Imported Upstream version 1.4

[debian/gzip] / tests / memcpy-abuse

diff --git a/tests/memcpy-abuse b/tests/memcpy-abuse
new file mode 100755 (executable)
index 0000000..8f2abd5
--- /dev/null
+++ b/tests/memcpy-abuse
@@ -0,0 +1,40 @@
+#!/bin/sh
+# Before gzip-1.4, this the use of memcpy in inflate_codes could
+# mistakenly operate on overlapping regions.  Exercise that code.
+
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# limit so don't run it by default.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  gzip --version
+fi
+
+: ${srcdir=.}
+. "$srcdir/tests/init.sh"; path_prepend_ .
+
+# The input must be larger than 32KiB and slightly
+# less uniform than e.g., all zeros.
+printf wxy%032767d 0 | tee in | gzip > in.gz || framework_failure
+
+fail=0
+
+# Before the fix, this would call memcpy with overlapping regions.
+gzip -dc in.gz > out || fail=1
+
+compare in out || fail=1
+
+Exit $fail