2.6.25-rc7

 kernel

diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
new file mode 100644
index 0000000..06b6395
--- /dev/null
+++ b/kernel/test_kprobes.c
@@ -0,0 +1,228 @@
+/*
+ * test_kprobes.c - simple sanity test for *probes
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+#include <linux/random.h>
+
+#define div_factor 3
+
+static u32 rand1, preh_val, posth_val, jph_val;
+static int errors, handler_errors, num_tests;
+
+static noinline u32 kprobe_target(u32 value)
+{
+   /*
+    * gcc ignores noinline on some architectures unless we stuff
+    * sufficient lard into the function. The get_kprobe() here is
+    * just for that.
+    *
+    * NOTE: We aren't concerned about the correctness of get_kprobe()
+    * here; hence, this call is neither under !preempt nor with the
+    * kprobe_mutex held. This is fine(tm)
+    */
+   if (get_kprobe((void *)0xdeadbeef))
+      printk(KERN_INFO "Kprobe smoke test: probe on 0xdeadbeef!\n");
+
+   return (value / div_factor);
+}
+
+static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
+{
+   preh_val = (rand1 / div_factor);
+   return 0;
+}
+
+static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
+      unsigned long flags)
+{
+   if (preh_val != (rand1 / div_factor)) {
+      handler_errors++;
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "incorrect value in post_handler\n");
+   }
+   posth_val = preh_val + div_factor;
+}
+
+static struct kprobe kp = {
+   .symbol_name = "kprobe_target",
+   .pre_handler = kp_pre_handler,
+   .post_handler = kp_post_handler
+};
+
+static int test_kprobe(void)
+{
+   int ret;
+
+   ret = register_kprobe(&kp);
+   if (ret < 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "register_kprobe returned %d\n", ret);
+      return ret;
+   }
+
+   ret = kprobe_target(rand1);
+   unregister_kprobe(&kp);
+
+   if (preh_val == 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "kprobe pre_handler not called\n");
+      handler_errors++;
+   }
+
+   if (posth_val == 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "kprobe post_handler not called\n");
+      handler_errors++;
+   }
+
+   return 0;
+}
+
+static u32 j_kprobe_target(u32 value)
+{
+   if (value != rand1) {
+      handler_errors++;
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "incorrect value in jprobe handler\n");
+   }
+
+   jph_val = rand1;
+   jprobe_return();
+   return 0;
+}
+
+static struct jprobe jp = {
+   .entry      = j_kprobe_target,
+   .kp.symbol_name = "kprobe_target"
+};
+
+static int test_jprobe(void)
+{
+   int ret;
+
+   ret = register_jprobe(&jp);
+   if (ret < 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "register_jprobe returned %d\n", ret);
+      return ret;
+   }
+
+   ret = kprobe_target(rand1);
+   unregister_jprobe(&jp);
+   if (jph_val == 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "jprobe handler not called\n");
+      handler_errors++;
+   }
+
+   return 0;
+}
+
+#ifdef CONFIG_KRETPROBES
+static u32 krph_val;
+
+static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+   krph_val = (rand1 / div_factor);
+   return 0;
+}
+
+static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+   unsigned long ret = regs_return_value(regs);
+
+   if (ret != (rand1 / div_factor)) {
+      handler_errors++;
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "incorrect value in kretprobe handler\n");
+   }
+   if (krph_val == 0) {
+      handler_errors++;
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "call to kretprobe entry handler failed\n");
+   }
+
+   krph_val = rand1;
+   return 0;
+}
+
+static struct kretprobe rp = {
+   .handler   = return_handler,
+   .entry_handler  = entry_handler,
+   .kp.symbol_name = "kprobe_target"
+};
+
+static int test_kretprobe(void)
+{
+   int ret;
+
+   ret = register_kretprobe(&rp);
+   if (ret < 0) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "register_kretprobe returned %d\n", ret);
+      return ret;
+   }
+
+   ret = kprobe_target(rand1);
+   unregister_kretprobe(&rp);
+   if (krph_val != rand1) {
+      printk(KERN_ERR "Kprobe smoke test failed: "
+            "kretprobe handler not called\n");
+      handler_errors++;
+   }
+
+   return 0;
+}
+#endif /* CONFIG_KRETPROBES */
+
+int init_test_probes(void)
+{
+   int ret;
+
+   do {
+      rand1 = random32();
+   } while (rand1 <= div_factor);
+
+   printk(KERN_INFO "Kprobe smoke test started\n");
+   num_tests++;
+   ret = test_kprobe();
+   if (ret < 0)
+      errors++;
+
+   num_tests++;
+   ret = test_jprobe();
+   if (ret < 0)
+      errors++;
+
+#ifdef CONFIG_KRETPROBES
+   num_tests++;
+   ret = test_kretprobe();
+   if (ret < 0)
+      errors++;
+#endif /* CONFIG_KRETPROBES */
+
+   if (errors)
+      printk(KERN_ERR "BUG: Kprobe smoke test: %d out of "
+            "%d tests failed\n", errors, num_tests);
+   else if (handler_errors)
+      printk(KERN_ERR "BUG: Kprobe smoke test: %d error(s) "
+            "running handlers\n", handler_errors);
+   else
+      printk(KERN_INFO "Kprobe smoke test passed successfully\n");
+
+   return 0;
+}