chore(pkg/driver): do not fail if /sys/kernel/debug fails to be mounted.

Also check if `/sys/kernel/debug/tracing` exists.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/distribution/distribution/v3 v3.0.0-20230608105614-4501a6e06d3b
 	github.com/docker/cli v24.0.7+incompatible
 	github.com/docker/docker v24.0.7+incompatible
-	github.com/falcosecurity/driverkit v0.15.5-0.20231108173325-1babd00be84f
+	github.com/falcosecurity/driverkit v0.16.0
 	github.com/go-oauth2/oauth2/v4 v4.5.2
 	github.com/golang-jwt/jwt v3.2.2+incompatible
 	github.com/google/go-containerregistry v0.16.1

go.sum

@@ -333,8 +333,8 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
 github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5ynNVH9qI8YYLbd1fK2po=
 github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/falcosecurity/driverkit v0.15.5-0.20231108173325-1babd00be84f h1:J18YO8qW1vHbFpue+ga0KS8vjXmF7Wkqd2juqFotcB0=
-github.com/falcosecurity/driverkit v0.15.5-0.20231108173325-1babd00be84f/go.mod h1:vGGEx4jQFuTCYdPn70Pb7d3PjrgBULCKhOlW/serJTw=
+github.com/falcosecurity/driverkit v0.16.0 h1:riTkoDVJjoO00kojzm9rNvXu0aQs3phWp+4+VJjt+Ws=
+github.com/falcosecurity/driverkit v0.16.0/go.mod h1:vGGEx4jQFuTCYdPn70Pb7d3PjrgBULCKhOlW/serJTw=
 github.com/fasthttp-contrib/websocket v0.0.0-20160511215533-1f3b11f56072/go.mod h1:duJ4Jxv5lDcvg4QuQr0oowTf7dz4/CR8NtyCooz9HL8=
 github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
 github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=

pkg/driver/type/bpf.go

@@ -24,6 +24,7 @@ import (
 	"golang.org/x/net/context"
 	"k8s.io/utils/mount"
 
+	"github.com/falcosecurity/falcoctl/internal/utils"
 	"github.com/falcosecurity/falcoctl/pkg/output"
 )
 
@@ -45,9 +46,17 @@ func (b *bpf) Cleanup(printer *output.Printer, _ string) error {
 	// since these releases still did not support raw tracepoints.
 	// BPF_PROG_TYPE_RAW_TRACEPOINT was introduced in 4.17 indeed:
 	// https://github.com/torvalds/linux/commit/c4f6699dfcb8558d138fe838f741b2c10f416cf9
+	exists, _ := utils.FileExists("/sys/kernel/debug/tracing")
+	if exists {
+		return nil
+	}
 	printer.Logger.Info("Mounting debugfs for bpf driver.")
 	mounter := mount.New("/bin/mount")
-	return mounter.Mount("debugfs", "/sys/kernel/debug", "debugfs", []string{"nodev"})
+	// We don't fail if this fails; let's try to build a probe anyway.
+	if err := mounter.Mount("debugfs", "/sys/kernel/debug", "debugfs", []string{"nodev"}); err != nil {
+		printer.Logger.Warn("Failed to mount debugfs.", printer.Logger.Args("err", err))
+	}
+	return nil
 }
 
 func (b *bpf) Load(_ *output.Printer, _ string, _ bool) error {