selftests/bpf: Add tests for get_func_[arg|ret|arg_cnt] helpers
Adding tests for get_func_[arg|ret|arg_cnt] helpers. Using these helpers in fentry/fexit/fmod_ret programs. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211208193245.172141-6-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
Alexei Starovoitov
parent
f92c1e1836
commit
006004b715
44
tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
Normal file
44
tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
Normal file
@ -0,0 +1,44 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
#include <test_progs.h>
|
||||
#include "get_func_args_test.skel.h"
|
||||
|
||||
void test_get_func_args_test(void)
|
||||
{
|
||||
struct get_func_args_test *skel = NULL;
|
||||
__u32 duration = 0, retval;
|
||||
int err, prog_fd;
|
||||
|
||||
skel = get_func_args_test__open_and_load();
|
||||
if (!ASSERT_OK_PTR(skel, "get_func_args_test__open_and_load"))
|
||||
return;
|
||||
|
||||
err = get_func_args_test__attach(skel);
|
||||
if (!ASSERT_OK(err, "get_func_args_test__attach"))
|
||||
goto cleanup;
|
||||
|
||||
/* This runs bpf_fentry_test* functions and triggers
|
||||
* fentry/fexit programs.
|
||||
*/
|
||||
prog_fd = bpf_program__fd(skel->progs.test1);
|
||||
err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
|
||||
NULL, NULL, &retval, &duration);
|
||||
ASSERT_OK(err, "test_run");
|
||||
ASSERT_EQ(retval, 0, "test_run");
|
||||
|
||||
/* This runs bpf_modify_return_test function and triggers
|
||||
* fmod_ret_test and fexit_test programs.
|
||||
*/
|
||||
prog_fd = bpf_program__fd(skel->progs.fmod_ret_test);
|
||||
err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
|
||||
NULL, NULL, &retval, &duration);
|
||||
ASSERT_OK(err, "test_run");
|
||||
ASSERT_EQ(retval, 1234, "test_run");
|
||||
|
||||
ASSERT_EQ(skel->bss->test1_result, 1, "test1_result");
|
||||
ASSERT_EQ(skel->bss->test2_result, 1, "test2_result");
|
||||
ASSERT_EQ(skel->bss->test3_result, 1, "test3_result");
|
||||
ASSERT_EQ(skel->bss->test4_result, 1, "test4_result");
|
||||
|
||||
cleanup:
|
||||
get_func_args_test__destroy(skel);
|
||||
}
|
||||
123
tools/testing/selftests/bpf/progs/get_func_args_test.c
Normal file
123
tools/testing/selftests/bpf/progs/get_func_args_test.c
Normal file
@ -0,0 +1,123 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
#include <linux/bpf.h>
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include <errno.h>
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
||||
__u64 test1_result = 0;
|
||||
SEC("fentry/bpf_fentry_test1")
|
||||
int BPF_PROG(test1)
|
||||
{
|
||||
__u64 cnt = bpf_get_func_arg_cnt(ctx);
|
||||
__u64 a = 0, z = 0, ret = 0;
|
||||
__s64 err;
|
||||
|
||||
test1_result = cnt == 1;
|
||||
|
||||
/* valid arguments */
|
||||
err = bpf_get_func_arg(ctx, 0, &a);
|
||||
|
||||
/* We need to cast access to traced function argument values with
|
||||
* proper type cast, because trampoline uses type specific instruction
|
||||
* to save it, like for 'int a' with 32-bit mov like:
|
||||
*
|
||||
* mov %edi,-0x8(%rbp)
|
||||
*
|
||||
* so the upper 4 bytes are not zeroed.
|
||||
*/
|
||||
test1_result &= err == 0 && ((int) a == 1);
|
||||
|
||||
/* not valid argument */
|
||||
err = bpf_get_func_arg(ctx, 1, &z);
|
||||
test1_result &= err == -EINVAL;
|
||||
|
||||
/* return value fails in fentry */
|
||||
err = bpf_get_func_ret(ctx, &ret);
|
||||
test1_result &= err == -EOPNOTSUPP;
|
||||
return 0;
|
||||
}
|
||||
|
||||
__u64 test2_result = 0;
|
||||
SEC("fexit/bpf_fentry_test2")
|
||||
int BPF_PROG(test2)
|
||||
{
|
||||
__u64 cnt = bpf_get_func_arg_cnt(ctx);
|
||||
__u64 a = 0, b = 0, z = 0, ret = 0;
|
||||
__s64 err;
|
||||
|
||||
test2_result = cnt == 2;
|
||||
|
||||
/* valid arguments */
|
||||
err = bpf_get_func_arg(ctx, 0, &a);
|
||||
test2_result &= err == 0 && (int) a == 2;
|
||||
|
||||
err = bpf_get_func_arg(ctx, 1, &b);
|
||||
test2_result &= err == 0 && b == 3;
|
||||
|
||||
/* not valid argument */
|
||||
err = bpf_get_func_arg(ctx, 2, &z);
|
||||
test2_result &= err == -EINVAL;
|
||||
|
||||
/* return value */
|
||||
err = bpf_get_func_ret(ctx, &ret);
|
||||
test2_result &= err == 0 && ret == 5;
|
||||
return 0;
|
||||
}
|
||||
|
||||
__u64 test3_result = 0;
|
||||
SEC("fmod_ret/bpf_modify_return_test")
|
||||
int BPF_PROG(fmod_ret_test, int _a, int *_b, int _ret)
|
||||
{
|
||||
__u64 cnt = bpf_get_func_arg_cnt(ctx);
|
||||
__u64 a = 0, b = 0, z = 0, ret = 0;
|
||||
__s64 err;
|
||||
|
||||
test3_result = cnt == 2;
|
||||
|
||||
/* valid arguments */
|
||||
err = bpf_get_func_arg(ctx, 0, &a);
|
||||
test3_result &= err == 0 && ((int) a == 1);
|
||||
|
||||
err = bpf_get_func_arg(ctx, 1, &b);
|
||||
test3_result &= err == 0 && ((int *) b == _b);
|
||||
|
||||
/* not valid argument */
|
||||
err = bpf_get_func_arg(ctx, 2, &z);
|
||||
test3_result &= err == -EINVAL;
|
||||
|
||||
/* return value */
|
||||
err = bpf_get_func_ret(ctx, &ret);
|
||||
test3_result &= err == 0 && ret == 0;
|
||||
|
||||
/* change return value, it's checked in fexit_test program */
|
||||
return 1234;
|
||||
}
|
||||
|
||||
__u64 test4_result = 0;
|
||||
SEC("fexit/bpf_modify_return_test")
|
||||
int BPF_PROG(fexit_test, int _a, int *_b, int _ret)
|
||||
{
|
||||
__u64 cnt = bpf_get_func_arg_cnt(ctx);
|
||||
__u64 a = 0, b = 0, z = 0, ret = 0;
|
||||
__s64 err;
|
||||
|
||||
test4_result = cnt == 2;
|
||||
|
||||
/* valid arguments */
|
||||
err = bpf_get_func_arg(ctx, 0, &a);
|
||||
test4_result &= err == 0 && ((int) a == 1);
|
||||
|
||||
err = bpf_get_func_arg(ctx, 1, &b);
|
||||
test4_result &= err == 0 && ((int *) b == _b);
|
||||
|
||||
/* not valid argument */
|
||||
err = bpf_get_func_arg(ctx, 2, &z);
|
||||
test4_result &= err == -EINVAL;
|
||||
|
||||
/* return value */
|
||||
err = bpf_get_func_ret(ctx, &ret);
|
||||
test4_result &= err == 0 && ret == 1234;
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user