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libvirt/9faf3f29-LXC-memtune.patch
James Fehlig 7ea60c0a28 - 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

OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=337
2013-12-20 16:25:32 +00:00

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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;
}
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