Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2026-02-21 22:50:55 +00:00
Code Issues Projects Releases Packages Wiki Activity

gh-144563: Fix remote debugging with duplicate libpython mappings from ctypes (#144595)

Browse source 
When _ctypes is imported, it may call dlopen on the libpython shared
library, causing the dynamic linker to load a second mapping of the
library into the process address space. The remote debugging code
iterates memory regions from low addresses upward and returns the first
mapping whose filename matches libpython. After _ctypes is imported, it
finds the dlopen'd copy first, but that copy's PyRuntime section was
never initialized, so reading debug offsets from it fails.

Fix this by validating each candidate PyRuntime address before accepting
it. The validation reads the first 8 bytes and checks for the "xdebugpy"
cookie that is only present in an initialized PyRuntime. Uninitialized
duplicate mappings will fail this check and be skipped, allowing the
search to continue to the real, initialized PyRuntime.
This commit is contained in:
Pablo Galindo Salgado 2026-02-10 10:04:50 +00:00 • committed by GitHub
parent d2d245942e
commit 2c1ca6bb5b
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
4 changed files with 99 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

12
Modules/_remote_debugging/asyncio.c
View file

@ -18,7 +18,8 @@ _Py_RemoteDebug_GetAsyncioDebugAddress(proc_handle_t* handle)
#ifdef MS_WINDOWS
// On Windows, search for asyncio debug in executable or DLL
address = search_windows_map_for_section(handle, "AsyncioD", L"_asyncio");
address = search_windows_map_for_section(handle, "AsyncioD", L"_asyncio",
NULL);
if (address == 0) {
// Error out: 'python' substring covers both executable and DLL
PyObject *exc = PyErr_GetRaisedException();
@ -27,7 +28,8 @@ _Py_RemoteDebug_GetAsyncioDebugAddress(proc_handle_t* handle)
}
#elif defined(__linux__) && HAVE_PROCESS_VM_READV
// On Linux, search for asyncio debug in executable or DLL
address = search_linux_map_for_section(handle, "AsyncioDebug", "python");
address = search_linux_map_for_section(handle, "AsyncioDebug", "python",
NULL);
if (address == 0) {
// Error out: 'python' substring covers both executable and DLL
PyObject *exc = PyErr_GetRaisedException();
@ -36,10 +38,12 @@ _Py_RemoteDebug_GetAsyncioDebugAddress(proc_handle_t* handle)
}
#elif defined(__APPLE__) && TARGET_OS_OSX
// On macOS, try libpython first, then fall back to python
address = search_map_for_section(handle, "AsyncioDebug", "libpython");
address = search_map_for_section(handle, "AsyncioDebug", "libpython",
NULL);
if (address == 0) {
PyErr_Clear();
address = search_map_for_section(handle, "AsyncioDebug", "python");
address = search_map_for_section(handle, "AsyncioDebug", "python",
NULL);
}
if (address == 0) {
// Error out: 'python' substring covers both executable and DLL