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Tests: Add a test file for lzma_index_append() integer overflow bug.
This test fails before commit 18d7facd38
.
test_files.sh now runs xz -l for bad-3-index-uncomp-overflow.xz
because only then the previously-buggy code path gets tested.
Normal decompression doesn't use lzma_index_append() at all.
Instead, lzma_index_hash functions are used and those already
did the overflow check.
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3 changed files with 18 additions and 0 deletions
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@ -209,6 +209,16 @@
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file gets rejected specifically due to Unpadded Size having an invalid
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file gets rejected specifically due to Unpadded Size having an invalid
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value.
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value.
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bad-3-index-uncomp-overflow.xz has Index whose Uncompressed Size
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fields have huge values whose sum exceeds the maximum allowed size
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of 2^63 - 1 bytes. In this file the sum is exactly 2^64.
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lzma_index_append() in liblzma <= 5.2.6 lacks the integer overflow
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check for the uncompressed size and thus doesn't catch the error
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when decoding the Index field in this file. This makes "xz -l"
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not detect the error and will display 0 as the uncompressed size.
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Note that regular decompression isn't affected by this bug because
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it uses lzma_index_hash_append() instead.
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bad-2-compressed_data_padding.xz has non-null byte in the padding of
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bad-2-compressed_data_padding.xz has non-null byte in the padding of
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the Compressed Data field of the first Block.
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the Compressed Data field of the first Block.
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BIN
tests/files/bad-3-index-uncomp-overflow.xz
Normal file
BIN
tests/files/bad-3-index-uncomp-overflow.xz
Normal file
Binary file not shown.
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@ -53,6 +53,14 @@ do
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fi
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fi
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done
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done
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# Testing for the lzma_index_append() bug in <= 5.2.6 needs "xz -l":
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I="$srcdir/files/bad-3-index-uncomp-overflow.xz"
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if test -n "$XZ" && "$XZ" -l "$I" > /dev/null 2>&1; then
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echo "Bad file succeeded with xz -l: $I"
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(exit 1)
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exit 1
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fi
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for I in "$srcdir"/files/good-*.lzma
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for I in "$srcdir"/files/good-*.lzma
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do
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do
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if test -z "$XZ" || "$XZ" -dc "$I" > /dev/null; then
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if test -z "$XZ" || "$XZ" -dc "$I" > /dev/null; then
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