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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>
This commit is contained in:
Masami Hiramatsu 2009-01-06 14:41:48 -08:00 committed by Linus Torvalds
parent 8e1144050e
commit 12da3b888b
1 changed files with 189 additions and 0 deletions
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189
kernel/test_kprobes.c
View File

@ -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();
@ -194,16 +368,31 @@ int init_test_probes(void)
if (ret < 0)
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)