160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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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(VERIFY_WRITE, 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(VERIFY_READ, 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 task_struct *tsk, struct uml_pt_regs *regs,
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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, tsk);
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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(current, ®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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