Public bug reported:
The 'sshd' process gets 'authentication failure' and refuses to allow
any login.
dmesg indicates that the problem is SIGSYS on a call to 'socket'
(syscall #41, signal #31).
On a hunch, I decided to test whether the problem is related to
'seccomp' and changed /etc/ssh/sshd_config from the default
# UsePrivilegeSeparation sandbox
to the former standard value
UsePrivilegeSeparation yes
and logins started to work again.
Obviously, I'd like to have the additional protection that sandboxing
would give me.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: openssh-server 1:7.4p1-10
ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
Uname: Linux 4.10.0-20-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri May 12 21:06:20 2017
InstallationDate: Installed on 2017-04-08 (35 days ago)
InstallationMedia:
SourcePackage: openssh
UpgradeStatus: Upgraded to zesty on 2017-04-24 (19 days ago)
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug zesty
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https://bugs.launchpad.net/bugs/1690485
Title:
openssh-server SIGSYS with 'UsePrivilegeSeparation sandbox'
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