change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/lib/ubsan.c
..
..
@@ -1,13 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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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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  */
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8
 
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 #include <linux/bitops.h>
..
..
@@ -17,6 +13,7 @@
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 #include <linux/kernel.h>
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 #include <linux/types.h>
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 #include <linux/sched.h>
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+#include <linux/uaccess.h>
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17
 
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 #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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 {
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 	return test_and_set_bit(REPORTED_BIT, &location->reported);
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-}
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-
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-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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 }
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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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 	if (type_is_int(type)) {
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 		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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 			scnprintf(str, size, "0x%08x%08x%08x%08x",
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..
@@ -143,108 +133,36 @@
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 	}
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 }
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-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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 {
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 	current->in_ubsan++;
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-	spin_lock_irqsave(&report_lock, *flags);
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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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 }
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-static void ubsan_epilogue(unsigned long *flags)
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+static void ubsan_epilogue(void)
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 {
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 	dump_stack();
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 	pr_err("========================================"
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 		"========================================\n");
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-	spin_unlock_irqrestore(&report_lock, *flags);
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+
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 	current->in_ubsan--;
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+
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+	check_panic_on_warn("UBSAN");
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 }
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-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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 {
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-
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-	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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 	char rhs_val_str[VALUE_LENGTH];
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161
 
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 	if (suppress_report(&data->location))
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 		return;
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164
 
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-	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");
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-	pr_err("%s %c %s cannot be represented in type %s\n",
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-		lhs_val_str,
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-		op,
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-		rhs_val_str,
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-		type->type_name);
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-
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-	ubsan_epilogue(&flags);
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-}
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-
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-void __ubsan_handle_add_overflow(struct overflow_data *data,
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-				void *lhs, void *rhs)
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-{
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-
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-	handle_overflow(data, lhs, rhs, '+');
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-}
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-EXPORT_SYMBOL(__ubsan_handle_add_overflow);
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-
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-void __ubsan_handle_sub_overflow(struct overflow_data *data,
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-				void *lhs, void *rhs)
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-{
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-	handle_overflow(data, lhs, rhs, '-');
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-}
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-EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
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-
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-void __ubsan_handle_mul_overflow(struct overflow_data *data,
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-				void *lhs, void *rhs)
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-{
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-	handle_overflow(data, lhs, rhs, '*');
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-}
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-EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
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-
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-void __ubsan_handle_negate_overflow(struct overflow_data *data,
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-				void *old_val)
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-{
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-	unsigned long flags;
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-	char old_val_str[VALUE_LENGTH];
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-
223
-	if (suppress_report(&data->location))
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-		return;
225
-
226
-	ubsan_prologue(&data->location, &flags);
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-
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-	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
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-
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-	pr_err("negation of %s cannot be represented in type %s:\n",
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-		old_val_str, data->type->type_name);
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-
233
-	ubsan_epilogue(&flags);
234
-}
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-EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
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-
237
-
238
-void __ubsan_handle_divrem_overflow(struct overflow_data *data,
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-				void *lhs, void *rhs)
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-{
241
-	unsigned long flags;
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-	char rhs_val_str[VALUE_LENGTH];
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-
244
-	if (suppress_report(&data->location))
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-		return;
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-
247
-	ubsan_prologue(&data->location, &flags);
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+	ubsan_prologue(&data->location, "division-overflow");
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166
 
249
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 	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 @@
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172
 	else
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173
 		pr_err("division by zero\n");
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174
 
257
-	ubsan_epilogue(&flags);
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+	ubsan_epilogue();
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176
 }
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 EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
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178
 
261
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 static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
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180
 {
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-	unsigned long flags;
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-
265
181
 	if (suppress_report(data->location))
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182
 		return;
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183
 
268
-	ubsan_prologue(data->location, &flags);
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+	ubsan_prologue(data->location, "null-ptr-deref");
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 	pr_err("%s null pointer of type %s\n",
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187
 		type_check_kinds[data->type_check_kind],
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 		data->type->type_name);
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189
 
274
-	ubsan_epilogue(&flags);
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+	ubsan_epilogue();
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191
 }
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192
 
277
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 static void handle_misaligned_access(struct type_mismatch_data_common *data,
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194
 				unsigned long ptr)
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 {
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-	unsigned long flags;
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-
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196
 	if (suppress_report(data->location))
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197
 		return;
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198
 
285
-	ubsan_prologue(data->location, &flags);
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+	ubsan_prologue(data->location, "misaligned-access");
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200
 
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 	pr_err("%s misaligned address %p for type %s\n",
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 		type_check_kinds[data->type_check_kind],
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 		(void *)ptr, data->type->type_name);
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 	pr_err("which requires %ld byte alignment\n", data->alignment);
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292
-	ubsan_epilogue(&flags);
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+	ubsan_epilogue();
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 }
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 static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
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 					unsigned long ptr)
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211
 {
298
-	unsigned long flags;
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-
300
212
 	if (suppress_report(data->location))
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 		return;
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214
 
303
-	ubsan_prologue(data->location, &flags);
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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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 	pr_err("for an object of type %s\n", data->type->type_name);
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-	ubsan_epilogue(&flags);
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+	ubsan_epilogue();
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221
 }
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222
 
311
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 static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
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224
 				unsigned long ptr)
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 {
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+	unsigned long flags = user_access_save();
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227
 
315
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 	if (!ptr)
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 		handle_null_ptr_deref(data);
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@@ -318,6 +231,8 @@
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 		handle_misaligned_access(data, ptr);
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 	else
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 		handle_object_size_mismatch(data, ptr);
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+
235
+	user_access_restore(flags);
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 }
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 void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
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@@ -334,10 +249,9 @@
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 }
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 EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
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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)
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 {
340
-
254
+	struct type_mismatch_data_v1 *data = _data;
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 	struct type_mismatch_data_common common_data = {
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 		.location = &data->location,
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 		.type = data->type,
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@@ -349,54 +263,36 @@
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 }
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 EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
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-void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
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-					void *bound)
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+void __ubsan_handle_out_of_bounds(void *_data, void *index)
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267
 {
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-	unsigned long flags;
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-	char bound_str[VALUE_LENGTH];
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-
358
-	if (suppress_report(&data->location))
359
-		return;
360
-
361
-	ubsan_prologue(&data->location, &flags);
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-
363
-	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
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-	pr_err("variable length array bound value %s <= 0\n", bound_str);
365
-
366
-	ubsan_epilogue(&flags);
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-}
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-EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
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-
370
-void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
371
-{
372
-	unsigned long flags;
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+	struct out_of_bounds_data *data = _data;
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 	char index_str[VALUE_LENGTH];
374
270
 
375
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 	if (suppress_report(&data->location))
376
272
 		return;
377
273
 
378
-	ubsan_prologue(&data->location, &flags);
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+	ubsan_prologue(&data->location, "array-index-out-of-bounds");
379
275
 
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 	val_to_string(index_str, sizeof(index_str), data->index_type, index);
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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
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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);