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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/powerpc/kernel/prom_init_check.sh
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@@ -1,11 +1,8 @@
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 #!/bin/sh
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+# SPDX-License-Identifier: GPL-2.0-or-later
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 #
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 # Copyright © 2008 IBM Corporation
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 #
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-# This program is free software; you can redistribute it and/or
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-# modify it under the terms of the GNU General Public License
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-# as published by the Free Software Foundation; either version
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-# 2 of the License, or (at your option) any later version.
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 # This script checks prom_init.o to see what external symbols it
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 # is using, if it finds symbols not in the whitelist it returns
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@@ -16,17 +13,38 @@
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 # If you really need to reference something from prom_init.o add
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 # it to the list below:
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+grep "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} >/dev/null
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+if [ $? -eq 0 ]
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+then
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+	MEM_FUNCS="__memcpy __memset"
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+else
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+	MEM_FUNCS="memcpy memset"
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+fi
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+
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 WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
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-_end enter_prom memcpy memset reloc_offset __secondary_hold
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+_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold
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 __secondary_hold_acknowledge __secondary_hold_spinloop __start
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-strcmp strcpy strlcpy strlen strncmp strstr kstrtobool logo_linux_clut224
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+logo_linux_clut224 btext_prepare_BAT
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 reloc_got2 kernstart_addr memstart_addr linux_banner _stext
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-__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC."
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+__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC.
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+relocate"
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 NM="$1"
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 OBJ="$2"
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 ERROR=0
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+
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+check_section()
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+{
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+    file=$1
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+    section=$2
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+    size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}")
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+    size=${size:-0}
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+    if [ $size -ne 0 ]; then
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+	ERROR=1
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+	echo "Error: Section $section not empty in prom_init.c" >&2
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+    fi
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+}
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 for UNDEF in $($NM -u $OBJ | awk '{print $2}')
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 do
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@@ -66,4 +84,8 @@
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 	fi
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 done
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+check_section $OBJ .data
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+check_section $OBJ .bss
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+check_section $OBJ .init.data
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+
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 exit $ERROR