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[Launchpad Bug Tracker <1726394@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qemu - 1:2.10+dfsg-0ubuntu4

---------------
qemu (1:2.10+dfsg-0ubuntu4) bionic; urgency=medium

  * Apply linux-user-return-EINVAL-from-prctl-PR_-_SECCOMP.patch from
    James Cowgill to prevent qemu-user from forwarding prctl seccomp
    calls (LP: #1726394)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Sat, 04 Nov 2017 00:21:14
+0100

** Changed in: qemu (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1726394

Title:
  Passes through prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, address)

Status in QEMU:
  In Progress
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Xenial:
  Won't Fix
Status in qemu source package in Zesty:
  Won't Fix
Status in qemu source package in Artful:
  Won't Fix
Status in qemu package in Debian:
  Confirmed

Bug description:
  qemu-user passes through prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
  address) unmodified, but the third argument is an address to a BPF
  filter, causing an EFAULT. Now, the filter is architecture-specifc, so
  you can't just rewrite the addresses, so the safest bet is to just
  return an error here.

  I guess you should just return EINVAL, but not sure. I'd really like
  something that can be identified, so seccomp errors can be ignored
  when it's not supported.

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