diff mbox series

[bpf-next,v3,07/15] selftests/bpf: test autocreate behavior for struct_ops maps

Message ID 20240304225156.24765-8-eddyz87@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series libbpf: type suffixes and autocreate flag for struct_ops maps | expand

Checks

Context Check Description
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bpf/vmtest-bpf-next-VM_Test-13 fail Logs for s390x-gcc / test (test_maps, false, 360) / test_maps on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-14 fail Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc
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Commit Message

Eduard Zingerman March 4, 2024, 10:51 p.m. UTC 
Check that bpf_map__set_autocreate() can be used to disable automatic
creation for struct_ops maps.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 .../bpf/prog_tests/struct_ops_autocreate.c    | 76 +++++++++++++++++++
 .../bpf/progs/struct_ops_autocreate.c         | 42 ++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
 create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_autocreate.c

Comments

Daniel Borkmann March 5, 2024, 9:51 a.m. UTC | #1 
On 3/4/24 11:51 PM, Eduard Zingerman wrote:
> Check that bpf_map__set_autocreate() can be used to disable automatic
> creation for struct_ops maps.
> 
> Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
> ---
>   .../bpf/prog_tests/struct_ops_autocreate.c    | 76 +++++++++++++++++++
>   .../bpf/progs/struct_ops_autocreate.c         | 42 ++++++++++
>   2 files changed, 118 insertions(+)
>   create mode 100644 tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
>   create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_autocreate.c
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
> new file mode 100644
> index 000000000000..883f938d518c
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
> @@ -0,0 +1,76 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <test_progs.h>
> +#include "struct_ops_autocreate.skel.h"
> +
> +static void cant_load_full_object(void)
> +{
> +	struct struct_ops_autocreate *skel;
> +	char *log;
> +	int err;
> +
> +	skel = struct_ops_autocreate__open();
> +	if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open"))
> +		return;
> +
> +	if (start_libbpf_log_capture())
> +		goto cleanup;

nit: This cleanup path triggers freeing of uninitialized log pointer.

> +	/* The testmod_2 map BTF type (struct bpf_testmod_ops___v2) doesn't
> +	 * match the BTF of the actual struct bpf_testmod_ops defined in the
> +	 * kernel, so we should fail to load it if we don't disable autocreate
> +	 * for that map.
> +	 */
> +	err = struct_ops_autocreate__load(skel);
> +	log = stop_libbpf_log_capture();
> +	if (!ASSERT_ERR(err, "struct_ops_autocreate__load"))
> +		goto cleanup;
> +
> +	ASSERT_HAS_SUBSTR(log, "libbpf: struct_ops init_kern", "init_kern message");
> +	ASSERT_EQ(err, -ENOTSUP, "errno should be ENOTSUP");
> +
> +cleanup:
> +	free(log);
> +	struct_ops_autocreate__destroy(skel);
> +}
Eduard Zingerman March 5, 2024, 9:54 a.m. UTC | #2 
On Tue, 2024-03-05 at 10:51 +0100, Daniel Borkmann wrote:
[...]

> > diff --git a/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
> > new file mode 100644
> > index 000000000000..883f938d518c
> > --- /dev/null
> > +++ b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
> > @@ -0,0 +1,76 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#include <test_progs.h>
> > +#include "struct_ops_autocreate.skel.h"
> > +
> > +static void cant_load_full_object(void)
> > +{
> > +	struct struct_ops_autocreate *skel;
> > +	char *log;
> > +	int err;
> > +
> > +	skel = struct_ops_autocreate__open();
> > +	if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open"))
> > +		return;
> > +
> > +	if (start_libbpf_log_capture())
> > +		goto cleanup;
> 
> nit: This cleanup path triggers freeing of uninitialized log pointer.

Thank you for noticing, I will double check all tests and post v4
after collecting some additional feedback.

[...]
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
new file mode 100644
index 000000000000..883f938d518c
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c
@@ -0,0 +1,76 @@ 
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+#include "struct_ops_autocreate.skel.h"
+
+static void cant_load_full_object(void)
+{
+	struct struct_ops_autocreate *skel;
+	char *log;
+	int err;
+
+	skel = struct_ops_autocreate__open();
+	if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open"))
+		return;
+
+	if (start_libbpf_log_capture())
+		goto cleanup;
+	/* The testmod_2 map BTF type (struct bpf_testmod_ops___v2) doesn't
+	 * match the BTF of the actual struct bpf_testmod_ops defined in the
+	 * kernel, so we should fail to load it if we don't disable autocreate
+	 * for that map.
+	 */
+	err = struct_ops_autocreate__load(skel);
+	log = stop_libbpf_log_capture();
+	if (!ASSERT_ERR(err, "struct_ops_autocreate__load"))
+		goto cleanup;
+
+	ASSERT_HAS_SUBSTR(log, "libbpf: struct_ops init_kern", "init_kern message");
+	ASSERT_EQ(err, -ENOTSUP, "errno should be ENOTSUP");
+
+cleanup:
+	free(log);
+	struct_ops_autocreate__destroy(skel);
+}
+
+static void can_load_partial_object(void)
+{
+	struct struct_ops_autocreate *skel;
+	struct bpf_link *link = NULL;
+	int err;
+
+	skel = struct_ops_autocreate__open();
+	if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open_opts"))
+		return;
+
+	err = bpf_program__set_autoload(skel->progs.test_2, false);
+	if (!ASSERT_OK(err, "bpf_program__set_autoload"))
+		goto cleanup;
+
+	err = bpf_map__set_autocreate(skel->maps.testmod_2, false);
+	if (!ASSERT_OK(err, "bpf_map__set_autocreate"))
+		goto cleanup;
+
+	err = struct_ops_autocreate__load(skel);
+	if (ASSERT_OK(err, "struct_ops_autocreate__load"))
+		goto cleanup;
+
+	link = bpf_map__attach_struct_ops(skel->maps.testmod_1);
+	if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops"))
+		goto cleanup;
+
+	/* test_1() would be called from bpf_dummy_reg2() in bpf_testmod.c */
+	ASSERT_EQ(skel->bss->test_1_result, 42, "test_1_result");
+
+cleanup:
+	bpf_link__destroy(link);
+	struct_ops_autocreate__destroy(skel);
+}
+
+void test_struct_ops_autocreate(void)
+{
+	if (test__start_subtest("cant_load_full_object"))
+		cant_load_full_object();
+	if (test__start_subtest("can_load_partial_object"))
+		can_load_partial_object();
+}
diff --git a/tools/testing/selftests/bpf/progs/struct_ops_autocreate.c b/tools/testing/selftests/bpf/progs/struct_ops_autocreate.c
new file mode 100644
index 000000000000..9a951ee6f55c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/struct_ops_autocreate.c
@@ -0,0 +1,42 @@ 
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+int test_1_result = 0;
+
+SEC("struct_ops/test_1")
+int BPF_PROG(test_1)
+{
+	test_1_result = 42;
+	return 0;
+}
+
+SEC("struct_ops/test_1")
+int BPF_PROG(test_2)
+{
+	return 0;
+}
+
+struct bpf_testmod_ops___v1 {
+	int (*test_1)(void);
+};
+
+struct bpf_testmod_ops___v2 {
+	int (*test_1)(void);
+	int (*does_not_exist)(void);
+};
+
+SEC(".struct_ops.link")
+struct bpf_testmod_ops___v1 testmod_1 = {
+	.test_1 = (void *)test_1
+};
+
+SEC(".struct_ops.link")
+struct bpf_testmod_ops___v2 testmod_2 = {
+	.test_1 = (void *)test_1,
+	.does_not_exist = (void *)test_2
+};