Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

I'm puzzled. It is not just documented that posix_spawn_file_actions_addopen() 
should make a copy, but the glibc implementation actually makes it: see for 
example 
https://github.com/bminor/glibc/blob/09533208febe923479261a27b7691abef297d604/posix/spawn_faction_addopen.c
 . I don't see a way of corrupting this memory.

Can non-glibc implementation be used here?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33630>
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