minijail0: make jail_change_{user,group} reentrant.

TEST=security_Minijail0
BUG=chromium-os:18473

Change-Id: I5b0aa360fa6196df0bc6cff16dbb8ba8cb23e2a9
Signed-off-by: Elly Jones <ellyjones@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/8144
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
1 file changed