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Bug #14204

[PATCH] socket: use frozen string buffer when releasing GVL

Added by normalperson (Eric Wong) 4 months ago.

Status:
Open
Priority:
Normal
Target version:
-
[ruby-core:84346]

Description

socket: use frozen string buffer when releasing GVL

Using a non-frozen string buffer when GVL is released is
dangerous because another thread may modify that buffer.
This may lead to the contents of an invalid pointer being
written to the socket.

Follow the lead used with core io.c methods and duplicate
the string to a temporary frozen buffer before writing.

* ext/socket/ancdata.c (bsock_sendmsg_internal): use
  rb_str_tmp_frozen_{acquire/release} as with IO#write
* internal.h (rb_str_tmp_frozen_acquire): export
  (rb_str_tmp_frozen_release): export

related to [Bug #14195]

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