mirror of https://gitee.com/openkylin/qemu.git
virtfs-proxy-helper: Convert documentation to rST
The virtfs-proxy-helper documentation is currently in fsdev/qemu-trace-stap.texi in Texinfo format, which we present to the user as: * a virtfs-proxy-helper manpage * but not (unusually for QEMU) part of the HTML docs Convert the documentation to rST format that lives in the docs/ subdirectory, and present it to the user as: * a virtfs-proxy-helper manpage * part of the interop/ Sphinx manual There are minor formatting changes to suit Sphinx, but no content changes. In particular I've split the -u and -g options into each having their own description text. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Acked-by: Greg Kurz <groug@kaod.org> Message-id: 20200124162606.8787-9-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell
parent
605ffebb2e
commit
78813586b0
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@ -1574,6 +1574,7 @@ S: Odd Fixes
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F: hw/9pfs/
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X: hw/9pfs/xen-9p*
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F: fsdev/
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F: docs/interop/virtfs-proxy-helper.rst
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F: tests/qtest/virtio-9p-test.c
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T: git https://github.com/gkurz/qemu.git 9p-next
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7
Makefile
7
Makefile
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@ -354,7 +354,7 @@ DOCS+=docs/interop/qemu-ga-ref.html docs/interop/qemu-ga-ref.txt docs/interop/qe
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DOCS+=docs/qemu-cpu-models.7
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DOCS+=$(MANUAL_BUILDDIR)/index.html
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ifdef CONFIG_VIRTFS
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DOCS+=fsdev/virtfs-proxy-helper.1
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DOCS+=$(MANUAL_BUILDDIR)/interop/virtfs-proxy-helper.1
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endif
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ifdef CONFIG_TRACE_SYSTEMTAP
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DOCS+=$(MANUAL_BUILDDIR)/interop/qemu-trace-stap.1
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@ -859,7 +859,7 @@ endif
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endif
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ifdef CONFIG_VIRTFS
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$(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1"
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$(INSTALL_DATA) fsdev/virtfs-proxy-helper.1 "$(DESTDIR)$(mandir)/man1"
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$(INSTALL_DATA) $(MANUAL_BUILDDIR)/interop/virtfs-proxy-helper.1 "$(DESTDIR)$(mandir)/man1"
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endif
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install-datadir:
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@ -1051,7 +1051,7 @@ $(MANUAL_BUILDDIR)/system/index.html: $(call manual-deps,system)
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$(call build-manual,system,html)
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$(call define-manpage-rule,interop,\
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qemu-ga.8 qemu-img.1 qemu-nbd.8 qemu-trace-stap.1,\
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qemu-ga.8 qemu-img.1 qemu-nbd.8 qemu-trace-stap.1 virtfs-proxy-helper.1,\
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$(SRC_PATH/qemu-img-cmds.hx))
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$(call define-manpage-rule,system,qemu-block-drivers.7)
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@ -1078,7 +1078,6 @@ docs/interop/qemu-ga-qapi.texi: qga/qapi-generated/qga-qapi-doc.texi
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qemu.1: qemu-doc.texi qemu-options.texi qemu-monitor.texi qemu-monitor-info.texi
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qemu.1: qemu-option-trace.texi
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fsdev/virtfs-proxy-helper.1: fsdev/virtfs-proxy-helper.texi
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docs/qemu-cpu-models.7: docs/qemu-cpu-models.texi
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html: qemu-doc.html docs/interop/qemu-qmp-ref.html docs/interop/qemu-ga-ref.html sphinxdocs
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@ -24,5 +24,8 @@
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('qemu-nbd', 'qemu-nbd', u'QEMU Disk Network Block Device Server',
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['Anthony Liguori <anthony@codemonkey.ws>'], 8),
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('qemu-trace-stap', 'qemu-trace-stap', u'QEMU SystemTap trace tool',
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[], 1)
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[], 1),
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('virtfs-proxy-helper', 'virtfs-proxy-helper',
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u'QEMU 9p virtfs proxy filesystem helper',
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['M. Mohan Kumar'], 1)
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]
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@ -23,3 +23,4 @@ Contents:
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qemu-trace-stap
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vhost-user
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vhost-user-gpu
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virtfs-proxy-helper
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@ -0,0 +1,72 @@
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QEMU 9p virtfs proxy filesystem helper
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======================================
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Synopsis
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--------
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**virtfs-proxy-helper** [*OPTIONS*]
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Description
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-----------
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Pass-through security model in QEMU 9p server needs root privilege to do
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few file operations (like chown, chmod to any mode/uid:gid). There are two
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issues in pass-through security model:
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- TOCTTOU vulnerability: Following symbolic links in the server could
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provide access to files beyond 9p export path.
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- Running QEMU with root privilege could be a security issue.
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To overcome above issues, following approach is used: A new filesystem
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type 'proxy' is introduced. Proxy FS uses chroot + socket combination
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for securing the vulnerability known with following symbolic links.
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Intention of adding a new filesystem type is to allow qemu to run
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in non-root mode, but doing privileged operations using socket IO.
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Proxy helper (a stand alone binary part of qemu) is invoked with
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root privileges. Proxy helper chroots into 9p export path and creates
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a socket pair or a named socket based on the command line parameter.
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QEMU and proxy helper communicate using this socket. QEMU proxy fs
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driver sends filesystem request to proxy helper and receives the
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response from it.
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The proxy helper is designed so that it can drop root privileges except
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for the capabilities needed for doing filesystem operations.
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Options
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-------
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The following options are supported:
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.. program:: virtfs-proxy-helper
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.. option:: -h
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Display help and exit
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.. option:: -p, --path PATH
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Path to export for proxy filesystem driver
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.. option:: -f, --fd SOCKET_ID
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Use given file descriptor as socket descriptor for communicating with
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qemu proxy fs drier. Usually a helper like libvirt will create
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socketpair and pass one of the fds as parameter to this option.
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.. option:: -s, --socket SOCKET_FILE
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Creates named socket file for communicating with qemu proxy fs driver
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.. option:: -u, --uid UID
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uid to give access to named socket file; used in combination with -g.
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.. option:: -g, --gid GID
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gid to give access to named socket file; used in combination with -u.
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.. option:: -n, --nodaemon
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Run as a normal program. By default program will run in daemon mode
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@ -1,63 +0,0 @@
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@example
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@c man begin SYNOPSIS
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@command{virtfs-proxy-helper} @var{options}
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@c man end
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@end example
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@c man begin DESCRIPTION
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@table @description
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Pass-through security model in QEMU 9p server needs root privilege to do
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few file operations (like chown, chmod to any mode/uid:gid). There are two
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issues in pass-through security model
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1) TOCTTOU vulnerability: Following symbolic links in the server could
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provide access to files beyond 9p export path.
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2) Running QEMU with root privilege could be a security issue.
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To overcome above issues, following approach is used: A new filesystem
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type 'proxy' is introduced. Proxy FS uses chroot + socket combination
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for securing the vulnerability known with following symbolic links.
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Intention of adding a new filesystem type is to allow qemu to run
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in non-root mode, but doing privileged operations using socket IO.
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Proxy helper(a stand alone binary part of qemu) is invoked with
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root privileges. Proxy helper chroots into 9p export path and creates
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a socket pair or a named socket based on the command line parameter.
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QEMU and proxy helper communicate using this socket. QEMU proxy fs
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driver sends filesystem request to proxy helper and receives the
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response from it.
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The proxy helper is designed so that it can drop root privileges except
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for the capabilities needed for doing filesystem operations.
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@end table
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@c man end
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@c man begin OPTIONS
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The following options are supported:
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@table @option
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@item -h
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@findex -h
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Display help and exit
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@item -p|--path path
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Path to export for proxy filesystem driver
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@item -f|--fd socket-id
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Use given file descriptor as socket descriptor for communicating with
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qemu proxy fs drier. Usually a helper like libvirt will create
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socketpair and pass one of the fds as parameter to -f|--fd
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@item -s|--socket socket-file
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Creates named socket file for communicating with qemu proxy fs driver
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@item -u|--uid uid -g|--gid gid
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uid:gid combination to give access to named socket file
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@item -n|--nodaemon
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Run as a normal program. By default program will run in daemon mode
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@end table
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@c man end
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@setfilename virtfs-proxy-helper
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@settitle QEMU 9p virtfs proxy filesystem helper
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@c man begin AUTHOR
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M. Mohan Kumar
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@c man end
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