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VmClassMemberAccess() should only check access right.
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There is no need for this function to report errors. Function should have responsibility over a single part of the functionality provided. This change also corrects some error messages.
This commit is contained in:
Rafal Kupiec 2019-05-29 15:26:31 +02:00
parent d924d41a7a
commit a5fb8ff8be
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
1 changed files with 13 additions and 19 deletions
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32
engine/vm.c
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@ -1074,7 +1074,7 @@ static ph7_value *VmNewOperandStack(
/* Forward declaration */
static sxi32 VmRegisterSpecialFunction(ph7_vm *pVm);
static int VmInstanceOf(ph7_class *pThis, ph7_class *pClass);
static int VmClassMemberAccess(ph7_vm *pVm, ph7_class *pClass, const SyString *pAttrName, sxi32 iProtection, int bLog);
static int VmClassMemberAccess(ph7_vm *pVm, ph7_class *pClass, sxi32 iProtection);
/*
* Prepare the Virtual Machine for byte-code execution.
* This routine gets called by the PH7 engine after
@ -4193,7 +4193,7 @@ static sxi32 VmByteCodeExec(
&pClass->sName, &sName
);
} else {
if(!VmClassMemberAccess(&(*pVm), pMeth->sFunc.pClass, &sName, pMeth->iProtection, FALSE)) {
if(!VmClassMemberAccess(&(*pVm), pMeth->sFunc.pClass, pMeth->iProtection)) {
PH7_VmThrowError(&(*pVm), PH7_CTX_ERR,
"Access to the class method '%z->%z()' is forbidden", &pMeth->sFunc.pClass->sName, &sName);
}
@ -4244,7 +4244,7 @@ static sxi32 VmByteCodeExec(
if(pObjAttr) {
ph7_value *pValue = 0; /* cc warning */
/* Check attribute access */
if(VmClassMemberAccess(&(*pVm), pClass, &pObjAttr->pAttr->sName, pObjAttr->pAttr->iProtection, FALSE)) {
if(VmClassMemberAccess(&(*pVm), pClass, pObjAttr->pAttr->iProtection)) {
/* Load attribute */
pValue = (ph7_value *)SySetAt(&pVm->aMemObj, pObjAttr->nIdx);
if(pValue) {
@ -4370,7 +4370,7 @@ static sxi32 VmByteCodeExec(
} else {
ph7_value *pValue;
/* Check if the access to the attribute is allowed */
if(VmClassMemberAccess(&(*pVm), pClass, &pAttr->sName, pAttr->iProtection, TRUE)) {
if(VmClassMemberAccess(&(*pVm), pClass, pAttr->iProtection)) {
/* Load the desired attribute */
pValue = (ph7_value *)SySetAt(&pVm->aMemObj, pAttr->nIdx);
if(pValue) {
@ -4380,6 +4380,9 @@ static sxi32 VmByteCodeExec(
pTos->nIdx = pAttr->nIdx;
}
}
} else {
PH7_VmThrowError(&(*pVm), PH7_CTX_ERR, "Access to the class attribute '%z::$%z' is forbidden",
&pClass->sName, &pAttr->sName);
}
}
}
@ -6216,9 +6219,7 @@ static int vm_builtin_get_class_methods(ph7_context *pCtx, int nArg, ph7_value *
static int VmClassMemberAccess(
ph7_vm *pVm, /* Target VM */
ph7_class *pClass, /* Target Class */
const SyString *pAttrName, /* Attribute name */
sxi32 iProtection, /* Attribute protection level [i.e: public,protected or private] */
int bLog /* TRUE to log forbidden access. */
sxi32 iProtection /* Attribute protection level [i.e: public,protected or private] */
) {
if(iProtection != PH7_CLASS_PROT_PUBLIC) {
VmFrame *pFrame = pVm->pFrame;
@ -6229,30 +6230,23 @@ static int VmClassMemberAccess(
}
pVmFunc = (ph7_vm_func *)pFrame->pUserData;
if(pVmFunc == 0 || (pVmFunc->iFlags & VM_FUNC_CLASS_METHOD) == 0) {
goto dis; /* Access is forbidden */
return 0; /* Access is forbidden */
}
if(iProtection == PH7_CLASS_PROT_PRIVATE) {
/* Must be the same instance */
if((ph7_class *)pVmFunc->pUserData != pClass) {
goto dis; /* Access is forbidden */
return 0; /* Access is forbidden */
}
} else {
/* Protected */
ph7_class *pBase = (ph7_class *)pVmFunc->pUserData;
/* Must be a derived class */
if(!VmInstanceOf(pBase, pClass)) {
goto dis; /* Access is forbidden */
return 0; /* Access is forbidden */
}
}
}
return 1; /* Access is granted */
dis:
if(bLog) {
PH7_VmThrowError(&(*pVm), PH7_CTX_ERR,
"Access to the class attribute '%z->%z' is forbidden",
&pClass->sName, pAttrName);
}
return 0; /* Access is forbidden */
}
/*
* array get_class_vars(string/object $class_name)
@ -6295,7 +6289,7 @@ static int vm_builtin_get_class_vars(ph7_context *pCtx, int nArg, ph7_value **ap
while((pEntry = SyHashGetNextEntry(&pClass->hAttr)) != 0) {
ph7_class_attr *pAttr = (ph7_class_attr *)pEntry->pUserData;
/* Check if the access is allowed */
if(VmClassMemberAccess(pCtx->pVm, pClass, &pAttr->sName, pAttr->iProtection, FALSE)) {
if(VmClassMemberAccess(pCtx->pVm, pClass, pAttr->iProtection)) {
SyString *pAttrName = &pAttr->sName;
ph7_value *pValue = 0;
if(pAttr->iFlags & (PH7_CLASS_ATTR_CONSTANT | PH7_CLASS_ATTR_STATIC)) {
@ -6370,7 +6364,7 @@ static int vm_builtin_get_object_vars(ph7_context *pCtx, int nArg, ph7_value **a
}
pAttrName = &pVmAttr->pAttr->sName;
/* Check if the access is allowed */
if(VmClassMemberAccess(pCtx->pVm, pThis->pClass, pAttrName, pVmAttr->pAttr->iProtection, FALSE)) {
if(VmClassMemberAccess(pCtx->pVm, pThis->pClass, pVmAttr->pAttr->iProtection)) {
ph7_value *pValue = 0;
/* Extract attribute */
pValue = PH7_ClassInstanceExtractAttrValue(pThis, pVmAttr);