[Bug 1475250] Re: [isoinfo] could not extract large files

[Taihsiang Ho]

in this case,
len is negative so the program does not begin to extract data in the while loop.


cdrkit-1.1.11/genisoimage/diag/isoinfo.c


 631 extract_file(struct iso_directory_record *idr)
 632 {
 633     int     extent, len, tlen;
 634     unsigned char   buff[2048];
 635 
 636 #if defined(__CYGWIN32__) || defined(__CYGWIN__) || defined(__EMX__) || defined(__DJGPP__)
 637     setmode(fileno(stdout), O_BINARY);
 638 #endif
 639 
 640     extent = isonum_733((unsigned char *)idr->extent);                                                                                                                                                  
 641     len = isonum_733((unsigned char *)idr->size);
 642 
 643     while (len > 0) {
 644 #ifdef  USE_SCG
 645         readsecs(extent - sector_offset, buff, ISO_BLOCKS(sizeof (buff)));
 646         tlen = (len > sizeof (buff) ? sizeof (buff) : len);
 647 #else
 648         lseek(fileno(infile), ((off_t)(extent - sector_offset)) << 11, SEEK_SET);
 649         tlen = (len > sizeof (buff) ? sizeof (buff) : len);
 650         read(fileno(infile), buff, tlen);
 651 #endif
 652         len -= tlen;
 653         extent++;
 654         write(STDOUT_FILENO, buff, tlen); /* FIXME: check return value */
 655     }
 656 }


(gdb) print len
$1 = -1565868032

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https://bugs.launchpad.net/bugs/1475250

Title:
  [isoinfo] could not extract large files

Status in cdrkit package in Ubuntu:
  New

Bug description:
  Ubuntu trusty with genisoimage (9:1.1.11-2ubuntu3)

  
  Steps to reproduce this bug:
  apply this command
  "isoinfo -R -i my-customized-ubuntu-trusty-image.iso -x /casper/filesystem.squashfs"

  Expected result:
  data pops up to stdout

  Actual result:
  nothing pops up to stdout

  
  ------------------------

  More info:

  1. filesystem.squashfs is very large ( 2.6 GB)
  isoinfo -R -i my-customized-ubuntu-trusty-image.iso -l | grep filesystem.sq
  -r--r--r--   1    0    0      2729099264 Jun 22 2015 [ 208211 00]  filesystem.squashfs

  
  2. isovfy my-customized-ubuntu-trusty-image.iso
  Root at extent 25, 2048 bytes
  [0 0]
  [100 124]
  [200 229]
  No errors found

  3. isodump shows the size looks like overflow
  isodump my-customized-ubuntu-trusty-image.iso
  118 [ 1]   11d     2048 02/*CASPER        [RR=1,NM=casper,PX=2,TF]
  press "g" and input "11d + enter"
  146 [ 1] 32d53 -1565868032 00/ FILESYSTEM.SQUASHFS;1[RR=1,NM=filesystem.squashfs,PX=1,TF]

  4. isoinfo version
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                             Version               Architecture          Description
  +++-================================-=====================-=====================-=====================================================================
  ii  genisoimage                      9:1.1.11-2ubuntu3     amd64                 Creates ISO-9660 CD-ROM filesystem images

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