From 329abf721214f60077c9b17cc2c4235bdeed2c4f Mon Sep 17 00:00:00 2001
From: "Shawn O. Pearce" <spearce@spearce.org>
Date: Fri, 11 Sep 2009 10:52:13 -0700
Subject: [PATCH] Disallow creating invalid DirCacheEntry records
A dircache record must not use a path string like "/a" or "a//b"
as this results in a tree entry being written with a zero length
name component in the record. C git does not support an empty name,
and neither does any modern filesystem.
A record also must not have a stage outside of the standard 0-3
value range, as there are only 2 bits of space available in the
on-disk format of the record to store the stage information.
Any other values would be truncated into this space, storing a
different value than the caller expected.
If an application tries to create a DirCache record with either of
these wrong values, we abort with an IllegalArgumentException.
Change-Id: I699de149efdfccd85d8adde07d3efd080e3b49c2
Originally: http://thread.gmane.org/gmane.comp.version-control.git/128214
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
CC: Adam W. Hawks <awhawks@writeme.com>
---
.../eclipse/jgit/dircache/DirCacheEntry.java | 55 +++++++-
.../jgit/dircache/DirCacheEntryTest.java | 121 ++++++++++++++++++
2 files changed, 175 insertions(+), 1 deletion(-)
create mode 100644 org.spearce.jgit.test/tst/org/spearce/jgit/dircache/DirCacheEntryTest.java
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
index e170a8852..eed33401d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
@@ -174,6 +174,10 @@ public class DirCacheEntry {
*
* @param newPath
* name of the cache entry.
+ * @throws IllegalArgumentException
+ * If the path starts or ends with "/", or contains "//" either
+ * "\0". These sequences are not permitted in a git tree object
+ * or DirCache file.
*/
public DirCacheEntry(final String newPath) {
this(Constants.encode(newPath));
@@ -186,6 +190,11 @@ public DirCacheEntry(final String newPath) {
* name of the cache entry.
* @param stage
* the stage index of the new entry.
+ * @throws IllegalArgumentException
+ * If the path starts or ends with "/", or contains "//" either
+ * "\0". These sequences are not permitted in a git tree object
+ * or DirCache file. Or if {@code stage} is outside of the
+ * range 0..3, inclusive.
*/
public DirCacheEntry(final String newPath, final int stage) {
this(Constants.encode(newPath), stage);
@@ -196,6 +205,10 @@ public DirCacheEntry(final String newPath, final int stage) {
*
* @param newPath
* name of the cache entry, in the standard encoding.
+ * @throws IllegalArgumentException
+ * If the path starts or ends with "/", or contains "//" either
+ * "\0". These sequences are not permitted in a git tree object
+ * or DirCache file.
*/
public DirCacheEntry(final byte[] newPath) {
this(newPath, STAGE_0);
@@ -208,8 +221,20 @@ public DirCacheEntry(final byte[] newPath) {
* name of the cache entry, in the standard encoding.
* @param stage
* the stage index of the new entry.
+ * @throws IllegalArgumentException
+ * If the path starts or ends with "/", or contains "//" either
+ * "\0". These sequences are not permitted in a git tree object
+ * or DirCache file. Or if {@code stage} is outside of the
+ * range 0..3, inclusive.
*/
public DirCacheEntry(final byte[] newPath, final int stage) {
+ if (!isValidPath(newPath))
+ throw new IllegalArgumentException("Invalid path: "
+ + toString(newPath));
+ if (stage < 0 || 3 < stage)
+ throw new IllegalArgumentException("Invalid stage " + stage
+ + " for path " + toString(newPath));
+
info = new byte[INFO_LEN];
infoOffset = 0;
path = newPath;
@@ -469,7 +494,7 @@ public void setObjectIdFromRaw(final byte[] bs, final int p) {
* returned string.
*/
public String getPathString() {
- return Constants.CHARSET.decode(ByteBuffer.wrap(path)).toString();
+ return toString(path);
}
/**
@@ -500,4 +525,32 @@ private void encodeTS(final int pIdx, final long when) {
NB.encodeInt32(info, base, (int) (when / 1000));
NB.encodeInt32(info, base + 4, ((int) (when % 1000)) * 1000000);
}
+
+ private static String toString(final byte[] path) {
+ return Constants.CHARSET.decode(ByteBuffer.wrap(path)).toString();
+ }
+
+ static boolean isValidPath(final byte[] path) {
+ if (path.length == 0)
+ return false; // empty path is not permitted.
+
+ boolean componentHasChars = false;
+ for (final byte c : path) {
+ switch (c) {
+ case 0:
+ return false; // NUL is never allowed within the path.
+
+ case '/':
+ if (componentHasChars)
+ componentHasChars = false;
+ else
+ return false;
+ break;
+
+ default:
+ componentHasChars = true;
+ }
+ }
+ return componentHasChars;
+ }
}
diff --git a/org.spearce.jgit.test/tst/org/spearce/jgit/dircache/DirCacheEntryTest.java b/org.spearce.jgit.test/tst/org/spearce/jgit/dircache/DirCacheEntryTest.java
new file mode 100644
index 000000000..fa035d332
--- /dev/null
+++ b/org.spearce.jgit.test/tst/org/spearce/jgit/dircache/DirCacheEntryTest.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2009, Google Inc.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ * names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.spearce.jgit.dircache;
+
+import junit.framework.TestCase;
+
+import org.spearce.jgit.lib.Constants;
+
+public class DirCacheEntryTest extends TestCase {
+ public void testIsValidPath() {
+ assertTrue(isValidPath("a"));
+ assertTrue(isValidPath("a/b"));
+ assertTrue(isValidPath("ab/cd/ef"));
+
+ assertFalse(isValidPath(""));
+ assertFalse(isValidPath("/a"));
+ assertFalse(isValidPath("a//b"));
+ assertFalse(isValidPath("ab/cd//ef"));
+ assertFalse(isValidPath("a/"));
+ assertFalse(isValidPath("ab/cd/ef/"));
+ assertFalse(isValidPath("a\u0000b"));
+ }
+
+ private static boolean isValidPath(final String path) {
+ return DirCacheEntry.isValidPath(Constants.encode(path));
+ }
+
+ public void testCreate_ByStringPath() {
+ assertEquals("a", new DirCacheEntry("a").getPathString());
+ assertEquals("a/b", new DirCacheEntry("a/b").getPathString());
+
+ try {
+ new DirCacheEntry("/a");
+ fail("Incorrectly created DirCacheEntry");
+ } catch (IllegalArgumentException err) {
+ assertEquals("Invalid path: /a", err.getMessage());
+ }
+ }
+
+ public void testCreate_ByStringPathAndStage() {
+ DirCacheEntry e;
+
+ e = new DirCacheEntry("a", 0);
+ assertEquals("a", e.getPathString());
+ assertEquals(0, e.getStage());
+
+ e = new DirCacheEntry("a/b", 1);
+ assertEquals("a/b", e.getPathString());
+ assertEquals(1, e.getStage());
+
+ e = new DirCacheEntry("a/c", 2);
+ assertEquals("a/c", e.getPathString());
+ assertEquals(2, e.getStage());
+
+ e = new DirCacheEntry("a/d", 3);
+ assertEquals("a/d", e.getPathString());
+ assertEquals(3, e.getStage());
+
+ try {
+ new DirCacheEntry("/a", 1);
+ fail("Incorrectly created DirCacheEntry");
+ } catch (IllegalArgumentException err) {
+ assertEquals("Invalid path: /a", err.getMessage());
+ }
+
+ try {
+ new DirCacheEntry("a", -11);
+ fail("Incorrectly created DirCacheEntry");
+ } catch (IllegalArgumentException err) {
+ assertEquals("Invalid stage -11 for path a", err.getMessage());
+ }
+
+ try {
+ new DirCacheEntry("a", 4);
+ fail("Incorrectly created DirCacheEntry");
+ } catch (IllegalArgumentException err) {
+ assertEquals("Invalid stage 4 for path a", err.getMessage());
+ }
+ }
+}
--
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