** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1772671
Title:
Kernel produces empty lines in /proc/PID/status
Status in iotop package in Ubuntu:
Invalid
Status in linux package in Ubuntu:
Invalid
Status in iotop source package in Xenial:
Invalid
Status in linux source package in Xenial:
Fix Committed
Bug description:
[Impact]
The CVE-2018-3639 for Xenial introduced a double newline sequence in the
/proc/PID/status files. This breaks some userspace tools, such as iotop, that
parse those files.
[Test Case]
Incorrect output in 4.4.0-127.153-generic:
$ cat /proc/self/status
...
Seccomp: 0
Speculation_Store_Bypass: thread vulnerable
...
Expected output:
$ cat /proc/self/status
...
Seccomp: 0
Speculation_Store_Bypass: thread vulnerable
...
[Regression Potential]
None
[Original Report]
Hello,
after running updates today to linux-
image-4.4.0-127-generic_4.4.0-127.153 and rebooting i noticed that
iotop is not working any more. Reason are empty lines in
/proc/PID/status, which confuse iotop (and me)
In new view there is an empy line between Seccomp and
Speculation_Store_Bypass:
####
Seccomp: 0
Speculation_Store_Bypass: vulnerable
####
Speculation_Store_Bypass seems to be new in /proc/PID/status, may be a
relation to spectre/meltdown patches.
iotop is first application which is failing here, but iam afraid of
more.
Thanks
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