[PATCH 4/8] tracing: probe-events: Log errro for exceeding the number of arguments
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2025-02-26 06:19:13
Also in:
linux-kselftest, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: Masami Hiramatsu (Google) <mhiramat@kernel.org> Add error message when the number of arguments exceeeds the limitation. Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.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';