Merge pull request #3245 from kientzle/kientzle-archive-read-failed-header-recovery
[Read core] Allow format handlers to FAIL a header read
(cherry picked from commit f2f3eb9f50)
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9 files changed
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@@ -538,6 +538,7 @@ libarchive_test_SOURCES= \
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libarchive/test/test_read_format_lha_filename.c \
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libarchive/test/test_read_format_lha_filename_utf16.c \
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libarchive/test/test_read_format_lha_oversize_header.c \
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libarchive/test/test_read_format_lha_symlink_missing_target.c \
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libarchive/test/test_read_format_mtree.c \
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libarchive/test/test_read_format_mtree_crash747.c \
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libarchive/test/test_read_format_pax_bz2.c \
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@@ -597,6 +598,7 @@ libarchive_test_SOURCES= \
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libarchive/test/test_read_format_zip_padded.c \
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libarchive/test/test_read_format_zip_sfx.c \
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libarchive/test/test_read_format_zip_size_exceeds_declared.c \
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libarchive/test/test_read_format_zip_symlink_unsupported_compression.c \
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libarchive/test/test_read_format_zip_traditional_encryption_data.c \
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libarchive/test/test_read_format_zip_uncompressed_size_off_by_4gib.c \
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libarchive/test/test_read_format_zip_winzip_aes.c \
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@@ -968,6 +970,7 @@ libarchive_test_EXTRA_DIST=\
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libarchive/test/test_read_format_lha_lh6.lzh.uu \
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libarchive/test/test_read_format_lha_lh7.lzh.uu \
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libarchive/test/test_read_format_lha_oversize_header.lzh.uu \
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libarchive/test/test_read_format_lha_symlink_missing_target.lzh.uu \
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libarchive/test/test_read_format_lha_withjunk.lzh.uu \
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libarchive/test/test_read_format_mtree.mtree.uu \
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libarchive/test/test_read_format_mtree_nomagic.mtree.uu \
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@@ -1136,6 +1139,7 @@ libarchive_test_EXTRA_DIST=\
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libarchive/test/test_read_format_zip_size_exceeds_declared_deflate.zip.uu \
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libarchive/test/test_read_format_zip_size_exceeds_declared_stored.zip.uu \
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libarchive/test/test_read_format_zip_symlink.zip.uu \
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libarchive/test/test_read_format_zip_symlink_unsupported_compression.zip.uu \
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libarchive/test/test_read_format_zip_traditional_encryption_data.zip.uu \
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libarchive/test/test_read_format_zip_uncompressed_size_off_by_4gib.zip.uu \
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libarchive/test/test_read_format_zip_ux.zip.uu \
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@@ -85,6 +85,7 @@ state_name(unsigned s)
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case ARCHIVE_STATE_NEW: return ("new");
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case ARCHIVE_STATE_HEADER: return ("header");
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case ARCHIVE_STATE_DATA: return ("data");
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case ARCHIVE_STATE_DATA_RECOVERY: return ("data_recovery");
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case ARCHIVE_STATE_EOF: return ("eof");
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case ARCHIVE_STATE_CLOSED: return ("closed");
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case ARCHIVE_STATE_FATAL: return ("fatal");
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@@ -61,12 +61,38 @@
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#define ARCHIVE_READ_DISK_MAGIC (0xbadb0c5U)
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#define ARCHIVE_MATCH_MAGIC (0xcad11c9U)
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/*
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* Having the state be a bitmask makes it easy to check
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* for combinations of allowed states. These should
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* generally only be used in public API entry points,
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* primarily in archive_read.c, archive_write.c, etc.
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* Internal callbacks can rely on the core machinery
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* to only call them when appropriate.
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*
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* Generally checked via `__archive_check_magic()`.
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*/
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/* Newly created archive object, not yet opened */
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#define ARCHIVE_STATE_NEW 1U
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/* Archive is ready to read a header. */
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#define ARCHIVE_STATE_HEADER 2U
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/* A header has been read: client can ask for data
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* or they can ask for the next header and
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* we'll automatically skip the remaining data. */
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#define ARCHIVE_STATE_DATA 4U
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/* Similar to STATE_DATA but after a FAILED header:
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* the client may not read data, but they may ask
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* for the next header and we'll recover. */
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#define ARCHIVE_STATE_DATA_RECOVERY 8U
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/* End-of-archive has been reached. Client can only
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* close or free the archive. */
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#define ARCHIVE_STATE_EOF 0x10U
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/* Archive is closed; client is only allowed to free the archive. */
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#define ARCHIVE_STATE_CLOSED 0x20U
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/* Archive is in a FATAL error state: a close request
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* is permitted but ignored. */
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#define ARCHIVE_STATE_FATAL 0x8000U
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/* Any valid (non-fatal) state. */
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#define ARCHIVE_STATE_ANY (0xFFFFU & ~ARCHIVE_STATE_FATAL)
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struct archive_vtable {
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@@ -639,7 +639,8 @@ _archive_read_next_header2(struct archive *_a, struct archive_entry *entry)
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int r1 = ARCHIVE_OK, r2;
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archive_check_magic(_a, ARCHIVE_READ_MAGIC,
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ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
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ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA |
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ARCHIVE_STATE_DATA_RECOVERY,
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"archive_read_next_header");
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archive_entry_clear(entry);
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@@ -648,8 +649,12 @@ _archive_read_next_header2(struct archive *_a, struct archive_entry *entry)
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/*
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* If client didn't consume entire data, skip any remainder
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* (This is especially important for GNU incremental directories.)
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* A header that failed to parse (DATA_RECOVERY) still needs the
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* same treatment: whatever of its body the format reader left
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* unconsumed must be skipped before we can read the next header.
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*/
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if (a->archive.state == ARCHIVE_STATE_DATA) {
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if (a->archive.state == ARCHIVE_STATE_DATA ||
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a->archive.state == ARCHIVE_STATE_DATA_RECOVERY) {
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r1 = archive_read_data_skip(&a->archive);
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if (r1 == ARCHIVE_EOF)
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archive_set_error(&a->archive, EIO,
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@@ -687,6 +692,18 @@ _archive_read_next_header2(struct archive *_a, struct archive_entry *entry)
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case ARCHIVE_FATAL:
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a->archive.state = ARCHIVE_STATE_FATAL;
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break;
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case ARCHIVE_FAILED:
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/*
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* This entry's header could not be parsed, so its metadata
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* cannot be trusted. ARCHIVE_STATE_DATA_RECOVERY still
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* permits skipping past it (the format reader is
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* responsible for ensuring that's actually possible), but
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* blocks archive_read_data() and friends, which all check
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* for ARCHIVE_STATE_DATA specifically and would otherwise
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* return content for an entry we don't actually understand.
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*/
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a->archive.state = ARCHIVE_STATE_DATA_RECOVERY;
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break;
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}
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if (r2 == ARCHIVE_OK || r2 == ARCHIVE_WARN)
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@@ -953,7 +970,8 @@ archive_read_data_skip(struct archive *_a)
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size_t size;
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int64_t offset;
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archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_DATA,
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archive_check_magic(_a, ARCHIVE_READ_MAGIC,
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ARCHIVE_STATE_DATA | ARCHIVE_STATE_DATA_RECOVERY,
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"archive_read_data_skip");
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if (a->format->read_data_skip != NULL)
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@@ -167,6 +167,7 @@ IF(ENABLE_TEST)
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test_read_format_lha_filename.c
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test_read_format_lha_filename_utf16.c
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test_read_format_lha_oversize_header.c
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test_read_format_lha_symlink_missing_target.c
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test_read_format_mtree.c
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test_read_format_mtree_crash747.c
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test_read_format_pax_bz2.c
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@@ -226,6 +227,7 @@ IF(ENABLE_TEST)
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test_read_format_zip_padded.c
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test_read_format_zip_sfx.c
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test_read_format_zip_size_exceeds_declared.c
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test_read_format_zip_symlink_unsupported_compression.c
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test_read_format_zip_traditional_encryption_data.c
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test_read_format_zip_uncompressed_size_off_by_4gib.c
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test_read_format_zip_winzip_aes.c
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@@ -0,0 +1,159 @@
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/*-
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* Copyright (c) 2026 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "test.h"
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#include <fcntl.h>
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/*
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* A malformed symlink entry (one whose pathname lacks the required '|'
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* separator should FAIL the entry but the client should be able to recover
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* and read the following entry.
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*
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* This was an existing behavior of the LHA reader that was incorrectly
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* handled by the read core (it got translated into a FATAL archive condition).
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* Recent fixes to the read core enabled this to work as intended.
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*/
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static struct archive *
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open_fixture(const char *refname)
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{
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struct archive *a;
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extract_reference_file(refname);
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assert((a = archive_read_new()) != NULL);
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assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a));
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assertEqualIntA(a, ARCHIVE_OK,
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archive_read_open_filename(a, refname, 4096));
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return a;
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}
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static void
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test_recovery(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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char buff[32];
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failure("LHA's own ARCHIVE_FAILED from read_header must propagate, "
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"not be silently swallowed or crash");
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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failure("archive_read_next_header() must still be able to advance "
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"past a failed entry to the next one");
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assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
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assertEqualString("second", archive_entry_pathname(ae));
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assertEqualInt(11, (int)archive_read_data(a, buff, sizeof(buff)));
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assertEqualMem(buff, "hello world", 11);
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assertEqualIntA(a, ARCHIVE_EOF, archive_read_next_header(a, &ae));
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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static void
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test_illegal_read_data(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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char buff[32];
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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failure("archive_read_data() must refuse content from a failed "
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"entry, not return real (or garbage) bytes");
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assert(archive_read_data(a, buff, sizeof(buff)) < 0);
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failure("the archive must stay unusable after that misuse, not "
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"silently recover");
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assert(archive_read_next_header(a, &ae) < 0);
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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static void
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test_illegal_read_data_block(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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const void *buff;
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size_t size;
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int64_t offset;
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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failure("archive_read_data_block() must refuse a failed entry");
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assert(archive_read_data_block(a, &buff, &size, &offset) < 0);
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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static void
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test_illegal_seek_data(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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failure("archive_seek_data() must refuse a failed entry");
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assert(archive_seek_data(a, 0, SEEK_SET) < 0);
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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static void
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test_illegal_read_data_into_fd(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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int fd;
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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fd = open("data_into_fd_lha.out", O_WRONLY | O_CREAT | O_TRUNC, 0644);
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assert(fd >= 0);
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failure("archive_read_data_into_fd() must refuse a failed entry");
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assert(archive_read_data_into_fd(a, fd) < 0);
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close(fd);
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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static void
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test_explicit_skip(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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assertEqualIntA(a, ARCHIVE_OK, archive_read_data_skip(a));
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assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
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assertEqualString("second", archive_entry_pathname(ae));
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assertEqualInt(ARCHIVE_OK, archive_read_free(a));
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}
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DEFINE_TEST(test_read_format_lha_symlink_missing_target)
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{
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const char *refname =
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"test_read_format_lha_symlink_missing_target.lzh";
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test_recovery(refname);
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test_illegal_read_data(refname);
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test_illegal_read_data_block(refname);
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test_illegal_seek_data(refname);
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test_illegal_read_data_into_fd(refname);
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test_explicit_skip(refname);
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}
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@@ -0,0 +1,11 @@
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Level-0 LHA archive with two entries: "bad_symlink" is a symlink
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(Unix-extended mode field, S_IFLNK) whose pathname has no '|' separator,
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so lha_parse_linkname() can't extract a link target and read_header()
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returns ARCHIVE_FAILED; "second" is a normal stored file. See
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test_read_format_lha_symlink_missing_target.c.
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begin 644 test_read_format_lha_symlink_missing_target.lzh
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M+>LM;&@P+0``````````````````"V)A9%]S>6UL:6YK``!5``````#_H0``
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J```:]BUL:#`M"P````L````````````&<V5C;VYD:&5L;&\@=V]R;&0`
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`
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end
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@@ -0,0 +1,168 @@
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/*-
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* Copyright (c) 2026 Tim Kientzle
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* All rights reserved.
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*
|
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* 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
|
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
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*/
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#include "test.h"
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#include <fcntl.h>
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/*
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* A symlink entry with an unrecognized compression format should FAIL
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* (that individual entry is unsupported) without preventing the rest of
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* the archive from being read.
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*
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* The Zip reader previously FAILED the entry but the archive read core
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* translated that to FATAL, preventing the client from continuing. Updates
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* to the read core allow us to finally handle that correctly.
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*/
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static struct archive *
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open_fixture(const char *refname)
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{
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struct archive *a;
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extract_reference_file(refname);
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assert((a = archive_read_new()) != NULL);
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assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a));
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assertEqualIntA(a, ARCHIVE_OK,
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archive_read_open_filename(a, refname, 4096));
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return a;
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}
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/* A well-behaved client that never tries to read data from the failed
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* entry must be able to recover and read the rest of the archive. */
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static void
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test_recovery(const char *refname)
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{
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struct archive *a = open_fixture(refname);
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struct archive_entry *ae;
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char buff[32];
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failure("a format's ARCHIVE_FAILED from read_header must propagate, "
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"not be silently swallowed or crash");
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assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
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failure("archive_read_next_header() must still be able to advance "
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"past a failed entry to the next one");
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assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
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assertEqualString("second", archive_entry_pathname(ae));
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assertEqualInt(11, (int)archive_read_data(a, buff, sizeof(buff)));
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assertEqualMem(buff, "hello world", 11);
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_EOF, archive_read_next_header(a, &ae));
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
/* A client that instead tries to read real content from the failed entry
|
||||
* must be refused (not handed garbage, not crash) -- and, matching every
|
||||
* other API-misuse case in libarchive, the archive object is left
|
||||
* unusable afterward rather than silently continuing. */
|
||||
static void
|
||||
test_illegal_read_data(const char *refname)
|
||||
{
|
||||
struct archive *a = open_fixture(refname);
|
||||
struct archive_entry *ae;
|
||||
char buff[32];
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
|
||||
|
||||
failure("archive_read_data() must refuse content from a failed "
|
||||
"entry, not return real (or garbage) bytes");
|
||||
assert(archive_read_data(a, buff, sizeof(buff)) < 0);
|
||||
|
||||
failure("the archive must stay unusable after that misuse, not "
|
||||
"silently recover");
|
||||
assert(archive_read_next_header(a, &ae) < 0);
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
static void
|
||||
test_illegal_read_data_block(const char *refname)
|
||||
{
|
||||
struct archive *a = open_fixture(refname);
|
||||
struct archive_entry *ae;
|
||||
const void *buff;
|
||||
size_t size;
|
||||
int64_t offset;
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
|
||||
failure("archive_read_data_block() must refuse a failed entry");
|
||||
assert(archive_read_data_block(a, &buff, &size, &offset) < 0);
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
static void
|
||||
test_illegal_seek_data(const char *refname)
|
||||
{
|
||||
struct archive *a = open_fixture(refname);
|
||||
struct archive_entry *ae;
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
|
||||
failure("archive_seek_data() must refuse a failed entry");
|
||||
assert(archive_seek_data(a, 0, SEEK_SET) < 0);
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
static void
|
||||
test_illegal_read_data_into_fd(const char *refname)
|
||||
{
|
||||
struct archive *a = open_fixture(refname);
|
||||
struct archive_entry *ae;
|
||||
int fd;
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
|
||||
fd = open("data_into_fd.out", O_WRONLY | O_CREAT | O_TRUNC, 0644);
|
||||
assert(fd >= 0);
|
||||
failure("archive_read_data_into_fd() must refuse a failed entry");
|
||||
assert(archive_read_data_into_fd(a, fd) < 0);
|
||||
close(fd);
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
/* Explicitly calling archive_read_data_skip() (rather than relying on the
|
||||
* implicit skip inside archive_read_next_header()) is a legal way to
|
||||
* recover, too. */
|
||||
static void
|
||||
test_explicit_skip(const char *refname)
|
||||
{
|
||||
struct archive *a = open_fixture(refname);
|
||||
struct archive_entry *ae;
|
||||
|
||||
assertEqualIntA(a, ARCHIVE_FAILED, archive_read_next_header(a, &ae));
|
||||
assertEqualIntA(a, ARCHIVE_OK, archive_read_data_skip(a));
|
||||
assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
|
||||
assertEqualString("second", archive_entry_pathname(ae));
|
||||
assertEqualInt(ARCHIVE_OK, archive_read_free(a));
|
||||
}
|
||||
|
||||
DEFINE_TEST(test_read_format_zip_symlink_unsupported_compression)
|
||||
{
|
||||
const char *refname =
|
||||
"test_read_format_zip_symlink_unsupported_compression.zip";
|
||||
|
||||
test_recovery(refname);
|
||||
test_illegal_read_data(refname);
|
||||
test_illegal_read_data_block(refname);
|
||||
test_illegal_seek_data(refname);
|
||||
test_illegal_read_data_into_fd(refname);
|
||||
test_explicit_skip(refname);
|
||||
}
|
||||
@@ -0,0 +1,16 @@
|
||||
ZIP archive with two entries: "bad_symlink" is a symlink (Unix mode
|
||||
S_IFLNK) whose compression method (200) isn't one of the three the ZIP
|
||||
reader's symlink-target decompression understands (stored/deflate/LZMA
|
||||
alone), triggering ARCHIVE_FAILED from read_header(); "second" is a
|
||||
normal stored file. See
|
||||
test_read_format_zip_symlink_unsupported_compression.c.
|
||||
|
||||
begin 644 test_read_format_zip_symlink_unsupported_compression.zip
|
||||
M4$L#!!0```#(```````^CAE/"0````D````+````8F%D7W-Y;6QI;FMS;VUE
|
||||
M=VAE<G502P,$%````````````(412@T+````"P````8```!S96-O;F1H96QL
|
||||
M;R!W;W)L9%!+`0(4`Q0```#(```````^CAE/"0````D````+````````````
|
||||
M``#_H0````!B861?<WEM;&EN:U!+`0(4`Q0```````````"%$4H-"P````L`
|
||||
M```&``````````````"D@3(```!S96-O;F102P4&``````(``@!M````80``
|
||||
#````
|
||||
`
|
||||
end
|
||||
Reference in new issue
Block a user