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Fix crash in lxcDomainSetMemoryParameters

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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>
(cherry picked from commit 9faf3f2950)

Conflicts:
	src/lxc/lxc_driver.c
This commit is contained in:
Martin Kletzander 2013-12-09 11:15:12 +01:00 committed by Daniel P. Berrange
parent 80d682fd90
commit 2d2bd72dc4
1 changed files with 91 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

126
src/lxc/lxc_driver.c
View File

@ -744,14 +744,22 @@ lxcDomainSetMemoryParameters(virDomainPtr dom,
int nparams,
unsigned int flags)
{
virLXCDriverPtr driver = dom->conn->privateData;
int i;
virDomainDefPtr vmdef = NULL;
virDomainObjPtr vm = NULL;
int ret = -1;
virLXCDomainObjPrivatePtr priv = 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;
virLXCDomainObjPrivatePtr priv;
int ret = -1;
virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
VIR_DOMAIN_AFFECT_CONFIG, -1);
virCheckFlags(0, -1);
if (virTypedParameterArrayValidate(params, nparams,
VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG,
@ -774,34 +782,88 @@ lxcDomainSetMemoryParameters(virDomainPtr dom,
}
priv = vm->privateData;
if (virDomainLiveConfigHelperMethod(driver->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;
}
#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(driver->configDir, vmdef) < 0)
goto cleanup;
ret = 0;
for (i = 0; i < nparams; i++) {
virTypedParameterPtr param = &params[i];
if (STREQ(param->field, VIR_DOMAIN_MEMORY_HARD_LIMIT)) {
rc = virCgroupSetMemoryHardLimit(priv->cgroup, params[i].value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set memory hard_limit tunable"));
ret = -1;
}
} else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SOFT_LIMIT)) {
rc = virCgroupSetMemorySoftLimit(priv->cgroup, params[i].value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set memory soft_limit tunable"));
ret = -1;
}
} else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT)) {
rc = virCgroupSetMemSwapHardLimit(priv->cgroup, params[i].value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set swap_hard_limit tunable"));
ret = -1;
}
}
}
cleanup:
if (vm)
virObjectUnlock(vm);