bpf: Add tests for eBPF file mode

Two related tests are added into bpf selftest to test read only map and
write only map. The tests verified the read only and write only flags
are working on hash maps.

Signed-off-by: Chenbo Feng <fengc@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index fe3a443a110228efb99bc893d2f0820cd03e6763..896f23cfe9185c0eb35f8d7262a7d95e55cd963c 100644 (file)
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -1033,6 +1033,51 @@ static void test_map_parallel(void)
        assert(bpf_map_get_next_key(fd, &key, &key) == -1 && errno == ENOENT);
 }
 
+static void test_map_rdonly(void)
+{
+       int i, fd, key = 0, value = 0;
+
+       fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
+                           MAP_SIZE, map_flags | BPF_F_RDONLY);
+       if (fd < 0) {
+               printf("Failed to create map for read only test '%s'!\n",
+                      strerror(errno));
+               exit(1);
+       }
+
+       key = 1;
+       value = 1234;
+       /* Insert key=1 element. */
+       assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == -1 &&
+              errno == EPERM);
+
+       /* Check that key=2 is not found. */
+       assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);
+       assert(bpf_map_get_next_key(fd, &key, &value) == -1 && errno == ENOENT);
+}
+
+static void test_map_wronly(void)
+{
+       int i, fd, key = 0, value = 0;
+
+       fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
+                           MAP_SIZE, map_flags | BPF_F_WRONLY);
+       if (fd < 0) {
+               printf("Failed to create map for read only test '%s'!\n",
+                      strerror(errno));
+               exit(1);
+       }
+
+       key = 1;
+       value = 1234;
+       /* Insert key=1 element. */
+       assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0)
+
+       /* Check that key=2 is not found. */
+       assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == EPERM);
+       assert(bpf_map_get_next_key(fd, &key, &value) == -1 && errno == EPERM);
+}
+
 static void run_all_tests(void)
 {
        test_hashmap(0, NULL);
@@ -1050,6 +1095,9 @@ static void run_all_tests(void)
        test_map_large();
        test_map_parallel();
        test_map_stress();
+
+       test_map_rdonly();
+       test_map_wronly();
 }
 
 int main(void)