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