kprobes: add tests for register_kprobes

Add testcases for *probe batch registration (register_kprobes) to kprobes
sanity tests.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: David Miller <davem@davemloft.net>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
index 9c0127e..4f10451 100644 (file)
--- a/kernel/test_kprobes.c
+++ b/kernel/test_kprobes.c
@@ -23,6 +23,7 @@
 static u32 rand1, preh_val, posth_val, jph_val;
 static int errors, handler_errors, num_tests;
 static u32 (*target)(u32 value);
+static u32 (*target2)(u32 value);
 
 static noinline u32 kprobe_target(u32 value)
 {
@@ -81,6 +82,84 @@ static int test_kprobe(void)
        return 0;
 }
 
+static noinline u32 kprobe_target2(u32 value)
+{
+       return (value / div_factor) + 1;
+}
+
+static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs)
+{
+       preh_val = (rand1 / div_factor) + 1;
+       return 0;
+}
+
+static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs,
+               unsigned long flags)
+{
+       if (preh_val != (rand1 / div_factor) + 1) {
+               handler_errors++;
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "incorrect value in post_handler2\n");
+       }
+       posth_val = preh_val + div_factor;
+}
+
+static struct kprobe kp2 = {
+       .symbol_name = "kprobe_target2",
+       .pre_handler = kp_pre_handler2,
+       .post_handler = kp_post_handler2
+};
+
+static int test_kprobes(void)
+{
+       int ret;
+       struct kprobe *kps[2] = {&kp, &kp2};
+
+       kp.addr = 0; /* addr should be cleard for reusing kprobe. */
+       ret = register_kprobes(kps, 2);
+       if (ret < 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "register_kprobes returned %d\n", ret);
+               return ret;
+       }
+
+       preh_val = 0;
+       posth_val = 0;
+       ret = target(rand1);
+
+       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++;
+       }
+
+       preh_val = 0;
+       posth_val = 0;
+       ret = target2(rand1);
+
+       if (preh_val == 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "kprobe pre_handler2 not called\n");
+               handler_errors++;
+       }
+
+       if (posth_val == 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "kprobe post_handler2 not called\n");
+               handler_errors++;
+       }
+
+       unregister_kprobes(kps, 2);
+       return 0;
+
+}
+
 static u32 j_kprobe_target(u32 value)
 {
        if (value != rand1) {
@@ -121,6 +200,43 @@ static int test_jprobe(void)
        return 0;
 }
 
+static struct jprobe jp2 = {
+       .entry          = j_kprobe_target,
+       .kp.symbol_name = "kprobe_target2"
+};
+
+static int test_jprobes(void)
+{
+       int ret;
+       struct jprobe *jps[2] = {&jp, &jp2};
+
+       jp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */
+       ret = register_jprobes(jps, 2);
+       if (ret < 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "register_jprobes returned %d\n", ret);
+               return ret;
+       }
+
+       jph_val = 0;
+       ret = target(rand1);
+       if (jph_val == 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "jprobe handler not called\n");
+               handler_errors++;
+       }
+
+       jph_val = 0;
+       ret = target2(rand1);
+       if (jph_val == 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "jprobe handler2 not called\n");
+               handler_errors++;
+       }
+       unregister_jprobes(jps, 2);
+
+       return 0;
+}
 #ifdef CONFIG_KRETPROBES
 static u32 krph_val;
 
@@ -176,6 +292,63 @@ static int test_kretprobe(void)
 
        return 0;
 }
+
+static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+       unsigned long ret = regs_return_value(regs);
+
+       if (ret != (rand1 / div_factor) + 1) {
+               handler_errors++;
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "incorrect value in kretprobe handler2\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 rp2 = {
+       .handler        = return_handler2,
+       .entry_handler  = entry_handler,
+       .kp.symbol_name = "kprobe_target2"
+};
+
+static int test_kretprobes(void)
+{
+       int ret;
+       struct kretprobe *rps[2] = {&rp, &rp2};
+
+       rp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */
+       ret = register_kretprobes(rps, 2);
+       if (ret < 0) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "register_kretprobe returned %d\n", ret);
+               return ret;
+       }
+
+       krph_val = 0;
+       ret = target(rand1);
+       if (krph_val != rand1) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "kretprobe handler not called\n");
+               handler_errors++;
+       }
+
+       krph_val = 0;
+       ret = target2(rand1);
+       if (krph_val != rand1) {
+               printk(KERN_ERR "Kprobe smoke test failed: "
+                               "kretprobe handler2 not called\n");
+               handler_errors++;
+       }
+       unregister_kretprobes(rps, 2);
+       return 0;
+}
 #endif /* CONFIG_KRETPROBES */
 
 int init_test_probes(void)
@@ -183,6 +356,7 @@ int init_test_probes(void)
        int ret;
 
        target = kprobe_target;
+       target2 = kprobe_target2;
 
        do {
                rand1 = random32();
@@ -195,15 +369,30 @@ int init_test_probes(void)
                errors++;
 
        num_tests++;
+       ret = test_kprobes();
+       if (ret < 0)
+               errors++;
+
+       num_tests++;
        ret = test_jprobe();
        if (ret < 0)
                errors++;
 
+       num_tests++;
+       ret = test_jprobes();
+       if (ret < 0)
+               errors++;
+
 #ifdef CONFIG_KRETPROBES
        num_tests++;
        ret = test_kretprobe();
        if (ret < 0)
                errors++;
+
+       num_tests++;
+       ret = test_kretprobes();
+       if (ret < 0)
+               errors++;
 #endif /* CONFIG_KRETPROBES */
 
        if (errors)