Add a sample program for the fprobe. The sample_fprobe puts a fprobe on
kernel_clone() by default. This dump stack and some called address info
at the function entry and exit.
The sample_fprobe.ko gets 2 parameters.
- symbol: you can specify the comma separated symbols or wildcard symbol
pattern (in this case you can not use comma)
- stackdump: a bool value to enable or disable stack dump in the fprobe
handler.
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
Changes in v6:
- Dump stack on the handler as explained in the comment.
- Add "stackdump" option to enable/disable stackdump.
- Support wildcard filter.
Changes in v2:
- Fix infinit loop for multiple symbols.
- Fix memory leaks for copied string and entry array.
- Update for new fprobe APIs.
- Fix style issues.
---
samples/Kconfig | 7 ++
samples/Makefile | 1
samples/fprobe/Makefile | 3 +
samples/fprobe/fprobe_example.c | 120 +++++++++++++++++++++++++++++++++++++++
4 files changed, 131 insertions(+)
create mode 100644 samples/fprobe/Makefile
create mode 100644 samples/fprobe/fprobe_example.c
diff --git a/samples/Kconfig b/samples/Kconfig
index 22cc921ae291..8415d60ea5f4 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -73,6 +73,13 @@ config SAMPLE_HW_BREAKPOINT
help
This builds kernel hardware breakpoint example modules.
+config SAMPLE_FPROBE
+ tristate "Build fprobe examples -- loadable modules only"
+ depends on FPROBE && m
+ help
+ This builds a fprobe example module. This module has an option 'symbol'.
+ You can specify a probed symbol or symbols separated with ','.
+
config SAMPLE_KFIFO
tristate "Build kfifo examples -- loadable modules only"
depends on m
diff --git a/samples/Makefile b/samples/Makefile
index 1ae4de99c983..6d662965be5b 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -33,3 +33,4 @@ subdir-$(CONFIG_SAMPLE_WATCHDOG) += watchdog
subdir-$(CONFIG_SAMPLE_WATCH_QUEUE) += watch_queue
obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak/
obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight/
+obj-$(CONFIG_SAMPLE_FPROBE) += fprobe/
diff --git a/samples/fprobe/Makefile b/samples/fprobe/Makefile
new file mode 100644
index 000000000000..ecccbfa6e99b
--- /dev/null
+++ b/samples/fprobe/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_SAMPLE_FPROBE) += fprobe_example.o
diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_example.c
new file mode 100644
index 000000000000..24d3cf109140
--- /dev/null
+++ b/samples/fprobe/fprobe_example.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Here's a sample kernel module showing the use of fprobe to dump a
+ * stack trace and selected registers when kernel_clone() is called.
+ *
+ * For more information on theory of operation of kprobes, see
+ * Documentation/trace/kprobes.rst
+ *
+ * You will see the trace data in /var/log/messages and on the console
+ * whenever kernel_clone() is invoked to create a new process.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fprobe.h>
+#include <linux/sched/debug.h>
+#include <linux/slab.h>
+
+#define BACKTRACE_DEPTH 16
+#define MAX_SYMBOL_LEN 4096
+struct fprobe sample_probe;
+
+static char symbol[MAX_SYMBOL_LEN] = "kernel_clone";
+module_param_string(symbol, symbol, sizeof(symbol), 0644);
+static char nosymbol[MAX_SYMBOL_LEN] = "";
+module_param_string(nosymbol, nosymbol, sizeof(nosymbol), 0644);
+static bool stackdump = true;
+module_param(stackdump, bool, 0644);
+
+static void show_backtrace(void)
+{
+ unsigned long stacks[BACKTRACE_DEPTH];
+ unsigned int len;
+
+ len = stack_trace_save(stacks, BACKTRACE_DEPTH, 2);
+ stack_trace_print(stacks, len, 24);
+}
+
+static void sample_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
+{
+ pr_info("Enter <%pS> ip = 0x%p\n", (void *)ip, (void *)ip);
+ if (stackdump)
+ show_backtrace();
+}
+
+static void sample_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
+{
+ unsigned long rip = instruction_pointer(regs);
+
+ pr_info("Return from <%pS> ip = 0x%p to rip = 0x%p (%pS)\n",
+ (void *)ip, (void *)ip, (void *)rip, (void *)rip);
+ if (stackdump)
+ show_backtrace();
+}
+
+static int __init fprobe_init(void)
+{
+ char *p, *symbuf = NULL;
+ const char **syms;
+ int ret, count, i;
+
+ sample_probe.entry_handler = sample_entry_handler;
+ sample_probe.exit_handler = sample_exit_handler;
+
+ if (strchr(symbol, '*')) {
+ /* filter based fprobe */
+ ret = register_fprobe(&sample_probe, symbol,
+ nosymbol[0] == '\0' ? NULL : nosymbol);
+ goto out;
+ } else if (!strchr(symbol, ',')) {
+ symbuf = symbol;
+ ret = register_fprobe_syms(&sample_probe, (const char **)&symbuf, 1);
+ goto out;
+ }
+
+ /* Comma separated symbols */
+ symbuf = kstrdup(symbol, GFP_KERNEL);
+ if (!symbuf)
+ return -ENOMEM;
+ p = symbuf;
+ count = 1;
+ while ((p = strchr(++p, ',')) != NULL)
+ count++;
+
+ pr_info("%d symbols found\n", count);
+
+ syms = kcalloc(count, sizeof(char *), GFP_KERNEL);
+ if (!syms) {
+ kfree(symbuf);
+ return -ENOMEM;
+ }
+
+ p = symbuf;
+ for (i = 0; i < count; i++)
+ syms[i] = strsep(&p, ",");
+
+ ret = register_fprobe_syms(&sample_probe, syms, count);
+ kfree(syms);
+ kfree(symbuf);
+out:
+ if (ret < 0)
+ pr_err("register_fprobe failed, returned %d\n", ret);
+ else
+ pr_info("Planted fprobe at %s\n", symbol);
+
+ return ret;
+}
+
+static void __exit fprobe_exit(void)
+{
+ unregister_fprobe(&sample_probe);
+
+ pr_info("fprobe at %s unregistered\n", symbol);
+}
+
+module_init(fprobe_init)
+module_exit(fprobe_exit)
+MODULE_LICENSE("GPL");
