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

[Ike Panhc]

[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

[Ike Panhc (ikepanhc)]

upstream patch found.

https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=92a6392c41c11bcb49af9f129dfbd1fed651f044

[Launchpad Janitor (janitor)]

This bug was fixed in the package util-linux - 2.29-1ubuntu3

---------------
util-linux (2.29-1ubuntu3) artful; urgency=medium

  * Cherrypick upstream fix to prevent lscpu crash on arm64 by
    accessing DMI in sysfs instead of /dev/mem. LP: #1674258

 -- Ike Panhc <email address hidden> Thu, 18 May 2017 10:49:34 +0800

[Chris J Arges (arges)]

Hello Ike, or anyone else affected,

Accepted util-linux into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/util-linux/2.27.1-6ubuntu3.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Chris J Arges (arges)]

Hello Ike, or anyone else affected,

Accepted util-linux into yakkety-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/util-linux/2.28.2-1ubuntu1.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Chris J Arges (arges)]

Hello Ike, or anyone else affected,

Accepted util-linux into zesty-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/util-linux/2.29-1ubuntu2.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Ike Panhc (ikepanhc)]

ubuntu@rare-fowl:~$ sudo dpkg -i util-linux_2.27.1-6ubuntu3.2_arm64.deb
...
ubuntu@rare-fowl:~$ sudo lscpu
Segmentation fault (core dumped)
ubuntu@rare-fowl:~$ sudo dpkg -i util-linux_2.27.1-6ubuntu3.3_arm64.deb
...
ubuntu@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

[Ike Panhc (ikepanhc)]

ubuntu@rare-fowl:~$ sudo dpkg -i --force-depends --auto-deconfigure util-linux_2.28.2-1ubuntu1.1_arm64.deb
...
ubuntu@rare-fowl:~$ sudo lscpu
Segmentation fault (core dumped)
ubuntu@rare-fowl:~$ sudo dpkg -i --force-depends --auto-deconfigure util-linux_2.28.2-1ubuntu1.2_arm64.deb
...
ubuntu@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

[Ike Panhc (ikepanhc)]

ubuntu@rare-fowl:~$ sudo dpkg -i --force-depends --auto-deconfigure util-linux_2.29-1ubuntu2_arm64.deb
...
ubuntu@rare-fowl:~$ sudo lscpu
Segmentation fault (core dumped)
ubuntu@rare-fowl:~$ sudo dpkg -i --force-depends --auto-deconfigure util-linux_2.29-1ubuntu2.1_arm64.deb
...
ubuntu@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

[Ike Panhc (ikepanhc)]

2.27.1-6ubuntu3.3 in Xenial, 2.28.2-1ubuntu1.2 in Yakkety and 2.29-1ubuntu2.1 in Zesty has fix the problem.

[Launchpad Janitor (janitor)]

This bug was fixed in the package util-linux - 2.27.1-6ubuntu3.3

---------------
util-linux (2.27.1-6ubuntu3.3) xenial; urgency=medium

  * Cherrypick upstream fix to prevent lscpu crash on arm64 by
    accessing DMI in sysfs instead of /dev/mem. LP: #1674258

 -- Ike Panhc <email address hidden> Thu, 18 May 2017 10:49:34 +0800

[Chris Halse Rogers (raof)]

The verification of the Stable Release Update for util-linux has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package util-linux - 2.28.2-1ubuntu1.2

---------------
util-linux (2.28.2-1ubuntu1.2) yakkety; urgency=medium

  * Cherrypick upstream fix to prevent lscpu crash on arm64 by
    accessing DMI in sysfs instead of /dev/mem. LP: #1674258

 -- Ike Panhc <email address hidden> Thu, 18 May 2017 10:49:34 +0800

[Launchpad Janitor (janitor)]

This bug was fixed in the package util-linux - 2.29-1ubuntu2.1

---------------
util-linux (2.29-1ubuntu2.1) zesty; urgency=medium

  * Cherrypick upstream fix to prevent lscpu crash on arm64 by
    accessing DMI in sysfs instead of /dev/mem. LP: #1674258

 -- Ike Panhc <email address hidden> Thu, 18 May 2017 10:49:34 +0800