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selftests/bpf: Add more uprobe multi fail tests

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We fail to create uprobe if we pass negative offset. Add more tests
validating kernel-side error checking code.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20231217215538.3361991-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-12-17 22:55:38 +01:00 committed by Andrii Nakryiko
parent 3983c00281
commit f17d1a18a3
1 changed files with 146 additions and 3 deletions
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149
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
View file

@ -239,23 +239,166 @@ static void test_attach_api_fails(void)
LIBBPF_OPTS(bpf_link_create_opts, opts);
const char *path = "/proc/self/exe";
struct uprobe_multi *skel = NULL;
int prog_fd, link_fd = -1;
unsigned long offset = 0;
int link_fd = -1;
skel = uprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "uprobe_multi__open_and_load"))
goto cleanup;
prog_fd = bpf_program__fd(skel->progs.uprobe_extra);
/* abnormal cnt */
opts.uprobe_multi.path = path;
opts.uprobe_multi.offsets = &offset;
opts.uprobe_multi.cnt = INT_MAX;
link_fd = bpf_link_create(bpf_program__fd(skel->progs.uprobe), 0,
BPF_TRACE_UPROBE_MULTI, &opts);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -E2BIG, "big cnt"))
goto cleanup;
/* cnt is 0 */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.offsets = (unsigned long *) &offset,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EINVAL, "cnt_is_zero"))
goto cleanup;
/* negative offset */
offset = -1;
opts.uprobe_multi.path = path;
opts.uprobe_multi.offsets = (unsigned long *) &offset;
opts.uprobe_multi.cnt = 1;
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EINVAL, "offset_is_negative"))
goto cleanup;
/* offsets is NULL */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EINVAL, "offsets_is_null"))
goto cleanup;
/* wrong offsets pointer */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.offsets = (unsigned long *) 1,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EFAULT, "offsets_is_wrong"))
goto cleanup;
/* path is NULL */
offset = 1;
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EINVAL, "path_is_null"))
goto cleanup;
/* wrong path pointer */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = (const char *) 1,
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EFAULT, "path_is_wrong"))
goto cleanup;
/* wrong path type */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = "/",
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EBADF, "path_is_wrong_type"))
goto cleanup;
/* wrong cookies pointer */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cookies = (__u64 *) 1ULL,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EFAULT, "cookies_is_wrong"))
goto cleanup;
/* wrong ref_ctr_offsets pointer */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cookies = (__u64 *) &offset,
.uprobe_multi.ref_ctr_offsets = (unsigned long *) 1,
.uprobe_multi.cnt = 1,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EFAULT, "ref_ctr_offsets_is_wrong"))
goto cleanup;
/* wrong flags */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.flags = 1 << 31,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
if (!ASSERT_EQ(link_fd, -EINVAL, "wrong_flags"))
goto cleanup;
/* wrong pid */
LIBBPF_OPTS_RESET(opts,
.uprobe_multi.path = path,
.uprobe_multi.offsets = (unsigned long *) &offset,
.uprobe_multi.cnt = 1,
.uprobe_multi.pid = -2,
);
link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &opts);
if (!ASSERT_ERR(link_fd, "link_fd"))
goto cleanup;
ASSERT_EQ(link_fd, -ESRCH, "pid_is_wrong");
cleanup:
if (link_fd >= 0)
close(link_fd);