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Fixed buffer overflow in populating CPU<->VCPU mapping. Cleanup whitespace

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This commit is contained in:
Daniel P. Berrange 2006-09-28 19:20:52 +00:00
parent 2cb26d70d6
commit 01ae3678f1
2 changed files with 53 additions and 40 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
Thu Sep 21 10:19:02 EDT 2006 Daniel Berrange <berrange@redhat.com>
* src/xend_internal.c: Check if the physical CPU will fit in the maplen
provided by the caller when populating VCPU<->CPU mapping. This is because
XenD will return data for 32 physical CPUs, even if the box only has 4
CPUs. The caller of course will only have allocated a map big enough for
the actual number of physical CPUs. We simply check against maplen param
supplied by caller & discard info about CPUs which don't fit. Also santise
whitespace.
Fri Sep 22 11:02:48 CEST 2006 Daniel Veillard <veillard@redhat.com>
* docs/* libvirt.spec.in configure.in NEWS: preparing release of 0.1.6

83
src/xend_internal.c
View File

@ -2653,7 +2653,7 @@ xenDaemonDomainPinVcpu(virDomainPtr domain, unsigned int vcpu,
*/
int
xenDaemonDomainGetVcpus(virDomainPtr domain, virVcpuInfoPtr info, int maxinfo,
unsigned char *cpumaps, int maplen)
unsigned char *cpumaps, int maplen)
{
struct sexpr *root, *s, *t;
virVcpuInfoPtr ipt = info;
@ -2662,14 +2662,14 @@ xenDaemonDomainGetVcpus(virDomainPtr domain, virVcpuInfoPtr info, int maxinfo,
int vcpu, cpu;
if ((domain == NULL) || (domain->conn == NULL) || (domain->name == NULL)
|| (info == NULL) || (maxinfo < 1)) {
|| (info == NULL) || (maxinfo < 1)) {
virXendError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
__FUNCTION__);
return (-1);
}
if (cpumaps != NULL && maplen < 1) {
virXendError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
__FUNCTION__);
return (-1);
}
root = sexpr_get(domain->conn, "/xend/domain/%s?op=vcpuinfo", domain->name);
@ -2677,46 +2677,49 @@ xenDaemonDomainGetVcpus(virDomainPtr domain, virVcpuInfoPtr info, int maxinfo,
return (-1);
if (cpumaps != NULL)
memset(cpumaps, 0, maxinfo * maplen);
memset(cpumaps, 0, maxinfo * maplen);
/* scan the sexprs from "(vcpu (number x)...)" and get parameter values */
for (s = root; s->kind == SEXPR_CONS; s = s->cdr)
if ((s->car->kind == SEXPR_CONS) &&
(s->car->car->kind == SEXPR_VALUE) &&
!strcmp(s->car->car->value, "vcpu")) {
t = s->car;
vcpu = ipt->number = sexpr_int(t, "vcpu/number");
if ((oln = sexpr_int(t, "vcpu/online")) != 0) {
if (sexpr_int(t, "vcpu/running")) ipt->state = VIR_VCPU_RUNNING;
if (sexpr_int(t, "vcpu/blocked")) ipt->state = VIR_VCPU_BLOCKED;
}
else ipt->state = VIR_VCPU_OFFLINE;
ipt->cpuTime = sexpr_float(t, "vcpu/cpu_time") * 1000000000;
ipt->cpu = oln ? sexpr_int(t, "vcpu/cpu") : -1;
if (cpumaps != NULL && vcpu >= 0 && vcpu < maxinfo) {
cpumap = (unsigned char *) VIR_GET_CPUMAP(cpumaps, maplen, vcpu);
/*
* get sexpr from "(cpumap (x y z...))" and convert values
* to bitmap
*/
for (t = t->cdr; t->kind == SEXPR_CONS; t = t->cdr)
if ((t->car->kind == SEXPR_CONS) &&
(t->car->car->kind == SEXPR_VALUE) &&
!strcmp(t->car->car->value, "cpumap") &&
(t->car->cdr->kind == SEXPR_CONS)) {
for (t = t->car->cdr->car; t->kind == SEXPR_CONS; t = t->cdr)
if (t->car->kind == SEXPR_VALUE) {
cpu = strtol(t->car->value, NULL, 0);
if (cpu >= 0)
VIR_USE_CPU(cpumap, cpu);
}
break;
for (s = root; s->kind == SEXPR_CONS; s = s->cdr) {
if ((s->car->kind == SEXPR_CONS) &&
(s->car->car->kind == SEXPR_VALUE) &&
!strcmp(s->car->car->value, "vcpu")) {
t = s->car;
vcpu = ipt->number = sexpr_int(t, "vcpu/number");
if ((oln = sexpr_int(t, "vcpu/online")) != 0) {
if (sexpr_int(t, "vcpu/running")) ipt->state = VIR_VCPU_RUNNING;
if (sexpr_int(t, "vcpu/blocked")) ipt->state = VIR_VCPU_BLOCKED;
}
}
else
ipt->state = VIR_VCPU_OFFLINE;
ipt->cpuTime = sexpr_float(t, "vcpu/cpu_time") * 1000000000;
ipt->cpu = oln ? sexpr_int(t, "vcpu/cpu") : -1;
if (++nbinfo == maxinfo) break;
ipt++;
if (cpumaps != NULL && vcpu >= 0 && vcpu < maxinfo) {
cpumap = (unsigned char *) VIR_GET_CPUMAP(cpumaps, maplen, vcpu);
/*
* get sexpr from "(cpumap (x y z...))" and convert values
* to bitmap
*/
for (t = t->cdr; t->kind == SEXPR_CONS; t = t->cdr)
if ((t->car->kind == SEXPR_CONS) &&
(t->car->car->kind == SEXPR_VALUE) &&
!strcmp(t->car->car->value, "cpumap") &&
(t->car->cdr->kind == SEXPR_CONS)) {
for (t = t->car->cdr->car; t->kind == SEXPR_CONS; t = t->cdr)
if (t->car->kind == SEXPR_VALUE) {
cpu = strtol(t->car->value, NULL, 0);
if (cpu >= 0 && (VIR_CPU_MAPLEN(cpu+1) <= maplen)) {
VIR_USE_CPU(cpumap, cpu);
}
}
break;
}
}
if (++nbinfo == maxinfo) break;
ipt++;
}
}
sexpr_free(root);
return(nbinfo);