The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/portage-stable/+/7468b1e2eb9b87f4150601666f6592d530430205

commit 7468b1e2eb9b87f4150601666f6592d530430205
Author: Alec Thilenius <athilenius@chromium.org>
Date: Wed Sep 27 19:58:02 2017

zip: upgraded package to upstream

Upgraded app-arch/zip to version 3.0-r3 on amd64 using the cros_portage_upgrade and used that unmodified.

BUG= chromium:763060 
TEST=Manually zipped and unzipped a file.

Change-Id: Ic54ea2dd2b690c8991698eaa900e470b08452682
Reviewed-on: https://chromium-review.googlesource.com/677714
Commit-Ready: Alec Thilenius <athilenius@chromium.org>
Tested-by: Alec Thilenius <athilenius@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>

[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/files/zip-2.32-build.patch
[delete] https://crrev.com/f6b430772a44507b37614dda9936fba19890ceec/app-arch/zip/zip-3.0-r1.ebuild
[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/files/zip-2.31-exec-stack.patch
[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/files/zip-3.0-zipnote-freeze.patch
[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/files/zip-3.0-format-security.patch
[rename] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/metadata/md5-cache/app-arch/zip-3.0-r3
[modify] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/metadata.xml
[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/zip-3.0-r3.ebuild
[add] https://crrev.com/7468b1e2eb9b87f4150601666f6592d530430205/app-arch/zip/files/zip-2.3-unix_configure-pic.patch

Is this fixed?