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120 lines
3.4 KiB
120 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Here's a sample kernel module showing the use of kprobes to dump a |
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* stack trace and selected registers when kernel_clone() is called. |
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* |
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* For more information on theory of operation of kprobes, see |
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* Documentation/trace/kprobes.rst |
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* |
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* You will see the trace data in /var/log/messages and on the console |
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* whenever kernel_clone() is invoked to create a new process. |
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*/ |
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#define pr_fmt(fmt) "%s: " fmt, __func__ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/kprobes.h> |
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static char symbol[KSYM_NAME_LEN] = "kernel_clone"; |
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module_param_string(symbol, symbol, KSYM_NAME_LEN, 0644); |
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/* For each probe you need to allocate a kprobe structure */ |
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static struct kprobe kp = { |
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.symbol_name = symbol, |
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}; |
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/* kprobe pre_handler: called just before the probed instruction is executed */ |
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static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs) |
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{ |
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#ifdef CONFIG_X86 |
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pr_info("<%s> p->addr = 0x%p, ip = %lx, flags = 0x%lx\n", |
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p->symbol_name, p->addr, regs->ip, regs->flags); |
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#endif |
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#ifdef CONFIG_PPC |
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pr_info("<%s> p->addr = 0x%p, nip = 0x%lx, msr = 0x%lx\n", |
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p->symbol_name, p->addr, regs->nip, regs->msr); |
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#endif |
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#ifdef CONFIG_MIPS |
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pr_info("<%s> p->addr = 0x%p, epc = 0x%lx, status = 0x%lx\n", |
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p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status); |
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#endif |
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#ifdef CONFIG_ARM64 |
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pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, pstate = 0x%lx\n", |
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p->symbol_name, p->addr, (long)regs->pc, (long)regs->pstate); |
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#endif |
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#ifdef CONFIG_ARM |
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pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, cpsr = 0x%lx\n", |
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p->symbol_name, p->addr, (long)regs->ARM_pc, (long)regs->ARM_cpsr); |
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#endif |
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#ifdef CONFIG_RISCV |
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pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, status = 0x%lx\n", |
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p->symbol_name, p->addr, regs->epc, regs->status); |
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#endif |
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#ifdef CONFIG_S390 |
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pr_info("<%s> p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n", |
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p->symbol_name, p->addr, regs->psw.addr, regs->flags); |
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#endif |
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/* A dump_stack() here will give a stack backtrace */ |
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return 0; |
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} |
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/* kprobe post_handler: called after the probed instruction is executed */ |
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static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs, |
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unsigned long flags) |
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{ |
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#ifdef CONFIG_X86 |
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pr_info("<%s> p->addr = 0x%p, flags = 0x%lx\n", |
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p->symbol_name, p->addr, regs->flags); |
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#endif |
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#ifdef CONFIG_PPC |
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pr_info("<%s> p->addr = 0x%p, msr = 0x%lx\n", |
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p->symbol_name, p->addr, regs->msr); |
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#endif |
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#ifdef CONFIG_MIPS |
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pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n", |
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p->symbol_name, p->addr, regs->cp0_status); |
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#endif |
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#ifdef CONFIG_ARM64 |
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pr_info("<%s> p->addr = 0x%p, pstate = 0x%lx\n", |
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p->symbol_name, p->addr, (long)regs->pstate); |
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#endif |
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#ifdef CONFIG_ARM |
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pr_info("<%s> p->addr = 0x%p, cpsr = 0x%lx\n", |
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p->symbol_name, p->addr, (long)regs->ARM_cpsr); |
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#endif |
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#ifdef CONFIG_RISCV |
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pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n", |
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p->symbol_name, p->addr, regs->status); |
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#endif |
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#ifdef CONFIG_S390 |
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pr_info("<%s> p->addr, 0x%p, flags = 0x%lx\n", |
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p->symbol_name, p->addr, regs->flags); |
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#endif |
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} |
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static int __init kprobe_init(void) |
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{ |
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int ret; |
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kp.pre_handler = handler_pre; |
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kp.post_handler = handler_post; |
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ret = register_kprobe(&kp); |
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if (ret < 0) { |
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pr_err("register_kprobe failed, returned %d\n", ret); |
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return ret; |
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} |
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pr_info("Planted kprobe at %p\n", kp.addr); |
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return 0; |
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} |
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static void __exit kprobe_exit(void) |
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{ |
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unregister_kprobe(&kp); |
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pr_info("kprobe at %p unregistered\n", kp.addr); |
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} |
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module_init(kprobe_init) |
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module_exit(kprobe_exit) |
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MODULE_LICENSE("GPL");
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