diff options
Diffstat (limited to 'kernel/test_kprobes.c')
| -rw-r--r-- | kernel/test_kprobes.c | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c deleted file mode 100644 index 06b6395b45b2..000000000000 --- a/kernel/test_kprobes.c +++ /dev/null @@ -1,228 +0,0 @@ -/* - * 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; -} |