[Bug 1674258] Re: lscpu crashs when /dev/mem is not stable to read

[Ike Panhc]

ubuntu at rare-fowl:~$ sudo dpkg -i util-linux_2.27.1-6ubuntu3.2_arm64.deb
...
ubuntu at rare-fowl:~$ sudo lscpu
Segmentation fault (core dumped)
ubuntu at rare-fowl:~$ sudo dpkg -i util-linux_2.27.1-6ubuntu3.3_arm64.deb
...
ubuntu at rare-fowl:~$ sudo lscpu
Architecture:          aarch64
Byte Order:            Little Endian
CPU(s):                64
On-line CPU(s) list:   0-63
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             16
NUMA node(s):          4
NUMA node0 CPU(s):     0-15
NUMA node1 CPU(s):     16-31
NUMA node2 CPU(s):     32-47
NUMA node3 CPU(s):     48-63

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https://bugs.launchpad.net/bugs/1674258

Title:
  lscpu crashs when /dev/mem is not stable to read

Status in util-linux package in Ubuntu:
  Fix Released
Status in util-linux source package in Xenial:
  Fix Committed
Status in util-linux source package in Yakkety:
  Fix Committed
Status in util-linux source package in Zesty:
  Fix Committed

Bug description:
  [Impact]

   * Read from /dev/mem and scan DMI tables is dangerous, if /dev/mem is
  not stable to read, it will cause lscpu crash.

  [Test Case]

   * `sudo lscpu` shall not cause Segmentation fault (core dumped)

  [Regression Potential]

   * Reading from DMI tables is sysfs is more stable then reading from
  /dev/mem and if DMI tables is not available lscpu will use the old way
  to search in /dev/mem. I believe its low regression risk

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