@@ -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
@@ -32,3 +32,4 @@ obj-$(CONFIG_SAMPLE_INTEL_MEI) += mei/
subdir-$(CONFIG_SAMPLE_WATCHDOG) += watchdog
subdir-$(CONFIG_SAMPLE_WATCH_QUEUE) += watch_queue
obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak/
+obj-$(CONFIG_SAMPLE_FPROBE) += fprobe/
new file mode 100644
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_SAMPLE_FPROBE) += fprobe_example.o
new file mode 100644
@@ -0,0 +1,103 @@
+// 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/slab.h>
+
+#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 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);
+}
+
+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);
+}
+
+static char *symbuf;
+
+static int __init fprobe_init(void)
+{
+ const char **syms;
+ char *p;
+ int ret, count, i;
+
+ sample_probe.entry_handler = sample_entry_handler;
+ sample_probe.exit_handler = sample_exit_handler;
+
+ if (strchr(symbol, ',')) {
+ symbuf = kstrdup(symbol, GFP_KERNEL);
+ if (!symbuf)
+ return -ENOMEM;
+ p = symbuf;
+ count = 1;
+ while ((p = strchr(++p, ',')) != NULL)
+ count++;
+ } else {
+ count = 1;
+ symbuf = symbol;
+ }
+ pr_info("%d symbols found\n", count);
+
+ syms = kcalloc(count, sizeof(char *), GFP_KERNEL);
+ if (!syms) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ p = symbuf;
+ for (i = 0; i < count; i++)
+ syms[i] = strsep(&p, ",");
+
+ sample_probe.syms = syms;
+ sample_probe.nentry = count;
+
+ ret = register_fprobe(&sample_probe);
+ if (ret < 0) {
+ pr_err("register_fprobe failed, returned %d\n", ret);
+ goto error;
+ }
+ pr_info("Planted fprobe at %s\n", symbol);
+ return 0;
+
+error:
+ if (symbuf != symbol)
+ kfree(symbuf);
+ return ret;
+}
+
+static void __exit fprobe_exit(void)
+{
+ unregister_fprobe(&sample_probe);
+
+ kfree(sample_probe.syms);
+ if (symbuf != symbol)
+ kfree(symbuf);
+
+ pr_info("fprobe at %s unregistered\n", symbol);
+}
+
+module_init(fprobe_init)
+module_exit(fprobe_exit)
+MODULE_LICENSE("GPL");
Add a sample program for the fprobe. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> --- 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 | 103 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 114 insertions(+) create mode 100644 samples/fprobe/Makefile create mode 100644 samples/fprobe/fprobe_example.c