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[Frederik Hartmann <2091440@xxxxxxxxxxxxxxxxxx>]

My tests are supporting this conclusion:

lftp hartmafk@xxxxxxxxxxxxxxxxxx:/HARTMAFK.191> cd /GPLSRV2:HARTMAFK.CODE
cd ok, cwd=/GPLSRV2:HARTMAFK.CODE

It works if I CD with a "fake" absolute path.

And it happily blows up on an empty cd as well:

lftp hartmafk@xxxxxxxxxxxxxxxxxx:/> cd
*** buffer overflow detected ***: terminated
Aborted


The concept of absolute paths doesn't really make a lot of sense in the context of z/OS and z/VM, leading to this issue.

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https://bugs.launchpad.net/bugs/2091440

Title:
  [UBUNTU 24.10] lftp: buffer overflow detected when accessing z/VM FTP
  server and changing the directory

Status in Ubuntu on IBM z Systems:
  Triaged
Status in lftp package in Ubuntu:
  New
Status in lftp source package in Noble:
  New
Status in lftp source package in Oracular:
  Won't Fix
Status in lftp source package in Plucky:
  New

Bug description:
  ---Problem Description---
  lftp: buffer overflow detected when accessing z/VM FTP server and changing the directory
   
  ---uname output---
  Linux lnxzvmd1 6.11.0-9-generic #9-Ubuntu SMP Mon Oct 14 12:18:15 UTC 2024 s390x s390x s390x GNU/Linux
   
  ---Steps to Reproduce---
   1. Connect with lftp to z/VM FTP server: 

  lftp -u hartmafk gdlvm7.pok.ibm.com

  2. Validate correct connection:

  ls
  > BOOKM    FILE     V         65          9          1 2016-08-10 04:45:31 HAR191
  > CPFMTXA  EXCORIG  V         63        711          7 2005-10-10 07:52:28 HAR191
  > CPFMTXA  EXEC     V         63        711          7 2005-10-10 07:52:28 HAR191
  > CPFMTXA  MODORIG  V         96          3          1 2005-10-14 09:30:44 HAR191
  > CPFMTXA  MODULE   V         96          3          1 2005-10-14 09:30:44 HAR191
  > CRUISE   LASTCMDS V         88         53          1 2024-12-04 09:28:24 HAR191
  > DDOPTS   OPTIONS  V         58          1          1 2002-12-03 16:26:24 HAR191

  3. Change directory to SFS directory or minidisk:

  cd HARTMAFK.191
  *** buffer overflow detected ***: terminated
  Aborted

  
   
  Machine Type = IBM/S390 3906 
   
  ---Debugger---
  A debugger is not configured
   
  Contact Information = frederik.hartmann@xxxxxxxxxx 
   
  Userspace tool common name: lftp 
   
  The userspace tool has the following bit modes: 64 

  Userspace rpm: lftp

  Userspace tool obtained from project website:  4.9.2-3ubuntu1 
   
  *Additional Instructions for frederik.hartmann@xxxxxxxxxx: 
  -Post a private note with access information to the machine that the bug is occuring on.
  -Attach ltrace and strace of userspace application.

  ===============================================================================
  This issue can only be reproduced when lftp is compiled without debug option.

  I was able to reproduce this issue with a self compiled lftp 4.9.3 on
  s390x with the default build and with a plain ./configure, I was NOT
  able to reproduce this issue with ./configure --with-debug

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