1 files changed, 61 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/auth/capability_set.go b/pkg/sentry/kernel/auth/capability_set.go
new file mode 100644
index 000000000..7a0c967cd
--- /dev/null
+++ b/pkg/sentry/kernel/auth/capability_set.go
@@ -0,0 +1,61 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package auth
+
+import (
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/bits"
+)
+
+// A CapabilitySet is a set of capabilities implemented as a bitset. The zero
+// value of CapabilitySet is a set containing no capabilities.
+type CapabilitySet uint64
+
+// AllCapabilities is a CapabilitySet containing all valid capabilities.
+var AllCapabilities = CapabilitySetOf(linux.MaxCapability+1) - 1
+
+// CapabilitySetOf returns a CapabilitySet containing only the given
+// capability.
+func CapabilitySetOf(cp linux.Capability) CapabilitySet {
+	return CapabilitySet(bits.MaskOf64(int(cp)))
+}
+
+// CapabilitySetOfMany returns a CapabilitySet containing the given capabilities.
+func CapabilitySetOfMany(cps []linux.Capability) CapabilitySet {
+	var cs uint64
+	for _, cp := range cps {
+		cs |= bits.MaskOf64(int(cp))
+	}
+	return CapabilitySet(cs)
+}
+
+// TaskCapabilities represents all the capability sets for a task. Each of these
+// sets is explained in greater detail in capabilities(7).
+type TaskCapabilities struct {
+	// Permitted is a limiting superset for the effective capabilities that
+	// the thread may assume.
+	PermittedCaps CapabilitySet
+	// Inheritable is a set of capabilities preserved across an execve(2).
+	InheritableCaps CapabilitySet
+	// Effective is the set of capabilities used by the kernel to perform
+	// permission checks for the thread.
+	EffectiveCaps CapabilitySet
+	// Bounding is a limiting superset for the capabilities that a thread
+	// can add to its inheritable set using capset(2).
+	BoundingCaps CapabilitySet
+	// Ambient is a set of capabilities that are preserved across an
+	// execve(2) of a program that is not privileged.
+	AmbientCaps CapabilitySet
+}