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- CVE-2013-6436: Fix crashes in lxc memtune code, one of which

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results in DoS
  f8c1cb90-CVE-2013-6436.patch, 9faf3f29-LXC-memtune.patch
  bnc#854486

OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=337
This commit is contained in:
James Fehlig 2013-12-20 16:25:32 +00:00 committed by Git OBS Bridge
parent 387203a948
commit 7ea60c0a28
4 changed files with 356 additions and 0 deletions
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199
9faf3f29-LXC-memtune.patch Normal file
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@ -0,0 +1,199 @@
commit 9faf3f2950aed1643ab7564afcb4c693c77f71b5
Author: Martin Kletzander <mkletzan@redhat.com>
Date: Mon Dec 9 11:15:12 2013 +0100
Fix crash in lxcDomainSetMemoryParameters
The function doesn't check whether the request is made for active or
inactive domain. Thus when the domain is not running it still tries
accessing non-existing cgroups (priv->cgroup, which is NULL).
I re-made the function in order for it to work the same way it's qemu
counterpart does.
Reproducer:
1) Define an LXC domain
2) Do 'virsh memtune <domain> --hard-limit 133T'
Backtrace:
Thread 6 (Thread 0x7fffec8c0700 (LWP 26826)):
#0 0x00007ffff70edcc4 in virCgroupPathOfController (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", path=0x7fffec8bf718) at util/vircgroup.c:1764
#1 0x00007ffff70e9206 in virCgroupSetValueStr (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", value=0x7fffe409f360 "1073741824")
at util/vircgroup.c:669
#2 0x00007ffff70e98b4 in virCgroupSetValueU64 (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", value=1073741824) at util/vircgroup.c:740
#3 0x00007ffff70ee518 in virCgroupSetMemory (group=0x0, kb=1048576) at util/vircgroup.c:1904
#4 0x00007ffff70ee675 in virCgroupSetMemoryHardLimit (group=0x0, kb=1048576)
at util/vircgroup.c:1944
#5 0x00005555557d54c8 in lxcDomainSetMemoryParameters (dom=0x7fffe40cc420,
params=0x7fffe409f100, nparams=1, flags=0) at lxc/lxc_driver.c:774
#6 0x00007ffff72c20f9 in virDomainSetMemoryParameters (domain=0x7fffe40cc420,
params=0x7fffe409f100, nparams=1, flags=0) at libvirt.c:4051
#7 0x000055555561365f in remoteDispatchDomainSetMemoryParameters (server=0x555555eb7e00,
client=0x555555ec4b10, msg=0x555555eb94e0, rerr=0x7fffec8bfb70, args=0x7fffe40b8510)
at remote_dispatch.h:7621
#8 0x00005555556133fd in remoteDispatchDomainSetMemoryParametersHelper (server=0x555555eb7e00,
client=0x555555ec4b10, msg=0x555555eb94e0, rerr=0x7fffec8bfb70, args=0x7fffe40b8510,
ret=0x7fffe40b84f0) at remote_dispatch.h:7591
#9 0x00007ffff73b293f in virNetServerProgramDispatchCall (prog=0x555555ec3ae0,
server=0x555555eb7e00, client=0x555555ec4b10, msg=0x555555eb94e0)
at rpc/virnetserverprogram.c:435
#10 0x00007ffff73b207f in virNetServerProgramDispatch (prog=0x555555ec3ae0,
server=0x555555eb7e00, client=0x555555ec4b10, msg=0x555555eb94e0)
at rpc/virnetserverprogram.c:305
#11 0x00007ffff73a4d2c in virNetServerProcessMsg (srv=0x555555eb7e00, client=0x555555ec4b10,
prog=0x555555ec3ae0, msg=0x555555eb94e0) at rpc/virnetserver.c:165
#12 0x00007ffff73a4e8d in virNetServerHandleJob (jobOpaque=0x555555ec3e30, opaque=0x555555eb7e00)
at rpc/virnetserver.c:186
#13 0x00007ffff7187f3f in virThreadPoolWorker (opaque=0x555555eb7ac0) at util/virthreadpool.c:144
#14 0x00007ffff718733a in virThreadHelper (data=0x555555eb7890) at util/virthreadpthread.c:161
#15 0x00007ffff468ed89 in start_thread (arg=0x7fffec8c0700) at pthread_create.c:308
#16 0x00007ffff3da26bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Index: libvirt-1.2.0/src/lxc/lxc_driver.c
===================================================================
--- libvirt-1.2.0.orig/src/lxc/lxc_driver.c
+++ libvirt-1.2.0/src/lxc/lxc_driver.c
@@ -742,12 +742,24 @@ lxcDomainSetMemoryParameters(virDomainPt
int nparams,
unsigned int flags)
{
- size_t i;
+ virCapsPtr caps = NULL;
+ virDomainDefPtr vmdef = NULL;
virDomainObjPtr vm = NULL;
+ virLXCDomainObjPrivatePtr priv = NULL;
+ virLXCDriverConfigPtr cfg = NULL;
+ virLXCDriverPtr driver = dom->conn->privateData;
+ unsigned long long hard_limit;
+ unsigned long long soft_limit;
+ unsigned long long swap_hard_limit;
+ bool set_hard_limit = false;
+ bool set_soft_limit = false;
+ bool set_swap_hard_limit = false;
+ int rc;
int ret = -1;
- virLXCDomainObjPrivatePtr priv;
- virCheckFlags(0, -1);
+ virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
+ VIR_DOMAIN_AFFECT_CONFIG, -1);
+
if (virTypedParamsValidate(params, nparams,
VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG,
@@ -762,29 +774,97 @@ lxcDomainSetMemoryParameters(virDomainPt
goto cleanup;
priv = vm->privateData;
+ cfg = virLXCDriverGetConfig(driver);
- if (virDomainSetMemoryParametersEnsureACL(dom->conn, vm->def, flags) < 0)
+ if (virDomainSetMemoryParametersEnsureACL(dom->conn, vm->def, flags) < 0 ||
+ !(caps = virLXCDriverGetCapabilities(driver, false)) ||
+ virDomainLiveConfigHelperMethod(caps, driver->xmlopt,
+ vm, &flags, &vmdef) < 0)
goto cleanup;
- ret = 0;
- for (i = 0; i < nparams; i++) {
- virTypedParameterPtr param = &params[i];
+ if (flags & VIR_DOMAIN_AFFECT_LIVE &&
+ !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_MEMORY)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("cgroup memory controller is not mounted"));
+ goto cleanup;
+ }
- if (STREQ(param->field, VIR_DOMAIN_MEMORY_HARD_LIMIT)) {
- if (virCgroupSetMemoryHardLimit(priv->cgroup, params[i].value.ul) < 0)
- ret = -1;
- } else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SOFT_LIMIT)) {
- if (virCgroupSetMemorySoftLimit(priv->cgroup, params[i].value.ul) < 0)
- ret = -1;
- } else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT)) {
- if (virCgroupSetMemSwapHardLimit(priv->cgroup, params[i].value.ul) < 0)
- ret = -1;
+#define VIR_GET_LIMIT_PARAMETER(PARAM, VALUE) \
+ if ((rc = virTypedParamsGetULLong(params, nparams, PARAM, &VALUE)) < 0) \
+ goto cleanup; \
+ \
+ if (rc == 1) \
+ set_ ## VALUE = true;
+
+ VIR_GET_LIMIT_PARAMETER(VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT, swap_hard_limit)
+ VIR_GET_LIMIT_PARAMETER(VIR_DOMAIN_MEMORY_HARD_LIMIT, hard_limit)
+ VIR_GET_LIMIT_PARAMETER(VIR_DOMAIN_MEMORY_SOFT_LIMIT, soft_limit)
+
+#undef VIR_GET_LIMIT_PARAMETER
+
+ /* Swap hard limit must be greater than hard limit.
+ * Note that limit of 0 denotes unlimited */
+ if (set_swap_hard_limit || set_hard_limit) {
+ unsigned long long mem_limit = vm->def->mem.hard_limit;
+ unsigned long long swap_limit = vm->def->mem.swap_hard_limit;
+
+ if (set_swap_hard_limit)
+ swap_limit = swap_hard_limit;
+
+ if (set_hard_limit)
+ mem_limit = hard_limit;
+
+ if (virCompareLimitUlong(mem_limit, swap_limit) > 0) {
+ virReportError(VIR_ERR_INVALID_ARG, "%s",
+ _("memory hard_limit tunable value must be lower "
+ "than or equal to swap_hard_limit"));
+ goto cleanup;
}
}
+#define LXC_SET_MEM_PARAMETER(FUNC, VALUE) \
+ if (set_ ## VALUE) { \
+ if (flags & VIR_DOMAIN_AFFECT_LIVE) { \
+ if ((rc = FUNC(priv->cgroup, VALUE)) < 0) { \
+ virReportSystemError(-rc, _("unable to set memory %s tunable"), \
+ #VALUE); \
+ \
+ goto cleanup; \
+ } \
+ vm->def->mem.VALUE = VALUE; \
+ } \
+ \
+ if (flags & VIR_DOMAIN_AFFECT_CONFIG) \
+ vmdef->mem.VALUE = VALUE; \
+ }
+
+ /* Soft limit doesn't clash with the others */
+ LXC_SET_MEM_PARAMETER(virCgroupSetMemorySoftLimit, soft_limit);
+
+ /* set hard limit before swap hard limit if decreasing it */
+ if (virCompareLimitUlong(vm->def->mem.hard_limit, hard_limit) > 0) {
+ LXC_SET_MEM_PARAMETER(virCgroupSetMemoryHardLimit, hard_limit);
+ /* inhibit changing the limit a second time */
+ set_hard_limit = false;
+ }
+
+ LXC_SET_MEM_PARAMETER(virCgroupSetMemSwapHardLimit, swap_hard_limit);
+
+ /* otherwise increase it after swap hard limit */
+ LXC_SET_MEM_PARAMETER(virCgroupSetMemoryHardLimit, hard_limit);
+
+#undef LXC_SET_MEM_PARAMETER
+
+ if (flags & VIR_DOMAIN_AFFECT_CONFIG &&
+ virDomainSaveConfig(cfg->configDir, vmdef) < 0)
+ goto cleanup;
+
+ ret = 0;
cleanup:
if (vm)
virObjectUnlock(vm);
+ virObjectUnref(caps);
+ virObjectUnref(cfg);
return ret;
}

145
f8c1cb90-CVE-2013-6436.patch Normal file
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@ -0,0 +1,145 @@
commit f8c1cb90213508c4f32549023b0572ed774e48aa
Author: Martin Kletzander <mkletzan@redhat.com>
Date: Mon Dec 9 11:15:11 2013 +0100
CVE-2013-6436: fix crash in lxcDomainGetMemoryParameters
The function doesn't check whether the request is made for active or
inactive domain. Thus when the domain is not running it still tries
accessing non-existing cgroups (priv->cgroup, which is NULL).
I re-made the function in order for it to work the same way it's qemu
counterpart does.
Reproducer:
1) Define an LXC domain
2) Do 'virsh memtune <domain>'
Backtrace:
Thread 6 (Thread 0x7fffec8c0700 (LWP 13387)):
#0 0x00007ffff70edcc4 in virCgroupPathOfController (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", path=0x7fffec8bf750) at util/vircgroup.c:1764
#1 0x00007ffff70e958c in virCgroupGetValueStr (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", value=0x7fffec8bf7c0) at util/vircgroup.c:705
#2 0x00007ffff70e9d29 in virCgroupGetValueU64 (group=0x0, controller=3,
key=0x7ffff75734bd "memory.limit_in_bytes", value=0x7fffec8bf810) at util/vircgroup.c:804
#3 0x00007ffff70ee706 in virCgroupGetMemoryHardLimit (group=0x0, kb=0x7fffec8bf8a8)
at util/vircgroup.c:1962
#4 0x00005555557d590f in lxcDomainGetMemoryParameters (dom=0x7fffd40024a0,
params=0x7fffd40027a0, nparams=0x7fffec8bfa24, flags=0) at lxc/lxc_driver.c:826
#5 0x00007ffff72c28d3 in virDomainGetMemoryParameters (domain=0x7fffd40024a0,
params=0x7fffd40027a0, nparams=0x7fffec8bfa24, flags=0) at libvirt.c:4137
#6 0x000055555563714d in remoteDispatchDomainGetMemoryParameters (server=0x555555eb7e00,
client=0x555555ebaef0, msg=0x555555ebb3e0, rerr=0x7fffec8bfb70, args=0x7fffd40024e0,
ret=0x7fffd4002420) at remote.c:1895
#7 0x00005555556052c4 in remoteDispatchDomainGetMemoryParametersHelper (server=0x555555eb7e00,
client=0x555555ebaef0, msg=0x555555ebb3e0, rerr=0x7fffec8bfb70, args=0x7fffd40024e0,
ret=0x7fffd4002420) at remote_dispatch.h:4050
#8 0x00007ffff73b293f in virNetServerProgramDispatchCall (prog=0x555555ec3ae0,
server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0)
at rpc/virnetserverprogram.c:435
#9 0x00007ffff73b207f in virNetServerProgramDispatch (prog=0x555555ec3ae0,
server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0)
at rpc/virnetserverprogram.c:305
#10 0x00007ffff73a4d2c in virNetServerProcessMsg (srv=0x555555eb7e00, client=0x555555ebaef0,
prog=0x555555ec3ae0, msg=0x555555ebb3e0) at rpc/virnetserver.c:165
#11 0x00007ffff73a4e8d in virNetServerHandleJob (jobOpaque=0x555555ebc7e0, opaque=0x555555eb7e00)
at rpc/virnetserver.c:186
#12 0x00007ffff7187f3f in virThreadPoolWorker (opaque=0x555555eb7ac0) at util/virthreadpool.c:144
#13 0x00007ffff718733a in virThreadHelper (data=0x555555eb7890) at util/virthreadpthread.c:161
#14 0x00007ffff468ed89 in start_thread (arg=0x7fffec8c0700) at pthread_create.c:308
#15 0x00007ffff3da26bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Index: libvirt-1.2.0/src/lxc/lxc_driver.c
===================================================================
--- libvirt-1.2.0.orig/src/lxc/lxc_driver.c
+++ libvirt-1.2.0/src/lxc/lxc_driver.c
@@ -794,22 +794,36 @@ lxcDomainGetMemoryParameters(virDomainPt
int *nparams,
unsigned int flags)
{
- size_t i;
+ virCapsPtr caps = NULL;
+ virDomainDefPtr vmdef = NULL;
virDomainObjPtr vm = NULL;
+ virLXCDomainObjPrivatePtr priv = NULL;
+ virLXCDriverPtr driver = dom->conn->privateData;
unsigned long long val;
int ret = -1;
- virLXCDomainObjPrivatePtr priv;
+ size_t i;
- virCheckFlags(0, -1);
+ virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
+ VIR_DOMAIN_AFFECT_CONFIG, -1);
if (!(vm = lxcDomObjFromDomain(dom)))
goto cleanup;
priv = vm->privateData;
- if (virDomainGetMemoryParametersEnsureACL(dom->conn, vm->def) < 0)
+ if (virDomainGetMemoryParametersEnsureACL(dom->conn, vm->def) < 0 ||
+ !(caps = virLXCDriverGetCapabilities(driver, false)) ||
+ virDomainLiveConfigHelperMethod(caps, driver->xmlopt,
+ vm, &flags, &vmdef) < 0)
goto cleanup;
+ if (flags & VIR_DOMAIN_AFFECT_LIVE &&
+ !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_MEMORY)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("cgroup memory controller is not mounted"));
+ goto cleanup;
+ }
+
if ((*nparams) == 0) {
/* Current number of memory parameters supported by cgroups */
*nparams = LXC_NB_MEM_PARAM;
@@ -823,22 +837,34 @@ lxcDomainGetMemoryParameters(virDomainPt
switch (i) {
case 0: /* fill memory hard limit here */
- if (virCgroupGetMemoryHardLimit(priv->cgroup, &val) < 0)
+ if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
+ val = vmdef->mem.hard_limit;
+ val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ } else if (virCgroupGetMemoryHardLimit(priv->cgroup, &val) < 0) {
goto cleanup;
+ }
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG, val) < 0)
goto cleanup;
break;
case 1: /* fill memory soft limit here */
- if (virCgroupGetMemorySoftLimit(priv->cgroup, &val) < 0)
+ if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
+ val = vmdef->mem.soft_limit;
+ val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ } else if (virCgroupGetMemorySoftLimit(priv->cgroup, &val) < 0) {
goto cleanup;
+ }
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_SOFT_LIMIT,
VIR_TYPED_PARAM_ULLONG, val) < 0)
goto cleanup;
break;
case 2: /* fill swap hard limit here */
- if (virCgroupGetMemSwapHardLimit(priv->cgroup, &val) < 0)
+ if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
+ val = vmdef->mem.swap_hard_limit;
+ val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ } else if (virCgroupGetMemSwapHardLimit(priv->cgroup, &val) < 0) {
goto cleanup;
+ }
if (virTypedParameterAssign(param,
VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG, val) < 0)
@@ -859,6 +885,7 @@ lxcDomainGetMemoryParameters(virDomainPt
cleanup:
if (vm)
virObjectUnlock(vm);
+ virObjectUnref(caps);
return ret;
}

8
libvirt.changes
View File

@ -1,3 +1,11 @@
-------------------------------------------------------------------
Fri Dec 20 09:04:45 MST 2013 - jfehlig@suse.com
- CVE-2013-6436: Fix crashes in lxc memtune code, one of which
results in DoS
f8c1cb90-CVE-2013-6436.patch, 9faf3f29-LXC-memtune.patch
bnc#854486
-------------------------------------------------------------------
Fri Dec 6 15:49:34 MST 2013 - jfehlig@suse.com

4
libvirt.spec
View File

@ -418,6 +418,8 @@ Source1: libvirtd.init
Source2: libvirtd-relocation-server.fw
Source99: baselibs.conf
# Upstream patches
Patch0: f8c1cb90-CVE-2013-6436.patch
Patch1: 9faf3f29-LXC-memtune.patch
# Need to go upstream
Patch100: xen-name-for-devid.patch
Patch101: ia64-clone.patch
@ -917,6 +919,8 @@ namespaces.
%prep
%setup -q
%patch0 -p1
%patch1 -p1
%patch100 -p1
%patch101 -p1
%patch102 -p1