[Bug 1641592] Re: nano 2.5.3-2 on Xenial crashes with long paths on lockfiles

[Antti Tönkyrä]

Package from
https://launchpad.net/ubuntu/+source/nano/2.5.3-2ubuntu2/+build/12012329/+files/nano_2.5.3-2ubuntu2_amd64.deb
worked as expected and fixes the bug described. Thanks!

** Tags removed: verification-needed
** Tags added: verification-done

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Title:
  nano 2.5.3-2 on Xenial crashes with long paths on lockfiles

Status in nano package in Ubuntu:
  Fix Released
Status in nano source package in Xenial:
  Fix Committed

Bug description:
  # lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04
  # apt-cache policy nano
  nano:
    Installed: 2.5.3-2
    Candidate: 2.5.3-2

  Reproducer:
  1. # nano -G 999999999999999999999999999999999999999999999999999999999999999999999999999
  2. <ctrl-z>
  3. # nano -G 999999999999999999999999999999999999999999999999999999999999999999999999999
  4. <answer y/n to the lockfile question>
  5. <nano should segfault>

  Quick dissection:
  Looking at function do_lockfile in files.c, it seems that promptstr is statically allocated to 128 characters. Now with a sufficiently long filename, the following sprintf() call will overflow the allocated promptstr buffer and corrupt memory.

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