add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/lib/ubsan.c
..
..
@@ -1,13 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
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2
 /*
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  * UBSAN error reporting functions
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  *
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  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
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  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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7
  */
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8
 
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9
 #include <linux/bitops.h>
..
..
@@ -17,6 +13,7 @@
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13
 #include <linux/kernel.h>
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14
 #include <linux/types.h>
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15
 #include <linux/sched.h>
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+#include <linux/uaccess.h>
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17
 
21
18
 #include "ubsan.h"
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19
 
..
..
@@ -46,13 +43,6 @@
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 static bool was_reported(struct source_location *location)
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44
 {
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45
 	return test_and_set_bit(REPORTED_BIT, &location->reported);
49
-}
50
-
51
-static void print_source_location(const char *prefix,
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-				struct source_location *loc)
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-{
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-	pr_err("%s %s:%d:%d\n", prefix, loc->file_name,
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-		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
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46
 }
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47
 
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 static bool suppress_report(struct source_location *loc)
..
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@@ -122,7 +112,7 @@
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 {
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113
 	if (type_is_int(type)) {
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114
 		if (type_bit_width(type) == 128) {
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-#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
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+#if defined(CONFIG_ARCH_SUPPORTS_INT128)
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 			u_max val = get_unsigned_val(type, value);
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117
 
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 			scnprintf(str, size, "0x%08x%08x%08x%08x",
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..
@@ -143,108 +133,36 @@
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133
 	}
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134
 }
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135
 
146
-static DEFINE_SPINLOCK(report_lock);
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-
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-static void ubsan_prologue(struct source_location *location,
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-			unsigned long *flags)
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+static void ubsan_prologue(struct source_location *loc, const char *reason)
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137
 {
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 	current->in_ubsan++;
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-	spin_lock_irqsave(&report_lock, *flags);
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139
 
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 	pr_err("========================================"
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 		"========================================\n");
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-	print_source_location("UBSAN: Undefined behaviour in", location);
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+	pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name,
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+		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
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144
 }
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145
 
159
-static void ubsan_epilogue(unsigned long *flags)
146
+static void ubsan_epilogue(void)
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147
 {
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148
 	dump_stack();
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149
 	pr_err("========================================"
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150
 		"========================================\n");
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-	spin_unlock_irqrestore(&report_lock, *flags);
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+
165
152
 	current->in_ubsan--;
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+
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+	check_panic_on_warn("UBSAN");
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155
 }
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156
 
168
-static void handle_overflow(struct overflow_data *data, void *lhs,
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-			void *rhs, char op)
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+void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
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158
 {
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-
172
-	struct type_descriptor *type = data->type;
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-	unsigned long flags;
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-	char lhs_val_str[VALUE_LENGTH];
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+	struct overflow_data *data = _data;
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160
 	char rhs_val_str[VALUE_LENGTH];
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161
 
177
162
 	if (suppress_report(&data->location))
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163
 		return;
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164
 
180
-	ubsan_prologue(&data->location, &flags);
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-
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-	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
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-	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
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-	pr_err("%s integer overflow:\n",
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-		type_is_signed(type) ? "signed" : "unsigned");
186
-	pr_err("%s %c %s cannot be represented in type %s\n",
187
-		lhs_val_str,
188
-		op,
189
-		rhs_val_str,
190
-		type->type_name);
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-
192
-	ubsan_epilogue(&flags);
193
-}
194
-
195
-void __ubsan_handle_add_overflow(struct overflow_data *data,
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-				void *lhs, void *rhs)
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-{
198
-
199
-	handle_overflow(data, lhs, rhs, '+');
200
-}
201
-EXPORT_SYMBOL(__ubsan_handle_add_overflow);
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-
203
-void __ubsan_handle_sub_overflow(struct overflow_data *data,
204
-				void *lhs, void *rhs)
205
-{
206
-	handle_overflow(data, lhs, rhs, '-');
207
-}
208
-EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
209
-
210
-void __ubsan_handle_mul_overflow(struct overflow_data *data,
211
-				void *lhs, void *rhs)
212
-{
213
-	handle_overflow(data, lhs, rhs, '*');
214
-}
215
-EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
216
-
217
-void __ubsan_handle_negate_overflow(struct overflow_data *data,
218
-				void *old_val)
219
-{
220
-	unsigned long flags;
221
-	char old_val_str[VALUE_LENGTH];
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-
223
-	if (suppress_report(&data->location))
224
-		return;
225
-
226
-	ubsan_prologue(&data->location, &flags);
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-
228
-	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
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-
230
-	pr_err("negation of %s cannot be represented in type %s:\n",
231
-		old_val_str, data->type->type_name);
232
-
233
-	ubsan_epilogue(&flags);
234
-}
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-EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
236
-
237
-
238
-void __ubsan_handle_divrem_overflow(struct overflow_data *data,
239
-				void *lhs, void *rhs)
240
-{
241
-	unsigned long flags;
242
-	char rhs_val_str[VALUE_LENGTH];
243
-
244
-	if (suppress_report(&data->location))
245
-		return;
246
-
247
-	ubsan_prologue(&data->location, &flags);
165
+	ubsan_prologue(&data->location, "division-overflow");
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166
 
249
167
 	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
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168
 
..
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@@ -254,63 +172,58 @@
254
172
 	else
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173
 		pr_err("division by zero\n");
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174
 
257
-	ubsan_epilogue(&flags);
175
+	ubsan_epilogue();
258
176
 }
259
177
 EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
260
178
 
261
179
 static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
262
180
 {
263
-	unsigned long flags;
264
-
265
181
 	if (suppress_report(data->location))
266
182
 		return;
267
183
 
268
-	ubsan_prologue(data->location, &flags);
184
+	ubsan_prologue(data->location, "null-ptr-deref");
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185
 
270
186
 	pr_err("%s null pointer of type %s\n",
271
187
 		type_check_kinds[data->type_check_kind],
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188
 		data->type->type_name);
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189
 
274
-	ubsan_epilogue(&flags);
190
+	ubsan_epilogue();
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191
 }
276
192
 
277
193
 static void handle_misaligned_access(struct type_mismatch_data_common *data,
278
194
 				unsigned long ptr)
279
195
 {
280
-	unsigned long flags;
281
-
282
196
 	if (suppress_report(data->location))
283
197
 		return;
284
198
 
285
-	ubsan_prologue(data->location, &flags);
199
+	ubsan_prologue(data->location, "misaligned-access");
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200
 
287
201
 	pr_err("%s misaligned address %p for type %s\n",
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202
 		type_check_kinds[data->type_check_kind],
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203
 		(void *)ptr, data->type->type_name);
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204
 	pr_err("which requires %ld byte alignment\n", data->alignment);
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205
 
292
-	ubsan_epilogue(&flags);
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+	ubsan_epilogue();
293
207
 }
294
208
 
295
209
 static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
296
210
 					unsigned long ptr)
297
211
 {
298
-	unsigned long flags;
299
-
300
212
 	if (suppress_report(data->location))
301
213
 		return;
302
214
 
303
-	ubsan_prologue(data->location, &flags);
215
+	ubsan_prologue(data->location, "object-size-mismatch");
304
216
 	pr_err("%s address %p with insufficient space\n",
305
217
 		type_check_kinds[data->type_check_kind],
306
218
 		(void *) ptr);
307
219
 	pr_err("for an object of type %s\n", data->type->type_name);
308
-	ubsan_epilogue(&flags);
220
+	ubsan_epilogue();
309
221
 }
310
222
 
311
223
 static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
312
224
 				unsigned long ptr)
313
225
 {
226
+	unsigned long flags = user_access_save();
314
227
 
315
228
 	if (!ptr)
316
229
 		handle_null_ptr_deref(data);
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..
@@ -318,6 +231,8 @@
318
231
 		handle_misaligned_access(data, ptr);
319
232
 	else
320
233
 		handle_object_size_mismatch(data, ptr);
234
+
235
+	user_access_restore(flags);
321
236
 }
322
237
 
323
238
 void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
..
..
@@ -334,10 +249,9 @@
334
249
 }
335
250
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
336
251
 
337
-void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
338
-				void *ptr)
252
+void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
339
253
 {
340
-
254
+	struct type_mismatch_data_v1 *data = _data;
341
255
 	struct type_mismatch_data_common common_data = {
342
256
 		.location = &data->location,
343
257
 		.type = data->type,
..
..
@@ -349,54 +263,36 @@
349
263
 }
350
264
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
351
265
 
352
-void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
353
-					void *bound)
266
+void __ubsan_handle_out_of_bounds(void *_data, void *index)
354
267
 {
355
-	unsigned long flags;
356
-	char bound_str[VALUE_LENGTH];
357
-
358
-	if (suppress_report(&data->location))
359
-		return;
360
-
361
-	ubsan_prologue(&data->location, &flags);
362
-
363
-	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
364
-	pr_err("variable length array bound value %s <= 0\n", bound_str);
365
-
366
-	ubsan_epilogue(&flags);
367
-}
368
-EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
369
-
370
-void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
371
-{
372
-	unsigned long flags;
268
+	struct out_of_bounds_data *data = _data;
373
269
 	char index_str[VALUE_LENGTH];
374
270
 
375
271
 	if (suppress_report(&data->location))
376
272
 		return;
377
273
 
378
-	ubsan_prologue(&data->location, &flags);
274
+	ubsan_prologue(&data->location, "array-index-out-of-bounds");
379
275
 
380
276
 	val_to_string(index_str, sizeof(index_str), data->index_type, index);
381
277
 	pr_err("index %s is out of range for type %s\n", index_str,
382
278
 		data->array_type->type_name);
383
-	ubsan_epilogue(&flags);
279
+	ubsan_epilogue();
384
280
 }
385
281
 EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
386
282
 
387
-void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
388
-					void *lhs, void *rhs)
283
+void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
389
284
 {
390
-	unsigned long flags;
285
+	struct shift_out_of_bounds_data *data = _data;
391
286
 	struct type_descriptor *rhs_type = data->rhs_type;
392
287
 	struct type_descriptor *lhs_type = data->lhs_type;
393
288
 	char rhs_str[VALUE_LENGTH];
394
289
 	char lhs_str[VALUE_LENGTH];
290
+	unsigned long ua_flags = user_access_save();
395
291
 
396
292
 	if (suppress_report(&data->location))
397
-		return;
293
+		goto out;
398
294
 
399
-	ubsan_prologue(&data->location, &flags);
295
+	ubsan_prologue(&data->location, "shift-out-of-bounds");
400
296
 
401
297
 	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
402
298
 	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
..
..
@@ -419,38 +315,69 @@
419
315
 			lhs_str, rhs_str,
420
316
 			lhs_type->type_name);
421
317
 
422
-	ubsan_epilogue(&flags);
318
+	ubsan_epilogue();
319
+out:
320
+	user_access_restore(ua_flags);
423
321
 }
424
322
 EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
425
323
 
426
324
 
427
-void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
325
+void __ubsan_handle_builtin_unreachable(void *_data)
428
326
 {
429
-	unsigned long flags;
430
-
431
-	ubsan_prologue(&data->location, &flags);
327
+	struct unreachable_data *data = _data;
328
+	ubsan_prologue(&data->location, "unreachable");
432
329
 	pr_err("calling __builtin_unreachable()\n");
433
-	ubsan_epilogue(&flags);
330
+	ubsan_epilogue();
434
331
 	panic("can't return from __builtin_unreachable()");
435
332
 }
436
333
 EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
437
334
 
438
-void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
439
-				void *val)
335
+void __ubsan_handle_load_invalid_value(void *_data, void *val)
440
336
 {
441
-	unsigned long flags;
337
+	struct invalid_value_data *data = _data;
442
338
 	char val_str[VALUE_LENGTH];
443
339
 
444
340
 	if (suppress_report(&data->location))
445
341
 		return;
446
342
 
447
-	ubsan_prologue(&data->location, &flags);
343
+	ubsan_prologue(&data->location, "invalid-load");
448
344
 
449
345
 	val_to_string(val_str, sizeof(val_str), data->type, val);
450
346
 
451
347
 	pr_err("load of value %s is not a valid value for type %s\n",
452
348
 		val_str, data->type->type_name);
453
349
 
454
-	ubsan_epilogue(&flags);
350
+	ubsan_epilogue();
455
351
 }
456
352
 EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
353
+
354
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
355
+					 unsigned long align,
356
+					 unsigned long offset);
357
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
358
+					 unsigned long align,
359
+					 unsigned long offset)
360
+{
361
+	struct alignment_assumption_data *data = _data;
362
+	unsigned long real_ptr;
363
+
364
+	if (suppress_report(&data->location))
365
+		return;
366
+
367
+	ubsan_prologue(&data->location, "alignment-assumption");
368
+
369
+	if (offset)
370
+		pr_err("assumption of %lu byte alignment (with offset of %lu byte) for pointer of type %s failed",
371
+		       align, offset, data->type->type_name);
372
+	else
373
+		pr_err("assumption of %lu byte alignment for pointer of type %s failed",
374
+		       align, data->type->type_name);
375
+
376
+	real_ptr = ptr - offset;
377
+	pr_err("%saddress is %lu aligned, misalignment offset is %lu bytes",
378
+	       offset ? "offset " : "", BIT(real_ptr ? __ffs(real_ptr) : 0),
379
+	       real_ptr & (align - 1));
380
+
381
+	ubsan_epilogue();
382
+}
383
+EXPORT_SYMBOL(__ubsan_handle_alignment_assumption);