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
 /*
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  * UBSAN error reporting functions
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  *
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5
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
5
6
  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
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- *
7
- * 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.
10
- *
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7
  */
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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"
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19
 
..
..
@@ -46,13 +43,6 @@
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 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)
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-{
54
-	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
 
58
48
 static bool suppress_report(struct source_location *loc)
..
..
@@ -122,7 +112,7 @@
122
112
 {
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113
 	if (type_is_int(type)) {
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114
 		if (type_bit_width(type) == 128) {
125
-#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
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+#if defined(CONFIG_ARCH_SUPPORTS_INT128)
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116
 			u_max val = get_unsigned_val(type, value);
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117
 
128
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 			scnprintf(str, size, "0x%08x%08x%08x%08x",
..
..
@@ -143,13 +133,14 @@
143
133
 	}
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134
 }
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135
 
146
-static void ubsan_prologue(struct source_location *location)
136
+static void ubsan_prologue(struct source_location *loc, const char *reason)
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137
 {
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138
 	current->in_ubsan++;
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139
 
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 	pr_err("========================================"
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141
 		"========================================\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,
143
+		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
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144
 }
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145
 
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146
 static void ubsan_epilogue(void)
..
..
@@ -159,85 +150,28 @@
159
150
 		"========================================\n");
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151
 
161
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 	current->in_ubsan--;
153
+
154
+	if (panic_on_warn) {
155
+		/*
156
+		 * This thread may hit another WARN() in the panic path.
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+		 * Resetting this prevents additional WARN() from panicking the
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+		 * 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");
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+	}
162
164
 }
163
165
 
164
-static void handle_overflow(struct overflow_data *data, void *lhs,
165
-			void *rhs, char op)
166
+void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
166
167
 {
167
-
168
-	struct type_descriptor *type = data->type;
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-	char lhs_val_str[VALUE_LENGTH];
168
+	struct overflow_data *data = _data;
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169
 	char rhs_val_str[VALUE_LENGTH];
171
170
 
172
171
 	if (suppress_report(&data->location))
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172
 		return;
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173
 
175
-	ubsan_prologue(&data->location);
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-
177
-	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",
180
-		type_is_signed(type) ? "signed" : "unsigned");
181
-	pr_err("%s %c %s cannot be represented in type %s\n",
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-		lhs_val_str,
183
-		op,
184
-		rhs_val_str,
185
-		type->type_name);
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-
187
-	ubsan_epilogue();
188
-}
189
-
190
-void __ubsan_handle_add_overflow(struct overflow_data *data,
191
-				void *lhs, void *rhs)
192
-{
193
-
194
-	handle_overflow(data, lhs, rhs, '+');
195
-}
196
-EXPORT_SYMBOL(__ubsan_handle_add_overflow);
197
-
198
-void __ubsan_handle_sub_overflow(struct overflow_data *data,
199
-				void *lhs, void *rhs)
200
-{
201
-	handle_overflow(data, lhs, rhs, '-');
202
-}
203
-EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
204
-
205
-void __ubsan_handle_mul_overflow(struct overflow_data *data,
206
-				void *lhs, void *rhs)
207
-{
208
-	handle_overflow(data, lhs, rhs, '*');
209
-}
210
-EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
211
-
212
-void __ubsan_handle_negate_overflow(struct overflow_data *data,
213
-				void *old_val)
214
-{
215
-	char old_val_str[VALUE_LENGTH];
216
-
217
-	if (suppress_report(&data->location))
218
-		return;
219
-
220
-	ubsan_prologue(&data->location);
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-
222
-	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
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-
224
-	pr_err("negation of %s cannot be represented in type %s:\n",
225
-		old_val_str, data->type->type_name);
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-
227
-	ubsan_epilogue();
228
-}
229
-EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
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-
231
-
232
-void __ubsan_handle_divrem_overflow(struct overflow_data *data,
233
-				void *lhs, void *rhs)
234
-{
235
-	char rhs_val_str[VALUE_LENGTH];
236
-
237
-	if (suppress_report(&data->location))
238
-		return;
239
-
240
-	ubsan_prologue(&data->location);
174
+	ubsan_prologue(&data->location, "division-overflow");
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175
 
242
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 	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
243
177
 
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@@ -256,7 +190,7 @@
256
190
 	if (suppress_report(data->location))
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191
 		return;
258
192
 
259
-	ubsan_prologue(data->location);
193
+	ubsan_prologue(data->location, "null-ptr-deref");
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194
 
261
195
 	pr_err("%s null pointer of type %s\n",
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196
 		type_check_kinds[data->type_check_kind],
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..
@@ -271,7 +205,7 @@
271
205
 	if (suppress_report(data->location))
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206
 		return;
273
207
 
274
-	ubsan_prologue(data->location);
208
+	ubsan_prologue(data->location, "misaligned-access");
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209
 
276
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 	pr_err("%s misaligned address %p for type %s\n",
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211
 		type_check_kinds[data->type_check_kind],
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@@ -287,7 +221,7 @@
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 	if (suppress_report(data->location))
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222
 		return;
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223
 
290
-	ubsan_prologue(data->location);
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+	ubsan_prologue(data->location, "object-size-mismatch");
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 	pr_err("%s address %p with insufficient space\n",
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 		type_check_kinds[data->type_check_kind],
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 		(void *) ptr);
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..
@@ -298,6 +232,7 @@
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 static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
299
233
 				unsigned long ptr)
300
234
 {
235
+	unsigned long flags = user_access_save();
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236
 
302
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 	if (!ptr)
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238
 		handle_null_ptr_deref(data);
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..
@@ -305,6 +240,8 @@
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 		handle_misaligned_access(data, ptr);
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241
 	else
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242
 		handle_object_size_mismatch(data, ptr);
243
+
244
+	user_access_restore(flags);
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245
 }
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246
 
310
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 void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
..
..
@@ -321,10 +258,9 @@
321
258
 }
322
259
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
323
260
 
324
-void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
325
-				void *ptr)
261
+void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
326
262
 {
327
-
263
+	struct type_mismatch_data_v1 *data = _data;
328
264
 	struct type_mismatch_data_common common_data = {
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265
 		.location = &data->location,
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266
 		.type = data->type,
..
..
@@ -336,31 +272,15 @@
336
272
 }
337
273
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
338
274
 
339
-void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
340
-					void *bound)
275
+void __ubsan_handle_out_of_bounds(void *_data, void *index)
341
276
 {
342
-	char bound_str[VALUE_LENGTH];
343
-
344
-	if (suppress_report(&data->location))
345
-		return;
346
-
347
-	ubsan_prologue(&data->location);
348
-
349
-	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
350
-	pr_err("variable length array bound value %s <= 0\n", bound_str);
351
-
352
-	ubsan_epilogue();
353
-}
354
-EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
355
-
356
-void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
357
-{
277
+	struct out_of_bounds_data *data = _data;
358
278
 	char index_str[VALUE_LENGTH];
359
279
 
360
280
 	if (suppress_report(&data->location))
361
281
 		return;
362
282
 
363
-	ubsan_prologue(&data->location);
283
+	ubsan_prologue(&data->location, "array-index-out-of-bounds");
364
284
 
365
285
 	val_to_string(index_str, sizeof(index_str), data->index_type, index);
366
286
 	pr_err("index %s is out of range for type %s\n", index_str,
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..
@@ -369,18 +289,19 @@
369
289
 }
370
290
 EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
371
291
 
372
-void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
373
-					void *lhs, void *rhs)
292
+void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
374
293
 {
294
+	struct shift_out_of_bounds_data *data = _data;
375
295
 	struct type_descriptor *rhs_type = data->rhs_type;
376
296
 	struct type_descriptor *lhs_type = data->lhs_type;
377
297
 	char rhs_str[VALUE_LENGTH];
378
298
 	char lhs_str[VALUE_LENGTH];
299
+	unsigned long ua_flags = user_access_save();
379
300
 
380
301
 	if (suppress_report(&data->location))
381
-		return;
302
+		goto out;
382
303
 
383
-	ubsan_prologue(&data->location);
304
+	ubsan_prologue(&data->location, "shift-out-of-bounds");
384
305
 
385
306
 	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
386
307
 	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
..
..
@@ -404,28 +325,31 @@
404
325
 			lhs_type->type_name);
405
326
 
406
327
 	ubsan_epilogue();
328
+out:
329
+	user_access_restore(ua_flags);
407
330
 }
408
331
 EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
409
332
 
410
333
 
411
-void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
334
+void __ubsan_handle_builtin_unreachable(void *_data)
412
335
 {
413
-	ubsan_prologue(&data->location);
336
+	struct unreachable_data *data = _data;
337
+	ubsan_prologue(&data->location, "unreachable");
414
338
 	pr_err("calling __builtin_unreachable()\n");
415
339
 	ubsan_epilogue();
416
340
 	panic("can't return from __builtin_unreachable()");
417
341
 }
418
342
 EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
419
343
 
420
-void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
421
-				void *val)
344
+void __ubsan_handle_load_invalid_value(void *_data, void *val)
422
345
 {
346
+	struct invalid_value_data *data = _data;
423
347
 	char val_str[VALUE_LENGTH];
424
348
 
425
349
 	if (suppress_report(&data->location))
426
350
 		return;
427
351
 
428
-	ubsan_prologue(&data->location);
352
+	ubsan_prologue(&data->location, "invalid-load");
429
353
 
430
354
 	val_to_string(val_str, sizeof(val_str), data->type, val);
431
355
 
..
..
@@ -435,3 +359,34 @@
435
359
 	ubsan_epilogue();
436
360
 }
437
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);