[libvirt] [PATCH 2/3] qemu: don't use vmdef without domain lock
Nikolay Shirokovskiy
nshirokovskiy at virtuozzo.com
Thu Nov 24 09:19:22 UTC 2016
Current call to qemuAgentGetFSInfo in qemuDomainGetFSInfo is
unsafe. Domain lock is dropped and we use vm->def. To fix that
let's fill in intermediate qemuAgentFsInfo structure in
qemuAgentGetFSInfo and use vm->def to convert result later when
lock is hold.
---
src/qemu/qemu_agent.c | 52 +++++++++++--------
src/qemu/qemu_agent.h | 25 ++++++++-
src/qemu/qemu_driver.c | 88 +++++++++++++++++++++++++++++++-
tests/Makefile.am | 1 -
tests/qemuagentdata/qemuagent-fsinfo.xml | 39 --------------
tests/qemuagenttest.c | 47 +++++++----------
6 files changed, 159 insertions(+), 93 deletions(-)
delete mode 100644 tests/qemuagentdata/qemuagent-fsinfo.xml
diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index c5cf403..5230cbc 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -1835,18 +1835,15 @@ qemuAgentSetTime(qemuAgentPtr mon,
int
-qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
- virDomainDefPtr vmdef)
+qemuAgentGetFSInfo(qemuAgentPtr mon, qemuAgentFsInfoPtr **info)
{
size_t i, j, k;
int ret = -1;
ssize_t ndata = 0, ndisk;
- char **alias;
virJSONValuePtr cmd;
virJSONValuePtr reply = NULL;
virJSONValuePtr data;
- virDomainFSInfoPtr *info_ret = NULL;
- virPCIDeviceAddress pci_address;
+ qemuAgentFsInfoPtr *info_ret = NULL;
cmd = qemuAgentMakeCommand("guest-get-fsinfo", NULL);
if (!cmd)
@@ -1879,6 +1876,8 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
goto cleanup;
for (i = 0; i < ndata; i++) {
+ qemuAgentFsDiskAliasPtr alias;
+
/* Reverse the order to arrange in mount order */
virJSONValuePtr entry = virJSONValueArrayGet(data, ndata - 1 - i);
@@ -1941,7 +1940,6 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
int diskaddr[3], pciaddr[4];
const char *diskaddr_comp[] = {"bus", "target", "unit"};
const char *pciaddr_comp[] = {"domain", "bus", "slot", "function"};
- virDomainDiskDefPtr diskDef;
if (!disk) {
virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -1967,6 +1965,11 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
goto cleanup;
}
}
+
+ alias->bus = diskaddr[0];
+ alias->target = diskaddr[1];
+ alias->unit = diskaddr[2];
+
for (k = 0; k < 4; k++) {
if (virJSONValueObjectGetNumberInt(
pci, pciaddr_comp[k], &pciaddr[k]) < 0) {
@@ -1977,22 +1980,13 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
}
}
- pci_address.domain = pciaddr[0];
- pci_address.bus = pciaddr[1];
- pci_address.slot = pciaddr[2];
- pci_address.function = pciaddr[3];
- if (!(diskDef = virDomainDiskByAddress(
- vmdef, &pci_address,
- diskaddr[0], diskaddr[1], diskaddr[2])))
- continue;
+ alias->address.domain = pciaddr[0];
+ alias->address.bus = pciaddr[1];
+ alias->address.slot = pciaddr[2];
+ alias->address.function = pciaddr[3];
- if (VIR_STRDUP(*alias, diskDef->dst) < 0)
- goto cleanup;
-
- if (*alias) {
- alias++;
- info_ret[i]->ndevAlias++;
- }
+ alias++;
+ info_ret[i]->ndevAlias++;
}
}
@@ -2003,7 +1997,7 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
cleanup:
if (info_ret) {
for (i = 0; i < ndata; i++)
- virDomainFSInfoFree(info_ret[i]);
+ qemuAgentFsInfoFree(info_ret[i]);
VIR_FREE(info_ret);
}
virJSONValueFree(cmd);
@@ -2242,3 +2236,17 @@ qemuAgentSetUserPassword(qemuAgentPtr mon,
VIR_FREE(password64);
return ret;
}
+
+void
+qemuAgentFsInfoFree(qemuAgentFsInfoPtr info)
+{
+ if (!info)
+ return;
+
+ VIR_FREE(info->mountpoint);
+ VIR_FREE(info->name);
+ VIR_FREE(info->fstype);
+ VIR_FREE(info->devAlias);
+
+ VIR_FREE(info);
+}
diff --git a/src/qemu/qemu_agent.h b/src/qemu/qemu_agent.h
index 6dd9c70..4b2277c 100644
--- a/src/qemu/qemu_agent.h
+++ b/src/qemu/qemu_agent.h
@@ -75,8 +75,29 @@ int qemuAgentShutdown(qemuAgentPtr mon,
int qemuAgentFSFreeze(qemuAgentPtr mon,
const char **mountpoints, unsigned int nmountpoints);
int qemuAgentFSThaw(qemuAgentPtr mon);
-int qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
- virDomainDefPtr vmdef);
+
+typedef struct _qemuAgentFsDiskAlias qemuAgentFsDiskAlias;
+typedef qemuAgentFsDiskAlias *qemuAgentFsDiskAliasPtr;
+struct _qemuAgentFsDiskAlias {
+ virPCIDeviceAddress address;
+ unsigned int bus;
+ unsigned int target;
+ unsigned int unit;
+};
+
+typedef struct _qemuAgentFsInfo qemuAgentFsInfo;
+typedef qemuAgentFsInfo *qemuAgentFsInfoPtr;
+struct _qemuAgentFsInfo {
+ char *mountpoint; /* path to mount point */
+ char *name; /* device name in the guest (e.g. "sda1") */
+ char *fstype; /* filesystem type */
+ size_t ndevAlias; /* number of elements in devAlias */
+ qemuAgentFsDiskAliasPtr devAlias; /* array of disk device aliases */
+};
+
+void qemuAgentFsInfoFree(qemuAgentFsInfoPtr info);
+
+int qemuAgentGetFSInfo(qemuAgentPtr mon, qemuAgentFsInfoPtr **info);
int qemuAgentSuspend(qemuAgentPtr mon,
unsigned int target);
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index fdfe912..1bc5dc6 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19672,14 +19672,89 @@ qemuNodeAllocPages(virConnectPtr conn,
static int
+qemuDomainConvertFsInfo(qemuAgentFsInfoPtr *agent_info, int num,
+ virDomainDefPtr def,
+ virDomainFSInfoPtr **info)
+{
+ int ret = -1;
+ size_t i;
+ virDomainFSInfoPtr *info_ret = NULL;
+
+ if (num == 0) {
+ *info = NULL;
+ return 0;
+ }
+
+ if (VIR_ALLOC_N(info_ret, num) < 0)
+ return -1;
+
+ for (i = 0; i < num; i++) {
+ size_t j;
+ int devnum;
+
+ if (VIR_ALLOC(info_ret[i]) < 0)
+ goto cleanup;
+
+ if (VIR_STRDUP(info_ret[i]->mountpoint, agent_info[i]->mountpoint) < 0 ||
+ VIR_STRDUP(info_ret[i]->name, agent_info[i]->name) < 0 ||
+ VIR_STRDUP(info_ret[i]->fstype, agent_info[i]->fstype) < 0)
+ goto cleanup;
+
+ if (agent_info[i]->ndevAlias == 0)
+ continue;
+
+ if (VIR_EXPAND_N(info_ret[i]->devAlias,
+ info_ret[i]->ndevAlias,
+ agent_info[i]->ndevAlias) < 0)
+ goto cleanup;
+
+ devnum = 0;
+ for (j = 0; j < agent_info[i]->ndevAlias; j++) {
+ virDomainDiskDefPtr diskDef;
+ qemuAgentFsDiskAliasPtr alias = &agent_info[i]->devAlias[j];
+
+ if (!(diskDef = virDomainDiskByAddress(def, &alias->address,
+ alias->bus, alias->target,
+ alias->unit)))
+ continue;
+
+ if (VIR_STRDUP(info_ret[i]->devAlias[devnum++], diskDef->dst) < 0)
+ goto cleanup;
+ }
+
+ if (devnum < info_ret[i]->ndevAlias)
+ VIR_SHRINK_N(info_ret[i]->devAlias,
+ info_ret[i]->ndevAlias,
+ info_ret[i]->ndevAlias - devnum);
+ }
+
+ *info = info_ret;
+ info_ret = NULL;
+ ret = num;
+
+ cleanup:
+ if (info_ret) {
+ for (i = 0; i < num; i++)
+ virDomainFSInfoFree(info_ret[i]);
+ VIR_FREE(info_ret);
+ }
+
+ return ret;
+}
+
+
+static int
qemuDomainGetFSInfo(virDomainPtr dom,
virDomainFSInfoPtr **info,
unsigned int flags)
{
virQEMUDriverPtr driver = dom->conn->privateData;
+ qemuAgentFsInfoPtr *agent_info = NULL;
virDomainObjPtr vm;
qemuAgentPtr agent;
int ret = -1;
+ int num;
+ size_t i;
virCheckFlags(0, ret);
@@ -19702,13 +19777,24 @@ qemuDomainGetFSInfo(virDomainPtr dom,
goto endjob;
agent = qemuDomainObjEnterAgent(vm);
- ret = qemuAgentGetFSInfo(agent, info, vm->def);
+ num = qemuAgentGetFSInfo(agent, &agent_info);
qemuDomainObjExitAgent(vm, agent);
+ if (num < 0)
+ goto endjob;
+
+ ret = qemuDomainConvertFsInfo(agent_info, num, vm->def, info);
+
endjob:
qemuDomainObjEndJob(driver, vm);
cleanup:
+ if (agent_info) {
+ for (i = 0; i < num; i++)
+ qemuAgentFsInfoFree(agent_info[i]);
+ VIR_FREE(agent_info);
+ }
+
virDomainObjEndAPI(&vm);
return ret;
}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 924029a..d34cc95 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -116,7 +116,6 @@ EXTRA_DIST = \
nwfilterxml2xmlin \
nwfilterxml2xmlout \
oomtrace.pl \
- qemuagentdata \
qemuargv2xmldata \
qemucapabilitiesdata \
qemucaps2xmldata \
diff --git a/tests/qemuagentdata/qemuagent-fsinfo.xml b/tests/qemuagentdata/qemuagent-fsinfo.xml
deleted file mode 100644
index 9638feb..0000000
--- a/tests/qemuagentdata/qemuagent-fsinfo.xml
+++ /dev/null
@@ -1,39 +0,0 @@
-<domain type='qemu'>
- <name>QEMUGuest1</name>
- <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
- <memory unit='KiB'>219136</memory>
- <currentMemory unit='KiB'>219136</currentMemory>
- <vcpu placement='static'>1</vcpu>
- <os>
- <type arch='i686' machine='pc'>hvm</type>
- <boot dev='hd'/>
- </os>
- <clock offset='utc'/>
- <on_poweroff>destroy</on_poweroff>
- <on_reboot>restart</on_reboot>
- <on_crash>destroy</on_crash>
- <devices>
- <emulator>/usr/bin/qemu</emulator>
- <disk type='file' device='disk'>
- <source file='/tmp/idedisk.img'/>
- <target dev='hdc' bus='ide'/>
- <address type='drive' controller='0' bus='1' target='0' unit='0'/>
- </disk>
- <disk type='file' device='disk'>
- <driver name='qemu' type='qcow2'/>
- <source file='/tmp/virtio-blk1.qcow2'/>
- <target dev='vda' bus='virtio'/>
- <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
- </disk>
- <disk type='file' device='disk'>
- <driver name='qemu' type='qcow2'/>
- <source file='/tmp/virtio-blk2.qcow2'/>
- <target dev='vdb' bus='virtio'/>
- <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
- </disk>
- <controller type='ide' index='0'>
- <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
- </controller>
- <memballoon model='virtio'/>
- </devices>
-</domain>
diff --git a/tests/qemuagenttest.c b/tests/qemuagenttest.c
index 5dfa58e..97f340c 100644
--- a/tests/qemuagenttest.c
+++ b/tests/qemuagenttest.c
@@ -169,22 +169,16 @@ testQemuAgentGetFSInfo(const void *data)
virDomainXMLOptionPtr xmlopt = (virDomainXMLOptionPtr)data;
virCapsPtr caps = testQemuCapsInit();
qemuMonitorTestPtr test = qemuMonitorTestNewAgent(xmlopt);
- char *domain_filename = NULL;
- virDomainDefPtr def = NULL;
- virDomainFSInfoPtr *info = NULL;
+ qemuAgentFsInfoPtr *info = NULL;
int ret = -1, ninfo = 0, i;
+ qemuAgentFsDiskAlias alias_sda1 = { { 0, 0, 1, 1, 0 }, 1, 0, 0 };
+ qemuAgentFsDiskAlias alias_vda = { { 0, 0, 6, 0, 0 }, 0, 0, 0 };
+ qemuAgentFsDiskAlias alias_vdb = { { 0, 0, 7, 0, 0 }, 0, 0, 0 };
+
if (!test)
return -1;
- if (virAsprintf(&domain_filename, "%s/qemuagentdata/qemuagent-fsinfo.xml",
- abs_srcdir) < 0)
- goto cleanup;
-
- if (!(def = virDomainDefParseFile(domain_filename, caps, xmlopt,
- NULL, VIR_DOMAIN_DEF_PARSE_INACTIVE)))
- goto cleanup;
-
if (qemuMonitorTestAddAgentSyncResponse(test) < 0)
goto cleanup;
@@ -220,8 +214,7 @@ testQemuAgentGetFSInfo(const void *data)
" \"disk\": [], \"type\": \"xfs\"}]}") < 0)
goto cleanup;
- if ((ninfo = qemuAgentGetFSInfo(qemuMonitorTestGetAgent(test),
- &info, def)) < 0)
+ if ((ninfo = qemuAgentGetFSInfo(qemuMonitorTestGetAgent(test), &info)) < 0)
goto cleanup;
if (ninfo != 3) {
@@ -234,11 +227,11 @@ testQemuAgentGetFSInfo(const void *data)
STRNEQ(info[2]->mountpoint, "/") ||
STRNEQ(info[2]->fstype, "ext4") ||
info[2]->ndevAlias != 1 ||
- !info[2]->devAlias || !info[2]->devAlias[0] ||
- STRNEQ(info[2]->devAlias[0], "hdc")) {
+ !info[2]->devAlias ||
+ memcmp(&info[2]->devAlias[0], &alias_sda1, sizeof(alias_sda1)) != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
- "unexpected filesystems information returned for sda1 (%s,%s)",
- info[2]->name, info[2]->devAlias ? info[2]->devAlias[0] : "null");
+ "unexpected filesystems information returned for sda1 (%s)",
+ info[2]->name);
ret = -1;
goto cleanup;
}
@@ -246,12 +239,12 @@ testQemuAgentGetFSInfo(const void *data)
STRNEQ(info[1]->mountpoint, "/opt") ||
STRNEQ(info[1]->fstype, "vfat") ||
info[1]->ndevAlias != 2 ||
- !info[1]->devAlias || !info[1]->devAlias[0] || !info[1]->devAlias[1] ||
- STRNEQ(info[1]->devAlias[0], "vda") ||
- STRNEQ(info[1]->devAlias[1], "vdb")) {
+ !info[1]->devAlias ||
+ memcmp(&info[1]->devAlias[0], &alias_vda, sizeof(alias_vda)) != 0 ||
+ memcmp(&info[1]->devAlias[1], &alias_vdb, sizeof(alias_vdb)) != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
- "unexpected filesystems information returned for dm-1 (%s,%s)",
- info[0]->name, info[0]->devAlias ? info[0]->devAlias[0] : "null");
+ "unexpected filesystems information returned for dm-1 (%s)",
+ info[0]->name);
ret = -1;
goto cleanup;
}
@@ -260,8 +253,8 @@ testQemuAgentGetFSInfo(const void *data)
STRNEQ(info[0]->fstype, "xfs") ||
info[0]->ndevAlias != 0 || info[0]->devAlias) {
virReportError(VIR_ERR_INTERNAL_ERROR,
- "unexpected filesystems information returned for sdb1 (%s,%s)",
- info[0]->name, info[0]->devAlias ? info[0]->devAlias[0] : "null");
+ "unexpected filesystems information returned for sdb1 (%s)",
+ info[0]->name);
ret = -1;
goto cleanup;
}
@@ -280,7 +273,7 @@ testQemuAgentGetFSInfo(const void *data)
"}") < 0)
goto cleanup;
- if (qemuAgentGetFSInfo(qemuMonitorTestGetAgent(test), &info, def) != -1) {
+ if (qemuAgentGetFSInfo(qemuMonitorTestGetAgent(test), &info) != -1) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
"agent get-fsinfo command should have failed");
goto cleanup;
@@ -290,11 +283,9 @@ testQemuAgentGetFSInfo(const void *data)
cleanup:
for (i = 0; i < ninfo; i++)
- virDomainFSInfoFree(info[i]);
+ qemuAgentFsInfoFree(info[i]);
VIR_FREE(info);
- VIR_FREE(domain_filename);
virObjectUnref(caps);
- virDomainDefFree(def);
qemuMonitorTestFree(test);
return ret;
}
--
1.8.3.1
More information about the libvir-list
mailing list