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conf: Rework <tpm/> formatting

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The <tpm/> element formatting is handled in
virDomainTPMDefFormat() which uses the "old style" - appending
strings directly into the output buffer. With this, it's easy to
get conditions that tell when an element has ended wrong. In this
particular case, if both <encryption/> and <active_pcr_banks/>
are to be formatted the current code puts a stray '>' into the
output buffer, resulting in invalid XML.

Rewrite the function to use virXMLFormatElement() which is more
clever.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2016599#c15
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Michal Privoznik 2022-01-04 08:24:25 +01:00
parent d00e6dfe6b
commit 5e2a368c61
1 changed files with 22 additions and 31 deletions
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53
src/conf/domain_conf.c
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@ -25495,63 +25495,54 @@ virDomainTPMDefFormat(virBuffer *buf,
virDomainTPMDef *def,
unsigned int flags)
{
virBufferAsprintf(buf, "<tpm model='%s'>\n",
g_auto(virBuffer) attrBuf = VIR_BUFFER_INITIALIZER;
g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf);
g_auto(virBuffer) backendAttrBuf = VIR_BUFFER_INITIALIZER;
g_auto(virBuffer) backendChildBuf = VIR_BUFFER_INIT_CHILD(&childBuf);
virBufferAsprintf(&attrBuf, " model='%s'",
virDomainTPMModelTypeToString(def->model));
virBufferAdjustIndent(buf, 2);
virBufferAsprintf(buf, "<backend type='%s'",
virBufferAsprintf(&backendAttrBuf, " type='%s'",
virDomainTPMBackendTypeToString(def->type));
switch (def->type) {
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
virBufferAddLit(buf, ">\n");
virBufferAdjustIndent(buf, 2);
virBufferEscapeString(buf, "<device path='%s'/>\n",
virBufferEscapeString(&backendChildBuf, "<device path='%s'/>\n",
def->data.passthrough.source->data.file.path);
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</backend>\n");
break;
case VIR_DOMAIN_TPM_TYPE_EMULATOR:
virBufferAsprintf(buf, " version='%s'",
virBufferAsprintf(&backendAttrBuf, " version='%s'",
virDomainTPMVersionTypeToString(def->version));
if (def->data.emulator.persistent_state)
virBufferAddLit(buf, " persistent_state='yes'");
virBufferAddLit(&backendAttrBuf, " persistent_state='yes'");
if (def->data.emulator.hassecretuuid) {
char uuidstr[VIR_UUID_STRING_BUFLEN];
virBufferAddLit(buf, ">\n");
virBufferAdjustIndent(buf, 2);
virBufferAsprintf(buf, "<encryption secret='%s'/>\n",
virUUIDFormat(def->data.emulator.secretuuid, uuidstr));
virBufferAdjustIndent(buf, -2);
virBufferAsprintf(&backendChildBuf, "<encryption secret='%s'/>\n",
virUUIDFormat(def->data.emulator.secretuuid, uuidstr));
}
if (def->data.emulator.activePcrBanks) {
g_auto(virBuffer) activePcrBanksBuf = VIR_BUFFER_INIT_CHILD(&backendChildBuf);
size_t i;
virBufferAddLit(buf, ">\n");
virBufferAdjustIndent(buf, 2);
virBufferAddLit(buf, "<active_pcr_banks>\n");
virBufferAdjustIndent(buf, 2);
for (i = VIR_DOMAIN_TPM_PCR_BANK_SHA1; i < VIR_DOMAIN_TPM_PCR_BANK_LAST; i++) {
if ((def->data.emulator.activePcrBanks & (1 << i)))
virBufferAsprintf(buf, "<%s/>\n",
virBufferAsprintf(&activePcrBanksBuf, "<%s/>\n",
virDomainTPMPcrBankTypeToString(i));
}
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</active_pcr_banks>\n");
virBufferAdjustIndent(buf, -2);
virXMLFormatElement(&backendChildBuf, "active_pcr_banks", NULL, &activePcrBanksBuf);
}
if (def->data.emulator.hassecretuuid ||
def->data.emulator.activePcrBanks)
virBufferAddLit(buf, "</backend>\n");
else
virBufferAddLit(buf, "/>\n");
break;
case VIR_DOMAIN_TPM_TYPE_LAST:
break;
}
virDomainDeviceInfoFormat(buf, &def->info, flags);
virXMLFormatElement(&childBuf, "backend", &backendAttrBuf, &backendChildBuf);
virDomainDeviceInfoFormat(&childBuf, &def->info, flags);
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</tpm>\n");
virXMLFormatElement(buf, "tpm", &attrBuf, &childBuf);
return 0;
}