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05d9a95283
The ultravisor will do an integrity check of the kernel image but we
relocated it so the check will fail. Restore the original image by
relocating it back to the kernel virtual base address.
This works because during build vmlinux is linked with an expected
virtual runtime address of KERNELBASE.
Fixes: 6a9c930bd7 ("powerpc/prom_init: Add the ESM call to prom_init")
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Tested-by: Michael Anderson <andmike@linux.ibm.com>
[mpe: Add IS_ENABLED() to fix the CONFIG_RELOCATABLE=n build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190911163433.12822-1-bauerman@linux.ibm.com
91 lines
2 KiB
Bash
91 lines
2 KiB
Bash
#!/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 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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# an error. The point of this is to discourage people from
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# intentionally or accidentally adding new code to prom_init.c
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# which has side effects on other parts of the kernel.
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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$" .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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WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
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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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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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relocate"
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NM="$1"
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OBJ="$2"
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ERROR=0
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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 $2}')
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do
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# On 64-bit nm gives us the function descriptors, which have
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# a leading . on the name, so strip it off here.
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UNDEF="${UNDEF#.}"
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if [ $KBUILD_VERBOSE ]; then
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if [ $KBUILD_VERBOSE -ne 0 ]; then
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echo "Checking prom_init.o symbol '$UNDEF'"
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fi
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fi
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OK=0
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for WHITE in $WHITELIST
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do
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if [ "$UNDEF" = "$WHITE" ]; then
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OK=1
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break
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fi
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done
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# ignore register save/restore funcitons
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case $UNDEF in
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_restgpr_*|_restgpr0_*|_rest32gpr_*)
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OK=1
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;;
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_savegpr_*|_savegpr0_*|_save32gpr_*)
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OK=1
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;;
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esac
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if [ $OK -eq 0 ]; then
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ERROR=1
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echo "Error: External symbol '$UNDEF' referenced" \
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"from prom_init.c" >&2
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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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exit $ERROR
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