389 lines
9.0 KiB
C
389 lines
9.0 KiB
C
/*
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* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/sched.h"
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#include "linux/mm.h"
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#include "linux/errno.h"
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#include "linux/smp_lock.h"
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#include "linux/security.h"
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#include "linux/ptrace.h"
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#include "linux/audit.h"
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#ifdef CONFIG_PROC_MM
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#include "linux/proc_mm.h"
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#endif
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#include "asm/ptrace.h"
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#include "asm/uaccess.h"
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#include "kern_util.h"
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#include "skas_ptrace.h"
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#include "sysdep/ptrace.h"
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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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child->ptrace &= ~PT_DTRACE;
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child->thread.singlestep_syscall = 0;
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}
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long sys_ptrace(long request, long pid, long addr, long data)
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{
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struct task_struct *child;
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int i, ret;
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lock_kernel();
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ret = -EPERM;
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if (request == PTRACE_TRACEME) {
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED)
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goto out;
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ret = security_ptrace(current->parent, current);
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if (ret)
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goto out;
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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ret = 0;
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goto out;
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}
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ret = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child)
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goto out;
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ret = -EPERM;
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if (pid == 1) /* you may not mess with init */
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goto out_tsk;
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if (request == PTRACE_ATTACH) {
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ret = ptrace_attach(child);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out_tsk;
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switch (request) {
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/* when I and D space are separate, these will need to be fixed. */
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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unsigned long tmp;
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int copied;
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ret = -EIO;
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copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp, (unsigned long __user *) data);
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break;
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}
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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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unsigned long tmp;
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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tmp = 0; /* Default return condition */
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if(addr < MAX_REG_OFFSET){
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tmp = getreg(child, addr);
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}
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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tmp = child->thread.arch.debugregs[addr];
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}
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ret = put_user(tmp, (unsigned long __user *) data);
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break;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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ret = -EIO;
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if (access_process_vm(child, addr, &data, sizeof(data),
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1) != sizeof(data))
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break;
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ret = 0;
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break;
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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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if (addr < MAX_REG_OFFSET) {
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ret = putreg(child, addr, data);
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break;
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}
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#if 0 /* XXX x86_64 */
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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if((addr == 4) || (addr == 5)) break;
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child->thread.arch.debugregs[addr] = data;
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ret = 0;
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}
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#endif
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break;
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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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if ((unsigned long) data > _NSIG)
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break;
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child->ptrace &= ~PT_DTRACE;
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child->thread.singlestep_syscall = 0;
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if (request == PTRACE_SYSCALL) {
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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else {
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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child->exit_code = data;
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wake_up_process(child);
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ret = 0;
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break;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL: {
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ret = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->ptrace &= ~PT_DTRACE;
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child->thread.singlestep_syscall = 0;
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child->exit_code = SIGKILL;
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wake_up_process(child);
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break;
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}
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case PTRACE_SINGLESTEP: { /* set the trap flag. */
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ret = -EIO;
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if ((unsigned long) data > _NSIG)
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->ptrace |= PT_DTRACE;
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child->thread.singlestep_syscall = 0;
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child->exit_code = data;
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/* give it a chance to run. */
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wake_up_process(child);
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ret = 0;
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break;
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}
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case PTRACE_DETACH:
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/* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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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, (unsigned long *)data,
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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),
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(unsigned long __user *) data);
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data += sizeof(long);
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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, (unsigned *)data,
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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, (unsigned long __user *) data);
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putreg(child, i, tmp);
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data += sizeof(long);
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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_GETFPREGS
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case PTRACE_GETFPREGS: /* Get the child FPU state. */
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ret = get_fpregs(data, child);
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break;
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#endif
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#ifdef PTRACE_SETFPREGS
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case PTRACE_SETFPREGS: /* Set the child FPU state. */
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ret = set_fpregs(data, child);
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break;
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#endif
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#ifdef PTRACE_GETFPXREGS
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case PTRACE_GETFPXREGS: /* Get the child FPU state. */
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ret = get_fpxregs(data, child);
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break;
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#endif
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#ifdef PTRACE_SETFPXREGS
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case PTRACE_SETFPXREGS: /* Set the child FPU state. */
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ret = set_fpxregs(data, child);
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break;
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#endif
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case PTRACE_FAULTINFO: {
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struct ptrace_faultinfo fault;
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fault = ((struct ptrace_faultinfo)
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{ .is_write = child->thread.err,
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.addr = child->thread.cr2 });
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ret = copy_to_user((unsigned long __user *) data, &fault,
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sizeof(fault));
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if(ret)
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break;
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break;
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}
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case PTRACE_SIGPENDING:
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ret = copy_to_user((unsigned long __user *) data,
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&child->pending.signal,
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sizeof(child->pending.signal));
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break;
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case PTRACE_LDT: {
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struct ptrace_ldt ldt;
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if(copy_from_user(&ldt, (unsigned long __user *) data,
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sizeof(ldt))){
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ret = -EIO;
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break;
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}
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/* This one is confusing, so just punt and return -EIO for
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* now
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*/
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ret = -EIO;
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break;
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}
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#ifdef CONFIG_PROC_MM
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case PTRACE_SWITCH_MM: {
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struct mm_struct *old = child->mm;
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struct mm_struct *new = proc_mm_get_mm(data);
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if(IS_ERR(new)){
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ret = PTR_ERR(new);
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break;
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}
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atomic_inc(&new->mm_users);
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child->mm = new;
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child->active_mm = new;
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mmput(old);
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ret = 0;
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break;
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}
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#endif
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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out_tsk:
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put_task_struct(child);
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out:
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unlock_kernel();
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return ret;
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}
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void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
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int error_code)
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{
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struct siginfo info;
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memset(&info, 0, sizeof(info));
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info.si_signo = SIGTRAP;
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info.si_code = TRAP_BRKPT;
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/* User-mode eip? */
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info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
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/* Send us the fakey SIGTRAP */
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force_sig_info(SIGTRAP, &info, tsk);
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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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void syscall_trace(union uml_pt_regs *regs, int entryexit)
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{
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int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
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int tracesysgood;
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if (unlikely(current->audit_context)) {
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if (!entryexit)
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audit_syscall_entry(current,
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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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else
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audit_syscall_exit(current,
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UPT_SYSCALL_RET(®s->regs));
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}
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/* Fake a debug trap */
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if (is_singlestep)
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send_sigtrap(current, regs, 0);
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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if (!(current->ptrace & PT_PTRACED))
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return;
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/* the 0x80 provides a way for the tracing parent to distinguish
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between a syscall stop and SIGTRAP delivery */
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tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
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ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
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if (entryexit) /* force do_signal() --> is_syscall() */
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set_thread_flag(TIF_SIGPENDING);
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/* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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