2 * Copyright (C) 2018 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 #include "smatch_extra.h"
20
21 static int my_id;
22
23 static int suppress_multiple = 1;
24
25 static int is_write(struct expression *expr)
26 {
27 return 0;
28 }
29
30 static int is_read(struct expression *expr)
31 {
32 struct expression *parent, *last_parent;
33 struct statement *stmt;
34
35 if (is_write(expr))
36 return 0;
37
38 last_parent = expr;
39 while ((parent = expr_get_parent_expr(expr))){
40
41 last_parent = parent;
148 }
149
150 static void array_check(struct expression *expr)
151 {
152 struct expression_list *conditions;
153 struct expression *array_expr, *offset;
154 unsigned long long mask;
155 int array_size;
156 char *name;
157
158 expr = strip_expr(expr);
159 if (!is_array(expr))
160 return;
161
162 if (is_impossible_path())
163 return;
164 if (is_harmless(expr))
165 return;
166
167 array_expr = get_array_base(expr);
168 if (suppress_multiple && is_ignored_expr(my_id, array_expr))
169 return;
170
171 offset = get_array_offset(expr);
172 if (!is_user_rl(offset))
173 return;
174 if (is_nospec(offset))
175 return;
176
177 array_size = get_array_size(array_expr);
178 if (array_size > 0 && get_max_by_type(offset) < array_size)
179 return;
180 // binfo = get_bit_info(offset);
181 // if (array_size > 0 && binfo && binfo->possible < array_size)
182 // return;
183
184 mask = get_mask(offset);
185 if (mask <= array_size)
186 return;
187
188 conditions = get_conditions(offset);
189
190 name = expr_to_str(array_expr);
191 sm_warning("potential spectre issue '%s' [%s]%s",
192 name,
193 is_read(expr) ? "r" : "w",
194 conditions ? " (local cap)" : "");
195 if (suppress_multiple)
196 add_ignore_expr(my_id, array_expr);
197 free_string(name);
198 }
199
200 void check_spectre(int id)
201 {
202 my_id = id;
203
204 suppress_multiple = getenv("FULL_SPECTRE") == NULL;
205
206 if (option_project != PROJ_KERNEL)
207 return;
208
209 add_hook(&array_check, OP_HOOK);
210 }
|
2 * Copyright (C) 2018 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 #include "smatch_extra.h"
20
21 static int my_id;
22 extern int second_half_id;
23 extern void set_spectre_first_half(struct expression *expr);
24
25 static int suppress_multiple = 1;
26
27 static int is_write(struct expression *expr)
28 {
29 return 0;
30 }
31
32 static int is_read(struct expression *expr)
33 {
34 struct expression *parent, *last_parent;
35 struct statement *stmt;
36
37 if (is_write(expr))
38 return 0;
39
40 last_parent = expr;
41 while ((parent = expr_get_parent_expr(expr))){
42
43 last_parent = parent;
150 }
151
152 static void array_check(struct expression *expr)
153 {
154 struct expression_list *conditions;
155 struct expression *array_expr, *offset;
156 unsigned long long mask;
157 int array_size;
158 char *name;
159
160 expr = strip_expr(expr);
161 if (!is_array(expr))
162 return;
163
164 if (is_impossible_path())
165 return;
166 if (is_harmless(expr))
167 return;
168
169 array_expr = get_array_base(expr);
170 if (suppress_multiple && is_ignored_expr(my_id, array_expr)) {
171 set_spectre_first_half(expr);
172 return;
173 }
174
175 offset = get_array_offset(expr);
176 if (!is_user_rl(offset))
177 return;
178 if (is_nospec(offset))
179 return;
180
181 array_size = get_array_size(array_expr);
182 if (array_size > 0 && get_max_by_type(offset) < array_size)
183 return;
184 // binfo = get_bit_info(offset);
185 // if (array_size > 0 && binfo && binfo->possible < array_size)
186 // return;
187
188 mask = get_mask(offset);
189 if (mask <= array_size)
190 return;
191
192 conditions = get_conditions(offset);
193
194 name = expr_to_str(array_expr);
195 sm_warning("potential spectre issue '%s' [%s]%s",
196 name,
197 is_read(expr) ? "r" : "w",
198 conditions ? " (local cap)" : "");
199
200 set_spectre_first_half(expr);
201 if (suppress_multiple)
202 add_ignore_expr(my_id, array_expr);
203 free_string(name);
204 }
205
206 void check_spectre(int id)
207 {
208 my_id = id;
209
210 suppress_multiple = getenv("FULL_SPECTRE") == NULL;
211
212 if (option_project != PROJ_KERNEL)
213 return;
214
215 add_hook(&array_check, OP_HOOK);
216 }
|