From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>
Subject: [PATCHv3 bpf-next 15/26] libbpf: Add uprobe multi link detection
Date: Fri, 30 Jun 2023 10:33:33 +0200 [thread overview]
Message-ID: <20230630083344.984305-16-jolsa@kernel.org> (raw)
In-Reply-To: <20230630083344.984305-1-jolsa@kernel.org>
Adding uprobe-multi link detection. It will be used later in
bpf_program__attach_usdt function to check and use uprobe_multi
link over standard uprobe links.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/lib/bpf/libbpf.c | 35 +++++++++++++++++++++++++++++++++
tools/lib/bpf/libbpf_internal.h | 2 ++
2 files changed, 37 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 06092b9752f1..4f61f9dc1748 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4817,6 +4817,38 @@ static int probe_perf_link(void)
return link_fd < 0 && err == -EBADF;
}
+static int probe_uprobe_multi_link(void)
+{
+ LIBBPF_OPTS(bpf_prog_load_opts, load_opts,
+ .expected_attach_type = BPF_TRACE_UPROBE_MULTI,
+ );
+ LIBBPF_OPTS(bpf_link_create_opts, link_opts);
+ struct bpf_insn insns[] = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ };
+ unsigned long offset = 0;
+ int prog_fd, link_fd;
+
+ prog_fd = bpf_prog_load(BPF_PROG_TYPE_KPROBE, NULL, "GPL",
+ insns, ARRAY_SIZE(insns), &load_opts);
+ if (prog_fd < 0)
+ return -errno;
+
+ /* create single uprobe on offset 0 in current process */
+ link_opts.uprobe_multi.path = "/proc/self/exe";
+ link_opts.uprobe_multi.offsets = &offset;
+ link_opts.uprobe_multi.cnt = 1;
+
+ link_fd = bpf_link_create(prog_fd, -1, BPF_TRACE_UPROBE_MULTI, &link_opts);
+
+ if (link_fd >= 0)
+ close(link_fd);
+ close(prog_fd);
+
+ return link_fd >= 0;
+}
+
static int probe_kern_bpf_cookie(void)
{
struct bpf_insn insns[] = {
@@ -4913,6 +4945,9 @@ static struct kern_feature_desc {
[FEAT_SYSCALL_WRAPPER] = {
"Kernel using syscall wrapper", probe_kern_syscall_wrapper,
},
+ [FEAT_UPROBE_MULTI_LINK] = {
+ "BPF uprobe multi link support", probe_uprobe_multi_link,
+ },
};
bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 7d75b92e531a..9c04b3fe1207 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -354,6 +354,8 @@ enum kern_feature_id {
FEAT_BTF_ENUM64,
/* Kernel uses syscall wrapper (CONFIG_ARCH_HAS_SYSCALL_WRAPPER) */
FEAT_SYSCALL_WRAPPER,
+ /* BPF uprobe_multi link support */
+ FEAT_UPROBE_MULTI_LINK,
__FEAT_CNT,
};
--
2.41.0
next prev parent reply other threads:[~2023-06-30 8:36 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-30 8:33 [PATCHv3 bpf-next 00/26] bpf: Add multi uprobe link Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 01/26] bpf: Add attach_type checks under bpf_prog_attach_check_attach_type Jiri Olsa
2023-07-06 22:34 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 02/26] bpf: Add multi uprobe link Jiri Olsa
2023-07-06 22:34 ` Andrii Nakryiko
2023-07-11 9:00 ` Jiri Olsa
2023-07-07 4:22 ` Andrii Nakryiko
2023-07-11 9:01 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 03/26] bpf: Add cookies support for uprobe_multi link Jiri Olsa
2023-07-01 3:40 ` Yafang Shao
2023-07-01 8:54 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 04/26] bpf: Add pid filter " Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 05/26] bpf: Add bpf_get_func_ip helper support for uprobe link Jiri Olsa
2023-07-06 22:29 ` Andrii Nakryiko
2023-07-10 7:24 ` Jiri Olsa
2023-07-10 17:55 ` Andrii Nakryiko
2023-07-11 8:28 ` Jiri Olsa
2023-07-11 16:57 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 06/26] libbpf: Add uprobe_multi attach type and link names Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 07/26] libbpf: Move elf_find_func_offset* functions to elf object Jiri Olsa
2023-07-06 23:02 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-07-11 17:01 ` Andrii Nakryiko
2023-07-06 23:03 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 08/26] libbpf: Add elf_open/elf_close functions Jiri Olsa
2023-07-06 23:09 ` Andrii Nakryiko
2023-07-11 9:01 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 09/26] libbpf: Add elf symbol iterator Jiri Olsa
2023-07-06 23:24 ` Andrii Nakryiko
2023-07-11 9:03 ` Jiri Olsa
2023-07-11 16:59 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 10/26] libbpf: Add elf_resolve_syms_offsets function Jiri Olsa
2023-07-07 3:48 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 11/26] libbpf: Add elf_resolve_pattern_offsets function Jiri Olsa
2023-07-07 3:52 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 12/26] libbpf: Add bpf_link_create support for multi uprobes Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 13/26] libbpf: Add bpf_program__attach_uprobe_multi function Jiri Olsa
2023-07-07 4:05 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-07-11 17:02 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 14/26] libbpf: Add support for u[ret]probe.multi[.s] program sections Jiri Olsa
2023-07-07 4:07 ` Andrii Nakryiko
2023-06-30 8:33 ` Jiri Olsa [this message]
2023-07-07 4:20 ` [PATCHv3 bpf-next 15/26] libbpf: Add uprobe multi link detection Andrii Nakryiko
2023-07-11 9:03 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 16/26] libbpf: Add uprobe multi link support to bpf_program__attach_usdt Jiri Olsa
2023-07-07 4:29 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 17/26] selftests/bpf: Add uprobe_multi skel test Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 18/26] selftests/bpf: Add uprobe_multi api test Jiri Olsa
2023-07-07 4:32 ` Andrii Nakryiko
2023-07-11 9:06 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 19/26] selftests/bpf: Add uprobe_multi link test Jiri Olsa
2023-07-07 4:33 ` Andrii Nakryiko
2023-07-11 9:06 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 20/26] selftests/bpf: Add uprobe_multi test program Jiri Olsa
2023-07-07 4:35 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 21/26] selftests/bpf: Add uprobe_multi bench test Jiri Olsa
2023-07-07 4:38 ` Andrii Nakryiko
2023-07-11 9:07 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 22/26] selftests/bpf: Add usdt_multi test program Jiri Olsa
2023-07-07 4:39 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 23/26] selftests/bpf: Add usdt_multi bench test Jiri Olsa
2023-07-07 4:42 ` Andrii Nakryiko
2023-07-11 9:07 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 24/26] selftests/bpf: Add uprobe_multi cookie test Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 25/26] selftests/bpf: Add uprobe_multi pid filter tests Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 26/26] selftests/bpf: Add extra link to uprobe_multi tests Jiri Olsa
2023-07-05 12:45 ` [PATCHv3 bpf-next 00/26] bpf: Add multi uprobe link Daniel Borkmann
2023-07-05 19:10 ` Jiri Olsa
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