89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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Copyright The runc Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package seccomp
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import (
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"bufio"
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"os"
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"strings"
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"golang.org/x/sys/unix"
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)
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// isEnabled returns if the kernel has been configured to support seccomp.
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// From https://github.com/opencontainers/runc/blob/v1.0.0-rc91/libcontainer/seccomp/seccomp_linux.go#L86-L102
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func isEnabled() bool {
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// Try to read from /proc/self/status for kernels > 3.8
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s, err := parseStatusFile("/proc/self/status")
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if err != nil {
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// Check if Seccomp is supported, via CONFIG_SECCOMP.
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if err := unix.Prctl(unix.PR_GET_SECCOMP, 0, 0, 0, 0); err != unix.EINVAL {
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// Make sure the kernel has CONFIG_SECCOMP_FILTER.
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if err := unix.Prctl(unix.PR_SET_SECCOMP, unix.SECCOMP_MODE_FILTER, 0, 0, 0); err != unix.EINVAL {
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return true
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}
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}
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return false
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}
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_, ok := s["Seccomp"]
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return ok
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}
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// parseStatusFile is from https://github.com/opencontainers/runc/blob/v1.0.0-rc91/libcontainer/seccomp/seccomp_linux.go#L243-L268
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func parseStatusFile(path string) (map[string]string, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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s := bufio.NewScanner(f)
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status := make(map[string]string)
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for s.Scan() {
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text := s.Text()
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parts := strings.Split(text, ":")
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if len(parts) <= 1 {
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continue
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}
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status[parts[0]] = parts[1]
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return status, nil
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}
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