On Fri, Mar 26, 2021 at 11:37:48 -0400, Cole Robinson wrote:
Add a new XML element
<filesystem> <binary> <sandbox mode='chroot|namespace'/> </binary> </filesystem>
Which maps to `virtiofsd -o sandbox=chroot|namespace`, which was added in qemu 5.2.0:
https://git.qemu.org/?p=qemu.git;a=commit;h=06844584b62a43384642f7243b0fc01c...
Signed-off-by: Cole Robinson <crobinso@redhat.com> --- docs/formatdomain.rst | 4 ++++ docs/schemas/domaincommon.rng | 12 ++++++++++ src/conf/domain_conf.c | 23 +++++++++++++++++++ src/conf/domain_conf.h | 10 ++++++++ src/libvirt_private.syms | 1 + src/qemu/qemu_virtiofs.c | 2 ++ .../vhost-user-fs-fd-memory.xml | 1 + 7 files changed, 53 insertions(+)
Please split the commit as it's usual for libvirt patches. Also a test case modifying any of the .args files in qemuxml2argv test is missing.
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 9392c80113..9dda39dbcb 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -3234,6 +3234,7 @@ A directory on the host that can be accessed directly from the guest. <driver type='virtiofs' queue='1024'/> <binary path='/usr/libexec/virtiofsd' xattr='on'> <cache mode='always'/> + <sandbox mode='namespace'/> <lock posix='on' flock='on'/> </binary> <source dir='/path'/> @@ -3358,6 +3359,9 @@ A directory on the host that can be accessed directly from the guest. ``cache`` element, possible ``mode`` values being ``none`` and ``always``. Locking can be controlled via the ``lock`` element - attributes ``posix`` and ``flock`` both accepting values ``on`` or ``off``. ( :since:`Since 6.2.0` ) + The sandboxing method used by virtiofsd can be configured with the ``sandbox`` + element, possible ``mode`` values being ``namespace`` and + ``chroot``. ( :since:`Since 7.2.0` )
Is there any reasonable short explanation of differences? Or perhaps link to virtiofs docs to clarify what that the modes do?
``source`` The resource on the host that is being accessed in the guest. The ``name`` attribute must be used with ``type='template'``, and the ``dir`` attribute diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index 1dbfc68f18..6404ebf210 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -2960,6 +2960,18 @@ </optional> </element> </optional> + <optional> + <element name="sandbox"> + <optional> + <attribute name="mode"> + <choice> + <value>namespace</value> + <value>chroot</value> + </choice> + </attribute> + </optional> + </element> + </optional> <optional> <element name="lock"> <optional> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index b0eba9f7bd..70a900ee25 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -538,6 +538,13 @@ VIR_ENUM_IMPL(virDomainFSCacheMode, "always", );
+VIR_ENUM_IMPL(virDomainFSSandboxMode, + VIR_DOMAIN_FS_SANDBOX_MODE_LAST, + "default", + "namespace", + "chroot", +); +
VIR_ENUM_IMPL(virDomainNet, VIR_DOMAIN_NET_TYPE_LAST, @@ -10373,6 +10380,7 @@ virDomainFSDefParseXML(virDomainXMLOptionPtr xmlopt, g_autofree char *binary = virXPathString("string(./binary/@path)", ctxt); g_autofree char *xattr = virXPathString("string(./binary/@xattr)", ctxt); g_autofree char *cache = virXPathString("string(./binary/cache/@mode)", ctxt); + g_autofree char *sandbox = virXPathString("string(./binary/sandbox/@mode)", ctxt); g_autofree char *posix_lock = virXPathString("string(./binary/lock/@posix)", ctxt); g_autofree char *flock = virXPathString("string(./binary/lock/@flock)", ctxt); int val; @@ -10406,6 +10414,16 @@ virDomainFSDefParseXML(virDomainXMLOptionPtr xmlopt, def->cache = val; }
+ if (sandbox) { + if ((val = virDomainFSSandboxModeTypeFromString(sandbox)) <= 0) { + virReportError(VIR_ERR_XML_ERROR, + _("cannot parse sandbox mode '%s' for virtiofs"), + sandbox); + goto error; + } + def->sandbox = val; + } + if (posix_lock) { if ((val = virTristateSwitchTypeFromString(posix_lock)) <= 0) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, @@ -25483,6 +25501,11 @@ virDomainFSDefFormat(virBufferPtr buf, virDomainFSCacheModeTypeToString(def->cache)); }
+ if (def->sandbox != VIR_DOMAIN_FS_SANDBOX_MODE_DEFAULT) { + virBufferAsprintf(&binaryBuf, "<sandbox mode='%s'/>\n", + virDomainFSSandboxModeTypeToString(def->sandbox)); + } + if (def->posix_lock != VIR_TRISTATE_SWITCH_ABSENT) { virBufferAsprintf(&lockAttrBuf, " posix='%s'", virTristateSwitchTypeToString(def->posix_lock)); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 0b8895bbdf..d77b04847b 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -846,6 +846,14 @@ typedef enum { VIR_DOMAIN_FS_CACHE_MODE_LAST } virDomainFSCacheMode;
+typedef enum { + VIR_DOMAIN_FS_SANDBOX_MODE_DEFAULT = 0, + VIR_DOMAIN_FS_SANDBOX_MODE_NAMESPACE, + VIR_DOMAIN_FS_SANDBOX_MODE_CHROOT, + + VIR_DOMAIN_FS_SANDBOX_MODE_LAST +} virDomainFSSandboxMode; + struct _virDomainFSDef { int type; int fsdriver; /* enum virDomainFSDriverType */ @@ -870,6 +878,7 @@ struct _virDomainFSDef { virDomainFSCacheMode cache; virTristateSwitch posix_lock; virTristateSwitch flock; + virDomainFSSandboxMode sandbox;
validation check rejecting sandbox modes for 9p fs is missing
virDomainVirtioOptionsPtr virtio; virObjectPtr privateData; };