Merge fix for issue #11391

diff --cc Misc/NEWS
index 51a6797a44e4b6222defe4c84073074d28bdc8fd,0b5b74b9377e96973c3c775a92ce8609d3356aed..11708b7b048fc1dd86ac6953ddf56ff33b8517b2
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -55,8 -31,10 +55,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #11391: Writing to a mmap object created with
+   ``mmap.PROT_READ|mmap.PROT_EXEC`` would segfault instead of raising a
+   TypeError.  Patch by Charles-François Natali.
+ 
 +- Issue #9795: add context manager protocol support for nntplib.NNTP class.
 +
  - Issue #11306: mailbox in certain cases adapts to an inability to open
    certain files in read-write mode.  Previously it detected this by
    checking for EACCES, now it also checks for EROFS.