[ISO9660] Test for buffer overflows with Joliet pathname building

Credit: Anthropic

diff --git a/Makefile.am b/Makefile.am
index 74eb15ff00ccc631401541d59cb165ac7aa22b17..99eb38c7676905b8d923748d51d3a6d1b9738d2f 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -508,6 +508,7 @@ libarchive_test_SOURCES= \
        libarchive/test/test_read_format_gtar_sparse_skip_entry.c \
        libarchive/test/test_read_format_huge_rpm.c \
        libarchive/test/test_read_format_iso_Z.c \
+       libarchive/test/test_read_format_iso_joliet_utf16be_overflow.c \
        libarchive/test/test_read_format_iso_multi_extent.c \
        libarchive/test/test_read_format_iso_xorriso.c \
        libarchive/test/test_read_format_isojoliet_bz2.c \
@@ -892,6 +893,7 @@ libarchive_test_EXTRA_DIST=\
        libarchive/test/test_read_format_iso_joliet_by_nero.iso.Z.uu \
        libarchive/test/test_read_format_iso_joliet_long.iso.Z.uu \
        libarchive/test/test_read_format_iso_joliet_rockridge.iso.Z.uu \
+       libarchive/test/test_read_format_iso_joliet_utf16be_overflow.iso.uu \
        libarchive/test/test_read_format_iso_multi_extent.iso.Z.uu \
        libarchive/test/test_read_format_iso_rockridge.iso.Z.uu \
        libarchive/test/test_read_format_iso_rockridge_ce.iso.Z.uu \

diff --git a/libarchive/test/CMakeLists.txt b/libarchive/test/CMakeLists.txt
index 5c42ec7c8e592fa61d49d458cae2ef5f18050721..c48646d0bd5538c94e5c79931a4cd560dc6ce76f 100644 (file)
--- a/libarchive/test/CMakeLists.txt
+++ b/libarchive/test/CMakeLists.txt
@@ -142,6 +142,7 @@ IF(ENABLE_TEST)
     test_read_format_gtar_sparse_skip_entry.c
     test_read_format_huge_rpm.c
     test_read_format_iso_Z.c
+    test_read_format_iso_joliet_utf16be_overflow.c
     test_read_format_iso_multi_extent.c
     test_read_format_iso_xorriso.c
     test_read_format_isojoliet_bz2.c

diff --git a/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.c b/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.c
new file mode 100644 (file)
index 0000000..6635fbe
--- /dev/null
+++ b/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.c
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (c) 2026 Tim Kientzle
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
+ */
+#include "test.h"
+
+/*
+ * A Joliet ISO with deeply nested directories whose UTF-16BE path
+ * exactly fills the 1024-byte buffer in build_pathname_utf16be().
+ * The next recursive call then writes a 2-byte separator past the
+ * end of the allocation (heap-buffer-overflow).
+ *
+ * Under AddressSanitizer the unfixed code crashes at
+ * archive_read_support_format_iso9660.c:3496; with the fix the
+ * bounds check before the separator write causes
+ * archive_read_next_header() to return ARCHIVE_FATAL.
+ */
+DEFINE_TEST(test_read_format_iso_joliet_utf16be_overflow)
+{
+       const char *refname = "test_read_format_iso_joliet_utf16be_overflow.iso";
+       struct archive *a;
+       struct archive_entry *ae;
+       int r;
+
+       extract_reference_file(refname);
+
+       assert((a = archive_read_new()) != NULL);
+       assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a));
+       assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a));
+       assertEqualIntA(a, ARCHIVE_OK,
+           archive_read_open_filename(a, refname, 10240));
+
+       /* Read through entries until the overflow path is reached.
+        * With the fix this returns ARCHIVE_FATAL ("Pathname is too long")
+        * instead of writing two bytes past the end of the path buffer. */
+       while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK)
+               archive_read_data_skip(a);
+       assertEqualInt(ARCHIVE_FATAL, r);
+
+       assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+}

diff --git a/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.iso.uu b/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.iso.uu
new file mode 100644 (file)
index 0000000..92dd832
--- /dev/null
+++ b/libarchive/test/test_read_format_iso_joliet_utf16be_overflow.iso.uu
@@ -0,0 +1,1278 @@
+begin 644 test_read_format_iso_joliet_utf16be_overflow.iso
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+`
+end