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158 lines
3.5 KiB
158 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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*/ |
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#include <linux/audit.h> |
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#include <linux/ptrace.h> |
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#include <linux/sched.h> |
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#include <linux/tracehook.h> |
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#include <linux/uaccess.h> |
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#include <asm/ptrace-abi.h> |
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void user_enable_single_step(struct task_struct *child) |
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{ |
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child->ptrace |= PT_DTRACE; |
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child->thread.singlestep_syscall = 0; |
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#ifdef SUBARCH_SET_SINGLESTEPPING |
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SUBARCH_SET_SINGLESTEPPING(child, 1); |
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#endif |
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} |
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void user_disable_single_step(struct task_struct *child) |
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{ |
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child->ptrace &= ~PT_DTRACE; |
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child->thread.singlestep_syscall = 0; |
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#ifdef SUBARCH_SET_SINGLESTEPPING |
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SUBARCH_SET_SINGLESTEPPING(child, 0); |
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#endif |
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} |
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/* |
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* Called by kernel/ptrace.c when detaching.. |
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*/ |
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void ptrace_disable(struct task_struct *child) |
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{ |
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user_disable_single_step(child); |
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} |
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extern int peek_user(struct task_struct * child, long addr, long data); |
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extern int poke_user(struct task_struct * child, long addr, long data); |
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long arch_ptrace(struct task_struct *child, long request, |
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unsigned long addr, unsigned long data) |
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{ |
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int i, ret; |
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unsigned long __user *p = (void __user *)data; |
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void __user *vp = p; |
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switch (request) { |
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/* read the word at location addr in the USER area. */ |
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case PTRACE_PEEKUSR: |
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ret = peek_user(child, addr, data); |
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break; |
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/* write the word at location addr in the USER area */ |
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case PTRACE_POKEUSR: |
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ret = poke_user(child, addr, data); |
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break; |
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case PTRACE_SYSEMU: |
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case PTRACE_SYSEMU_SINGLESTEP: |
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ret = -EIO; |
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break; |
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#ifdef PTRACE_GETREGS |
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case PTRACE_GETREGS: { /* Get all gp regs from the child. */ |
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if (!access_ok(p, MAX_REG_OFFSET)) { |
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ret = -EIO; |
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break; |
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} |
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for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { |
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__put_user(getreg(child, i), p); |
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p++; |
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} |
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ret = 0; |
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break; |
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} |
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#endif |
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#ifdef PTRACE_SETREGS |
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case PTRACE_SETREGS: { /* Set all gp regs in the child. */ |
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unsigned long tmp = 0; |
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if (!access_ok(p, MAX_REG_OFFSET)) { |
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ret = -EIO; |
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break; |
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} |
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for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { |
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__get_user(tmp, p); |
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putreg(child, i, tmp); |
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p++; |
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} |
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ret = 0; |
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break; |
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} |
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#endif |
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case PTRACE_GET_THREAD_AREA: |
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ret = ptrace_get_thread_area(child, addr, vp); |
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break; |
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case PTRACE_SET_THREAD_AREA: |
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ret = ptrace_set_thread_area(child, addr, vp); |
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break; |
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default: |
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ret = ptrace_request(child, request, addr, data); |
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if (ret == -EIO) |
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ret = subarch_ptrace(child, request, addr, data); |
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break; |
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} |
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return ret; |
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} |
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static void send_sigtrap(struct uml_pt_regs *regs, int error_code) |
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{ |
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/* Send us the fake SIGTRAP */ |
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force_sig_fault(SIGTRAP, TRAP_BRKPT, |
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/* User-mode eip? */ |
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UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL); |
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} |
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/* |
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* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and |
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* PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check |
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*/ |
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int syscall_trace_enter(struct pt_regs *regs) |
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{ |
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audit_syscall_entry(UPT_SYSCALL_NR(®s->regs), |
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UPT_SYSCALL_ARG1(®s->regs), |
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UPT_SYSCALL_ARG2(®s->regs), |
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UPT_SYSCALL_ARG3(®s->regs), |
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UPT_SYSCALL_ARG4(®s->regs)); |
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if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
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return 0; |
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return tracehook_report_syscall_entry(regs); |
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} |
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void syscall_trace_leave(struct pt_regs *regs) |
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{ |
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int ptraced = current->ptrace; |
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audit_syscall_exit(regs); |
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/* Fake a debug trap */ |
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if (ptraced & PT_DTRACE) |
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send_sigtrap(®s->regs, 0); |
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if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
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return; |
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tracehook_report_syscall_exit(regs, 0); |
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/* force do_signal() --> is_syscall() */ |
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if (ptraced & PT_PTRACED) |
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set_thread_flag(TIF_SIGPENDING); |
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}
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