fprobe: Add exit_handler support

Add exit_handler to fprobe. fprobe + rethook allows us to hook the kernel
function return. The rethook will be enabled only if the
fprobe::exit_handler is set.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164735290790.1084943.10601965782208052202.stgit@devnote2

include/linux/fprobe.h

@@ -5,13 +5,16 @@
 
 #include <linux/compiler.h>
 #include <linux/ftrace.h>
+#include <linux/rethook.h>
 
 /**
  * struct fprobe - ftrace based probe.
  * @ops: The ftrace_ops.
  * @nmissed: The counter for missing events.
  * @flags: The status flag.
+ * @rethook: The rethook data structure. (internal data)
  * @entry_handler: The callback function for function entry.
+ * @exit_handler: The callback function for function exit.
  */
 struct fprobe {
 #ifdef CONFIG_FUNCTION_TRACER
@@ -25,7 +28,10 @@ struct fprobe {
 #endif
 	unsigned long		nmissed;
 	unsigned int		flags;
+	struct rethook		*rethook;
+
 	void (*entry_handler)(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs);
+	void (*exit_handler)(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs);
 };
 
 #define FPROBE_FL_DISABLED	1

kernel/trace/Kconfig

@@ -251,11 +251,14 @@ config FPROBE
 	bool "Kernel Function Probe (fprobe)"
 	depends on FUNCTION_TRACER
 	depends on DYNAMIC_FTRACE_WITH_REGS
+	depends on HAVE_RETHOOK
+	select RETHOOK
 	default n
 	help
-	  This option enables kernel function probe (fprobe) based on ftrace,
+	  This option enables kernel function probe (fprobe) based on ftrace.
-	  which is similar to kprobes, but probes only for kernel function
+	  The fprobe is similar to kprobes, but probes only for kernel function
-	  entries and it can probe multiple functions by one fprobe.
+	  entries and exits. This also can probe multiple functions by one
+	  fprobe.
 
 	  If unsure, say N.
 

kernel/trace/fprobe.c

@@ -8,12 +8,22 @@
 #include <linux/fprobe.h>
 #include <linux/kallsyms.h>
 #include <linux/kprobes.h>
+#include <linux/rethook.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
 
+#include "trace.h"
+
+struct fprobe_rethook_node {
+	struct rethook_node node;
+	unsigned long entry_ip;
+};
+
 static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
 			   struct ftrace_ops *ops, struct ftrace_regs *fregs)
 {
+	struct fprobe_rethook_node *fpr;
+	struct rethook_node *rh;
 	struct fprobe *fp;
 	int bit;
 
@@ -30,10 +40,37 @@ static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
 	if (fp->entry_handler)
 		fp->entry_handler(fp, ip, ftrace_get_regs(fregs));
 
+	if (fp->exit_handler) {
+		rh = rethook_try_get(fp->rethook);
+		if (!rh) {
+			fp->nmissed++;
+			goto out;
+		}
+		fpr = container_of(rh, struct fprobe_rethook_node, node);
+		fpr->entry_ip = ip;
+		rethook_hook(rh, ftrace_get_regs(fregs), true);
+	}
+
+out:
 	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(fprobe_handler);
 
+static void fprobe_exit_handler(struct rethook_node *rh, void *data,
+				struct pt_regs *regs)
+{
+	struct fprobe *fp = (struct fprobe *)data;
+	struct fprobe_rethook_node *fpr;
+
+	if (!fp || fprobe_disabled(fp))
+		return;
+
+	fpr = container_of(rh, struct fprobe_rethook_node, node);
+
+	fp->exit_handler(fp, fpr->entry_ip, regs);
+}
+NOKPROBE_SYMBOL(fprobe_exit_handler);
+
 /* Convert ftrace location address from symbols */
 static unsigned long *get_ftrace_locations(const char **syms, int num)
 {
@@ -77,6 +114,48 @@ static void fprobe_init(struct fprobe *fp)
 	fp->ops.flags |= FTRACE_OPS_FL_SAVE_REGS;
 }
 
+static int fprobe_init_rethook(struct fprobe *fp, int num)
+{
+	int i, size;
+
+	if (num < 0)
+		return -EINVAL;
+
+	if (!fp->exit_handler) {
+		fp->rethook = NULL;
+		return 0;
+	}
+
+	/* Initialize rethook if needed */
+	size = num * num_possible_cpus() * 2;
+	if (size < 0)
+		return -E2BIG;
+
+	fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler);
+	for (i = 0; i < size; i++) {
+		struct rethook_node *node;
+
+		node = kzalloc(sizeof(struct fprobe_rethook_node), GFP_KERNEL);
+		if (!node) {
+			rethook_free(fp->rethook);
+			fp->rethook = NULL;
+			return -ENOMEM;
+		}
+		rethook_add_node(fp->rethook, node);
+	}
+	return 0;
+}
+
+static void fprobe_fail_cleanup(struct fprobe *fp)
+{
+	if (fp->rethook) {
+		/* Don't need to cleanup rethook->handler because this is not used. */
+		rethook_free(fp->rethook);
+		fp->rethook = NULL;
+	}
+	ftrace_free_filter(&fp->ops);
+}
+
 /**
  * register_fprobe() - Register fprobe to ftrace by pattern.
  * @fp: A fprobe data structure to be registered.
@@ -90,6 +169,7 @@ static void fprobe_init(struct fprobe *fp)
  */
 int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter)
 {
+	struct ftrace_hash *hash;
 	unsigned char *str;
 	int ret, len;
 
@@ -114,10 +194,21 @@ int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter
 			goto out;
 	}
 
-	ret = register_ftrace_function(&fp->ops);
+	/* TODO:
+	 * correctly calculate the total number of filtered symbols
+	 * from both filter and notfilter.
+	 */
+	hash = fp->ops.local_hash.filter_hash;
+	if (WARN_ON_ONCE(!hash))
+		goto out;
+
+	ret = fprobe_init_rethook(fp, (int)hash->count);
+	if (!ret)
+		ret = register_ftrace_function(&fp->ops);
+
 out:
 	if (ret)
-		ftrace_free_filter(&fp->ops);
+		fprobe_fail_cleanup(fp);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(register_fprobe);
@@ -145,12 +236,15 @@ int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num)
 	fprobe_init(fp);
 
 	ret = ftrace_set_filter_ips(&fp->ops, addrs, num, 0, 0);
+	if (ret)
+		return ret;
+
+	ret = fprobe_init_rethook(fp, num);
 	if (!ret)
 		ret = register_ftrace_function(&fp->ops);
 
 	if (ret)
-		ftrace_free_filter(&fp->ops);
+		fprobe_fail_cleanup(fp);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(register_fprobe_ips);
@@ -201,10 +295,20 @@ int unregister_fprobe(struct fprobe *fp)
 	if (!fp || fp->ops.func != fprobe_handler)
 		return -EINVAL;
 
-	ret = unregister_ftrace_function(&fp->ops);
+	/*
+	 * rethook_free() starts disabling the rethook, but the rethook handlers
+	 * may be running on other processors at this point. To make sure that all
+	 * current running handlers are finished, call unregister_ftrace_function()
+	 * after this.
+	 */
+	if (fp->rethook)
+		rethook_free(fp->rethook);
 
-	if (!ret)
+	ret = unregister_ftrace_function(&fp->ops);
-		ftrace_free_filter(&fp->ops);
+	if (ret < 0)
+		return ret;
+
+	ftrace_free_filter(&fp->ops);
 
 	return ret;
 }