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(Backport v0.37.x)fix: prevent hash collisions while resolving subnets, security groups and AMIs from nodeclass selectors #8665

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Merged
merged 1 commit into from
Oct 24, 2025
Merged

(Backport v0.37.x)fix: prevent hash collisions while resolving subnets, security groups and AMIs from nodeclass selectors #8665

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2 changes: 1 addition & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ require (
github.com/awslabs/amazon-eks-ami/nodeadm v0.0.0-20240229193347-cfab22a10647
github.com/awslabs/operatorpkg v0.0.0-20240518001059-1e35978ba21b
github.com/go-logr/zapr v1.3.0
github.com/google/uuid v1.6.0
github.com/imdario/mergo v0.3.16
github.com/mitchellh/hashstructure/v2 v2.0.2
github.com/onsi/ginkgo/v2 v2.20.0
Expand Down Expand Up @@ -64,7 +65,6 @@ require (
github.com/google/go-cmp v0.6.0 // indirect
github.com/google/gofuzz v1.2.0 // indirect
github.com/google/pprof v0.0.0-20240727154555-813a5fbdbec8 // indirect
github.com/google/uuid v1.6.0 // indirect
github.com/grpc-ecosystem/grpc-gateway/v2 v2.21.0 // indirect
github.com/hashicorp/golang-lru v1.0.2 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect
Expand Down
30 changes: 19 additions & 11 deletions pkg/cloudprovider/suite_test.go
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Expand Up @@ -618,7 +618,7 @@ var _ = Describe("CloudProvider", func() {
},
},
})
awsEnv.EC2API.DescribeSecurityGroupsOutput.Set(&ec2.DescribeSecurityGroupsOutput{
awsEnv.EC2API.DescribeSecurityGroupsBehavior.Output.Set(&ec2.DescribeSecurityGroupsOutput{
SecurityGroups: []*ec2.SecurityGroup{
{
GroupId: aws.String(validSecurityGroup),
Expand All @@ -632,7 +632,7 @@ var _ = Describe("CloudProvider", func() {
},
},
})
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{
awsEnv.EC2API.DescribeSubnetsBehavior.Output.Set(&ec2.DescribeSubnetsOutput{
Subnets: []*ec2.Subnet{
{
SubnetId: aws.String(validSubnet1),
Expand Down Expand Up @@ -1084,7 +1084,7 @@ var _ = Describe("CloudProvider", func() {
})
It("should launch instances into subnet with the most available IP addresses", func() {
awsEnv.SubnetCache.Flush()
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
awsEnv.EC2API.DescribeSubnetsBehavior.Output.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
{SubnetId: aws.String("test-subnet-1"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(10),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-1")}}},
{SubnetId: aws.String("test-subnet-2"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(100),
Expand All @@ -1101,7 +1101,7 @@ var _ = Describe("CloudProvider", func() {
})
It("should launch instances into subnet with the most available IP addresses in-between cache refreshes", func() {
awsEnv.SubnetCache.Flush()
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
awsEnv.EC2API.DescribeSubnetsBehavior.Output.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
{SubnetId: aws.String("test-subnet-1"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(10),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-1")}}},
{SubnetId: aws.String("test-subnet-2"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(11),
Expand All @@ -1126,7 +1126,7 @@ var _ = Describe("CloudProvider", func() {
Expect(fake.SubnetsFromFleetRequest(createFleetInput)).To(ConsistOf("test-subnet-1"))
})
It("should update in-flight IPs when a CreateFleet error occurs", func() {
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
awsEnv.EC2API.DescribeSubnetsBehavior.Output.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
{SubnetId: aws.String("test-subnet-1"), AvailabilityZone: aws.String("test-zone-1a"), AvailableIpAddressCount: aws.Int64(10),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-1")}}},
}})
Expand All @@ -1137,12 +1137,20 @@ var _ = Describe("CloudProvider", func() {
Expect(len(bindings)).To(Equal(0))
})
It("should launch instances into subnets that are excluded by another NodePool", func() {
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
{SubnetId: aws.String("test-subnet-1"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(10),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-1")}}},
{SubnetId: aws.String("test-subnet-2"), AvailabilityZone: aws.String("test-zone-1b"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(100),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-2")}}},
}})
awsEnv.EC2API.Subnets.Store("test-zone-1a", &ec2.Subnet{
SubnetId: aws.String("test-subnet-1"),
AvailabilityZone: aws.String("test-zone-1a"),
AvailabilityZoneId: aws.String("tstz1-1a"),
AvailableIpAddressCount: aws.Int64(10),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-1")}},
})
awsEnv.EC2API.Subnets.Store("test-zone-1b", &ec2.Subnet{
SubnetId: aws.String("test-subnet-2"),
AvailabilityZone: aws.String("test-zone-1b"),
AvailabilityZoneId: aws.String("tstz1-1a"),
AvailableIpAddressCount: aws.Int64(100),
Tags: []*ec2.Tag{{Key: aws.String("Name"), Value: aws.String("test-subnet-2")}},
})
nodeClass.Spec.SubnetSelectorTerms = []v1beta1.SubnetSelectorTerm{{Tags: map[string]string{"Name": "test-subnet-1"}}}
ExpectApplied(ctx, env.Client, nodePool, nodeClass)
controller := status.NewController(env.Client, awsEnv.SubnetProvider, awsEnv.SecurityGroupProvider, awsEnv.AMIProvider, awsEnv.InstanceProfileProvider, awsEnv.LaunchTemplateProvider)
Expand Down
2 changes: 1 addition & 1 deletion pkg/controllers/nodeclass/status/subnet_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ var _ = Describe("NodeClass Subnet Status Controller", func() {
}))
})
It("Should have the correct ordering for the Subnets", func() {
awsEnv.EC2API.DescribeSubnetsOutput.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
awsEnv.EC2API.DescribeSubnetsBehavior.Output.Set(&ec2.DescribeSubnetsOutput{Subnets: []*ec2.Subnet{
{SubnetId: aws.String("subnet-test1"), AvailabilityZone: aws.String("test-zone-1a"), AvailabilityZoneId: aws.String("tstz1-1a"), AvailableIpAddressCount: aws.Int64(20)},
{SubnetId: aws.String("subnet-test2"), AvailabilityZone: aws.String("test-zone-1b"), AvailabilityZoneId: aws.String("tstz1-1b"), AvailableIpAddressCount: aws.Int64(100)},
{SubnetId: aws.String("subnet-test3"), AvailabilityZone: aws.String("test-zone-1c"), AvailabilityZoneId: aws.String("tstz1-1c"), AvailableIpAddressCount: aws.Int64(50)},
Expand Down
6 changes: 6 additions & 0 deletions pkg/controllers/providers/ssm/invalidation/controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@ import (
"sigs.k8s.io/karpenter/pkg/operator/controller"
"sigs.k8s.io/karpenter/pkg/operator/injection"

metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/uuid"

"github.com/aws/karpenter-provider-aws/pkg/apis/v1beta1"
"github.com/aws/karpenter-provider-aws/pkg/providers/amifamily"
"github.com/aws/karpenter-provider-aws/pkg/providers/ssm"
Expand Down Expand Up @@ -65,6 +68,9 @@ func (c *Controller) Reconcile(ctx context.Context, _ reconcile.Request) (reconc
amis := []amifamily.AMI{}
for _, nodeClass := range lo.Map(lo.Keys(amiIDsToParameters), func(amiID string, _ int) *v1beta1.EC2NodeClass {
return &v1beta1.EC2NodeClass{
ObjectMeta: metav1.ObjectMeta{
UID: uuid.NewUUID(), // ensures that this doesn't hit the AMI cache.
},
Spec: v1beta1.EC2NodeClassSpec{
AMISelectorTerms: []v1beta1.AMISelectorTerm{{ID: amiID}},
},
Expand Down
4 changes: 2 additions & 2 deletions pkg/controllers/providers/ssm/invalidation/suite_test.go
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Expand Up @@ -87,7 +87,7 @@ var _ = Describe("SSM Invalidation Controller", func() {
Expect(err).To(BeNil())
currentEntries := getSSMCacheEntries()
Expect(len(currentEntries)).To(Equal(2))
awsEnv.EC2Cache.Flush()
awsEnv.AMICache.Flush()
ExpectReconcileSucceeded(ctx, invalidationController, client.ObjectKey{})
awsEnv.SSMAPI.Reset()
_, err = awsEnv.AMIProvider.List(ctx, nodeClass)
Expand All @@ -106,7 +106,7 @@ var _ = Describe("SSM Invalidation Controller", func() {
currentEntries := getSSMCacheEntries()
deprecateAMIs(lo.Values(currentEntries)...)
Expect(len(currentEntries)).To(Equal(2))
awsEnv.EC2Cache.Flush()
awsEnv.AMICache.Flush()
ExpectReconcileSucceeded(ctx, invalidationController, client.ObjectKey{})
awsEnv.SSMAPI.Reset()
_, err = awsEnv.AMIProvider.List(ctx, nodeClass)
Expand Down
7 changes: 7 additions & 0 deletions pkg/fake/atomic.go
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,13 @@ func (a *AtomicPtrSlice[T]) Pop() *T {
return last
}

func (a *AtomicPtrSlice[T]) At(index int) *T {
a.mu.Lock()
defer a.mu.Unlock()

return clone(a.values[index])
}

func (a *AtomicPtrSlice[T]) ForEach(fn func(*T)) {
a.mu.RLock()
defer a.mu.RUnlock()
Expand Down
193 changes: 98 additions & 95 deletions pkg/fake/ec2api.go
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Expand Up @@ -48,8 +48,8 @@ type CapacityPool struct {
type EC2Behavior struct {
DescribeImagesOutput AtomicPtr[ec2.DescribeImagesOutput]
DescribeLaunchTemplatesOutput AtomicPtr[ec2.DescribeLaunchTemplatesOutput]
DescribeSubnetsOutput AtomicPtr[ec2.DescribeSubnetsOutput]
DescribeSecurityGroupsOutput AtomicPtr[ec2.DescribeSecurityGroupsOutput]
DescribeSubnetsBehavior MockedFunction[ec2.DescribeSubnetsInput, ec2.DescribeSubnetsOutput]
DescribeSecurityGroupsBehavior MockedFunction[ec2.DescribeSecurityGroupsInput, ec2.DescribeSecurityGroupsOutput]
DescribeInstanceTypesOutput AtomicPtr[ec2.DescribeInstanceTypesOutput]
DescribeInstanceTypeOfferingsOutput AtomicPtr[ec2.DescribeInstanceTypeOfferingsOutput]
DescribeAvailabilityZonesOutput AtomicPtr[ec2.DescribeAvailabilityZonesOutput]
Expand All @@ -61,6 +61,7 @@ type EC2Behavior struct {
CreateTagsBehavior MockedFunction[ec2.CreateTagsInput, ec2.CreateTagsOutput]
CalledWithCreateLaunchTemplateInput AtomicPtrSlice[ec2.CreateLaunchTemplateInput]
CalledWithDescribeImagesInput AtomicPtrSlice[ec2.DescribeImagesInput]
Subnets sync.Map
Instances sync.Map
LaunchTemplates sync.Map
InsufficientCapacityPools atomic.Slice[CapacityPool]
Expand All @@ -84,8 +85,8 @@ var DefaultSupportedUsageClasses = aws.StringSlice([]string{"on-demand", "spot"}
func (e *EC2API) Reset() {
e.DescribeImagesOutput.Reset()
e.DescribeLaunchTemplatesOutput.Reset()
e.DescribeSubnetsOutput.Reset()
e.DescribeSecurityGroupsOutput.Reset()
e.DescribeSubnetsBehavior.Reset()
e.DescribeSecurityGroupsBehavior.Reset()
e.DescribeInstanceTypesOutput.Reset()
e.DescribeInstanceTypeOfferingsOutput.Reset()
e.DescribeAvailabilityZonesOutput.Reset()
Expand Down Expand Up @@ -405,107 +406,109 @@ func (e *EC2API) DeleteLaunchTemplateWithContext(_ context.Context, input *ec2.D
}

func (e *EC2API) DescribeSubnetsWithContext(_ context.Context, input *ec2.DescribeSubnetsInput, _ ...request.Option) (*ec2.DescribeSubnetsOutput, error) {
if !e.NextError.IsNil() {
defer e.NextError.Reset()
return nil, e.NextError.Get()
}
if !e.DescribeSubnetsOutput.IsNil() {
describeSubnetsOutput := e.DescribeSubnetsOutput.Clone()
describeSubnetsOutput.Subnets = FilterDescribeSubnets(describeSubnetsOutput.Subnets, input.Filters)
return describeSubnetsOutput, nil
}
subnets := []*ec2.Subnet{
{
SubnetId: aws.String("subnet-test1"),
AvailabilityZone: aws.String("test-zone-1a"),
AvailabilityZoneId: aws.String("tstz1-1a"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(false),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-1")},
{Key: aws.String("foo"), Value: aws.String("bar")},
return e.DescribeSubnetsBehavior.Invoke(input, func(input *ec2.DescribeSubnetsInput) (*ec2.DescribeSubnetsOutput, error) {
output := &ec2.DescribeSubnetsOutput{}
e.Subnets.Range(func(key, value any) bool {
subnet := value.(*ec2.Subnet)
if lo.Contains(lo.Map(input.SubnetIds, func(s *string, _ int) string { return lo.FromPtr(s) }), lo.FromPtr(subnet.SubnetId)) || len(input.Filters) != 0 && len(FilterDescribeSubnets([]*ec2.Subnet{subnet}, input.Filters)) != 0 {
output.Subnets = append(output.Subnets, subnet)
}
return true
})
if len(output.Subnets) != 0 {
return output, nil
}

defaultSubnets := []*ec2.Subnet{
{
SubnetId: aws.String("subnet-test1"),
AvailabilityZone: aws.String("test-zone-1a"),
AvailabilityZoneId: aws.String("tstz1-1a"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(false),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-1")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
VpcId: aws.String("vpc-test1"),
},
},
{
SubnetId: aws.String("subnet-test2"),
AvailabilityZone: aws.String("test-zone-1b"),
AvailabilityZoneId: aws.String("tstz1-1b"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(true),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-2")},
{Key: aws.String("foo"), Value: aws.String("bar")},
{
SubnetId: aws.String("subnet-test2"),
AvailabilityZone: aws.String("test-zone-1b"),
AvailabilityZoneId: aws.String("tstz1-1b"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(true),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-2")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
VpcId: aws.String("vpc-test1"),
},
},
{
SubnetId: aws.String("subnet-test3"),
AvailabilityZone: aws.String("test-zone-1c"),
AvailabilityZoneId: aws.String("tstz1-1c"),
AvailableIpAddressCount: aws.Int64(100),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-3")},
{Key: aws.String("TestTag")},
{Key: aws.String("foo"), Value: aws.String("bar")},
{
SubnetId: aws.String("subnet-test3"),
AvailabilityZone: aws.String("test-zone-1c"),
AvailabilityZoneId: aws.String("tstz1-1c"),
AvailableIpAddressCount: aws.Int64(100),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-3")},
{Key: aws.String("TestTag")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
VpcId: aws.String("vpc-test1"),
},
},
{
SubnetId: aws.String("subnet-test4"),
AvailabilityZone: aws.String("test-zone-1a-local"),
AvailabilityZoneId: aws.String("tstz1-1alocal"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(true),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-4")},
{
SubnetId: aws.String("subnet-test4"),
AvailabilityZone: aws.String("test-zone-1a-local"),
AvailabilityZoneId: aws.String("tstz1-1alocal"),
AvailableIpAddressCount: aws.Int64(100),
MapPublicIpOnLaunch: aws.Bool(true),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-subnet-4")},
},
VpcId: aws.String("vpc-test1"),
},
},
}
if len(input.Filters) == 0 {
return nil, fmt.Errorf("InvalidParameterValue: The filter 'null' is invalid")
}
return &ec2.DescribeSubnetsOutput{Subnets: FilterDescribeSubnets(subnets, input.Filters)}, nil
}
if len(input.Filters) == 0 {
return nil, fmt.Errorf("InvalidParameterValue: The filter 'null' is invalid")
}
return &ec2.DescribeSubnetsOutput{Subnets: FilterDescribeSubnets(defaultSubnets, input.Filters)}, nil
})
}

func (e *EC2API) DescribeSecurityGroupsWithContext(_ context.Context, input *ec2.DescribeSecurityGroupsInput, _ ...request.Option) (*ec2.DescribeSecurityGroupsOutput, error) {
if !e.NextError.IsNil() {
defer e.NextError.Reset()
return nil, e.NextError.Get()
}
if !e.DescribeSecurityGroupsOutput.IsNil() {
describeSecurityGroupsOutput := e.DescribeSecurityGroupsOutput.Clone()
describeSecurityGroupsOutput.SecurityGroups = FilterDescribeSecurtyGroups(describeSecurityGroupsOutput.SecurityGroups, input.Filters)
return e.DescribeSecurityGroupsOutput.Clone(), nil
}
sgs := []*ec2.SecurityGroup{
{
GroupId: aws.String("sg-test1"),
GroupName: aws.String("securityGroup-test1"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-1")},
{Key: aws.String("foo"), Value: aws.String("bar")},
return e.DescribeSecurityGroupsBehavior.Invoke(input, func(input *ec2.DescribeSecurityGroupsInput) (*ec2.DescribeSecurityGroupsOutput, error) {
defaultSecurityGroups := []*ec2.SecurityGroup{
{
GroupId: aws.String("sg-test1"),
GroupName: aws.String("securityGroup-test1"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-1")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
},
},
{
GroupId: aws.String("sg-test2"),
GroupName: aws.String("securityGroup-test2"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-2")},
{Key: aws.String("foo"), Value: aws.String("bar")},
{
GroupId: aws.String("sg-test2"),
GroupName: aws.String("securityGroup-test2"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-2")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
},
},
{
GroupId: aws.String("sg-test3"),
GroupName: aws.String("securityGroup-test3"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-3")},
{Key: aws.String("TestTag")},
{Key: aws.String("foo"), Value: aws.String("bar")},
{
GroupId: aws.String("sg-test3"),
GroupName: aws.String("securityGroup-test3"),
Tags: []*ec2.Tag{
{Key: aws.String("Name"), Value: aws.String("test-security-group-3")},
{Key: aws.String("TestTag")},
{Key: aws.String("foo"), Value: aws.String("bar")},
},
},
},
}
if len(input.Filters) == 0 {
return nil, fmt.Errorf("InvalidParameterValue: The filter 'null' is invalid")
}
return &ec2.DescribeSecurityGroupsOutput{SecurityGroups: FilterDescribeSecurtyGroups(sgs, input.Filters)}, nil
}
if len(input.Filters) == 0 {
return nil, fmt.Errorf("InvalidParameterValue: The filter 'null' is invalid")
}
return &ec2.DescribeSecurityGroupsOutput{SecurityGroups: FilterDescribeSecurtyGroups(defaultSecurityGroups, input.Filters)}, nil
})
}

func (e *EC2API) DescribeAvailabilityZonesWithContext(context.Context, *ec2.DescribeAvailabilityZonesInput, ...request.Option) (*ec2.DescribeAvailabilityZonesOutput, error) {
Expand Down
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