** Changed in: systemd (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1933402
Title:
net card set VF and altname display blurred character
Status in kunpeng920:
New
Status in kunpeng920 ubuntu-20.04-hwe series:
New
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Focal:
Fix Committed
Status in systemd source package in Groovy:
Fix Released
Status in systemd source package in Hirsute:
Fix Released
Status in systemd source package in Impish:
Fix Released
Bug description:
[Impact]
When running with the HWE kernel (5.4 didn't support altnames), altnames
containing garbage (uninitialized memory) may get assigned to a NIC. This is
100% reproducible on arm64. The upstream commit message suggests that this has
been seen to cause segfaults.
[Test Case]
1) echo 1 > /sys/class/net/enp189s0f0/device/sriov_numvfs
2) ip a
3)
10: eno1v0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group
default qlen 1000
link/ether 1e:d8:e1:e9:ae:25 brd ff:ff:ff:ff:ff:ff
altname @▒ު▒
altname enp125s0f0v0
11: enp189s0f0v0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group
default qlen 1000
link/ether 76:ea:f4:65:dd:33 brd ff:ff:ff:ff:ff:ff
altname ▒b▒ު▒
altname ▒▒▒▒▒▒
[Fix]
There's a one liner upstream fix that simply initializes a variable:
https://github.com/systemd/systemd/commit/61fd7d6720c562c88ab79062ff8d131e5e3c7b1b
[What Could Go Wrong]
The fix itself is innocuous - just initializing a variable to NULL. So the
real risk here would seem to be limited to the common risks in updating a core
package in the Ubuntu distribution.
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