[auditbeat] fim: implement kprobes backend

CHANGELOG.next.asciidoc

@@ -22,6 +22,7 @@ fields added to events containing the Beats version. {pull}37553[37553]
 
 *Auditbeat*
 
+- Add opt-in `KProbes` backend for file_integrity module. {pull}37796[37796]
 
 *Filebeat*
 

NOTICE.txt

@@ -15825,6 +15825,218 @@ Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected]/LIC
    limitations under the License.
 
 
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+Dependency : github.com/elastic/tk-btf
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 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/toutoumomoma
 Version: v0.0.0-20221026030040-594ef30cb640

auditbeat/docs/modules/file_integrity.asciidoc

@@ -32,6 +32,7 @@ The operating system features that power this feature are as follows.
 By default, `fsnotify` is used, and therefore the kernel must have inotify support.
 Inotify was initially merged into the 2.6.13 Linux kernel.
 The eBPF backend uses modern eBPF features and supports 5.10.16+ kernels.
+The `Kprobes` backend uses tracefs and supports 3.10+ kernels.
 FSNotify doesn't have the ability to associate user data to file events.
 The preferred backend can be selected by specifying the `backend` config option.
 Since eBPF and Kprobes are in technical preview, `auto` will default to `fsnotify`.

auditbeat/module/file_integrity/_meta/docs.asciidoc

@@ -25,6 +25,7 @@ The operating system features that power this feature are as follows.
 By default, `fsnotify` is used, and therefore the kernel must have inotify support.
 Inotify was initially merged into the 2.6.13 Linux kernel.
 The eBPF backend uses modern eBPF features and supports 5.10.16+ kernels.
+The `Kprobes` backend uses tracefs and supports 3.10+ kernels.
 FSNotify doesn't have the ability to associate user data to file events.
 The preferred backend can be selected by specifying the `backend` config option.
 Since eBPF and Kprobes are in technical preview, `auto` will default to `fsnotify`.

auditbeat/module/file_integrity/event.go

@@ -67,12 +67,15 @@ const (
 	SourceFSNotify
 	// SourceEBPF identifies events triggered by an eBPF program.
 	SourceEBPF
+	// SourceKProbes identifies events triggered by KProbes.
+	SourceKProbes
 )
 
 var sourceNames = map[Source]string{
 	SourceScan:     "scan",
 	SourceFSNotify: "fsnotify",
 	SourceEBPF:     "ebpf",
+	SourceKProbes:  "kprobes",
 }
 
 // Type identifies the file type (e.g. dir, file, symlink).