python
diff --git a/‎Include/pyport.h‎
Lines changed: 4 additions & 0 deletions b/‎Include/pyport.h‎
Lines changed: 4 additions & 0 deletions
diff --git a/‎Misc/NEWS.d/next/Core_and_Builtins/2026-04-21-19-29-29.gh-issue-148850.MSH0J_.rst‎
Lines changed: 1 addition & 0 deletions b/‎Misc/NEWS.d/next/Core_and_Builtins/2026-04-21-19-29-29.gh-issue-148850.MSH0J_.rst‎
Lines changed: 1 addition & 0 deletions
diff --git a/‎Modules/posixmodule.c‎
Lines changed: 2 additions & 0 deletions b/‎Modules/posixmodule.c‎
Lines changed: 2 additions & 0 deletions
@@ -553,6 +553,7 @@ extern "C" {
 #    if !defined(_Py_MEMORY_SANITIZER)
 #      define _Py_MEMORY_SANITIZER
 #      define _Py_NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+#      define _Py_MSAN_UNPOISON(PTR, SIZE)  (__msan_unpoison(PTR, SIZE))
 #    endif
 #  endif
 #  if __has_feature(address_sanitizer)
@@ -591,6 +592,9 @@ extern "C" {
 #ifndef _Py_NO_SANITIZE_MEMORY
 #  define _Py_NO_SANITIZE_MEMORY
 #endif
+#ifndef _Py_MSAN_UNPOISON
+#  define _Py_MSAN_UNPOISON(PTR, SIZE)
+#endif
 
 /* AIX has __bool__ redefined in it's system header file. */
 #if defined(_AIX) && defined(__bool__)
 
@@ -0,0 +1 @@
+Fix the memory sanitizer false positive in :func:`os.getrandom`.
@@ -17195,6 +17195,8 @@ os_getrandom_impl(PyObject *module, Py_ssize_t size, int flags)
         goto error;
     }
 
+    _Py_MSAN_UNPOISON(data, size);
+
     return PyBytesWriter_FinishWithSize(writer, n);
 
 error:
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fix the memory sanitizer false positive in :func:`os.getrandom`.
Original file line number	Diff line number	Diff line change
`@@ -17195,6 +17195,8 @@ os_getrandom_impl(PyObject *module, Py_ssize_t size, int flags)`
`17195`	`17195`	`goto error;`
`17196`	`17196`	`}`
`17197`	`17197`
	`17198`	`+ _Py_MSAN_UNPOISON(data, size);`
	`17199`	`+`
`17198`	`17200`	`return PyBytesWriter_FinishWithSize(writer, n);`
`17199`	`17201`
`17200`	`17202`	`error:`