On 07/25, Alexis Lothoré (eBPF Foundation) wrote:
> test_dev_cgroup is defined as a standalone test program, and so is not
> executed in CI.
>
> Convert it to test_progs framework so it is tested automatically in CI, and
> remove the old test. In order to be able to run it in test_progs, /dev/null
> must remain usable, so change the new test to test operations on devices
> 1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid.
>
> Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@xxxxxxxxxxx>
> ---
> tools/testing/selftests/bpf/.gitignore | 1 -
> tools/testing/selftests/bpf/Makefile | 2 -
> .../testing/selftests/bpf/prog_tests/cgroup_dev.c | 120 +++++++++++++++++++++
> tools/testing/selftests/bpf/test_dev_cgroup.c | 85 ---------------
> 4 files changed, 120 insertions(+), 88 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> index 4e4aae8aa7ec..8f14d8faeb0b 100644
> --- a/tools/testing/selftests/bpf/.gitignore
> +++ b/tools/testing/selftests/bpf/.gitignore
> @@ -9,7 +9,6 @@ test_lpm_map
> test_tag
> FEATURE-DUMP.libbpf
> fixdep
> -test_dev_cgroup
> /test_progs
> /test_progs-no_alu32
> /test_progs-bpf_gcc
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index aeada478e37a..2a9ba2246f80 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -69,7 +69,6 @@ endif
>
> # Order correspond to 'make run_tests' order
> TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
> - test_dev_cgroup \
> test_sock test_sockmap get_cgroup_id_user \
> test_cgroup_storage \
> test_tcpnotify_user test_sysctl \
> @@ -295,7 +294,6 @@ JSON_WRITER := $(OUTPUT)/json_writer.o
> CAP_HELPERS := $(OUTPUT)/cap_helpers.o
> NETWORK_HELPERS := $(OUTPUT)/network_helpers.o
>
> -$(OUTPUT)/test_dev_cgroup: $(CGROUP_HELPERS) $(TESTING_HELPERS)
> $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS)
> $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS)
> $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS)
> diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c
> new file mode 100644
> index 000000000000..5112b99213ad
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c
> @@ -0,0 +1,120 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <sys/stat.h>
> +#include <sys/sysmacros.h>
> +#include "test_progs.h"
> +#include "cgroup_helpers.h"
> +#include "dev_cgroup.skel.h"
> +
> +#define TEST_CGROUP "/test-bpf-based-device-cgroup/"
> +#define TEST_BUFFER_SIZE 64
> +
> +static void test_mknod(const char *path, mode_t mode, int dev_major,
> + int dev_minor, int should_fail)
> +{
> + int ret;
> +
> + unlink(path);
> + ret = mknod(path, mode, makedev(dev_major, dev_minor));
[..]
> + if (should_fail)
> + ASSERT_ERR(ret, "mknod");
> + else
> + ASSERT_OK(ret, "mknod");
Optional: might be easier to use something like expected_ret instead
of should_fail and then do:
ASSERT_EQ(ret, expected_ret)
I see this part being copy-pasted in a bunch of places below.
> + unlink(path);
> +}
> +
> +static void test_read(const char *path, int should_fail)
> +{
> + char buf[TEST_BUFFER_SIZE];
> + int ret, fd;
> +
> + fd = open(path, O_RDONLY);
> +
> + /* A bare open on unauthorized device should fail */
> + if (should_fail) {
> + ASSERT_ERR(fd, "open file for read");
[..]
> + if (fd)
> + close(fd);
nit: should this be 'if (fd >= 0)'? I'm assuming the intention is to
avoid close(-1)?
> + return;
> + }
> +
> + if (!ASSERT_OK_FD(fd, "open file for read"))
> + return;
> +
> + ret = read(fd, buf, TEST_BUFFER_SIZE);
> + if (should_fail)
> + ASSERT_ERR(ret, "read");
> + else
> + ASSERT_EQ(ret, TEST_BUFFER_SIZE, "read");
> +
> + close(fd);
> +}
> +
> +static void test_write(const char *path, int should_fail)
> +{
> + char buf[] = "some random test data";
> + int ret, fd;
> +
> + fd = open(path, O_WRONLY);
> +
> + /* A bare open on unauthorized device should fail */
> + if (should_fail) {
> + ASSERT_ERR(fd, "open file for write");
> + if (fd)
> + close(fd);
Same 'if (fd >= 0)'
