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libvirt/CVE-2010-223x-0008.patch

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>From e7db25186de8cb278f2b5f5c51e965129defaa11 Mon Sep 17 00:00:00 2001
From: Daniel P. Berrange <berrange@redhat.com>
Date: Tue, 15 Jun 2010 17:58:58 +0100
Subject: [PATCH 08/10] Disable all disk probing in QEMU driver & add config option to re-enable
Disk format probing is now disabled by default. A new config
option in /etc/qemu/qemu.conf will re-enable it for existing
deployments where this causes trouble
---
src/qemu/libvirtd_qemu.aug | 1 +
src/qemu/qemu.conf | 12 ++++++++++++
src/qemu/qemu_conf.c | 4 ++++
src/qemu/qemu_conf.h | 1 +
src/qemu/qemu_driver.c | 36 +++++++++++++++++++++++-------------
src/qemu/qemu_security_dac.c | 2 +-
src/qemu/test_libvirtd_qemu.aug | 4 ++++
src/security/security_apparmor.c | 12 ++++++++----
src/security/security_driver.c | 16 ++++++++++++++--
src/security/security_driver.h | 10 ++++++++--
src/security/security_selinux.c | 9 ++++++---
src/security/virt-aa-helper.c | 10 +++++++++-
tests/seclabeltest.c | 2 +-
13 files changed, 92 insertions(+), 27 deletions(-)
Index: libvirt-0.8.1/src/qemu/libvirtd_qemu.aug
===================================================================
--- libvirt-0.8.1.orig/src/qemu/libvirtd_qemu.aug
+++ libvirt-0.8.1/src/qemu/libvirtd_qemu.aug
@@ -38,6 +38,7 @@ module Libvirtd_qemu =
| str_entry "save_image_format"
| str_entry "hugetlbfs_mount"
| bool_entry "relaxed_acs_check"
+ | bool_entry "allow_disk_format_probing"
(* Each enty in the config is one of the following three ... *)
let entry = vnc_entry
Index: libvirt-0.8.1/src/qemu/qemu.conf
===================================================================
--- libvirt-0.8.1.orig/src/qemu/qemu.conf
+++ libvirt-0.8.1/src/qemu/qemu.conf
@@ -168,3 +168,15 @@
# be assigned to guests.
#
# relaxed_acs_check = 1
+
+
+
+# If allow_disk_format_probing is enabled, libvirt will probe disk
+# images to attempt to identify their format, when not otherwise
+# specified in the XML. This is disabled by default.
+#
+# WARNING: Enabling probing is a security hole in almost all
+# deployments. It is strongly recommended that users update their
+# guest XML <disk> elements to include <driver type='XXXX'/>
+# elements instead of enabling this option.
+# allow_disk_format_probing = 1
Index: libvirt-0.8.1/src/qemu/qemu_conf.c
===================================================================
--- libvirt-0.8.1.orig/src/qemu/qemu_conf.c
+++ libvirt-0.8.1/src/qemu/qemu_conf.c
@@ -351,6 +351,10 @@ int qemudLoadDriverConfig(struct qemud_d
CHECK_TYPE ("relaxed_acs_check", VIR_CONF_LONG);
if (p) driver->relaxedACS = p->l;
+ p = virConfGetValue (conf, "allow_disk_format_probing");
+ CHECK_TYPE ("allow_disk_format_probing", VIR_CONF_LONG);
+ if (p) driver->allowDiskFormatProbing = p->l;
+
virConfFree (conf);
return 0;
}
Index: libvirt-0.8.1/src/qemu/qemu_driver.c
===================================================================
--- libvirt-0.8.1.orig/src/qemu/qemu_driver.c
+++ libvirt-0.8.1/src/qemu/qemu_driver.c
@@ -1289,7 +1289,8 @@ qemudSecurityInit(struct qemud_driver *q
qemuSecurityDACSetDriver(qemud_drv);
ret = virSecurityDriverStartup(&security_drv,
- qemud_drv->securityDriverName);
+ qemud_drv->securityDriverName,
+ qemud_drv->allowDiskFormatProbing);
if (ret == -1) {
VIR_ERROR0(_("Failed to start security driver"));
return -1;
@@ -9145,8 +9146,15 @@ static int qemuDomainGetBlockInfo(virDom
goto cleanup;
}
} else {
- if ((format = virStorageFileProbeFormat(disk->src)) < 0)
+ if (driver->allowDiskFormatProbing) {
+ if ((format = virStorageFileProbeFormat(disk->src)) < 0)
+ goto cleanup;
+ } else {
+ qemuReportError(VIR_ERR_INTERNAL_ERROR,
+ _("no disk format for %s and probing is disabled"),
+ disk->src);
goto cleanup;
+ }
}
if (virStorageFileGetMetadataFromFD(path, fd,
Index: libvirt-0.8.1/src/qemu/qemu_security_dac.c
===================================================================
--- libvirt-0.8.1.orig/src/qemu/qemu_security_dac.c
+++ libvirt-0.8.1/src/qemu/qemu_security_dac.c
@@ -118,7 +118,7 @@ qemuSecurityDACSetSecurityImageLabel(vir
return 0;
return virDomainDiskDefForeachPath(disk,
- true,
+ driver->allowDiskFormatProbing,
false,
qemuSecurityDACSetSecurityFileLabel,
NULL);
Index: libvirt-0.8.1/src/qemu/test_libvirtd_qemu.aug
===================================================================
--- libvirt-0.8.1.orig/src/qemu/test_libvirtd_qemu.aug
+++ libvirt-0.8.1/src/qemu/test_libvirtd_qemu.aug
@@ -97,6 +97,8 @@ save_image_format = \"gzip\"
hugetlbfs_mount = \"/dev/hugepages\"
relaxed_acs_check = 1
+
+allow_disk_format_probing = 1
"
test Libvirtd_qemu.lns get conf =
@@ -204,3 +206,5 @@ relaxed_acs_check = 1
{ "hugetlbfs_mount" = "/dev/hugepages" }
{ "#empty" }
{ "relaxed_acs_check" = "1" }
+{ "#empty" }
+{ "allow_disk_format_probing" = "1" }
Index: libvirt-0.8.1/src/security/security_apparmor.c
===================================================================
--- libvirt-0.8.1.orig/src/security/security_apparmor.c
+++ libvirt-0.8.1/src/security/security_apparmor.c
@@ -157,6 +157,8 @@ load_profile(virSecurityDriverPtr drv,
char *xml = NULL;
int pipefd[2];
pid_t child;
+ const char *probe = virSecurityDriverGetAllowDiskFormatProbing(drv)
+ ? "1" : "0";
if (pipe(pipefd) < -1) {
virReportSystemError(errno, "%s", _("unable to create pipe"));
@@ -172,19 +174,19 @@ load_profile(virSecurityDriverPtr drv,
if (create) {
const char *const argv[] = {
- VIRT_AA_HELPER, "-c", "-u", profile, NULL
+ VIRT_AA_HELPER, "-p", probe, "-c", "-u", profile, NULL
};
ret = virExec(argv, NULL, NULL, &child,
pipefd[0], NULL, NULL, VIR_EXEC_NONE);
} else if (disk && disk->src) {
const char *const argv[] = {
- VIRT_AA_HELPER, "-r", "-u", profile, "-f", disk->src, NULL
+ VIRT_AA_HELPER, "-p", probe, "-r", "-u", profile, "-f", disk->src, NULL
};
ret = virExec(argv, NULL, NULL, &child,
pipefd[0], NULL, NULL, VIR_EXEC_NONE);
} else {
const char *const argv[] = {
- VIRT_AA_HELPER, "-r", "-u", profile, NULL
+ VIRT_AA_HELPER, "-p", probe, "-r", "-u", profile, NULL
};
ret = virExec(argv, NULL, NULL, &child,
pipefd[0], NULL, NULL, VIR_EXEC_NONE);
@@ -312,9 +314,11 @@ AppArmorSecurityDriverProbe(void)
* currently not used.
*/
static int
-AppArmorSecurityDriverOpen(virSecurityDriverPtr drv)
+AppArmorSecurityDriverOpen(virSecurityDriverPtr drv,
+ bool allowDiskFormatProbing)
{
virSecurityDriverSetDOI(drv, SECURITY_APPARMOR_VOID_DOI);
+ virSecurityDriverSetAllowDiskFormatProbing(drv, allowDiskFormatProbing);
return 0;
}
Index: libvirt-0.8.1/src/security/security_driver.c
===================================================================
--- libvirt-0.8.1.orig/src/security/security_driver.c
+++ libvirt-0.8.1/src/security/security_driver.c
@@ -56,7 +56,8 @@ virSecurityDriverVerify(virDomainDefPtr
int
virSecurityDriverStartup(virSecurityDriverPtr *drv,
- const char *name)
+ const char *name,
+ bool allowDiskFormatProbing)
{
unsigned int i;
@@ -72,7 +73,7 @@ virSecurityDriverStartup(virSecurityDriv
switch (tmp->probe()) {
case SECURITY_DRIVER_ENABLE:
virSecurityDriverInit(tmp);
- if (tmp->open(tmp) == -1) {
+ if (tmp->open(tmp, allowDiskFormatProbing) == -1) {
return -1;
} else {
*drv = tmp;
@@ -125,3 +126,14 @@ virSecurityDriverGetModel(virSecurityDri
{
return drv->name;
}
+
+void virSecurityDriverSetAllowDiskFormatProbing(virSecurityDriverPtr drv,
+ bool allowDiskFormatProbing)
+{
+ drv->_private.allowDiskFormatProbing = allowDiskFormatProbing;
+}
+
+bool virSecurityDriverGetAllowDiskFormatProbing(virSecurityDriverPtr drv)
+{
+ return drv->_private.allowDiskFormatProbing;
+}
Index: libvirt-0.8.1/src/security/security_driver.h
===================================================================
--- libvirt-0.8.1.orig/src/security/security_driver.h
+++ libvirt-0.8.1/src/security/security_driver.h
@@ -33,7 +33,8 @@ typedef struct _virSecurityDriverState v
typedef virSecurityDriverState *virSecurityDriverStatePtr;
typedef virSecurityDriverStatus (*virSecurityDriverProbe) (void);
-typedef int (*virSecurityDriverOpen) (virSecurityDriverPtr drv);
+typedef int (*virSecurityDriverOpen) (virSecurityDriverPtr drv,
+ bool allowDiskFormatProbing);
typedef int (*virSecurityDomainRestoreImageLabel) (virSecurityDriverPtr drv,
virDomainObjPtr vm,
virDomainDiskDefPtr disk);
@@ -94,12 +95,14 @@ struct _virSecurityDriver {
*/
struct {
char doi[VIR_SECURITY_DOI_BUFLEN];
+ bool allowDiskFormatProbing;
} _private;
};
/* Global methods */
int virSecurityDriverStartup(virSecurityDriverPtr *drv,
- const char *name);
+ const char *name,
+ bool allowDiskFormatProbing);
int
virSecurityDriverVerify(virDomainDefPtr def);
@@ -112,7 +115,10 @@ virSecurityDriverVerify(virDomainDefPtr
void virSecurityDriverInit(virSecurityDriverPtr drv);
int virSecurityDriverSetDOI(virSecurityDriverPtr drv,
const char *doi);
+void virSecurityDriverSetAllowDiskFormatProbing(virSecurityDriverPtr drv,
+ bool allowDiskFormatProbing);
const char *virSecurityDriverGetDOI(virSecurityDriverPtr drv);
const char *virSecurityDriverGetModel(virSecurityDriverPtr drv);
+bool virSecurityDriverGetAllowDiskFormatProbing(virSecurityDriverPtr drv);
#endif /* __VIR_SECURITY_H__ */
Index: libvirt-0.8.1/src/security/security_selinux.c
===================================================================
--- libvirt-0.8.1.orig/src/security/security_selinux.c
+++ libvirt-0.8.1/src/security/security_selinux.c
@@ -266,13 +266,15 @@ SELinuxSecurityDriverProbe(void)
}
static int
-SELinuxSecurityDriverOpen(virSecurityDriverPtr drv)
+SELinuxSecurityDriverOpen(virSecurityDriverPtr drv,
+ bool allowDiskFormatProbing)
{
/*
* Where will the DOI come from? SELinux configuration, or qemu
* configuration? For the moment, we'll just set it to "0".
*/
virSecurityDriverSetDOI(drv, SECURITY_SELINUX_VOID_DOI);
+ virSecurityDriverSetAllowDiskFormatProbing(drv, allowDiskFormatProbing);
return SELinuxInitialize();
}
@@ -438,18 +440,19 @@ SELinuxSetSecurityFileLabel(virDomainDis
}
static int
-SELinuxSetSecurityImageLabel(virSecurityDriverPtr drv ATTRIBUTE_UNUSED,
+SELinuxSetSecurityImageLabel(virSecurityDriverPtr drv,
virDomainObjPtr vm,
virDomainDiskDefPtr disk)
{
const virSecurityLabelDefPtr secdef = &vm->def->seclabel;
+ bool allowDiskFormatProbing = virSecurityDriverGetAllowDiskFormatProbing(drv);
if (secdef->type == VIR_DOMAIN_SECLABEL_STATIC)
return 0;
return virDomainDiskDefForeachPath(disk,
- true,
+ allowDiskFormatProbing,
false,
SELinuxSetSecurityFileLabel,
secdef);
Index: libvirt-0.8.1/src/security/virt-aa-helper.c
===================================================================
--- libvirt-0.8.1.orig/src/security/virt-aa-helper.c
+++ libvirt-0.8.1/src/security/virt-aa-helper.c
@@ -40,6 +40,7 @@
static char *progname;
typedef struct {
+ bool allowDiskFormatProbing;
char uuid[PROFILE_NAME_SIZE]; /* UUID of vm */
bool dryrun; /* dry run */
char cmd; /* 'c' create
@@ -845,7 +846,7 @@ get_files(vahControl * ctl)
for (i = 0; i < ctl->def->ndisks; i++) {
int ret = virDomainDiskDefForeachPath(ctl->def->disks[i],
- true,
+ ctl->allowDiskFormatProbing,
false,
add_file_path,
&buf);
@@ -944,6 +945,7 @@ vahParseArgv(vahControl * ctl, int argc,
{
int arg, idx = 0;
struct option opt[] = {
+ {"probing", 1, 0, 'p' },
{"add", 0, 0, 'a'},
{"create", 0, 0, 'c'},
{"dryrun", 0, 0, 'd'},
@@ -992,6 +994,12 @@ vahParseArgv(vahControl * ctl, int argc,
PROFILE_NAME_SIZE) == NULL)
vah_error(ctl, 1, "error copying UUID");
break;
+ case 'p':
+ if (STREQ(optarg, "1"))
+ ctl->allowDiskFormatProbing = true;
+ else
+ ctl->allowDiskFormatProbing = false;
+ break;
default:
vah_error(ctl, 1, "unsupported option");
break;
Index: libvirt-0.8.1/tests/seclabeltest.c
===================================================================
--- libvirt-0.8.1.orig/tests/seclabeltest.c
+++ libvirt-0.8.1/tests/seclabeltest.c
@@ -15,7 +15,7 @@ main (int argc ATTRIBUTE_UNUSED, char **
const char *doi, *model;
virSecurityDriverPtr security_drv;
- ret = virSecurityDriverStartup (&security_drv, "selinux");
+ ret = virSecurityDriverStartup (&security_drv, "selinux", false);
if (ret == -1)
{
fprintf (stderr, "Failed to start security driver");
Index: libvirt-0.8.1/src/qemu/qemu_conf.h
===================================================================
--- libvirt-0.8.1.orig/src/qemu/qemu_conf.h
+++ libvirt-0.8.1/src/qemu/qemu_conf.h
@@ -137,6 +137,7 @@ struct qemud_driver {
ebtablesContext *ebtables;
unsigned int relaxedACS : 1;
+ unsigned int allowDiskFormatProbing : 1;
virCapsPtr caps;
Index: libvirt-0.8.1/tests/secaatest.c
===================================================================
--- libvirt-0.8.1.orig/tests/secaatest.c
+++ libvirt-0.8.1/tests/secaatest.c
@@ -15,7 +15,7 @@ main (int argc ATTRIBUTE_UNUSED, char **
const char *doi, *model;
virSecurityDriverPtr security_drv;
- ret = virSecurityDriverStartup (&security_drv, "apparmor");
+ ret = virSecurityDriverStartup (&security_drv, "apparmor", false);
if (ret == -1)
{
fprintf (stderr, "Failed to start security driver");
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