From f121962023596527c9ec798950044b723ca4857e Mon Sep 17 00:00:00 2001 Message-Id: From: Michal Privoznik Date: Mon, 11 Nov 2013 17:12:59 +0100 Subject: [PATCH] virSecurityLabelDefParseXML: Don't parse label on model='none' RHEL-7.0: https://bugzilla.redhat.com/show_bug.cgi?id=1028962 RHEL-6.6: https://bugzilla.redhat.com/show_bug.cgi?id=1027096 If there's the following snippet in the domain XML, the domain will be lost upon the daemon restart (if the domain is started prior restart): The problem is, the 'label', 'imagelabel' and 'baselabel' are parsed whenever the VIR_DOMAIN_XML_INACTIVE is *not* present or the label is static. The latter is not our case, obviously. So, when libvirtd starts up, it finds domain state xml and parse it. During parsing, many XML flags are enabled but VIR_DOMAIN_XML_INACTIVE. Hence, our parser tries to extract 'label', 'imagelabel' and 'baselabel' from the XML which fails for model='none'. Err, this model - even though not specified in XML - can be taken from qemu wide config file: /etc/libvirtd/qemu.conf. However, in order to know we are dealing with model='none' the code in question must be moved forward a bit. Then a new check must be introduced. This is what the first two chunks are doing. But this alone is not sufficient. The domain state XML won't contain the model attribute without slight modification. The model should be inserted into the XML even if equal to 'none' and the state XML is being generated - what if the origin (the @security_driver variable in qemu.conf) changes during libvirtd restarts? At the end, a test to catch this scenario is introduced. Signed-off-by: Michal Privoznik (cherry picked from commit 9fb3f9571db4bd20b8287a160e9b2680f23dde45) Signed-off-by: Jiri Denemark --- src/conf/domain_conf.c | 26 +++++++++++++------- .../qemuxml2argv-seclabel-dynamic-relabel.args | 6 +++++ .../qemuxml2argv-seclabel-dynamic-relabel.xml | 28 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + tests/qemuxml2xmltest.c | 1 + 5 files changed, 54 insertions(+), 8 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.xml diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 57a82b6..8307fee 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -4350,6 +4350,17 @@ virSecurityLabelDefParseXML(xmlXPathContextPtr ctxt, def->norelabel = false; } + /* Always parse model */ + p = virXPathStringLimit("string(./@model)", + VIR_SECURITY_MODEL_BUFLEN-1, ctxt); + def->model = p; + + /* For the model 'none' none of the following labels is going to be + * present. Hence, return now. */ + + if (STREQ_NULLABLE(def->model, "none")) + return def; + /* Only parse label, if using static labels, or * if the 'live' VM XML is requested */ @@ -4388,11 +4399,6 @@ virSecurityLabelDefParseXML(xmlXPathContextPtr ctxt, def->baselabel = p; } - /* Always parse model */ - p = virXPathStringLimit("string(./@model)", - VIR_SECURITY_MODEL_BUFLEN-1, ctxt); - def->model = p; - return def; error: @@ -14092,7 +14098,9 @@ virDomainEventActionDefFormat(virBufferPtr buf, static void -virSecurityLabelDefFormat(virBufferPtr buf, virSecurityLabelDefPtr def) +virSecurityLabelDefFormat(virBufferPtr buf, + virSecurityLabelDefPtr def, + unsigned flags) { const char *sectype = virDomainSeclabelTypeToString(def->type); @@ -14111,7 +14119,9 @@ virSecurityLabelDefFormat(virBufferPtr buf, virSecurityLabelDefPtr def) virBufferAsprintf(buf, "model && STRNEQ(def->model, "none")) + /* When generating state XML do include the model */ + if (flags & VIR_DOMAIN_XML_INTERNAL_STATUS || + STRNEQ_NULLABLE(def->model, "none")) virBufferEscapeString(buf, " model='%s'", def->model); if (def->type == VIR_DOMAIN_SECLABEL_NONE) { @@ -17006,7 +17016,7 @@ virDomainDefFormatInternal(virDomainDefPtr def, virBufferAdjustIndent(buf, 2); for (n = 0; n < def->nseclabels; n++) - virSecurityLabelDefFormat(buf, def->seclabels[n]); + virSecurityLabelDefFormat(buf, def->seclabels[n], flags); virBufferAdjustIndent(buf, -2); if (def->namespaceData && def->ns.format) { diff --git a/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.args b/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.args new file mode 100644 index 0000000..5bbde17 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.args @@ -0,0 +1,6 @@ +LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \ +/usr/bin/qemu \ +-name QEMUGuest1 -S -M pc -m 214 -smp 1 -nographic -monitor \ +unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -usb \ +-hda /dev/HostVG/QEMUGuest1 -net none -serial \ +none -parallel none diff --git a/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.xml b/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.xml new file mode 100644 index 0000000..cb74239 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-relabel.xml @@ -0,0 +1,28 @@ + + QEMUGuest1 + c7a5fdbd-edaf-9455-926a-d65c16db1809 + 219100 + 219100 + 1 + + hvm + + + + destroy + restart + destroy + + /usr/bin/qemu + + + +
+ + + + + + + + diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index 2f05727..cfaee71 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -939,6 +939,7 @@ mymain(void) DO_TEST("seclabel-dynamic-baselabel", QEMU_CAPS_NAME); DO_TEST("seclabel-dynamic-override", QEMU_CAPS_NAME); DO_TEST("seclabel-dynamic-labelskip", QEMU_CAPS_NAME); + DO_TEST("seclabel-dynamic-relabel", QEMU_CAPS_NAME); DO_TEST("seclabel-static", QEMU_CAPS_NAME); DO_TEST("seclabel-static-relabel", QEMU_CAPS_NAME); DO_TEST("seclabel-static-labelskip", QEMU_CAPS_NAME); diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c index 5a47ef8..6b984ad 100644 --- a/tests/qemuxml2xmltest.c +++ b/tests/qemuxml2xmltest.c @@ -260,6 +260,7 @@ mymain(void) DO_TEST_FULL("seclabel-dynamic-baselabel", false, WHEN_INACTIVE); DO_TEST_FULL("seclabel-dynamic-override", false, WHEN_INACTIVE); DO_TEST_FULL("seclabel-dynamic-labelskip", true, WHEN_INACTIVE); + DO_TEST_FULL("seclabel-dynamic-relabel", false, WHEN_INACTIVE); DO_TEST("seclabel-static"); DO_TEST_FULL("seclabel-static-labelskip", false, WHEN_ACTIVE); DO_TEST("seclabel-none"); -- 1.8.4.4