[Python-Dev] Remove tempfile.mktemp() (original) (raw)

Sebastian Rittau srittau at rittau.biz
Wed Mar 20 04:57:38 EDT 2019

Am 20.03.19 um 09:47 schrieb Anders Munch:

Greg Ewing:

So use NamedTemporaryFile(delete = False) and close it before passing it to the other program. That's effectively the same as calling tempfile.mktemp. While it does waste time opening and closing an unused file, that doesn't help with security. If anything, it might worsen security.

That is not actually true. The important difference is that with NamedTemporaryFile the file exists with appropriate access right (0600). This denies access of that file to other users. With mktemp() no file is created, so another user can "hijack" that name and cause programs to write potentially privileged data into or read manipulated data from that file.

 - Sebastian

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