FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_ptrace.c

     /*      $NetBSD: sys_ptrace.c,v 1.12 2022/07/10 14:07:55 riastradh Exp $        */
     
     /*-
      * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Andrew Doran.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*-
     * Copyright (c) 1982, 1986, 1989, 1993
     *      The Regents of the University of California.  All rights reserved.
     * (c) UNIX System Laboratories, Inc.
     * All or some portions of this file are derived from material licensed
     * to the University of California by American Telephone and Telegraph
     * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * This code is derived from software contributed to Berkeley by
     * Jan-Simon Pendry.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: sys_ptrace.c,v 1.12 2022/07/10 14:07:55 riastradh Exp $");
    
    #ifdef _KERNEL_OPT
    #include "opt_ptrace.h"
    #endif
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/errno.h>
    #include <sys/exec.h>
    #include <sys/pax.h>
    #include <sys/ptrace.h>
    #include <sys/uio.h>
    #include <sys/ras.h>
    #include <sys/kmem.h>
    #include <sys/kauth.h>
    #include <sys/mount.h>
    #include <sys/syscallargs.h>
    #include <sys/syscallvar.h>
    #include <sys/syscall.h>
    #include <sys/module.h>
    
    #include <uvm/uvm_extern.h>
    
    #include <machine/reg.h>
    
    /*
    * PTRACE methods
    */
   
   static int
   ptrace_copyin_piod(struct ptrace_io_desc *piod, const void *addr, size_t len)
   {
           if (len != 0 && sizeof(*piod) != len)
                   return EINVAL;
   
           return copyin(addr, piod, sizeof(*piod));
   }
   
   static int
   ptrace_copyout_piod(const struct ptrace_io_desc *piod, void *addr, size_t len)
   {
           if (len != 0 && sizeof(*piod) != len)
                   return EINVAL;
   
           return copyout(piod, addr, sizeof(*piod));
   }
   
   static int
   ptrace_copyin_siginfo(struct ptrace_siginfo *psi, const void *addr, size_t len)
   {
           if (sizeof(*psi) != len)
                   return EINVAL;
   
           return copyin(addr, psi, sizeof(*psi));
   }
   
   static int
   ptrace_copyout_siginfo(const struct ptrace_siginfo *psi, void *addr, size_t len)
   {
           if (sizeof(*psi) != len)
                   return EINVAL;
   
           return copyout(psi, addr, sizeof(*psi));
   }
   
   static int
   ptrace_copyout_lwpstatus(const struct ptrace_lwpstatus *pls, void *addr,
       size_t len)
   {
   
           return copyout(pls, addr, len);
   }
   
   static struct ptrace_methods native_ptm = {
           .ptm_copyin_piod = ptrace_copyin_piod,
           .ptm_copyout_piod = ptrace_copyout_piod,
           .ptm_copyin_siginfo = ptrace_copyin_siginfo,
           .ptm_copyout_siginfo = ptrace_copyout_siginfo,
           .ptm_copyout_lwpstatus = ptrace_copyout_lwpstatus,
           .ptm_doregs = process_doregs,
           .ptm_dofpregs = process_dofpregs,
           .ptm_dodbregs = process_dodbregs,
   };
   
   static const struct syscall_package ptrace_syscalls[] = {
           { SYS_ptrace, 0, (sy_call_t *)sys_ptrace },
           { 0, 0, NULL },
   };
   
   /*
    * Process debugging system call.
    */
   int
   sys_ptrace(struct lwp *l, const struct sys_ptrace_args *uap, register_t *retval)
   {
           /* {
                   syscallarg(int) req;
                   syscallarg(pid_t) pid;
                   syscallarg(void *) addr;
                   syscallarg(int) data;
           } */
   
           return do_ptrace(&native_ptm, l, SCARG(uap, req), SCARG(uap, pid),
               SCARG(uap, addr), SCARG(uap, data), retval);
   }
   
   #define DEPS    "ptrace_common"
   
   MODULE(MODULE_CLASS_EXEC, ptrace, DEPS);
   
   static int
   ptrace_init(void)
   {
           int error;
   
           error = syscall_establish(&emul_netbsd, ptrace_syscalls);
           return error;
   }
   
   static int
   ptrace_fini(void)
   {
           int error;
   
           error = syscall_disestablish(&emul_netbsd, ptrace_syscalls);
           return error;
   }
   
   
   static int
   ptrace_modcmd(modcmd_t cmd, void *arg)
   {
           int error;
   
           switch (cmd) {
           case MODULE_CMD_INIT:
                   error = ptrace_init();
                   break;
           case MODULE_CMD_FINI:
                   error = ptrace_fini();
                   break;
           default:
                   error = ENOTTY;
                   break;
           }
           return error;
   }

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