mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 21:46:39 +07:00
12da3b888b
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>
409 lines
8.4 KiB
C
409 lines
8.4 KiB
C
/*
|
|
* 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 u32 (*target)(u32 value);
|
|
static u32 (*target2)(u32 value);
|
|
|
|
static noinline u32 kprobe_target(u32 value)
|
|
{
|
|
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 = 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 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) {
|
|
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 = 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;
|
|
}
|
|
|
|
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;
|
|
|
|
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 = 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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
target = kprobe_target;
|
|
target2 = kprobe_target2;
|
|
|
|
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_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)
|
|
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;
|
|
}
|