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kernel/test_kprobes.c
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/* * 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. */ |
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#define pr_fmt(fmt) "Kprobe smoke test: " fmt |
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#include <linux/kernel.h> #include <linux/kprobes.h> #include <linux/random.h> #define div_factor 3 |
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static u32 rand1, preh_val, posth_val; |
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static int errors, handler_errors, num_tests; |
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static u32 (*target)(u32 value); |
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static u32 (*target2)(u32 value); |
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static noinline u32 kprobe_target(u32 value) { |
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return (value / div_factor); } static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) { |
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if (preemptible()) { handler_errors++; pr_err("pre-handler is preemptible "); } |
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preh_val = (rand1 / div_factor); return 0; } static void kp_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { |
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if (preemptible()) { handler_errors++; pr_err("post-handler is preemptible "); } |
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if (preh_val != (rand1 / div_factor)) { handler_errors++; |
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pr_err("incorrect value in post_handler "); |
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} 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) { |
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pr_err("register_kprobe returned %d ", ret); |
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return ret; } |
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ret = target(rand1); |
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unregister_kprobe(&kp); if (preh_val == 0) { |
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pr_err("kprobe pre_handler not called "); |
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handler_errors++; } if (posth_val == 0) { |
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pr_err("kprobe post_handler not called "); |
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handler_errors++; } return 0; } |
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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++; |
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pr_err("incorrect value in post_handler2 "); |
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} 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}; |
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/* addr and flags should be cleard for reusing kprobe. */ kp.addr = NULL; kp.flags = 0; |
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ret = register_kprobes(kps, 2); if (ret < 0) { |
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pr_err("register_kprobes returned %d ", ret); |
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return ret; } preh_val = 0; posth_val = 0; ret = target(rand1); if (preh_val == 0) { |
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pr_err("kprobe pre_handler not called "); |
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handler_errors++; } if (posth_val == 0) { |
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pr_err("kprobe post_handler not called "); |
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handler_errors++; } preh_val = 0; posth_val = 0; ret = target2(rand1); if (preh_val == 0) { |
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pr_err("kprobe pre_handler2 not called "); |
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handler_errors++; } if (posth_val == 0) { |
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pr_err("kprobe post_handler2 not called "); |
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handler_errors++; } unregister_kprobes(kps, 2); return 0; } |
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#ifdef CONFIG_KRETPROBES static u32 krph_val; |
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static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { |
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if (preemptible()) { handler_errors++; pr_err("kretprobe entry handler is preemptible "); } |
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krph_val = (rand1 / div_factor); return 0; } |
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static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long ret = regs_return_value(regs); |
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if (preemptible()) { handler_errors++; pr_err("kretprobe return handler is preemptible "); } |
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if (ret != (rand1 / div_factor)) { handler_errors++; |
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pr_err("incorrect value in kretprobe handler "); |
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} |
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if (krph_val == 0) { handler_errors++; |
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pr_err("call to kretprobe entry handler failed "); |
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} |
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krph_val = rand1; |
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return 0; } static struct kretprobe rp = { .handler = return_handler, |
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.entry_handler = entry_handler, |
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.kp.symbol_name = "kprobe_target" }; static int test_kretprobe(void) { int ret; ret = register_kretprobe(&rp); if (ret < 0) { |
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pr_err("register_kretprobe returned %d ", ret); |
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return ret; } |
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ret = target(rand1); |
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unregister_kretprobe(&rp); |
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if (krph_val != rand1) { |
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pr_err("kretprobe handler not called "); |
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handler_errors++; } return 0; } |
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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++; |
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pr_err("incorrect value in kretprobe handler2 "); |
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} if (krph_val == 0) { handler_errors++; |
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pr_err("call to kretprobe entry handler failed "); |
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} 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}; |
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/* addr and flags should be cleard for reusing kprobe. */ rp.kp.addr = NULL; rp.kp.flags = 0; |
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ret = register_kretprobes(rps, 2); if (ret < 0) { |
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pr_err("register_kretprobe returned %d ", ret); |
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return ret; } krph_val = 0; ret = target(rand1); if (krph_val != rand1) { |
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pr_err("kretprobe handler not called "); |
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handler_errors++; } krph_val = 0; ret = target2(rand1); if (krph_val != rand1) { |
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pr_err("kretprobe handler2 not called "); |
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handler_errors++; } unregister_kretprobes(rps, 2); return 0; } |
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#endif /* CONFIG_KRETPROBES */ int init_test_probes(void) { int ret; |
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target = kprobe_target; |
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target2 = kprobe_target2; |
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do { |
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rand1 = prandom_u32(); |
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} while (rand1 <= div_factor); |
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pr_info("started "); |
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num_tests++; ret = test_kprobe(); if (ret < 0) errors++; num_tests++; |
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ret = test_kprobes(); if (ret < 0) errors++; |
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#ifdef CONFIG_KRETPROBES num_tests++; ret = test_kretprobe(); if (ret < 0) errors++; |
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num_tests++; ret = test_kretprobes(); if (ret < 0) errors++; |
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#endif /* CONFIG_KRETPROBES */ if (errors) |
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pr_err("BUG: %d out of %d tests failed ", errors, num_tests); |
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else if (handler_errors) |
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pr_err("BUG: %d error(s) running handlers ", handler_errors); |
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else |
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pr_info("passed successfully "); |
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return 0; } |