kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/lib/ubsan.c
..
..
@@ -1,13 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * UBSAN error reporting functions
3
4
  *
4
5
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
5
6
  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
6
- *
7
- * This program is free software; you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License version 2 as
9
- * published by the Free Software Foundation.
10
- *
11
7
  */
12
8
 
13
9
 #include <linux/bitops.h>
..
..
@@ -17,6 +13,7 @@
17
13
 #include <linux/kernel.h>
18
14
 #include <linux/types.h>
19
15
 #include <linux/sched.h>
16
+#include <linux/uaccess.h>
20
17
 
21
18
 #include "ubsan.h"
22
19
 
..
..
@@ -46,13 +43,6 @@
46
43
 static bool was_reported(struct source_location *location)
47
44
 {
48
45
 	return test_and_set_bit(REPORTED_BIT, &location->reported);
49
-}
50
-
51
-static void print_source_location(const char *prefix,
52
-				struct source_location *loc)
53
-{
54
-	pr_err("%s %s:%d:%d\n", prefix, loc->file_name,
55
-		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
56
46
 }
57
47
 
58
48
 static bool suppress_report(struct source_location *loc)
..
..
@@ -122,7 +112,7 @@
122
112
 {
123
113
 	if (type_is_int(type)) {
124
114
 		if (type_bit_width(type) == 128) {
125
-#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
115
+#if defined(CONFIG_ARCH_SUPPORTS_INT128)
126
116
 			u_max val = get_unsigned_val(type, value);
127
117
 
128
118
 			scnprintf(str, size, "0x%08x%08x%08x%08x",
..
..
@@ -143,108 +133,45 @@
143
133
 	}
144
134
 }
145
135
 
146
-static DEFINE_SPINLOCK(report_lock);
147
-
148
-static void ubsan_prologue(struct source_location *location,
149
-			unsigned long *flags)
136
+static void ubsan_prologue(struct source_location *loc, const char *reason)
150
137
 {
151
138
 	current->in_ubsan++;
152
-	spin_lock_irqsave(&report_lock, *flags);
153
139
 
154
140
 	pr_err("========================================"
155
141
 		"========================================\n");
156
-	print_source_location("UBSAN: Undefined behaviour in", location);
142
+	pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name,
143
+		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
157
144
 }
158
145
 
159
-static void ubsan_epilogue(unsigned long *flags)
146
+static void ubsan_epilogue(void)
160
147
 {
161
148
 	dump_stack();
162
149
 	pr_err("========================================"
163
150
 		"========================================\n");
164
-	spin_unlock_irqrestore(&report_lock, *flags);
151
+
165
152
 	current->in_ubsan--;
153
+
154
+	if (panic_on_warn) {
155
+		/*
156
+		 * This thread may hit another WARN() in the panic path.
157
+		 * Resetting this prevents additional WARN() from panicking the
158
+		 * system on this thread.  Other threads are blocked by the
159
+		 * panic_mutex in panic().
160
+		 */
161
+		panic_on_warn = 0;
162
+		panic("panic_on_warn set ...\n");
163
+	}
166
164
 }
167
165
 
168
-static void handle_overflow(struct overflow_data *data, void *lhs,
169
-			void *rhs, char op)
166
+void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
170
167
 {
171
-
172
-	struct type_descriptor *type = data->type;
173
-	unsigned long flags;
174
-	char lhs_val_str[VALUE_LENGTH];
168
+	struct overflow_data *data = _data;
175
169
 	char rhs_val_str[VALUE_LENGTH];
176
170
 
177
171
 	if (suppress_report(&data->location))
178
172
 		return;
179
173
 
180
-	ubsan_prologue(&data->location, &flags);
181
-
182
-	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
183
-	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
184
-	pr_err("%s integer overflow:\n",
185
-		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);
191
-
192
-	ubsan_epilogue(&flags);
193
-}
194
-
195
-void __ubsan_handle_add_overflow(struct overflow_data *data,
196
-				void *lhs, void *rhs)
197
-{
198
-
199
-	handle_overflow(data, lhs, rhs, '+');
200
-}
201
-EXPORT_SYMBOL(__ubsan_handle_add_overflow);
202
-
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];
222
-
223
-	if (suppress_report(&data->location))
224
-		return;
225
-
226
-	ubsan_prologue(&data->location, &flags);
227
-
228
-	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
229
-
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
-}
235
-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);
174
+	ubsan_prologue(&data->location, "division-overflow");
248
175
 
249
176
 	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
250
177
 
..
..
@@ -254,63 +181,58 @@
254
181
 	else
255
182
 		pr_err("division by zero\n");
256
183
 
257
-	ubsan_epilogue(&flags);
184
+	ubsan_epilogue();
258
185
 }
259
186
 EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
260
187
 
261
188
 static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
262
189
 {
263
-	unsigned long flags;
264
-
265
190
 	if (suppress_report(data->location))
266
191
 		return;
267
192
 
268
-	ubsan_prologue(data->location, &flags);
193
+	ubsan_prologue(data->location, "null-ptr-deref");
269
194
 
270
195
 	pr_err("%s null pointer of type %s\n",
271
196
 		type_check_kinds[data->type_check_kind],
272
197
 		data->type->type_name);
273
198
 
274
-	ubsan_epilogue(&flags);
199
+	ubsan_epilogue();
275
200
 }
276
201
 
277
202
 static void handle_misaligned_access(struct type_mismatch_data_common *data,
278
203
 				unsigned long ptr)
279
204
 {
280
-	unsigned long flags;
281
-
282
205
 	if (suppress_report(data->location))
283
206
 		return;
284
207
 
285
-	ubsan_prologue(data->location, &flags);
208
+	ubsan_prologue(data->location, "misaligned-access");
286
209
 
287
210
 	pr_err("%s misaligned address %p for type %s\n",
288
211
 		type_check_kinds[data->type_check_kind],
289
212
 		(void *)ptr, data->type->type_name);
290
213
 	pr_err("which requires %ld byte alignment\n", data->alignment);
291
214
 
292
-	ubsan_epilogue(&flags);
215
+	ubsan_epilogue();
293
216
 }
294
217
 
295
218
 static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
296
219
 					unsigned long ptr)
297
220
 {
298
-	unsigned long flags;
299
-
300
221
 	if (suppress_report(data->location))
301
222
 		return;
302
223
 
303
-	ubsan_prologue(data->location, &flags);
224
+	ubsan_prologue(data->location, "object-size-mismatch");
304
225
 	pr_err("%s address %p with insufficient space\n",
305
226
 		type_check_kinds[data->type_check_kind],
306
227
 		(void *) ptr);
307
228
 	pr_err("for an object of type %s\n", data->type->type_name);
308
-	ubsan_epilogue(&flags);
229
+	ubsan_epilogue();
309
230
 }
310
231
 
311
232
 static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
312
233
 				unsigned long ptr)
313
234
 {
235
+	unsigned long flags = user_access_save();
314
236
 
315
237
 	if (!ptr)
316
238
 		handle_null_ptr_deref(data);
..
..
@@ -318,6 +240,8 @@
318
240
 		handle_misaligned_access(data, ptr);
319
241
 	else
320
242
 		handle_object_size_mismatch(data, ptr);
243
+
244
+	user_access_restore(flags);
321
245
 }
322
246
 
323
247
 void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
..
..
@@ -334,10 +258,9 @@
334
258
 }
335
259
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
336
260
 
337
-void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
338
-				void *ptr)
261
+void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
339
262
 {
340
-
263
+	struct type_mismatch_data_v1 *data = _data;
341
264
 	struct type_mismatch_data_common common_data = {
342
265
 		.location = &data->location,
343
266
 		.type = data->type,
..
..
@@ -349,54 +272,36 @@
349
272
 }
350
273
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
351
274
 
352
-void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
353
-					void *bound)
275
+void __ubsan_handle_out_of_bounds(void *_data, void *index)
354
276
 {
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;
277
+	struct out_of_bounds_data *data = _data;
373
278
 	char index_str[VALUE_LENGTH];
374
279
 
375
280
 	if (suppress_report(&data->location))
376
281
 		return;
377
282
 
378
-	ubsan_prologue(&data->location, &flags);
283
+	ubsan_prologue(&data->location, "array-index-out-of-bounds");
379
284
 
380
285
 	val_to_string(index_str, sizeof(index_str), data->index_type, index);
381
286
 	pr_err("index %s is out of range for type %s\n", index_str,
382
287
 		data->array_type->type_name);
383
-	ubsan_epilogue(&flags);
288
+	ubsan_epilogue();
384
289
 }
385
290
 EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
386
291
 
387
-void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
388
-					void *lhs, void *rhs)
292
+void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
389
293
 {
390
-	unsigned long flags;
294
+	struct shift_out_of_bounds_data *data = _data;
391
295
 	struct type_descriptor *rhs_type = data->rhs_type;
392
296
 	struct type_descriptor *lhs_type = data->lhs_type;
393
297
 	char rhs_str[VALUE_LENGTH];
394
298
 	char lhs_str[VALUE_LENGTH];
299
+	unsigned long ua_flags = user_access_save();
395
300
 
396
301
 	if (suppress_report(&data->location))
397
-		return;
302
+		goto out;
398
303
 
399
-	ubsan_prologue(&data->location, &flags);
304
+	ubsan_prologue(&data->location, "shift-out-of-bounds");
400
305
 
401
306
 	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
402
307
 	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
..
..
@@ -419,38 +324,69 @@
419
324
 			lhs_str, rhs_str,
420
325
 			lhs_type->type_name);
421
326
 
422
-	ubsan_epilogue(&flags);
327
+	ubsan_epilogue();
328
+out:
329
+	user_access_restore(ua_flags);
423
330
 }
424
331
 EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
425
332
 
426
333
 
427
-void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
334
+void __ubsan_handle_builtin_unreachable(void *_data)
428
335
 {
429
-	unsigned long flags;
430
-
431
-	ubsan_prologue(&data->location, &flags);
336
+	struct unreachable_data *data = _data;
337
+	ubsan_prologue(&data->location, "unreachable");
432
338
 	pr_err("calling __builtin_unreachable()\n");
433
-	ubsan_epilogue(&flags);
339
+	ubsan_epilogue();
434
340
 	panic("can't return from __builtin_unreachable()");
435
341
 }
436
342
 EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
437
343
 
438
-void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
439
-				void *val)
344
+void __ubsan_handle_load_invalid_value(void *_data, void *val)
440
345
 {
441
-	unsigned long flags;
346
+	struct invalid_value_data *data = _data;
442
347
 	char val_str[VALUE_LENGTH];
443
348
 
444
349
 	if (suppress_report(&data->location))
445
350
 		return;
446
351
 
447
-	ubsan_prologue(&data->location, &flags);
352
+	ubsan_prologue(&data->location, "invalid-load");
448
353
 
449
354
 	val_to_string(val_str, sizeof(val_str), data->type, val);
450
355
 
451
356
 	pr_err("load of value %s is not a valid value for type %s\n",
452
357
 		val_str, data->type->type_name);
453
358
 
454
-	ubsan_epilogue(&flags);
359
+	ubsan_epilogue();
455
360
 }
456
361
 EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
362
+
363
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
364
+					 unsigned long align,
365
+					 unsigned long offset);
366
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
367
+					 unsigned long align,
368
+					 unsigned long offset)
369
+{
370
+	struct alignment_assumption_data *data = _data;
371
+	unsigned long real_ptr;
372
+
373
+	if (suppress_report(&data->location))
374
+		return;
375
+
376
+	ubsan_prologue(&data->location, "alignment-assumption");
377
+
378
+	if (offset)
379
+		pr_err("assumption of %lu byte alignment (with offset of %lu byte) for pointer of type %s failed",
380
+		       align, offset, data->type->type_name);
381
+	else
382
+		pr_err("assumption of %lu byte alignment for pointer of type %s failed",
383
+		       align, data->type->type_name);
384
+
385
+	real_ptr = ptr - offset;
386
+	pr_err("%saddress is %lu aligned, misalignment offset is %lu bytes",
387
+	       offset ? "offset " : "", BIT(real_ptr ? __ffs(real_ptr) : 0),
388
+	       real_ptr & (align - 1));
389
+
390
+	ubsan_epilogue();
391
+}
392
+EXPORT_SYMBOL(__ubsan_handle_alignment_assumption);