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bugfix: avoid NPE possibility by making composition environment global

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This commit is contained in:
Alexander Zielenski 2024-01-29 13:45:27 -08:00
parent 18fbc48b01
commit 3094395fa7
2 changed files with 26 additions and 12 deletions
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17
staging/src/k8s.io/apiserver/pkg/admission/plugin/cel/composition.go
View File

@ -54,13 +54,22 @@ func NewCompositedCompiler(envSet *environment.EnvSet) (*CompositedCompiler, err
if err != nil {
return nil, err
}
compiler := NewCompiler(compositionContext.EnvSet)
filterCompiler := NewFilterCompiler(compositionContext.EnvSet)
return NewCompositedCompilerFromTemplate(compositionContext), nil
}
func NewCompositedCompilerFromTemplate(context *CompositionEnv) *CompositedCompiler {
context = &CompositionEnv{
MapType: context.MapType,
EnvSet: context.EnvSet,
CompiledVariables: map[string]CompilationResult{},
}
compiler := NewCompiler(context.EnvSet)
filterCompiler := NewFilterCompiler(context.EnvSet)
return &CompositedCompiler{
Compiler: compiler,
FilterCompiler: filterCompiler,
CompositionEnv: compositionContext,
}, nil
CompositionEnv: context,
}
}
func (c *CompositedCompiler) CompileAndStoreVariables(variables []NamedExpressionAccessor, options OptionalVariableDeclarations, mode environment.Type) {

21
staging/src/k8s.io/apiserver/pkg/admission/plugin/policy/validating/plugin.go
View File

@ -23,7 +23,6 @@ import (
v1 "k8s.io/api/admissionregistration/v1"
"k8s.io/api/admissionregistration/v1beta1"
"k8s.io/apimachinery/pkg/api/meta"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/admission/initializer"
"k8s.io/apiserver/pkg/admission/plugin/cel"
@ -44,6 +43,17 @@ const (
PluginName = "ValidatingAdmissionPolicy"
)
var (
compositionEnvTemplate *cel.CompositionEnv = func() *cel.CompositionEnv {
compositionEnvTemplate, err := cel.NewCompositionEnv(cel.VariablesTypeName, environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion()))
if err != nil {
panic(err)
}
return compositionEnvTemplate
}()
)
// Register registers a plugin
func Register(plugins *admission.Plugins) {
plugins.Register(PluginName, func(configFile io.Reader) (admission.Interface, error) {
@ -110,13 +120,8 @@ func compilePolicy(policy *Policy) Validator {
var matcher matchconditions.Matcher = nil
matchConditions := policy.Spec.MatchConditions
filterCompiler, err := cel.NewCompositedCompiler(environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion()))
if err == nil {
filterCompiler.CompileAndStoreVariables(convertv1beta1Variables(policy.Spec.Variables), optionalVars, environment.StoredExpressions)
} else {
//!TODO: return a validator that always fails with internal error?
utilruntime.HandleError(err)
}
filterCompiler := cel.NewCompositedCompilerFromTemplate(compositionEnvTemplate)
filterCompiler.CompileAndStoreVariables(convertv1beta1Variables(policy.Spec.Variables), optionalVars, environment.StoredExpressions)
if len(matchConditions) > 0 {
matchExpressionAccessors := make([]cel.ExpressionAccessor, len(matchConditions))