766 lines
18 KiB
C
766 lines
18 KiB
C
/* ptrace.c: FRV specific parts of process tracing
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*
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* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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* - Derived from arch/m68k/kernel/ptrace.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/config.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/unistd.h>
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Get contents of register REGNO in task TASK.
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*/
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static inline long get_reg(struct task_struct *task, int regno)
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{
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struct user_context *user = task->thread.user;
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if (regno < 0 || regno >= PT__END)
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return 0;
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return ((unsigned long *) user)[regno];
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int put_reg(struct task_struct *task, int regno,
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unsigned long data)
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{
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struct user_context *user = task->thread.user;
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if (regno < 0 || regno >= PT__END)
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return -EIO;
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switch (regno) {
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case PT_GR(0):
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return 0;
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case PT_PSR:
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case PT__STATUS:
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return -EIO;
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default:
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((unsigned long *) user)[regno] = data;
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return 0;
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}
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}
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/*
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* check that an address falls within the bounds of the target process's memory mappings
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*/
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static inline int is_user_addr_valid(struct task_struct *child,
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unsigned long start, unsigned long len)
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{
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#ifdef CONFIG_MMU
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if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
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return -EIO;
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return 0;
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#else
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struct vm_list_struct *vml;
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for (vml = child->mm->context.vmlist; vml; vml = vml->next)
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if (start >= vml->vma->vm_start && start + len <= vml->vma->vm_end)
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return 0;
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return -EIO;
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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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* Control h/w single stepping
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*/
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void ptrace_disable(struct task_struct *child)
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{
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child->thread.frame0->__status &= ~REG__STATUS_STEP;
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}
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void ptrace_enable(struct task_struct *child)
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{
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child->thread.frame0->__status |= REG__STATUS_STEP;
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}
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asmlinkage int 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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unsigned long tmp;
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int 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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int copied;
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ret = -EIO;
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if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
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break;
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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 *) 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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tmp = 0;
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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ret = 0;
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switch (addr >> 2) {
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case 0 ... PT__END - 1:
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tmp = get_reg(child, addr >> 2);
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break;
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case PT__END + 0:
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tmp = child->mm->end_code - child->mm->start_code;
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break;
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case PT__END + 1:
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tmp = child->mm->end_data - child->mm->start_data;
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break;
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case PT__END + 2:
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tmp = child->mm->start_stack - child->mm->start_brk;
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break;
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case PT__END + 3:
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tmp = child->mm->start_code;
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break;
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case PT__END + 4:
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tmp = child->mm->start_stack;
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break;
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default:
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ret = -EIO;
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break;
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}
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if (ret == 0)
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ret = put_user(tmp, (unsigned long *) 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 (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
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break;
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if (access_process_vm(child, addr, &data, sizeof(data), 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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ret = 0;
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switch (addr >> 2) {
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case 0 ... PT__END-1:
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ret = put_reg(child, addr >> 2, data);
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break;
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default:
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ret = -EIO;
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break;
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}
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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 (!valid_signal(data))
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break;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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ptrace_disable(child);
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wake_up_process(child);
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ret = 0;
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break;
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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->exit_code = SIGKILL;
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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ptrace_disable(child);
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wake_up_process(child);
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break;
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case PTRACE_SINGLESTEP: /* set the trap flag. */
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ret = -EIO;
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if (!valid_signal(data))
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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ptrace_enable(child);
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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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case PTRACE_DETACH: /* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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break;
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case PTRACE_GETREGS: { /* Get all integer regs from the child. */
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int i;
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for (i = 0; i < PT__GPEND; i++) {
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tmp = get_reg(child, i);
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if (put_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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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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case PTRACE_SETREGS: { /* Set all integer regs in the child. */
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int i;
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for (i = 0; i < PT__GPEND; i++) {
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if (get_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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put_reg(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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case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
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ret = 0;
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if (copy_to_user((void *) data,
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&child->thread.user->f,
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sizeof(child->thread.user->f)))
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ret = -EFAULT;
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break;
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}
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case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
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ret = 0;
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if (copy_from_user(&child->thread.user->f,
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(void *) data,
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sizeof(child->thread.user->f)))
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ret = -EFAULT;
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break;
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}
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case PTRACE_GETFDPIC:
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tmp = 0;
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switch (addr) {
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case PTRACE_GETFDPIC_EXEC:
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tmp = child->mm->context.exec_fdpic_loadmap;
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break;
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case PTRACE_GETFDPIC_INTERP:
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tmp = child->mm->context.interp_fdpic_loadmap;
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break;
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default:
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break;
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}
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ret = 0;
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if (put_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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break;
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default:
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ret = -EIO;
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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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int __nongprelbss kstrace;
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static const struct {
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const char *name;
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unsigned argmask;
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} __syscall_name_table[NR_syscalls] = {
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[0] = { "restart_syscall" },
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[1] = { "exit", 0x000001 },
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[2] = { "fork", 0xffffff },
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[3] = { "read", 0x000141 },
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[4] = { "write", 0x000141 },
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[5] = { "open", 0x000235 },
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[6] = { "close", 0x000001 },
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[7] = { "waitpid", 0x000141 },
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[8] = { "creat", 0x000025 },
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[9] = { "link", 0x000055 },
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[10] = { "unlink", 0x000005 },
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[11] = { "execve", 0x000445 },
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[12] = { "chdir", 0x000005 },
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[13] = { "time", 0x000004 },
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[14] = { "mknod", 0x000325 },
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[15] = { "chmod", 0x000025 },
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[16] = { "lchown", 0x000025 },
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[17] = { "break" },
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[18] = { "oldstat", 0x000045 },
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[19] = { "lseek", 0x000131 },
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[20] = { "getpid", 0xffffff },
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[21] = { "mount", 0x043555 },
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[22] = { "umount", 0x000005 },
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[23] = { "setuid", 0x000001 },
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[24] = { "getuid", 0xffffff },
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[25] = { "stime", 0x000004 },
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[26] = { "ptrace", 0x004413 },
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[27] = { "alarm", 0x000001 },
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[28] = { "oldfstat", 0x000041 },
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[29] = { "pause", 0xffffff },
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[30] = { "utime", 0x000045 },
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[31] = { "stty" },
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[32] = { "gtty" },
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[33] = { "access", 0x000025 },
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[34] = { "nice", 0x000001 },
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[35] = { "ftime" },
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[36] = { "sync", 0xffffff },
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[37] = { "kill", 0x000011 },
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[38] = { "rename", 0x000055 },
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[39] = { "mkdir", 0x000025 },
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[40] = { "rmdir", 0x000005 },
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[41] = { "dup", 0x000001 },
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[42] = { "pipe", 0x000004 },
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[43] = { "times", 0x000004 },
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[44] = { "prof" },
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[45] = { "brk", 0x000004 },
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[46] = { "setgid", 0x000001 },
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[47] = { "getgid", 0xffffff },
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[48] = { "signal", 0x000041 },
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[49] = { "geteuid", 0xffffff },
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[50] = { "getegid", 0xffffff },
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[51] = { "acct", 0x000005 },
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[52] = { "umount2", 0x000035 },
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[53] = { "lock" },
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[54] = { "ioctl", 0x000331 },
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[55] = { "fcntl", 0x000331 },
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[56] = { "mpx" },
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[57] = { "setpgid", 0x000011 },
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[58] = { "ulimit" },
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[60] = { "umask", 0x000002 },
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[61] = { "chroot", 0x000005 },
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[62] = { "ustat", 0x000043 },
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[63] = { "dup2", 0x000011 },
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[64] = { "getppid", 0xffffff },
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[65] = { "getpgrp", 0xffffff },
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[66] = { "setsid", 0xffffff },
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[67] = { "sigaction" },
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[68] = { "sgetmask" },
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[69] = { "ssetmask" },
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[70] = { "setreuid" },
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[71] = { "setregid" },
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[72] = { "sigsuspend" },
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[73] = { "sigpending" },
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[74] = { "sethostname" },
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[75] = { "setrlimit" },
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[76] = { "getrlimit" },
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[77] = { "getrusage" },
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[78] = { "gettimeofday" },
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[79] = { "settimeofday" },
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[80] = { "getgroups" },
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[81] = { "setgroups" },
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[82] = { "select" },
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[83] = { "symlink" },
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[84] = { "oldlstat" },
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[85] = { "readlink" },
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[86] = { "uselib" },
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[87] = { "swapon" },
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[88] = { "reboot" },
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[89] = { "readdir" },
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[91] = { "munmap", 0x000034 },
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[92] = { "truncate" },
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[93] = { "ftruncate" },
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[94] = { "fchmod" },
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[95] = { "fchown" },
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[96] = { "getpriority" },
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[97] = { "setpriority" },
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[99] = { "statfs" },
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[100] = { "fstatfs" },
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[102] = { "socketcall" },
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[103] = { "syslog" },
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[104] = { "setitimer" },
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[105] = { "getitimer" },
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[106] = { "stat" },
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[107] = { "lstat" },
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|
[108] = { "fstat" },
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[111] = { "vhangup" },
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|
[114] = { "wait4" },
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|
[115] = { "swapoff" },
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|
[116] = { "sysinfo" },
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|
[117] = { "ipc" },
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|
[118] = { "fsync" },
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|
[119] = { "sigreturn" },
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|
[120] = { "clone" },
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|
[121] = { "setdomainname" },
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|
[122] = { "uname" },
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[123] = { "modify_ldt" },
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[123] = { "cacheflush" },
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[124] = { "adjtimex" },
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[125] = { "mprotect" },
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[126] = { "sigprocmask" },
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[127] = { "create_module" },
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[128] = { "init_module" },
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[129] = { "delete_module" },
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[130] = { "get_kernel_syms" },
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[131] = { "quotactl" },
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[132] = { "getpgid" },
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[133] = { "fchdir" },
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[134] = { "bdflush" },
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[135] = { "sysfs" },
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[136] = { "personality" },
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[137] = { "afs_syscall" },
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[138] = { "setfsuid" },
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[139] = { "setfsgid" },
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[140] = { "_llseek", 0x014331 },
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[141] = { "getdents" },
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[142] = { "_newselect", 0x000141 },
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[143] = { "flock" },
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[144] = { "msync" },
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[145] = { "readv" },
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[146] = { "writev" },
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[147] = { "getsid", 0x000001 },
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[148] = { "fdatasync", 0x000001 },
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[149] = { "_sysctl", 0x000004 },
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|
[150] = { "mlock" },
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|
[151] = { "munlock" },
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|
[152] = { "mlockall" },
|
|
[153] = { "munlockall" },
|
|
[154] = { "sched_setparam" },
|
|
[155] = { "sched_getparam" },
|
|
[156] = { "sched_setscheduler" },
|
|
[157] = { "sched_getscheduler" },
|
|
[158] = { "sched_yield" },
|
|
[159] = { "sched_get_priority_max" },
|
|
[160] = { "sched_get_priority_min" },
|
|
[161] = { "sched_rr_get_interval" },
|
|
[162] = { "nanosleep", 0x000044 },
|
|
[163] = { "mremap" },
|
|
[164] = { "setresuid" },
|
|
[165] = { "getresuid" },
|
|
[166] = { "vm86" },
|
|
[167] = { "query_module" },
|
|
[168] = { "poll" },
|
|
[169] = { "nfsservctl" },
|
|
[170] = { "setresgid" },
|
|
[171] = { "getresgid" },
|
|
[172] = { "prctl", 0x333331 },
|
|
[173] = { "rt_sigreturn", 0xffffff },
|
|
[174] = { "rt_sigaction", 0x001441 },
|
|
[175] = { "rt_sigprocmask", 0x001441 },
|
|
[176] = { "rt_sigpending", 0x000014 },
|
|
[177] = { "rt_sigtimedwait", 0x001444 },
|
|
[178] = { "rt_sigqueueinfo", 0x000411 },
|
|
[179] = { "rt_sigsuspend", 0x000014 },
|
|
[180] = { "pread", 0x003341 },
|
|
[181] = { "pwrite", 0x003341 },
|
|
[182] = { "chown", 0x000115 },
|
|
[183] = { "getcwd" },
|
|
[184] = { "capget" },
|
|
[185] = { "capset" },
|
|
[186] = { "sigaltstack" },
|
|
[187] = { "sendfile" },
|
|
[188] = { "getpmsg" },
|
|
[189] = { "putpmsg" },
|
|
[190] = { "vfork", 0xffffff },
|
|
[191] = { "ugetrlimit" },
|
|
[192] = { "mmap2", 0x313314 },
|
|
[193] = { "truncate64" },
|
|
[194] = { "ftruncate64" },
|
|
[195] = { "stat64", 0x000045 },
|
|
[196] = { "lstat64", 0x000045 },
|
|
[197] = { "fstat64", 0x000041 },
|
|
[198] = { "lchown32" },
|
|
[199] = { "getuid32", 0xffffff },
|
|
[200] = { "getgid32", 0xffffff },
|
|
[201] = { "geteuid32", 0xffffff },
|
|
[202] = { "getegid32", 0xffffff },
|
|
[203] = { "setreuid32" },
|
|
[204] = { "setregid32" },
|
|
[205] = { "getgroups32" },
|
|
[206] = { "setgroups32" },
|
|
[207] = { "fchown32" },
|
|
[208] = { "setresuid32" },
|
|
[209] = { "getresuid32" },
|
|
[210] = { "setresgid32" },
|
|
[211] = { "getresgid32" },
|
|
[212] = { "chown32" },
|
|
[213] = { "setuid32" },
|
|
[214] = { "setgid32" },
|
|
[215] = { "setfsuid32" },
|
|
[216] = { "setfsgid32" },
|
|
[217] = { "pivot_root" },
|
|
[218] = { "mincore" },
|
|
[219] = { "madvise" },
|
|
[220] = { "getdents64" },
|
|
[221] = { "fcntl64" },
|
|
[223] = { "security" },
|
|
[224] = { "gettid" },
|
|
[225] = { "readahead" },
|
|
[226] = { "setxattr" },
|
|
[227] = { "lsetxattr" },
|
|
[228] = { "fsetxattr" },
|
|
[229] = { "getxattr" },
|
|
[230] = { "lgetxattr" },
|
|
[231] = { "fgetxattr" },
|
|
[232] = { "listxattr" },
|
|
[233] = { "llistxattr" },
|
|
[234] = { "flistxattr" },
|
|
[235] = { "removexattr" },
|
|
[236] = { "lremovexattr" },
|
|
[237] = { "fremovexattr" },
|
|
[238] = { "tkill" },
|
|
[239] = { "sendfile64" },
|
|
[240] = { "futex" },
|
|
[241] = { "sched_setaffinity" },
|
|
[242] = { "sched_getaffinity" },
|
|
[243] = { "set_thread_area" },
|
|
[244] = { "get_thread_area" },
|
|
[245] = { "io_setup" },
|
|
[246] = { "io_destroy" },
|
|
[247] = { "io_getevents" },
|
|
[248] = { "io_submit" },
|
|
[249] = { "io_cancel" },
|
|
[250] = { "fadvise64" },
|
|
[252] = { "exit_group", 0x000001 },
|
|
[253] = { "lookup_dcookie" },
|
|
[254] = { "epoll_create" },
|
|
[255] = { "epoll_ctl" },
|
|
[256] = { "epoll_wait" },
|
|
[257] = { "remap_file_pages" },
|
|
[258] = { "set_tid_address" },
|
|
[259] = { "timer_create" },
|
|
[260] = { "timer_settime" },
|
|
[261] = { "timer_gettime" },
|
|
[262] = { "timer_getoverrun" },
|
|
[263] = { "timer_delete" },
|
|
[264] = { "clock_settime" },
|
|
[265] = { "clock_gettime" },
|
|
[266] = { "clock_getres" },
|
|
[267] = { "clock_nanosleep" },
|
|
[268] = { "statfs64" },
|
|
[269] = { "fstatfs64" },
|
|
[270] = { "tgkill" },
|
|
[271] = { "utimes" },
|
|
[272] = { "fadvise64_64" },
|
|
[273] = { "vserver" },
|
|
[274] = { "mbind" },
|
|
[275] = { "get_mempolicy" },
|
|
[276] = { "set_mempolicy" },
|
|
[277] = { "mq_open" },
|
|
[278] = { "mq_unlink" },
|
|
[279] = { "mq_timedsend" },
|
|
[280] = { "mq_timedreceive" },
|
|
[281] = { "mq_notify" },
|
|
[282] = { "mq_getsetattr" },
|
|
[283] = { "sys_kexec_load" },
|
|
};
|
|
|
|
asmlinkage void do_syscall_trace(int leaving)
|
|
{
|
|
#if 0
|
|
unsigned long *argp;
|
|
const char *name;
|
|
unsigned argmask;
|
|
char buffer[16];
|
|
|
|
if (!kstrace)
|
|
return;
|
|
|
|
if (!current->mm)
|
|
return;
|
|
|
|
if (__frame->gr7 == __NR_close)
|
|
return;
|
|
|
|
#if 0
|
|
if (__frame->gr7 != __NR_mmap2 &&
|
|
__frame->gr7 != __NR_vfork &&
|
|
__frame->gr7 != __NR_execve &&
|
|
__frame->gr7 != __NR_exit)
|
|
return;
|
|
#endif
|
|
|
|
argmask = 0;
|
|
name = NULL;
|
|
if (__frame->gr7 < NR_syscalls) {
|
|
name = __syscall_name_table[__frame->gr7].name;
|
|
argmask = __syscall_name_table[__frame->gr7].argmask;
|
|
}
|
|
if (!name) {
|
|
sprintf(buffer, "sys_%lx", __frame->gr7);
|
|
name = buffer;
|
|
}
|
|
|
|
if (!leaving) {
|
|
if (!argmask) {
|
|
printk(KERN_CRIT "[%d] %s(%lx,%lx,%lx,%lx,%lx,%lx)\n",
|
|
current->pid,
|
|
name,
|
|
__frame->gr8,
|
|
__frame->gr9,
|
|
__frame->gr10,
|
|
__frame->gr11,
|
|
__frame->gr12,
|
|
__frame->gr13);
|
|
}
|
|
else if (argmask == 0xffffff) {
|
|
printk(KERN_CRIT "[%d] %s()\n",
|
|
current->pid,
|
|
name);
|
|
}
|
|
else {
|
|
printk(KERN_CRIT "[%d] %s(",
|
|
current->pid,
|
|
name);
|
|
|
|
argp = &__frame->gr8;
|
|
|
|
do {
|
|
switch (argmask & 0xf) {
|
|
case 1:
|
|
printk("%ld", (long) *argp);
|
|
break;
|
|
case 2:
|
|
printk("%lo", *argp);
|
|
break;
|
|
case 3:
|
|
printk("%lx", *argp);
|
|
break;
|
|
case 4:
|
|
printk("%p", (void *) *argp);
|
|
break;
|
|
case 5:
|
|
printk("\"%s\"", (char *) *argp);
|
|
break;
|
|
}
|
|
|
|
argp++;
|
|
argmask >>= 4;
|
|
if (argmask)
|
|
printk(",");
|
|
|
|
} while (argmask);
|
|
|
|
printk(")\n");
|
|
}
|
|
}
|
|
else {
|
|
if ((int)__frame->gr8 > -4096 && (int)__frame->gr8 < 4096)
|
|
printk(KERN_CRIT "[%d] %s() = %ld\n", current->pid, name, __frame->gr8);
|
|
else
|
|
printk(KERN_CRIT "[%d] %s() = %lx\n", current->pid, name, __frame->gr8);
|
|
}
|
|
return;
|
|
#endif
|
|
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
return;
|
|
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
return;
|
|
|
|
/* we need to indicate entry or exit to strace */
|
|
if (leaving)
|
|
__frame->__status |= REG__STATUS_SYSC_EXIT;
|
|
else
|
|
__frame->__status |= REG__STATUS_SYSC_ENTRY;
|
|
|
|
ptrace_notify(SIGTRAP);
|
|
|
|
/*
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
* for normal use. strace only continues with a signal if the
|
|
* stopping signal is not SIGTRAP. -brl
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|