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In situations where docker runs in an environment where capabilities are limited, sucn as docker-in-docker in a container created by older versions of docker, or in a container where some capabilities have been disabled, starting a privileged container may fail, because even though the _kernel_ supports a capability, the capability is not available. This patch attempts to address this problem by limiting the list of "known" capa- bilities on the set of effective capabilties for the current process. This code is based on the code in containerd's "caps" package. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
35 lines
1 KiB
Go
35 lines
1 KiB
Go
package caps // import "github.com/docker/docker/oci/caps"
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import (
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"sync"
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ccaps "github.com/containerd/containerd/pkg/cap"
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"github.com/sirupsen/logrus"
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)
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var initCapsOnce sync.Once
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func initCaps() {
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initCapsOnce.Do(func() {
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rawCaps := ccaps.Known()
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curCaps, err := ccaps.Current()
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if err != nil {
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logrus.WithError(err).Error("failed to get capabilities from current environment")
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allCaps = rawCaps
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} else {
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allCaps = curCaps
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}
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knownCaps = make(map[string]*struct{}, len(rawCaps))
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for _, capName := range rawCaps {
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// For now, we assume the capability is available if we failed to
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// get the capabilities from the current environment. This keeps the
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// old (pre-detection) behavior, and prevents creating containers with
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// no capabilities. The OCI runtime or kernel may still refuse capa-
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// bilities that are not available, and produce an error in that case.
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if len(curCaps) > 0 && !inSlice(curCaps, capName) {
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knownCaps[capName] = nil
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continue
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}
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knownCaps[capName] = &struct{}{}
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}
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})
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}
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