db_usrreq.c

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    1 /*      $OpenBSD: db_usrreq.c,v 1.22 2021/01/09 20:58:12 gnezdo Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1996 Michael Shalayeff.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/param.h>
   28 #include <sys/systm.h>
   29 #include <sys/proc.h>
   30 #include <sys/tty.h>
   31 #include <sys/sysctl.h>
   32 #include <dev/cons.h>
   33 
   34 #include <ddb/db_var.h>
   35 
   36 int     db_log = 1;
   37 int     db_profile;                     /* Allow dynamic profiling */
   38 
   39 const struct sysctl_bounded_args ddb_vars[] = {
   40         { DBCTL_RADIX, &db_radix, 8, 16 },
   41         { DBCTL_MAXWIDTH, &db_max_width, 0, INT_MAX },
   42         { DBCTL_TABSTOP, &db_tab_stop_width, 1, 16 },
   43         { DBCTL_MAXLINE, &db_max_line, 0, INT_MAX },
   44         { DBCTL_LOG, &db_log, 0, 1 },
   45 };
   46 
   47 int
   48 ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
   49     size_t newlen, struct proc *p)
   50 {
   51         /* All sysctl names at this level are terminal. */
   52         if (namelen != 1)
   53                 return (ENOTDIR);
   54 
   55         switch (name[0]) {
   56         case DBCTL_PANIC:
   57                 if (securelevel > 0)
   58                         return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
   59                             &db_panic));
   60                 else {
   61                         return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
   62                             &db_panic, 0, 1));
   63                 }
   64                 break;
   65         case DBCTL_CONSOLE:
   66                 if (securelevel > 0)
   67                         return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
   68                             &db_console));
   69                 else {
   70                         return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
   71                             &db_console, 0, 1));
   72                 }
   73                 break;
   74         case DBCTL_TRIGGER:
   75                 if (newp && db_console) {
   76                         struct process *pr = curproc->p_p;
   77 
   78                         if (securelevel < 1 ||
   79                             (pr->ps_flags & PS_CONTROLT && cn_tab &&
   80                             cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) {
   81                                 db_enter();
   82                                 newp = NULL;
   83                         } else
   84                                 return (ENODEV);
   85                 }
   86                 return (sysctl_rdint(oldp, oldlenp, newp, 0));
   87 #if defined(DDBPROF)
   88         case DBCTL_PROFILE:
   89                 if (securelevel > 0)
   90                         return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
   91                             &db_profile));
   92                 else {
   93                         return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
   94                             &db_profile, 0, 1));
   95                 }
   96                 break;
   97 #endif /* DDBPROF */
   98         default:
   99                 return (sysctl_bounded_arr(ddb_vars, nitems(ddb_vars), name,
  100                     namelen, oldp, oldlenp, newp, newlen));
  101         }
  102         /* NOTREACHED */
  103 }

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_usrreq.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_usrreq.c