From: Martin Kletzander <mkletzan@redhat.com> Utilise the new virDomainDefIDsParseString() for that. This is one of the more complex ones since there is also a function that reads relevant metadata from a save image XML. In order not to extract the parsing out of the function (and make the function basically trivial and all callers more complex) add a callback to the function which will be used to check the ACLs. And since this function is called in APIs that perform ACL checks both with and without flags, add two of them for good measure. Fixes: CVE-2025-12748 Reported-by: Святослав Терешин <s.tereshin@fobos-nt.ru> Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- src/ch/ch_driver.c | 76 ++++++++++++++++++++++++++++++++-------------- 1 file changed, 53 insertions(+), 23 deletions(-) diff --git a/src/ch/ch_driver.c b/src/ch/ch_driver.c index ad13306c4cfd..70653aeea7d3 100644 --- a/src/ch/ch_driver.c +++ b/src/ch/ch_driver.c @@ -216,14 +216,19 @@ chDomainCreateXML(virConnectPtr conn, if (flags & VIR_DOMAIN_START_VALIDATE) parse_flags |= VIR_DOMAIN_DEF_PARSE_VALIDATE_SCHEMA; + /* Avoid parsing the whole domain definition for ACL checks */ + if (!(vmdef = virDomainDefIDsParseString(xml, driver->xmlopt, parse_flags))) + return NULL; + + if (virDomainCreateXMLEnsureACL(conn, vmdef) < 0) + return NULL; + + g_clear_pointer(&vmdef, virObjectUnref); if ((vmdef = virDomainDefParseString(xml, driver->xmlopt, NULL, parse_flags)) == NULL) goto cleanup; - if (virDomainCreateXMLEnsureACL(conn, vmdef) < 0) - goto cleanup; - if (!(vm = virDomainObjListAdd(driver->domains, &vmdef, driver->xmlopt, @@ -347,6 +352,15 @@ chDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) if (flags & VIR_DOMAIN_START_VALIDATE) parse_flags |= VIR_DOMAIN_DEF_PARSE_VALIDATE_SCHEMA; + /* Avoid parsing the whole domain definition for ACL checks */ + if (!(vmdef = virDomainDefIDsParseString(xml, driver->xmlopt, parse_flags))) + return NULL; + + if (virDomainDefineXMLFlagsEnsureACL(conn, vmdef) < 0) + return NULL; + + g_clear_pointer(&vmdef, virObjectUnref); + if ((vmdef = virDomainDefParseString(xml, driver->xmlopt, NULL, parse_flags)) == NULL) goto cleanup; @@ -354,9 +368,6 @@ chDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) if (virXMLCheckIllegalChars("name", vmdef->name, "\n") < 0) goto cleanup; - if (virDomainDefineXMLFlagsEnsureACL(conn, vmdef) < 0) - goto cleanup; - if (!(vm = virDomainObjListAdd(driver->domains, &vmdef, driver->xmlopt, 0, &oldDef))) @@ -920,16 +931,24 @@ chDomainSaveXMLRead(int fd) return g_steal_pointer(&xml); } -static int chDomainSaveImageRead(virCHDriver *driver, +static int chDomainSaveImageRead(virConnectPtr conn, const char *path, - virDomainDef **ret_def) + virDomainDef **ret_def, + unsigned int flags, + int (*ensureACL)(virConnectPtr, virDomainDef *), + int (*ensureACLWithFlags)(virConnectPtr, + virDomainDef *, + unsigned int)) { + virCHDriver *driver = conn->privateData; g_autoptr(virCHDriverConfig) cfg = virCHDriverGetConfig(driver); g_autoptr(virDomainDef) def = NULL; g_autofree char *from = NULL; g_autofree char *xml = NULL; VIR_AUTOCLOSE fd = -1; int ret = -1; + unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE | + VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE; from = g_strdup_printf("%s/%s", path, CH_SAVE_XML); if ((fd = virFileOpenAs(from, O_RDONLY, 0, cfg->user, cfg->group, 0)) < 0) { @@ -942,9 +961,23 @@ static int chDomainSaveImageRead(virCHDriver *driver, if (!(xml = chDomainSaveXMLRead(fd))) goto end; - if (!(def = virDomainDefParseString(xml, driver->xmlopt, NULL, - VIR_DOMAIN_DEF_PARSE_INACTIVE | - VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE))) + if (ensureACL || ensureACLWithFlags) { + /* Parse only the IDs for ACL checks */ + g_autoptr(virDomainDef) aclDef = virDomainDefIDsParseString(xml, + driver->xmlopt, + parse_flags); + + if (!aclDef) + goto end; + + if (ensureACL && ensureACL(conn, aclDef) < 0) + goto end; + + if (ensureACLWithFlags && ensureACLWithFlags(conn, aclDef, flags) < 0) + goto end; + } + + if (!(def = virDomainDefParseString(xml, driver->xmlopt, NULL, parse_flags))) goto end; *ret_def = g_steal_pointer(&def); @@ -965,10 +998,9 @@ chDomainSaveImageGetXMLDesc(virConnectPtr conn, virCheckFlags(VIR_DOMAIN_SAVE_IMAGE_XML_SECURE, NULL); - if (chDomainSaveImageRead(driver, path, &def) < 0) - goto cleanup; - - if (virDomainSaveImageGetXMLDescEnsureACL(conn, def) < 0) + if (chDomainSaveImageRead(conn, path, &def, flags, + virDomainSaveImageGetXMLDescEnsureACL, + NULL) < 0) goto cleanup; ret = virDomainDefFormat(def, driver->xmlopt, @@ -1068,10 +1100,9 @@ chDomainManagedSaveGetXMLDesc(virDomainPtr dom, unsigned int flags) goto cleanup; path = chDomainManagedSavePath(driver, vm); - if (chDomainSaveImageRead(driver, path, &def) < 0) - goto cleanup; - - if (virDomainManagedSaveGetXMLDescEnsureACL(dom->conn, def, flags) < 0) + if (chDomainSaveImageRead(dom->conn, path, &def, flags, + NULL, + virDomainManagedSaveGetXMLDescEnsureACL) < 0) goto cleanup; ret = virDomainDefFormat(def, driver->xmlopt, @@ -1123,10 +1154,9 @@ chDomainRestoreFlags(virConnectPtr conn, return -1; } - if (chDomainSaveImageRead(driver, from, &def) < 0) - goto cleanup; - - if (virDomainRestoreFlagsEnsureACL(conn, def) < 0) + if (chDomainSaveImageRead(conn, from, &def, flags, + virDomainRestoreFlagsEnsureACL, + NULL) < 0) goto cleanup; if (chDomainSaveRestoreAdditionalValidation(driver, def) < 0) -- 2.51.2