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Message-ID: <175283844827.343578.10408845752163723065.stgit@devnote2>
Date: Fri, 18 Jul 2025 20:34:08 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH 1/5] tracing: probe: Allocate traceprobe_parse_context from heap
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Instead of allocating traceprobe_parse_context on stack, allocate it
dynamically from heap (slab).
This change is likely intended to prevent potential stack overflow
issues, which can be a concern in the kernel environment where stack
space is limited.
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506240416.nZIhDXoO-lkp@intel.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
kernel/trace/trace_eprobe.c | 14 ++++++++------
kernel/trace/trace_fprobe.c | 13 ++++++++-----
kernel/trace/trace_kprobe.c | 10 +++++++---
kernel/trace/trace_probe.h | 9 +++++++++
kernel/trace/trace_uprobe.c | 15 +++++++++------
5 files changed, 41 insertions(+), 20 deletions(-)
diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index 916555f0de81..1e18a8619b40 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -797,18 +797,20 @@ find_and_get_event(const char *system, const char *event_name)
static int trace_eprobe_tp_update_arg(struct trace_eprobe *ep, const char *argv[], int i)
{
- struct traceprobe_parse_context ctx = {
- .event = ep->event,
- .flags = TPARG_FL_KERNEL | TPARG_FL_TEVENT,
- };
+ struct traceprobe_parse_context *ctx __free(traceprobe_parse_context) = NULL;
int ret;
- ret = traceprobe_parse_probe_arg(&ep->tp, i, argv[i], &ctx);
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->event = ep->event;
+ ctx->flags = TPARG_FL_KERNEL | TPARG_FL_TEVENT;
+
+ ret = traceprobe_parse_probe_arg(&ep->tp, i, argv[i], ctx);
/* Handle symbols "@" */
if (!ret)
ret = traceprobe_update_arg(&ep->tp.args[i]);
- traceprobe_finish_parse(&ctx);
return ret;
}
diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index dbf9d413125a..264cf7fc9a1d 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -1383,14 +1383,17 @@ static int trace_fprobe_create_internal(int argc, const char *argv[],
static int trace_fprobe_create_cb(int argc, const char *argv[])
{
- struct traceprobe_parse_context ctx = {
- .flags = TPARG_FL_KERNEL | TPARG_FL_FPROBE,
- };
+ struct traceprobe_parse_context *ctx __free(traceprobe_parse_context) = NULL;
int ret;
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->flags = TPARG_FL_KERNEL | TPARG_FL_FPROBE,
+
trace_probe_log_init("trace_fprobe", argc, argv);
- ret = trace_fprobe_create_internal(argc, argv, &ctx);
- traceprobe_finish_parse(&ctx);
+ ret = trace_fprobe_create_internal(argc, argv, ctx);
trace_probe_log_clear();
return ret;
}
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 3e5c47b6d7b2..15d7a381a128 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1065,14 +1065,18 @@ static int trace_kprobe_create_internal(int argc, const char *argv[],
static int trace_kprobe_create_cb(int argc, const char *argv[])
{
- struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL };
+ struct traceprobe_parse_context *ctx __free(traceprobe_parse_context) = NULL;
int ret;
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->flags = TPARG_FL_KERNEL;
+
trace_probe_log_init("trace_kprobe", argc, argv);
- ret = trace_kprobe_create_internal(argc, argv, &ctx);
+ ret = trace_kprobe_create_internal(argc, argv, ctx);
- traceprobe_finish_parse(&ctx);
trace_probe_log_clear();
return ret;
}
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 854e5668f5ee..7bc4c84464e4 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -10,6 +10,7 @@
* Author: Srikar Dronamraju
*/
+#include <linux/cleanup.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
@@ -438,6 +439,14 @@ extern void traceprobe_free_probe_arg(struct probe_arg *arg);
* this MUST be called for clean up the context and return a resource.
*/
void traceprobe_finish_parse(struct traceprobe_parse_context *ctx);
+static inline void traceprobe_free_parse_ctx(struct traceprobe_parse_context *ctx)
+{
+ traceprobe_finish_parse(ctx);
+ kfree(ctx);
+}
+
+DEFINE_FREE(traceprobe_parse_context, struct traceprobe_parse_context *,
+ if (!IS_ERR_OR_NULL(_T)) traceprobe_free_parse_ctx(_T))
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index f95a2c3d5b1b..1fd479718d03 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -537,6 +537,7 @@ static int register_trace_uprobe(struct trace_uprobe *tu)
*/
static int __trace_uprobe_create(int argc, const char **argv)
{
+ struct traceprobe_parse_context *ctx __free(traceprobe_parse_context) = NULL;
struct trace_uprobe *tu;
const char *event = NULL, *group = UPROBE_EVENT_SYSTEM;
char *arg, *filename, *rctr, *rctr_end, *tmp;
@@ -693,15 +694,17 @@ static int __trace_uprobe_create(int argc, const char **argv)
tu->path = path;
tu->filename = filename;
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ ctx->flags = (is_return ? TPARG_FL_RETURN : 0) | TPARG_FL_USER;
+
/* parse arguments */
for (i = 0; i < argc; i++) {
- struct traceprobe_parse_context ctx = {
- .flags = (is_return ? TPARG_FL_RETURN : 0) | TPARG_FL_USER,
- };
-
trace_probe_log_set_index(i + 2);
- ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i], &ctx);
- traceprobe_finish_parse(&ctx);
+ ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i], ctx);
if (ret)
goto error;
}
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