diff --git a/include/linux/module.h b/include/linux/module.h
index c9f1200b2312..b58f2de48957 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -590,7 +590,8 @@ struct module *find_module(const char *name);
 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
    symnum out of range. */
 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
-			char *name, char *module_name, int *exported);
+		       char *name, char *module_name, unsigned long *size,
+		       int *exported);
 
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
@@ -768,8 +769,8 @@ static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *
 }
 
 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
-					char *type, char *name,
-					char *module_name, int *exported)
+				     char *type, char *name, char *module_name,
+				     unsigned long *size, int *exported)
 {
 	return -ERANGE;
 }
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 38109bb02bef..c87a593b40ea 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -36,6 +36,7 @@
  */
 extern const unsigned long kallsyms_addresses[] __weak;
 extern const int kallsyms_offsets[] __weak;
+extern const unsigned long kallsyms_sizes[] __weak;
 extern const u8 kallsyms_names[] __weak;
 
 /*
@@ -257,12 +258,24 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 }
 #endif /* CONFIG_LIVEPATCH */
 
+/*
+ * The caller passes in an address, and we return an index to the symbol --
+ * potentially also size and offset information.
+ * But an address might map to multiple symbols because:
+ *   - some symbols might have zero size
+ *   - some symbols might be aliases of one another
+ *   - some symbols might span (encompass) others
+ * The symbols should already be ordered so that, for a particular address,
+ * we first have the zero-size ones, then the biggest, then the smallest.
+ * So we find the index by:
+ *   - finding the last symbol with the target address
+ *   - backing the index up so long as both the address and size are unchanged
+ */
 static unsigned long get_symbol_pos(unsigned long addr,
 				    unsigned long *symbolsize,
 				    unsigned long *offset)
 {
-	unsigned long symbol_start = 0, symbol_end = 0;
-	unsigned long i, low, high, mid;
+	unsigned long low, high, mid;
 
 	/* This kernel should never had been booted. */
 	if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
@@ -283,36 +296,17 @@ static unsigned long get_symbol_pos(unsigned long addr,
 	}
 
 	/*
-	 * Search for the first aliased symbol. Aliased
-	 * symbols are symbols with the same address.
+	 * Search for the first aliased symbol.
 	 */
-	while (low && kallsyms_sym_address(low-1) == kallsyms_sym_address(low))
+	while (low
+	    && kallsyms_sym_address(low-1) == kallsyms_sym_address(low)
+	    && kallsyms_sizes[low-1] == kallsyms_sizes[low])
 		--low;
 
-	symbol_start = kallsyms_sym_address(low);
-
-	/* Search for next non-aliased symbol. */
-	for (i = low + 1; i < kallsyms_num_syms; i++) {
-		if (kallsyms_sym_address(i) > symbol_start) {
-			symbol_end = kallsyms_sym_address(i);
-			break;
-		}
-	}
-
-	/* If we found no next symbol, we use the end of the section. */
-	if (!symbol_end) {
-		if (is_kernel_inittext(addr))
-			symbol_end = (unsigned long)_einittext;
-		else if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
-			symbol_end = (unsigned long)_end;
-		else
-			symbol_end = (unsigned long)_etext;
-	}
-
 	if (symbolsize)
-		*symbolsize = symbol_end - symbol_start;
+		*symbolsize = kallsyms_sizes[low];
 	if (offset)
-		*offset = addr - symbol_start;
+		*offset = addr - kallsyms_sym_address(low);
 
 	return low;
 }
@@ -633,6 +627,7 @@ struct kallsym_iter {
 	loff_t pos_bpf_end;
 	unsigned long value;
 	unsigned int nameoff; /* If iterating in core kernel symbols. */
+	unsigned long size;
 	char type;
 	char name[KSYM_NAME_LEN];
 	char module_name[MODULE_NAME_LEN];
@@ -667,7 +662,7 @@ static int get_ksymbol_mod(struct kallsym_iter *iter)
 	int ret = module_get_kallsym(iter->pos - iter->pos_arch_end,
 				     &iter->value, &iter->type,
 				     iter->name, iter->module_name,
-				     &iter->exported);
+				     &iter->size, &iter->exported);
 	iter->builtin_module_names = NULL;
 
 	if (ret < 0) {
@@ -740,6 +735,7 @@ static unsigned long get_ksymbol_core(struct kallsym_iter *iter, int kallmodsyms
 	iter->exported = 0;
 	iter->value = kallsyms_sym_address(iter->pos);
 
+	iter->size = kallsyms_sizes[iter->pos];
 	iter->type = kallsyms_get_symbol_type(off);
 
 	iter->module_name[0] = '\0';
@@ -858,12 +854,14 @@ static int s_show_internal(struct seq_file *m, void *p, int kallmodsyms)
 {
 	void *value;
 	struct kallsym_iter *iter = m->private;
+	unsigned long size;
 
 	/* Some debugging symbols have no name.  Ignore them. */
 	if (!iter->name[0])
 		return 0;
 
 	value = iter->show_value ? (void *)iter->value : NULL;
+	size = iter->show_value ? iter->size : 0;
 
 	/*
 	 * Real module, or built-in module and /proc/kallsyms being shown.
@@ -883,15 +881,15 @@ static int s_show_internal(struct seq_file *m, void *p, int kallmodsyms)
 			 * /proc/kallmodsyms, built as a module.
 			 */
 			if (iter->builtin_module_names == NULL)
-				seq_printf(m, "%px %c %s\t[%s]\n", value,
-					   type, iter->name,
+				seq_printf(m, "%px %lx %c %s\t[%s]\n", value,
+					   size, type, iter->name,
 					   iter->module_name);
 			/*
 			 * /proc/kallmodsyms, single-module symbol.
 			 */
 			else if (*iter->builtin_module_names != '\0')
-				seq_printf(m, "%px %c %s\t[%s]\n", value,
-					   type, iter->name,
+				seq_printf(m, "%px %lx %c %s\t[%s]\n", value,
+					   size, type, iter->name,
 					   iter->builtin_module_names);
 			/*
 			 * /proc/kallmodsyms, multimodule symbol.  Formatted
@@ -902,8 +900,8 @@ static int s_show_internal(struct seq_file *m, void *p, int kallmodsyms)
 				size_t i = *(char *)(iter->builtin_module_names + 1);
 				const char *walk = iter->builtin_module_names + 2;
 
-				seq_printf(m, "%px %c %s\t[%s]", value,
-					   type, iter->name, walk);
+				seq_printf(m, "%px %lx %c %s\t[%s]", value,
+					   size, type, iter->name, walk);
 
                                 while (--i > 0) {
 					walk += strlen(walk) + 1;
@@ -915,7 +913,13 @@ static int s_show_internal(struct seq_file *m, void *p, int kallmodsyms)
 #endif /* CONFIG_KALLMODSYMS */
 			seq_printf(m, "%px %c %s\t[%s]\n", value,
 				   type, iter->name, iter->module_name);
-	} else
+	/*
+	 * Non-modular, /proc/kallmodsyms -> print size.
+	 */
+	} else if (kallmodsyms)
+		seq_printf(m, "%px %lx %c %s\n", value, size,
+			   iter->type, iter->name);
+	else
 		seq_printf(m, "%px %c %s\n", value,
 			   iter->type, iter->name);
 	return 0;
diff --git a/kernel/module.c b/kernel/module.c
index 40ec9a030eec..3653a7de9b41 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4368,7 +4368,8 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
 }
 
 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
-			char *name, char *module_name, int *exported)
+		       char *name, char *module_name, unsigned long *size,
+		       int *exported)
 {
 	struct module *mod;
 
@@ -4387,6 +4388,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 			strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN);
 			strlcpy(module_name, mod->name, MODULE_NAME_LEN);
 			*exported = is_exported(name, *value, mod);
+			*size = kallsyms->symtab[symnum].st_size;
 			preempt_enable();
 			return 0;
 		}
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 93fdf0dcf587..fcb1d706809c 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -5,7 +5,7 @@
  * This software may be used and distributed according to the terms
  * of the GNU General Public License, incorporated herein by reference.
  *
- * Usage: nm -n vmlinux
+ * Usage: nm -n -S vmlinux
  *        | scripts/kallsyms [--all-symbols] [--absolute-percpu]
  *             [--base-relative] [--builtin=modules_thick.builtin]
  *        > symbols.S
@@ -38,6 +38,7 @@
 
 struct sym_entry {
 	unsigned long long addr;
+	unsigned long long size;
 	unsigned int len;
 	unsigned int start_pos;
 	unsigned int percpu_absolute;
@@ -394,6 +395,7 @@ static bool is_ignored_symbol(const char *name, char type)
 		"kallsyms_addresses",
 		"kallsyms_offsets",
 		"kallsyms_relative_base",
+		"kallsyms_sizes",
 		"kallsyms_num_syms",
 		"kallsyms_num_modules",
 		"kallsyms_names",
@@ -507,10 +509,11 @@ static struct sym_entry *read_symbol(FILE *in)
 	unsigned long long addr;
 	unsigned int len;
 	struct sym_entry *sym;
-	int rc;
+	int rc = 0;
+	unsigned long long size;
 
-	rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
-	if (rc != 3) {
+	rc = fscanf(in, "%llx %llx %c %499s\n", &addr, &size, &type, name);
+	if (rc != 4) {
 		if (rc != EOF && fgets(name, 500, in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
@@ -548,6 +551,7 @@ static struct sym_entry *read_symbol(FILE *in)
 	sym->sym[0] = type;
 	strcpy(sym_name(sym), name);
 	sym->percpu_absolute = 0;
+	sym->size = size;
 
 	return sym;
 }
@@ -932,6 +936,11 @@ static void write_src(void)
 		printf("\n");
 	}
 
+	output_label("kallsyms_sizes");
+	for (i = 0; i < table_cnt; i++)
+		printf("\tPTR\t%#llx\n", table[i]->size);
+	printf("\n");
+
 #ifdef CONFIG_KALLMODSYMS
 	output_kallmodsyms_modules();
 	output_kallmodsyms_objfiles();
@@ -1189,6 +1198,18 @@ static int compare_symbols(const void *a, const void *b)
 	if (sa->addr < sb->addr)
 		return -1;
 
+	/* zero-size markers before nonzero-size symbols */
+	if (sa->size > 0 && sb->size == 0)
+		return 1;
+	if (sa->size == 0 && sb->size > 0)
+		return -1;
+
+	/* sort by size (large size preceding symbols it encompasses) */
+	if (sa->size < sb->size)
+		return 1;
+	if (sa->size > sb->size)
+		return -1;
+
 	/* sort by "weakness" type */
 	wa = (sa->sym[0] == 'w') || (sa->sym[0] == 'W');
 	wb = (sb->sym[0] == 'w') || (sb->sym[0] == 'W');
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index a30075c14a25..c780f2a5d10c 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -274,7 +274,12 @@ kallsyms()
 	fi
 
 	info KSYMS ${2}
-	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2}
+	# "nm -S" does not print symbol size when size is 0
+	# Therefore use awk to regularize the data:
+	#   - when there are only three fields, add an explicit "0"
+	#   - when there are already four fields, pass through as is
+	${NM} -n -S ${1} | ${AWK} 'NF==3 {print $1, 0, $2, $3}; NF==4' | \
+	    scripts/kallsyms ${kallsymopt} > ${2}
 }
 
 # Perform one step in kallsyms generation, including temporary linking of
