check_kvmalloc_NOFS.c

   1 /*
   2  * Copyright (C) 2021 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
  18 #include "smatch.h"
  19
  20 static int my_id;
  21
  22 #define GFP_KERNEL_OLD 0x6000c0
  23 #define GFP_KERNEL 0xcc0
  24
  25 static void match_alloc(const char *fn, struct expression *expr, void *_arg)
  26 {
  27         int arg_nr = PTR_INT(_arg);
  28         struct expression *arg_expr;
  29         sval_t sval;
  30
  31         arg_expr = get_argument_from_call_expr(expr->args, arg_nr);
  32         if (!get_value(arg_expr, &sval))
  33                 return;
  34         if ((sval.uvalue & GFP_KERNEL) == GFP_KERNEL)
  35                 return;
  36         if ((sval.uvalue & GFP_KERNEL_OLD) == GFP_KERNEL_OLD)
  37                 return;
  38
  39         sm_error("kvmalloc() only makes sense with GFP_KERNEL");
  40 }
  41
  42 void check_kvmalloc_NOFS(int id)
  43 {
  44         if (option_project != PROJ_KERNEL)
  45                 return;
  46
  47         my_id = id;
  48
  49         add_function_hook("kvmalloc", &match_alloc, INT_PTR(1));
  50         add_function_hook("kvzalloc", &match_alloc, INT_PTR(1));
  51         add_function_hook("kvmalloc_array", &match_alloc, INT_PTR(2));
  52         add_function_hook("kvcalloc", &match_alloc, INT_PTR(2));
  53 }