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Relocating kernel at runtime is done very early in the boot process, so it is not convenient to check for relocations there and react in case a relocation was not expected. Powerpc architecture has a script that allows to check at compile time for such unexpected relocations: extract the common logic to scripts/ so that other architectures can take advantage of it. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Anup Patel <anup@brainfault.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Link: https://lore.kernel.org/r/20230329045329.64565-5-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
20 lines
717 B
Bash
Executable file
20 lines
717 B
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Get a list of all the relocations, remove from it the relocations
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# that are known to be legitimate and return this list to arch specific
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# script that will look for suspicious relocations.
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objdump="$1"
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nm="$2"
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vmlinux="$3"
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# Remove from the possible bad relocations those that match an undefined
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# weak symbol which will result in an absolute relocation to 0.
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# Weak unresolved symbols are of that form in nm output:
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# " w _binary__btf_vmlinux_bin_end"
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undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }')
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$objdump -R "$vmlinux" |
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grep -E '\<R_' |
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([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat)
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