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[Qemu-devel] [Bug 1785902] Re: local/9pfs: Too many levels of symbolic l

From: Enrico Weigelt, metux IT consult
Subject: [Qemu-devel] [Bug 1785902] Re: local/9pfs: Too many levels of symbolic links
Date: Wed, 08 Aug 2018 05:39:53 -0000

Turned out that security_model=mapped can't cope with symlinks in the
host file system.

Instead, security_model=passthrough works as expected. OTOH, I'll have
to check, whether this mode already provides a safe chroot, or guest can
escape and damage the host system.

The wiki page needs some more documentation on that:

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  local/9pfs: Too many levels of symbolic links

Status in QEMU:

Bug description:
  Version: 2.9.1

  The primary symptom is resolving symlink fails w/ error "too many
  levels of symbolic links".

  My analysis showed that local_readlink() uses local_open_nofollow() to
  open the file and then tries to read it. local_open_nofollow() then
  tries to open the file w/ O_NOFOLLOW, which obviously fails if the
  requested file is a symlink.

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