update logo

README.md

@@ -2,8 +2,6 @@
 
 # 📦 Wasm-bpf: Wasm library and toolchain for eBPF
 
-![logo](test/asserts/logo.png)
-
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examples/lsm/Makefile

@@ -1,6 +1,7 @@
 .PHONY: all
 
 ARCH ?= $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
+TINYGO ?= $(shell which tinygo)
 VMLINUX := ../../third_party/vmlinux/$(ARCH)/vmlinux.h
 BPF_HEADERS := ../../third_party/
 # Use our own libbpf API headers and Linux UAPI headers distributed with
@@ -34,6 +35,7 @@ all: $(APP).wasm $(APP).bpf.o
 .PHONY: clean
 clean:
 	rm -rf *.o *.json *.wasm *.skel.h
+	cd go_wasm/ && rm -rf *.o *.json *.wasm *.skel.h
 
 # Build BPF code
 %.bpf.o: %.bpf.c $(wildcard %.h) $(VMLINUX)
@@ -60,6 +62,11 @@ WASI_CFLAGS = -O2 --sysroot=/opt/wasi-sdk/share/wasi-sysroot -Wl,--allow-undefin
 $(APP).wasm: $(APP).c $(APP).skel.h
 	$(WASI_CLANG) $(WASI_CFLAGS) -o $@ $< 
 
+$(APP)_go_wasm: $(APP).bpf.o
+	cp ./$(APP).bpf.o go-lsm 
+	cd go-lsm && $(TINYGO) build -target wasi -o $(APP).go.wasm  main.go
+
+
 TEST_TIME := 3
 .PHONY: test
 test:

examples/lsm/README.md

@@ -18,3 +18,8 @@ CONFIG_DEBUG_INFO_BTF=y
 CONFIG_BPF_LSM=y
 CONFIG_LSM="[other LSMs],bpf"
 ```
+
+go wasm example(need tinygo):
+```sh
+make lsm_go_wasm # will output to go_wasm/lsm.go.wasm
+```

examples/lsm/go-lsm/go.mod

@@ -0,0 +1,3 @@
+module go_wasm
+
+go 1.18

examples/lsm/go-lsm/helper/helper.go

@@ -0,0 +1,8 @@
+// export
+package helper
+
+//export wasm_load_bpf_object
+func WasmLoadBpfObject(int32, int32) int64
+
+//export wasm_attach_bpf_program
+func WasmAttachBpfProgram(int64, int32, int32) int32

examples/lsm/go-lsm/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"bytes"
+	_ "embed"
+	"go_wasm/helper"
+	"time"
+	"unsafe"
+)
+
+type CString struct {
+	s []byte
+}
+
+func (c CString) new(s string) *CString {
+	c.s = bytes.Join([][]byte{[]byte(s), {0}}, nil)
+	return &c
+}
+
+func (c *CString) toWasmPtr() int32 {
+	return int32(uintptr(unsafe.Pointer(&(c.s[0]))))
+
+}
+
+//go:embed lsm.bpf.o
+var obj []byte
+
+func main() {
+	var bpfObj int32 = int32(uintptr(unsafe.Pointer(&obj[0])))
+	objPtr := helper.WasmLoadBpfObject(bpfObj, int32(len(obj)))
+	helper.WasmAttachBpfProgram(objPtr, CString{}.new("path_rmdir").toWasmPtr(), 0)
+	for {
+		time.Sleep(10 * time.Second)
+	}
+
+}

src/wasm-bpf.cpp

@@ -176,6 +176,7 @@ static int attach_cgroup(struct bpf_program *prog, const char *path) {
                path);
         return -1;
     }
+    close(fd);
     return 0;
 }