[release-branch.go1.20] cmd/go: disallow package directories containing newlines

Directory or file paths containing newlines may cause tools (such as
cmd/cgo) that emit "//line" or "#line" -directives to write part of
the path into non-comment lines in generated source code. If those
lines contain valid Go code, it may be injected into the resulting

(Note that Go import paths and file paths within module zip files
already could not contain newlines.)

Thanks to Juho Nurminen of Mattermost for reporting this issue.

Updates #60167.
Fixes #60516.
Fixes CVE-2023-29402.

Change-Id: Ic3c7d8d1f6460993bd93a27035d61bff7dd68832
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1882606
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
(cherry picked from commit 41f9046495564fc728d6f98384ab7276450ac7e2)
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1902230
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1904347
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/501222
Run-TryBot: David Chase <drchase@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
4 files changed
tree: 8028e9fabc087df10eeebb165a387b07b657c7ca
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  14. README.md
  15. SECURITY.md

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