From: Jiri Olsa <jolsa@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
lkml <linux-kernel@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>,
Steven Rostedt <rostedt@goodmis.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 06/13] samples/kprobes: Add support for multi kprobe interface
Date: Tue, 4 Jan 2022 09:09:36 +0100 [thread overview]
Message-ID: <20220104080943.113249-7-jolsa@kernel.org> (raw)
In-Reply-To: <20220104080943.113249-1-jolsa@kernel.org>
Adding support to test multi kprobe interface. It's now possible
to register multiple functions for the module handler, like:
# modprobe kprobe_example symbol='sched_fork,kernel_clone'
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
samples/kprobes/kprobe_example.c | 47 +++++++++++++++++++++++++++++---
1 file changed, 43 insertions(+), 4 deletions(-)
diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index f991a66b5b02..4ae31184f098 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -15,8 +15,10 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kprobes.h>
+#include <linux/slab.h>
+#include <linux/string.h>
-#define MAX_SYMBOL_LEN 64
+#define MAX_SYMBOL_LEN 4096
static char symbol[MAX_SYMBOL_LEN] = "kernel_clone";
module_param_string(symbol, symbol, sizeof(symbol), 0644);
@@ -97,17 +99,54 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
static int __init kprobe_init(void)
{
+ char **symbols = NULL;
int ret;
+
kp.pre_handler = handler_pre;
kp.post_handler = handler_post;
+#ifdef CONFIG_HAVE_KPROBES_MULTI_ON_FTRACE
+ if (strchr(symbol, ',')) {
+ char *p, *tmp;
+ int cnt;
+
+ tmp = kstrdup(symbol, GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+
+ p = strchr(tmp, ',');
+ while (p) {
+ *p = ' ';
+ p = strchr(p + 1, ',');
+ }
+
+ symbols = argv_split(GFP_KERNEL, tmp, &cnt);
+ kfree(tmp);
+ if (!symbols) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ kp.multi.symbols = (const char **) symbols;
+ kp.multi.cnt = cnt;
+ }
+#endif
+
ret = register_kprobe(&kp);
if (ret < 0) {
pr_err("register_kprobe failed, returned %d\n", ret);
- return ret;
+ goto out;
}
- pr_info("Planted kprobe at %p\n", kp.addr);
- return 0;
+
+ if (symbols)
+ pr_info("Planted multi kprobe to %s\n", symbol);
+ else
+ pr_info("Planted kprobe at %p\n", kp.addr);
+
+out:
+ if (symbols)
+ argv_free(symbols);
+ return ret;
}
static void __exit kprobe_exit(void)
--
2.33.1
next prev parent reply other threads:[~2022-01-04 8:10 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-04 8:09 [RFC 00/13] kprobe/bpf: Add support to attach multiple kprobes Jiri Olsa
2022-01-04 8:09 ` [PATCH 01/13] ftrace: Add ftrace_set_filter_ips function Jiri Olsa
2022-01-04 8:09 ` [PATCH 02/13] kprobe: Keep traced function address Jiri Olsa
2022-01-05 14:32 ` Masami Hiramatsu
2022-01-06 8:30 ` Jiri Olsa
2022-01-06 4:30 ` Andrii Nakryiko
2022-01-06 8:31 ` Jiri Olsa
2022-01-04 8:09 ` [PATCH 03/13] kprobe: Add support to register multiple ftrace kprobes Jiri Olsa
2022-01-05 15:00 ` Masami Hiramatsu
2022-01-04 8:09 ` [PATCH 04/13] kprobe: Add support to register multiple ftrace kretprobes Jiri Olsa
2022-01-04 8:09 ` [PATCH 05/13] kprobe: Allow to get traced function address for multi ftrace kprobes Jiri Olsa
2022-01-06 4:30 ` Andrii Nakryiko
2022-01-04 8:09 ` Jiri Olsa [this message]
2022-01-04 8:09 ` [PATCH 07/13] samples/kprobes: Add support for multi kretprobe interface Jiri Olsa
2022-01-04 8:09 ` [PATCH 08/13] bpf: Add kprobe link for attaching raw kprobes Jiri Olsa
2022-01-06 4:30 ` Andrii Nakryiko
2022-01-06 8:41 ` Jiri Olsa
2022-01-06 16:32 ` Alexei Starovoitov
2022-01-06 21:53 ` Andrii Nakryiko
2022-01-04 8:09 ` [PATCH 09/13] libbpf: Add libbpf__kallsyms_parse function Jiri Olsa
2022-01-04 8:09 ` [PATCH 10/13] libbpf: Add bpf_link_create support for multi kprobes Jiri Olsa
2022-01-04 8:09 ` [PATCH 11/13] libbpf: Add bpf_program__attach_kprobe_opts " Jiri Olsa
2022-01-04 8:09 ` [PATCH 12/13] selftest/bpf: Add raw kprobe attach test Jiri Olsa
2022-01-04 8:09 ` [PATCH 13/13] selftest/bpf: Add bpf_cookie test for raw_k[ret]probe Jiri Olsa
2022-01-04 18:53 ` [RFC 00/13] kprobe/bpf: Add support to attach multiple kprobes Alexei Starovoitov
2022-01-05 9:15 ` Jiri Olsa
2022-01-05 15:24 ` Masami Hiramatsu
2022-01-06 8:29 ` Jiri Olsa
2022-01-06 13:59 ` Masami Hiramatsu
2022-01-06 14:57 ` Jiri Olsa
2022-01-07 5:42 ` Masami Hiramatsu
2022-01-06 15:02 ` Steven Rostedt
2022-01-06 17:40 ` Alexei Starovoitov
2022-01-06 23:52 ` Masami Hiramatsu
2022-01-07 0:20 ` Alexei Starovoitov
2022-01-07 12:55 ` Masami Hiramatsu
2022-01-11 15:00 ` [RFC PATCH 0/6] fprobe: Introduce fprobe function entry/exit probe Masami Hiramatsu
2022-01-11 15:00 ` [RFC PATCH 1/6] fprobe: Add ftrace based probe APIs Masami Hiramatsu
2022-01-11 15:00 ` [RFC PATCH 2/6] rethook: Add a generic return hook Masami Hiramatsu
2022-01-11 15:00 ` [RFC PATCH 3/6] rethook: x86: Add rethook x86 implementation Masami Hiramatsu
2022-01-11 15:01 ` [RFC PATCH 4/6] fprobe: Add exit_handler support Masami Hiramatsu
2022-01-11 15:01 ` [RFC PATCH 5/6] fprobe: Add sample program for fprobe Masami Hiramatsu
2022-01-11 15:01 ` [RFC PATCH 6/6] bpf: Add kprobe link for attaching raw kprobes Masami Hiramatsu
2022-01-11 22:39 ` [RFC PATCH 0/6] fprobe: Introduce fprobe function entry/exit probe Alexei Starovoitov
2022-01-12 7:33 ` Masami Hiramatsu
2022-01-12 11:08 ` Masami Hiramatsu
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