Enable lmbench-write&lmbench-read in benchmark ci

.github/workflows/benchmark_asterinas.yml

@@ -32,13 +32,8 @@ jobs:
           - lmbench-fstat
           - lmbench-open
           - lmbench-stat
-          # TODO: The following benchmarks are disabled now for some reasons.
-          #
-          # In Linux, lack of /dev/null device
-          # - lmbench-write
-          # In Linux, lack of /dev/zero device
-          # - lmbench-read
-          #
+          - lmbench-write
+          - lmbench-read
           # Signal-related benchmarks
           - lmbench-signal
       fail-fast: false

test/benchmark/bench_linux_and_aster.sh

@@ -21,6 +21,7 @@ generate_entrypoint_script() {
     local benchmark="$1"
     local init_script=$(cat <<EOF
 #!/bin/sh
+mount -t devtmpfs devtmpfs /dev
 
 echo "Running ${benchmark}"
 chmod +x /benchmark/${benchmark}/run.sh