linux-kernel - [PATCH 4/8] tracing: probe-events: Log errro for exceeding the number of arguments

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Message-ID:  <174055075075.4079315.10916648136898316476.stgit@mhiramat.tok.corp.google.com>
Date: Wed, 26 Feb 2025 15:19:10 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Shuah Khan <shuah@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Hari Bathini <hbathini@...ux.ibm.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 4/8] tracing: probe-events: Log errro for exceeding the number of arguments

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Add error message when the number of arguments exceeeds the limitation.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 kernel/trace/trace_eprobe.c |    2 ++
 kernel/trace/trace_fprobe.c |    5 ++++-
 kernel/trace/trace_kprobe.c |    5 ++++-
 kernel/trace/trace_probe.h  |    1 +
 kernel/trace/trace_uprobe.c |    9 +++++++--
 5 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index 82fd637cfc19..af9fa0632b57 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -913,6 +913,8 @@ static int __trace_eprobe_create(int argc, const char *argv[])
 	}
 
 	if (argc - 2 > MAX_TRACE_ARGS) {
+		trace_probe_log_set_index(2);
+		trace_probe_log_err(0, TOO_MANY_ARGS);
 		ret = -E2BIG;
 		goto error;
 	}
diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index e27305d31fc5..372936163c21 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -1201,8 +1201,11 @@ static int trace_fprobe_create_internal(int argc, const char *argv[],
 		argc = new_argc;
 		argv = new_argv;
 	}
-	if (argc > MAX_TRACE_ARGS)
+	if (argc > MAX_TRACE_ARGS) {
+		trace_probe_log_set_index(2);
+		trace_probe_log_err(0, TOO_MANY_ARGS);
 		return -E2BIG;
+	}
 
 	ret = traceprobe_expand_dentry_args(argc, argv, &dbuf);
 	if (ret)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index d8d5f18a141a..8287b175667f 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1007,8 +1007,11 @@ static int trace_kprobe_create_internal(int argc, const char *argv[],
 		argc = new_argc;
 		argv = new_argv;
 	}
-	if (argc > MAX_TRACE_ARGS)
+	if (argc > MAX_TRACE_ARGS) {
+		trace_probe_log_set_index(2);
+		trace_probe_log_err(0, TOO_MANY_ARGS);
 		return -E2BIG;
+	}
 
 	ret = traceprobe_expand_dentry_args(argc, argv, &dbuf);
 	if (ret)
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index c47ca002347a..6075afc8ea67 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -546,6 +546,7 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
 	C(BAD_BTF_TID,		"Failed to get BTF type info."),\
 	C(BAD_TYPE4STR,		"This type does not fit for string."),\
 	C(NEED_STRING_TYPE,	"$comm and immediate-string only accepts string type"),\
+	C(TOO_MANY_ARGS,	"Too many arguments are specified"),	\
 	C(TOO_MANY_EARGS,	"Too many entry arguments specified"),
 
 #undef C
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index ccc762fbb69c..3386439ec9f6 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -562,8 +562,14 @@ static int __trace_uprobe_create(int argc, const char **argv)
 
 	if (argc < 2)
 		return -ECANCELED;
-	if (argc - 2 > MAX_TRACE_ARGS)
+
+	trace_probe_log_init("trace_uprobe", argc, argv);
+
+	if (argc - 2 > MAX_TRACE_ARGS) {
+		trace_probe_log_set_index(2);
+		trace_probe_log_err(0, TOO_MANY_ARGS);
 		return -E2BIG;
+	}
 
 	if (argv[0][1] == ':')
 		event = &argv[0][2];
@@ -582,7 +588,6 @@ static int __trace_uprobe_create(int argc, const char **argv)
 		return -ECANCELED;
 	}
 
-	trace_probe_log_init("trace_uprobe", argc, argv);
 	trace_probe_log_set_index(1);	/* filename is the 2nd argument */
 
 	*arg++ = '\0';