[Bug 1769848] Re: wodim no longer works from non-root accounts

[John Zaitseff]

Further to my last comment, I'm wondering whether the actual number of
bytes that can be successfully mmap()ed is determined by how many other
pages are already mmap()ed.  Therefore I've set CDR_FIFOSIZE=6m in my
/etc/wodim.conf.  Hopefully that will work--I'll test it next time I
have a CD-R to burn!

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Title:
  wodim no longer works from non-root accounts

Status in cdrkit package in Ubuntu:
  New

Bug description:
  With the upgrade from Artful to Bionic (18.04 LTS), wodim no longer
  works for non-root users.  Given that the cdrkit package itself has
  not changed (version 9:1.1.11-3ubuntu2), the most likely culprit is in
  the Linux kernel (Bionic, currently linux-image-4.15.0-20-generic
  4.15.0-20.21).

  In particular, running "wodim -v -dao -audio -copy *.wav" as a non-
  root user under Bionic now generates the following; this previously
  worked correctly in Artful and prior releases of Ubuntu:

  TOC Type: 0 = CD-DA
  wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
  wodim: Resource temporarily unavailable. Cannot get mmap for 12587008 Bytes on /dev/zero.

  The exit code is 11.

  Note that the user in question is a member of the cdrom group, and
  running "ls -la /dev/sr0" gives:

  brw-rw----+ 1 root cdrom 11, 0 May  8 18:39 /dev/sr0

  Attached is an strace of running the above command line.  I could not
  find any workaround by a reasonably quick search of the Internet.

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