windows: add DLL directory search path manipulation functions

A whole class of DLL hijacking attacks can be avoided with a dance like:

    SetDllDirectory("")
    SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32)

For applications who want to opt into this better secure posture, this
commit adds the function definitions to do so.

Reference:
https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setdlldirectorya
https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-setdefaultdlldirectories

Change-Id: I9b6d4e414a80a689b31b9b43a2d5c72de4813c39
Reviewed-on: https://go-review.googlesource.com/c/sys/+/273606
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
4 files changed
tree: e318b5982e1f296b9a5285166960cdbc63898c57
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. codereview.cfg
  10. cpu/
  11. go.mod
  12. internal/
  13. plan9/
  14. unix/
  15. windows/
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

Download/Install

The easiest way to install is to run go get -u golang.org/x/sys. You can also manually git clone the repository to $GOPATH/src/golang.org/x/sys.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the sys repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/sys:” in the subject line, so it is easy to find.