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unzip: fix for .zip archives with >4GB file

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function                                             old     new   delta
unzip_main                                          2644    2665     +21
input_tab                                            926     927      +1
bb_banner                                             46      47      +1
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(add/remove: 0/0 grow/shrink: 3/0 up/down: 23/0)               Total: 23 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-04-14 21:15:25 +02:00
parent 1a45b2ccea
commit afc766fc12
1 changed files with 20 additions and 2 deletions
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22
archival/unzip.c
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@@ -82,11 +82,13 @@ enum {
ZIP_FILEHEADER_MAGIC = 0x504b0304,
ZIP_CDF_MAGIC = 0x504b0102, /* CDF item */
ZIP_CDE_MAGIC = 0x504b0506, /* End of CDF */
ZIP64_CDE_MAGIC = 0x504b0606, /* End of Zip64 CDF */
ZIP_DD_MAGIC = 0x504b0708,
#else
ZIP_FILEHEADER_MAGIC = 0x04034b50,
ZIP_CDF_MAGIC = 0x02014b50,
ZIP_CDE_MAGIC = 0x06054b50,
ZIP64_CDE_MAGIC = 0x06064b50,
ZIP_DD_MAGIC = 0x08074b50,
#endif
};
@@ -260,6 +262,12 @@ static uint32_t find_cdf_offset(void)
continue;
/* we found CDE! */
memcpy(cde.raw, p + 1, CDE_LEN);
dbg("cde.this_disk_no:%d", cde.fmt.this_disk_no );
dbg("cde.disk_with_cdf_no:%d", cde.fmt.disk_with_cdf_no );
dbg("cde.cdf_entries_on_this_disk:%d", cde.fmt.cdf_entries_on_this_disk);
dbg("cde.cdf_entries_total:%d", cde.fmt.cdf_entries_total );
dbg("cde.cdf_size:%d", cde.fmt.cdf_size );
dbg("cde.cdf_offset:%x", cde.fmt.cdf_offset );
FIX_ENDIANNESS_CDE(cde);
/*
* I've seen .ZIP files with seemingly valid CDEs
@@ -302,19 +310,27 @@ static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf)
dbg("got ZIP_CDE_MAGIC");
return 0; /* EOF */
}
if (magic == ZIP64_CDE_MAGIC) { /* seen in .zip with >4GB files */
dbg("got ZIP64_CDE_MAGIC");
return 0; /* EOF */
}
xread(zip_fd, cdf->raw, CDF_HEADER_LEN);
FIX_ENDIANNESS_CDF(*cdf);
dbg(" filename_len:%u extra_len:%u file_comment_length:%u",
dbg(" magic:%08x filename_len:%u extra_len:%u file_comment_length:%u",
magic,
(unsigned)cdf->fmt.filename_len,
(unsigned)cdf->fmt.extra_len,
(unsigned)cdf->fmt.file_comment_length
);
//TODO: require that magic == ZIP_CDF_MAGIC?
cdf_offset += 4 + CDF_HEADER_LEN
+ cdf->fmt.filename_len
+ cdf->fmt.extra_len
+ cdf->fmt.file_comment_length;
dbg("Next cdf_offset 0x%x", cdf_offset);
return cdf_offset;
};
#endif
@@ -436,7 +452,9 @@ static void unzip_extract(zip_header_t *zip, int dst_fd)
}
/* Validate decompression - size */
if (zip->fmt.ucmpsize != xstate.bytes_out) {
if (zip->fmt.ucmpsize != 0xffffffff /* seen on files with >4GB uncompressed data */
&& zip->fmt.ucmpsize != xstate.bytes_out
) {
/* Don't die. Who knows, maybe len calculation
* was botched somewhere. After all, crc matched! */
bb_simple_error_msg("bad length");