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PR Summary

Cherry picked from release branch.

PR Checklist

… can be resolved to CWD locations

The problem is .NET will return empty strings for special folders that don't exist in some accounts (like System account), and the module path code appends path locations without first checking if the root path is non-empty.  This results in partial paths in the PSModulePath list, which are then interpreted by .NET file APIs as rooted in the current working directory.  And this in turn can allow low privilege users to drop modules in locations that higher privilege accounts will load from, thus gaining escalated privilege code execution.

These changes detect this non-rooted condition and prevents partial paths from being included in search lists.

Cherry picked from !17201
@pull-request-quantifier-deprecated

This PR has 33 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!


Quantification details

Label      : Extra Small
Size       : +26 -7
Percentile : 13.2%

Total files changed: 3

Change summary by file extension:
.cs : +23 -7
.resx : +3 -0

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

Why proper sizing of changes matters

Optimal pull request sizes drive a better predictable PR flow as they strike a
balance between between PR complexity and PR review overhead. PRs within the
optimal size (typical small, or medium sized PRs) mean:

  • Fast and predictable releases to production:
    • Optimal size changes are more likely to be reviewed faster with fewer
      iterations.
    • Similarity in low PR complexity drives similar review times.
  • Review quality is likely higher as complexity is lower:
    • Bugs are more likely to be detected.
    • Code inconsistencies are more likely to be detetcted.
  • Knowledge sharing is improved within the participants:
    • Small portions can be assimilated better.
  • Better engineering practices are exercised:
    • Solving big problems by dividing them in well contained, smaller problems.
    • Exercising separation of concerns within the code changes.

What can I do to optimize my changes

  • Use the PullRequestQuantifier to quantify your PR accurately
    • Create a context profile for your repo using the context generator
    • Exclude files that are not necessary to be reviewed or do not increase the review complexity. Example: Autogenerated code, docs, project IDE setting files, binaries, etc. Check out the Excluded section from your prquantifier.yaml context profile.
    • Understand your typical change complexity, drive towards the desired complexity by adjusting the label mapping in your prquantifier.yaml context profile.
    • Only use the labels that matter to you, see context specification to customize your prquantifier.yaml context profile.
  • Change your engineering behaviors
    • For PRs that fall outside of the desired spectrum, review the details and check if:
      • Your PR could be split in smaller, self-contained PRs instead
      • Your PR only solves one particular issue. (For example, don't refactor and code new features in the same PR).

How to interpret the change counts in git diff output

  • One line was added: +1 -0
  • One line was deleted: +0 -1
  • One line was modified: +1 -1 (git diff doesn't know about modified, it will
    interpret that line like one addition plus one deletion)
  • Change percentiles: Change characteristics (addition, deletion, modification)
    of this PR in relation to all other PRs within the repository.


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@iSazonov iSazonov merged commit c3b7e10 into PowerShell:master May 1, 2022
@TravisEz13 TravisEz13 assigned TravisEz13 and iSazonov and unassigned iSazonov and TravisEz13 May 2, 2022
@TravisEz13 TravisEz13 added the CL-Engine Indicates that a PR should be marked as an engine change in the Change Log label May 5, 2022
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ghost commented May 23, 2022

🎉v7.3.0-preview.4 has been released which incorporates this pull request.:tada:

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