check_cmn_err.c

   1 /*
   2  * Copyright (C) 2016 Oracle.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  *
  17  * Copyright 2019 Joyent, Inc.
  18  */
  19
  20 /*
  21  * Heavily borrowed from check_wine.c: what we're doing here is teaching smatch
  22  * that cmn_err(CE_PANIC, ...) is noreturn.
  23  */
  24
  25 #include "scope.h"
  26 #include "smatch.h"
  27 #include "smatch_extra.h"
  28
  29 #define CE_PANIC (3)
  30
  31 void match_cmn_err(const char *fn, struct expression *expr,
  32                         void *unused)
  33 {
  34         struct expression *arg;
  35         sval_t sval;
  36
  37         arg = get_argument_from_call_expr(expr->args, 0);
  38         if (!get_implied_value(arg, &sval))
  39                 return;
  40
  41         if (sval.value == CE_PANIC)
  42                 nullify_path();
  43 }
  44
  45
  46 void check_cmn_err(int id)
  47 {
  48         if (option_project != PROJ_ILLUMOS_KERNEL)
  49                 return;
  50
  51         add_function_hook("cmn_err", &match_cmn_err, NULL);
  52 }