offsets)
{
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(asyncio_task_object, SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_name,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_awaited_by,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_is_task,
sizeof(char),
_Alignof(char),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_awaited_by_is_set,
sizeof(char),
_Alignof(char),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_coro,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_task_object,
task_node,
SIZEOF_LLIST_NODE,
_Alignof(struct llist_node),
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(asyncio_interpreter_state);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_interpreter_state,
asyncio_tasks_head,
SIZEOF_LLIST_NODE,
_Alignof(struct llist_node),
sizeof(PyInterpreterState));
PY_REMOTE_DEBUG_VALIDATE_SECTION(asyncio_thread_state);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_thread_state,
asyncio_running_loop,
sizeof(uintptr_t),
_Alignof(uintptr_t),
sizeof(_PyThreadStateImpl));
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_thread_state,
asyncio_running_task,
sizeof(uintptr_t),
_Alignof(uintptr_t),
sizeof(_PyThreadStateImpl));
PY_REMOTE_DEBUG_VALIDATE_FIELD(
asyncio_thread_state,
asyncio_tasks_head,
SIZEOF_LLIST_NODE,
_Alignof(struct llist_node),
sizeof(_PyThreadStateImpl));
return 0;
}
#undef PY_REMOTE_DEBUG_VALIDATE_SECTION
#undef PY_REMOTE_DEBUG_VALIDATE_READ_SECTION
#undef PY_REMOTE_DEBUG_VALIDATE_FIELD
#undef PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD
#undef FIELD_SIZE
/* ============================================================================
* STRUCTSEQ TYPE DEFINITIONS
* ============================================================================ */
// TaskInfo structseq type - replaces 4-tuple (task_id, task_name, coroutine_stack, awaited_by)
static PyStructSequence_Field TaskInfo_fields[] = {
{"task_id", "Task ID (memory address)"},
{"task_name", "Task name"},
{"coroutine_stack", "Coroutine call stack"},
{"awaited_by", "Tasks awaiting this task"},
{NULL}
};
static PyStructSequence_Desc TaskInfo_desc = {
"_remote_debugging.TaskInfo",
"Information about an asyncio task",
TaskInfo_fields,
4
};
// FrameInfo structseq type - replaces 3-tuple (filename, lineno, funcname)
static PyStructSequence_Field FrameInfo_fields[] = {
{"filename", "Source code filename"},
{"lineno", "Line number"},
{"funcname", "Function name"},
{NULL}
};
static PyStructSequence_Desc FrameInfo_desc = {
"_remote_debugging.FrameInfo",
"Information about a frame",
FrameInfo_fields,
3
};
// CoroInfo structseq type - replaces 2-tuple (call_stack, task_name)
static PyStructSequence_Field CoroInfo_fields[] = {
{"call_stack", "Coroutine call stack"},
{"task_name", "Task name"},
{NULL}
};
static PyStructSequence_Desc CoroInfo_desc = {
"_remote_debugging.CoroInfo",
"Information about a coroutine",
CoroInfo_fields,
2
};
// ThreadInfo structseq type - replaces 2-tuple (thread_id, frame_info)
static PyStructSequence_Field ThreadInfo_fields[] = {
{"thread_id", "Thread ID"},
{"frame_info", "Frame information"},
{NULL}
};
static PyStructSequence_Desc ThreadInfo_desc = {
"_remote_debugging.ThreadInfo",
"Information about a thread",
ThreadInfo_fields,
2
};
// AwaitedInfo structseq type - replaces 2-tuple (tid, awaited_by_list)
static PyStructSequence_Field AwaitedInfo_fields[] = {
{"thread_id", "Thread ID"},
{"awaited_by", "List of tasks awaited by this thread"},
{NULL}
};
static PyStructSequence_Desc AwaitedInfo_desc = {
"_remote_debugging.AwaitedInfo",
"Information about what a thread is awaiting",
AwaitedInfo_fields,
2
};
typedef struct {
PyObject *func_name;
PyObject *file_name;
int first_lineno;
PyObject *linetable; // bytes
uintptr_t addr_code_adaptive;
} CachedCodeMetadata;
typedef struct {
/* Types */
PyTypeObject *RemoteDebugging_Type;
PyTypeObject *TaskInfo_Type;
PyTypeObject *FrameInfo_Type;
PyTypeObject *CoroInfo_Type;
PyTypeObject *ThreadInfo_Type;
PyTypeObject *AwaitedInfo_Type;
} RemoteDebuggingState;
typedef struct {
PyObject_HEAD
proc_handle_t handle;
uintptr_t runtime_start_address;
struct _Py_DebugOffsets debug_offsets;
int async_debug_offsets_available;
struct _Py_AsyncioModuleDebugOffsets async_debug_offsets;
uintptr_t interpreter_addr;
uintptr_t tstate_addr;
uint64_t code_object_generation;
_Py_hashtable_t *code_object_cache;
int debug;
int only_active_thread;
RemoteDebuggingState *cached_state; // Cached module state
#ifdef Py_GIL_DISABLED
// TLBC cache invalidation tracking
uint32_t tlbc_generation; // Track TLBC index pool changes
_Py_hashtable_t *tlbc_cache; // Cache of TLBC arrays by code object address
#endif
} RemoteUnwinderObject;
#define RemoteUnwinder_CAST(op) ((RemoteUnwinderObject *)(op))
typedef struct
{
int lineno;
int end_lineno;
int column;
int end_column;
} LocationInfo;
typedef struct {
uintptr_t remote_addr;
size_t size;
void *local_copy;
} StackChunkInfo;
typedef struct {
StackChunkInfo *chunks;
size_t count;
} StackChunkList;
#include "clinic/_remote_debugging_module.c.h"
/*[clinic input]
module _remote_debugging
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=5f507d5b2e76a7f7]*/
/* ============================================================================
* FORWARD DECLARATIONS
* ============================================================================ */
static inline int
is_frame_valid(
RemoteUnwinderObject *unwinder,
uintptr_t frame_addr,
uintptr_t code_object_addr
);
typedef int (*thread_processor_func)(
RemoteUnwinderObject *unwinder,
uintptr_t thread_state_addr,
unsigned long tid,
void *context
);
typedef int (*set_entry_processor_func)(
RemoteUnwinderObject *unwinder,
uintptr_t key_addr,
void *context
);
static int
parse_task(
RemoteUnwinderObject *unwinder,
uintptr_t task_address,
PyObject *render_to
);
static int
parse_coro_chain(
RemoteUnwinderObject *unwinder,
uintptr_t coro_address,
PyObject *render_to
);
/* Forward declarations for task parsing functions */
static int parse_frame_object(
RemoteUnwinderObject *unwinder,
PyObject** result,
uintptr_t address,
uintptr_t* address_of_code_object,
uintptr_t* previous_frame
);
static int
parse_async_frame_chain(
RemoteUnwinderObject *unwinder,
PyObject *calls,
uintptr_t address_of_thread,
uintptr_t running_task_code_obj
);
static int read_py_ptr(RemoteUnwinderObject *unwinder, uintptr_t address, uintptr_t *ptr_addr);
static int read_Py_ssize_t(RemoteUnwinderObject *unwinder, uintptr_t address, Py_ssize_t *size);
static int process_task_and_waiters(RemoteUnwinderObject *unwinder, uintptr_t task_addr, PyObject *result);
static int process_task_awaited_by(RemoteUnwinderObject *unwinder, uintptr_t task_address, set_entry_processor_func processor, void *context);
static int find_running_task_in_thread(RemoteUnwinderObject *unwinder, uintptr_t thread_state_addr, uintptr_t *running_task_addr);
static int get_task_code_object(RemoteUnwinderObject *unwinder, uintptr_t task_addr, uintptr_t *code_obj_addr);
static int append_awaited_by(RemoteUnwinderObject *unwinder, unsigned long tid, uintptr_t head_addr, PyObject *result);
/* ============================================================================
* UTILITY FUNCTIONS AND HELPERS
* ============================================================================ */
#define set_exception_cause(unwinder, exc_type, message) \
do { \
assert(PyErr_Occurred() && "function returned -1 without setting exception"); \
if (unwinder->debug && !_Py_RemoteDebug_HasPermissionError()) { \
_set_debug_exception_cause(exc_type, message); \
} \
} while (0)
static void
cached_code_metadata_destroy(void *ptr)
{
CachedCodeMetadata *meta = (CachedCodeMetadata *)ptr;
Py_DECREF(meta->func_name);
Py_DECREF(meta->file_name);
Py_DECREF(meta->linetable);
PyMem_RawFree(meta);
}
static inline RemoteDebuggingState *
RemoteDebugging_GetState(PyObject *module)
{
void *state = _PyModule_GetState(module);
assert(state != NULL);
return (RemoteDebuggingState *)state;
}
static inline RemoteDebuggingState *
RemoteDebugging_GetStateFromType(PyTypeObject *type)
{
PyObject *module = PyType_GetModule(type);
assert(module != NULL);
return RemoteDebugging_GetState(module);
}
static inline RemoteDebuggingState *
RemoteDebugging_GetStateFromObject(PyObject *obj)
{
RemoteUnwinderObject *unwinder = (RemoteUnwinderObject *)obj;
if (unwinder->cached_state == NULL) {
unwinder->cached_state = RemoteDebugging_GetStateFromType(Py_TYPE(obj));
}
return unwinder->cached_state;
}
static inline int
RemoteDebugging_InitState(RemoteDebuggingState *st)
{
return 0;
}
static int
is_prerelease_version(uint64_t version)
{
return (version & 0xF0) != 0xF0;
}
static inline int
validate_debug_offsets(struct _Py_DebugOffsets *debug_offsets)
{
if (memcmp(debug_offsets->cookie, _Py_Debug_Cookie, sizeof(debug_offsets->cookie)) != 0) {
// The remote is probably running a Python version predating debug offsets.
PyErr_SetString(
PyExc_RuntimeError,
"Can't determine the Python version of the remote process");
return -1;
}
// Assume debug offsets could change from one pre-release version to another,
// or one minor version to another, but are stable across patch versions.
if (is_prerelease_version(Py_Version) && Py_Version != debug_offsets->version) {
PyErr_SetString(
PyExc_RuntimeError,
"Can't attach from a pre-release Python interpreter"
" to a process running a different Python version");
return -1;
}
if (is_prerelease_version(debug_offsets->version) && Py_Version != debug_offsets->version) {
PyErr_SetString(
PyExc_RuntimeError,
"Can't attach to a pre-release Python interpreter"
" from a process running a different Python version");
return -1;
}
unsigned int remote_major = (debug_offsets->version >> 24) & 0xFF;
unsigned int remote_minor = (debug_offsets->version >> 16) & 0xFF;
if (PY_MAJOR_VERSION != remote_major || PY_MINOR_VERSION != remote_minor) {
PyErr_Format(
PyExc_RuntimeError,
"Can't attach from a Python %d.%d process to a Python %d.%d process",
PY_MAJOR_VERSION, PY_MINOR_VERSION, remote_major, remote_minor);
return -1;
}
// The debug offsets differ between free threaded and non-free threaded builds.
if (_Py_Debug_Free_Threaded && !debug_offsets->free_threaded) {
PyErr_SetString(
PyExc_RuntimeError,
"Cannot attach from a free-threaded Python process"
" to a process running a non-free-threaded version");
return -1;
}
if (!_Py_Debug_Free_Threaded && debug_offsets->free_threaded) {
PyErr_SetString(
PyExc_RuntimeError,
"Cannot attach to a free-threaded Python process"
" from a process running a non-free-threaded version");
return -1;
}
return validate_debug_offsets_layout(debug_offsets);
}
// Generic function to iterate through all threads
static int
iterate_threads(
RemoteUnwinderObject *unwinder,
thread_processor_func processor,
void *context
) {
uintptr_t thread_state_addr;
unsigned long tid = 0;
if (0 > _Py_RemoteDebug_PagedReadRemoteMemory(
&unwinder->handle,
unwinder->interpreter_addr + (uintptr_t)unwinder->debug_offsets.interpreter_state.threads_main,
sizeof(void*),
&thread_state_addr))
{
set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read main thread state");
return -1;
}
while (thread_state_addr != 0) {
if (0 > _Py_RemoteDebug_PagedReadRemoteMemory(
&unwinder->handle,
thread_state_addr + (uintptr_t)unwinder->debug_offsets.thread_state.native_thread_id,
sizeof(tid),
&tid))
{
set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read thread ID");
return -1;
}
// Call the processor function for this thread
if (processor(unwinder, thread_state_addr, tid, context) < 0) {
return -1;
}
// Move to next thread
if (0 > _Py_RemoteDebug_PagedReadRemoteMemory(
&unwinder->handle,
thread_state_addr + (uintptr_t)unwinder->debug_offsets.thread_state.next,
sizeof(void*),
&thread_state_addr))
{
set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read next thread state");
return -1;
}
}
return 0;
}
// Generic function to iterate through set entries
static int
iterate_set_entries(
RemoteUnwinderObject *unwinder,
uintptr_t set_addr,
set_entry_processor_func processor,
void *context
) {
char set_object[SIZEOF_SET_OBJ];
if (_Py_RemoteDebug_PagedReadRemoteMemory(&unwinder->handle, set_addr,
SIZEOF_SET_OBJ, set_object) < 0) {
set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read set object");
return -1;
}
Py_ssize_t num_els = GET_MEMBER(Py_ssize_t, set_object, unwinder->debug_offsets.set_object.used);
Py_ssize_t mask = GET_MEMBER(Py_ssize_t, set_object, unwinder->debug_offsets.set_object.mask);
uintptr_t table_ptr = GET_MEMBER(uintptr_t, set_object, unwinder->debug_offsets.set_object.table);
if (mask < 0 || mask >= MAX_SET_TABLE_SIZE || num_els < 0 || num_els > mask + 1) {
PyErr_SetString(PyExc_RuntimeError, "Invalid set object (corrupted remote memory)");
set_exception_cause(unwinder, PyExc_RuntimeError,
"Invalid set object (corrupted remote memory)");
return -1;
}
Py_ssize_t set_len = mask + 1;