[Qemu-devel] [Bug 1726394] Re: Passes through prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, address)

[Julian Andres Klode]

I worked around this in APT for now by ignoring EFAULT or rather,
printing a warning. It would be nice to not do this though.

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Medium

** Changed in: qemu (Ubuntu)
       Status: New => Triaged

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

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

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Triaged

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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