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extract: use open(create=true) when extracting files #148

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@StefanKarpinski StefanKarpinski commented Oct 25, 2022

Using open's create flag when extracting files should prevent certain kinds of attacks if all our other defenses don't catch them, e.g. writing CON on Windows or /etc/passwd on UNIX. Closes #147.

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@vtjnash, is this what you had in mind?

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codecov bot commented Oct 25, 2022

Codecov Report

Base: 97.37% // Head: 97.37% // No change to project coverage 👍

Coverage data is based on head (0dc24db) compared to base (6bfc114).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files
@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   97.37%   97.37%           
=======================================
  Files           4        4           
  Lines         801      801           
=======================================
  Hits          780      780           
  Misses         21       21           
Impacted Files Coverage Δ
src/extract.jl 98.14% <100.00%> (ø)

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security improvement: open files with O_EXCL for writing
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