[PATCH] qemu: virtiofs: support <sandbox mode='chroot'/>
Cole Robinson
crobinso at redhat.com
Fri Mar 26 15:37:48 UTC 2021
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=06844584b62a43384642f7243b0fc01c9fff0fc7
Signed-off-by: Cole Robinson <crobinso at 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(+)
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` )
``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;
virDomainVirtioOptionsPtr virtio;
virObjectPtr privateData;
};
@@ -3800,6 +3809,7 @@ VIR_ENUM_DECL(virDomainFSAccessMode);
VIR_ENUM_DECL(virDomainFSWrpolicy);
VIR_ENUM_DECL(virDomainFSModel);
VIR_ENUM_DECL(virDomainFSCacheMode);
+VIR_ENUM_DECL(virDomainFSSandboxMode);
VIR_ENUM_DECL(virDomainNet);
VIR_ENUM_DECL(virDomainNetBackend);
VIR_ENUM_DECL(virDomainNetVirtioTxMode);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index cb9fe7c80a..04b2bc9dcd 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -414,6 +414,7 @@ virDomainFSDriverTypeToString;
virDomainFSIndexByName;
virDomainFSInsert;
virDomainFSRemove;
+virDomainFSSandboxModeTypeToString;
virDomainFSTypeFromString;
virDomainFSTypeToString;
virDomainFSWrpolicyTypeFromString;
diff --git a/src/qemu/qemu_virtiofs.c b/src/qemu/qemu_virtiofs.c
index 2e239cad66..988b757d6f 100644
--- a/src/qemu/qemu_virtiofs.c
+++ b/src/qemu/qemu_virtiofs.c
@@ -131,6 +131,8 @@ qemuVirtioFSBuildCommandLine(virQEMUDriverConfigPtr cfg,
virQEMUBuildBufferEscapeComma(&opts, fs->src->path);
if (fs->cache)
virBufferAsprintf(&opts, ",cache=%s", virDomainFSCacheModeTypeToString(fs->cache));
+ if (fs->sandbox)
+ virBufferAsprintf(&opts, ",sandbox=%s", virDomainFSSandboxModeTypeToString(fs->sandbox));
if (fs->xattr == VIR_TRISTATE_SWITCH_ON)
virBufferAddLit(&opts, ",xattr");
diff --git a/tests/qemuxml2argvdata/vhost-user-fs-fd-memory.xml b/tests/qemuxml2argvdata/vhost-user-fs-fd-memory.xml
index 2277850c2c..abddf0870b 100644
--- a/tests/qemuxml2argvdata/vhost-user-fs-fd-memory.xml
+++ b/tests/qemuxml2argvdata/vhost-user-fs-fd-memory.xml
@@ -30,6 +30,7 @@
<driver type='virtiofs' queue='1024'/>
<binary path='/usr/libexec/virtiofsd' xattr='on'>
<cache mode='always'/>
+ <sandbox mode='chroot'/>
<lock posix='off' flock='off'/>
</binary>
<source dir='/path'/>
--
2.30.2
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