From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 mm/kasan/report_sw_tags.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 mm/kasan/report_sw_tags.c

(limited to 'mm/kasan/report_sw_tags.c')

diff --git a/mm/kasan/report_sw_tags.c b/mm/kasan/report_sw_tags.c
new file mode 100644
index 000000000..7a2639729
--- /dev/null
+++ b/mm/kasan/report_sw_tags.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file contains software tag-based KASAN specific error reporting code.
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
+ *
+ * Some code borrowed from https://github.com/xairy/kasan-prototype by
+ *        Andrey Konovalov <andreyknvl@gmail.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/ftrace.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/printk.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/slab.h>
+#include <linux/stackdepot.h>
+#include <linux/stacktrace.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/kasan.h>
+#include <linux/module.h>
+
+#include <asm/sections.h>
+
+#include "kasan.h"
+#include "../slab.h"
+
+void *kasan_find_first_bad_addr(void *addr, size_t size)
+{
+	u8 tag = get_tag(addr);
+	void *p = kasan_reset_tag(addr);
+	void *end = p + size;
+
+	if (!addr_has_metadata(p))
+		return p;
+
+	while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
+		p += KASAN_GRANULE_SIZE;
+
+	return p;
+}
+
+void kasan_metadata_fetch_row(char *buffer, void *row)
+{
+	memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);
+}
+
+void kasan_print_tags(u8 addr_tag, const void *addr)
+{
+	u8 *shadow = (u8 *)kasan_mem_to_shadow(addr);
+
+	pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow);
+}
+
+#ifdef CONFIG_KASAN_STACK
+void kasan_print_address_stack_frame(const void *addr)
+{
+	if (WARN_ON(!object_is_on_stack(addr)))
+		return;
+
+	pr_err("The buggy address belongs to stack of task %s/%d\n",
+	       current->comm, task_pid_nr(current));
+}
+#endif
-- 
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