70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
package seccomp
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import (
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"bytes"
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"fmt"
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"sync"
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"golang.org/x/sys/unix"
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)
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// kernelVersion holds information about the kernel.
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type kernelVersion struct {
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kernel uint // Version of the kernel (i.e., the "4" in "4.1.2-generic")
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major uint // Major revision of the kernel (i.e., the "1" in "4.1.2-generic")
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}
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var (
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currentKernelVersion *kernelVersion
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kernelVersionError error
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once sync.Once
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)
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// getKernelVersion gets the current kernel version.
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func getKernelVersion() (*kernelVersion, error) {
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once.Do(func() {
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var uts unix.Utsname
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if err := unix.Uname(&uts); err != nil {
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return
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}
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// Remove the \x00 from the release for Atoi to parse correctly
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currentKernelVersion, kernelVersionError = parseRelease(string(uts.Release[:bytes.IndexByte(uts.Release[:], 0)]))
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})
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return currentKernelVersion, kernelVersionError
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}
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// parseRelease parses a string and creates a kernelVersion based on it.
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func parseRelease(release string) (*kernelVersion, error) {
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var version = kernelVersion{}
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// We're only make sure we get the "kernel" and "major revision". Sometimes we have
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// 3.12.25-gentoo, but sometimes we just have 3.12-1-amd64.
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_, err := fmt.Sscanf(release, "%d.%d", &version.kernel, &version.major)
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if err != nil {
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return nil, fmt.Errorf("failed to parse kernel version %q: %w", release, err)
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}
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return &version, nil
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}
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// kernelGreaterEqualThan checks if the host's kernel version is greater than, or
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// equal to the given kernel version v. Only "kernel version" and "major revision"
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// can be specified (e.g., "3.12") and will be taken into account, which means
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// that 3.12.25-gentoo and 3.12-1-amd64 are considered equal (kernel: 3, major: 12).
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func kernelGreaterEqualThan(v string) (bool, error) {
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minVersion, err := parseRelease(v)
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if err != nil {
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return false, err
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}
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kv, err := getKernelVersion()
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if err != nil {
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return false, err
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}
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if kv.kernel > minVersion.kernel {
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return true, nil
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}
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if kv.kernel == minVersion.kernel && kv.major >= minVersion.major {
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return true, nil
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}
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return false, nil
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}
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