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Copy pathdebug_offsets_validation.h
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511 lines (464 loc) · 19.9 KB
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#ifndef Py_REMOTE_DEBUG_OFFSETS_VALIDATION_H
#define Py_REMOTE_DEBUG_OFFSETS_VALIDATION_H
/*
* The remote debugging tables are read from the target process and must be
* treated as untrusted input. This header centralizes the one-time validation
* that runs immediately after those tables are read, before the unwinder uses
* any reported sizes or offsets to copy remote structs into fixed local
* buffers or to interpret those local copies.
*
* The key rule is simple: every offset that is later dereferenced against a
* local buffer or local object view must appear in one of the field lists
* below. Validation then checks two bounds for each field:
*
* 1. The field must fit within the section size reported by the target.
* 2. The same field must also fit within the local buffer or local layout the
* debugger will actually use.
*
* Sections that are copied into fixed local buffers also have their reported
* size checked against the corresponding local buffer size up front.
*
* This is intentionally front-loaded. Once validation succeeds, the hot path
* can keep using the raw offsets without adding per-sample bounds checks.
*
* Maintenance rule: if either exported table grows, the static_asserts below
* should yell at you. When that happens, update the matching field lists in
* this file in the same change. And if you add a new field that the unwinder
* is going to poke at later, put it in the right list here too, so nobody has
* to rediscover this the annoying way.
*/
#define FIELD_SIZE(type, member) sizeof(((type *)0)->member)
enum {
PY_REMOTE_DEBUG_OFFSETS_TOTAL_SIZE = 888,
PY_REMOTE_ASYNC_DEBUG_OFFSETS_TOTAL_SIZE = 104,
};
/*
* These asserts are the coordination tripwire for table growth. If either
* exported table changes size, update the validation lists below in the same
* change.
*/
static_assert(
sizeof(_Py_DebugOffsets) == PY_REMOTE_DEBUG_OFFSETS_TOTAL_SIZE,
"Update _remote_debugging validation for _Py_DebugOffsets");
static_assert(
sizeof(struct _Py_AsyncioModuleDebugOffsets) ==
PY_REMOTE_ASYNC_DEBUG_OFFSETS_TOTAL_SIZE,
"Update _remote_debugging validation for _Py_AsyncioModuleDebugOffsets");
/* Derive unexported offsets from adjacent fields to keep the debug-offset
* table compatible across patch releases. */
static_assert(offsetof(PyThreadState, exc_info) ==
offsetof(PyThreadState, current_exception) + sizeof(uintptr_t),
"exc_info must immediately follow current_exception");
static_assert(offsetof(_PyErr_StackItem, previous_item) ==
offsetof(_PyErr_StackItem, exc_value) + sizeof(uintptr_t),
"previous_item must immediately follow exc_value");
/*
* This logic lives in a private header because it is shared by module.c and
* asyncio.c. Keep the helpers static inline so they stay local to those users
* without adding another compilation unit or exported symbols.
*/
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 reported_size,
uint64_t offset,
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_nested_field(
const char *field_name,
uint64_t reported_size,
uint64_t base_offset,
uint64_t nested_offset,
size_t width,
size_t alignment,
size_t buffer_size)
{
if (base_offset > UINT64_MAX - nested_offset) {
PyErr_Format(
PyExc_RuntimeError,
"Invalid debug offsets: %s overflows the offset calculation",
field_name);
return -1;
}
return validate_field(
field_name,
reported_size,
base_offset + nested_offset,
width,
alignment,
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.size, \
debug_offsets->section.field, \
field_size, \
field_alignment, \
buffer_size) < 0) { \
return -1; \
} \
} while (0)
#define PY_REMOTE_DEBUG_VALIDATE_NESTED_FIELD(section, base, nested_section, field, field_size, field_alignment, buffer_size) \
do { \
if (validate_nested_field( \
#section "." #base "." #field, \
debug_offsets->section.size, \
debug_offsets->section.base, \
debug_offsets->nested_section.field, \
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)
/*
* Each list below must include every offset that is later dereferenced against
* a local buffer or local object view. The validator checks that each field
* stays within both the remote table's reported section size and the local
* buffer size we use when reading that section. If a new dereferenced field is
* added to the offset tables, add it to the matching list here.
*
* Sections not listed here are present in the offset tables but not used by
* the unwinder, so no validation is needed for them.
*/
#define PY_REMOTE_DEBUG_RUNTIME_STATE_FIELDS(APPLY, buffer_size) \
APPLY(runtime_state, interpreters_head, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size)
/* current_exception also covers the adjacent exc_info pointer. */
#define PY_REMOTE_DEBUG_THREAD_STATE_FIELDS(APPLY, buffer_size) \
APPLY(thread_state, native_thread_id, sizeof(unsigned long), _Alignof(long), buffer_size); \
APPLY(thread_state, interp, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, datastack_chunk, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, status, FIELD_SIZE(PyThreadState, _status), _Alignof(unsigned int), buffer_size); \
APPLY(thread_state, holds_gil, sizeof(int), _Alignof(int), buffer_size); \
APPLY(thread_state, gil_requested, sizeof(int), _Alignof(int), buffer_size); \
APPLY(thread_state, current_exception, 2 * sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, thread_id, sizeof(unsigned long), _Alignof(long), buffer_size); \
APPLY(thread_state, next, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, current_frame, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, base_frame, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, last_profiled_frame, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(thread_state, last_profiled_frame_seq, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size)
#define PY_REMOTE_DEBUG_INTERPRETER_STATE_FIELDS(APPLY, buffer_size) \
APPLY(interpreter_state, id, sizeof(int64_t), _Alignof(int64_t), buffer_size); \
APPLY(interpreter_state, next, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_state, threads_head, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_state, threads_main, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_state, gil_runtime_state_locked, sizeof(int), _Alignof(int), buffer_size); \
APPLY(interpreter_state, gil_runtime_state_holder, sizeof(PyThreadState *), _Alignof(PyThreadState *), buffer_size); \
APPLY(interpreter_state, code_object_generation, sizeof(uint64_t), _Alignof(uint64_t), buffer_size); \
APPLY(interpreter_state, tlbc_generation, sizeof(uint32_t), _Alignof(uint32_t), buffer_size)
#define PY_REMOTE_DEBUG_INTERPRETER_FRAME_FIELDS(APPLY, buffer_size) \
APPLY(interpreter_frame, previous, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_frame, executable, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_frame, instr_ptr, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_frame, owner, sizeof(char), _Alignof(char), buffer_size); \
APPLY(interpreter_frame, stackpointer, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(interpreter_frame, tlbc_index, sizeof(int32_t), _Alignof(int32_t), buffer_size)
#define PY_REMOTE_DEBUG_CODE_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(code_object, qualname, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(code_object, filename, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(code_object, linetable, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(code_object, firstlineno, sizeof(int), _Alignof(int), buffer_size); \
APPLY(code_object, co_code_adaptive, sizeof(char), _Alignof(char), buffer_size); \
APPLY(code_object, co_tlbc, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size)
#define PY_REMOTE_DEBUG_SET_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(set_object, used, sizeof(Py_ssize_t), _Alignof(Py_ssize_t), buffer_size); \
APPLY(set_object, mask, sizeof(Py_ssize_t), _Alignof(Py_ssize_t), buffer_size); \
APPLY(set_object, table, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size)
#define PY_REMOTE_DEBUG_LONG_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(long_object, lv_tag, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(long_object, ob_digit, sizeof(digit), _Alignof(digit), buffer_size)
#define PY_REMOTE_DEBUG_BYTES_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(bytes_object, ob_size, sizeof(Py_ssize_t), _Alignof(Py_ssize_t), buffer_size); \
APPLY(bytes_object, ob_sval, sizeof(char), _Alignof(char), buffer_size)
#define PY_REMOTE_DEBUG_UNICODE_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(unicode_object, length, sizeof(Py_ssize_t), _Alignof(Py_ssize_t), buffer_size); \
APPLY(unicode_object, state, sizeof(struct _PyUnicodeObject_state), _Alignof(struct _PyUnicodeObject_state), buffer_size); \
APPLY(unicode_object, asciiobject_size, sizeof(char), _Alignof(char), buffer_size); \
APPLY(unicode_object, compactunicodeobject_size, sizeof(char), _Alignof(char), buffer_size)
#define PY_REMOTE_DEBUG_GEN_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(gen_object, gi_frame_state, sizeof(int8_t), _Alignof(int8_t), buffer_size); \
APPLY(gen_object, gi_iframe, FIELD_SIZE(PyGenObject, gi_iframe), _Alignof(_PyInterpreterFrame), buffer_size)
#define PY_REMOTE_DEBUG_TASK_OBJECT_FIELDS(APPLY, buffer_size) \
APPLY(asyncio_task_object, task_name, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(asyncio_task_object, task_awaited_by, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(asyncio_task_object, task_is_task, sizeof(char), _Alignof(char), buffer_size); \
APPLY(asyncio_task_object, task_awaited_by_is_set, sizeof(char), _Alignof(char), buffer_size); \
APPLY(asyncio_task_object, task_coro, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(asyncio_task_object, task_node, SIZEOF_LLIST_NODE, _Alignof(struct llist_node), buffer_size)
#define PY_REMOTE_DEBUG_ASYNC_INTERPRETER_STATE_FIELDS(APPLY, buffer_size) \
APPLY(asyncio_interpreter_state, asyncio_tasks_head, SIZEOF_LLIST_NODE, _Alignof(struct llist_node), buffer_size)
#define PY_REMOTE_DEBUG_ASYNC_THREAD_STATE_FIELDS(APPLY, buffer_size) \
APPLY(asyncio_thread_state, asyncio_running_loop, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(asyncio_thread_state, asyncio_running_task, sizeof(uintptr_t), _Alignof(uintptr_t), buffer_size); \
APPLY(asyncio_thread_state, asyncio_tasks_head, SIZEOF_LLIST_NODE, _Alignof(struct llist_node), buffer_size)
/* Called once after reading _Py_DebugOffsets, before any hot-path use. */
static inline int
_PyRemoteDebug_ValidateDebugOffsetsLayout(struct _Py_DebugOffsets *debug_offsets)
{
/* Validate every field the unwinder dereferences against a local buffer
* or local object view. Fields used only for remote address arithmetic
* (e.g. runtime_state.interpreters_head) are also checked as a sanity
* bound on the offset value. */
PY_REMOTE_DEBUG_VALIDATE_SECTION(runtime_state);
PY_REMOTE_DEBUG_RUNTIME_STATE_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
sizeof(_PyRuntimeState));
PY_REMOTE_DEBUG_VALIDATE_SECTION(interpreter_state);
PY_REMOTE_DEBUG_INTERPRETER_STATE_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(thread_state, SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_THREAD_STATE_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_THREAD_STATE);
/* exc_value also covers the adjacent previous_item pointer. */
PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD(
err_stackitem,
exc_value,
2 * sizeof(uintptr_t),
_Alignof(uintptr_t),
sizeof(_PyErr_StackItem));
PY_REMOTE_DEBUG_VALIDATE_NESTED_FIELD(
thread_state,
exc_state,
err_stackitem,
exc_value,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_THREAD_STATE);
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(gc, SIZEOF_GC_RUNTIME_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
gc,
frame,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_GC_RUNTIME_STATE);
PY_REMOTE_DEBUG_VALIDATE_FIELD(
gc,
generation_stats,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_GC_RUNTIME_STATE);
PY_REMOTE_DEBUG_VALIDATE_NESTED_FIELD(
interpreter_state,
gc,
gc,
frame,
sizeof(uintptr_t),
_Alignof(uintptr_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_NESTED_FIELD(
interpreter_state,
gc,
gc,
generation_stats,
sizeof(uintptr_t),
_Alignof(uintptr_t),
INTERP_STATE_BUFFER_SIZE);
PY_REMOTE_DEBUG_VALIDATE_SECTION(interpreter_frame);
PY_REMOTE_DEBUG_INTERPRETER_FRAME_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_INTERP_FRAME);
PY_REMOTE_DEBUG_VALIDATE_SECTION(code_object);
PY_REMOTE_DEBUG_CODE_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
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_SET_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_SET_OBJ);
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(long_object, SIZEOF_LONG_OBJ);
PY_REMOTE_DEBUG_LONG_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_LONG_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(bytes_object);
PY_REMOTE_DEBUG_BYTES_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_BYTES_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(unicode_object);
PY_REMOTE_DEBUG_UNICODE_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_UNICODE_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(gen_object);
PY_REMOTE_DEBUG_GEN_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_GEN_OBJ);
PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD(
llist_node,
next,
sizeof(uintptr_t),
_Alignof(uintptr_t),
SIZEOF_LLIST_NODE);
return 0;
}
/* Called once when AsyncioDebug is loaded, before any task inspection uses it. */
static inline int
_PyRemoteDebug_ValidateAsyncDebugOffsets(
struct _Py_AsyncioModuleDebugOffsets *debug_offsets)
{
PY_REMOTE_DEBUG_VALIDATE_READ_SECTION(asyncio_task_object, SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_TASK_OBJECT_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
SIZEOF_TASK_OBJ);
PY_REMOTE_DEBUG_VALIDATE_SECTION(asyncio_interpreter_state);
PY_REMOTE_DEBUG_ASYNC_INTERPRETER_STATE_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
sizeof(PyInterpreterState));
PY_REMOTE_DEBUG_VALIDATE_SECTION(asyncio_thread_state);
PY_REMOTE_DEBUG_ASYNC_THREAD_STATE_FIELDS(
PY_REMOTE_DEBUG_VALIDATE_FIELD,
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_NESTED_FIELD
#undef PY_REMOTE_DEBUG_VALIDATE_FIXED_FIELD
#undef PY_REMOTE_DEBUG_RUNTIME_STATE_FIELDS
#undef PY_REMOTE_DEBUG_THREAD_STATE_FIELDS
#undef PY_REMOTE_DEBUG_INTERPRETER_STATE_FIELDS
#undef PY_REMOTE_DEBUG_INTERPRETER_FRAME_FIELDS
#undef PY_REMOTE_DEBUG_CODE_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_SET_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_LONG_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_BYTES_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_UNICODE_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_GEN_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_TASK_OBJECT_FIELDS
#undef PY_REMOTE_DEBUG_ASYNC_INTERPRETER_STATE_FIELDS
#undef PY_REMOTE_DEBUG_ASYNC_THREAD_STATE_FIELDS
#undef FIELD_SIZE
#endif