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24 lines
755 B
Bash
24 lines
755 B
Bash
#!/usr/bin/sh
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# Create a new file to be patched
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binary=/usr/lib/systemd/systemd-volatile-root
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target=/usr/lib/systemd/systemd-volatile-root.reliant-profiling
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cp $binary $target
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# We must NOP calls to umount and rmdir
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hex_offsets=$(objdump -d "$binary" | grep -E 'call.*(umount|rmdir)' | awk '{ print $1 }' | tr -d ':')
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for hex_offset in $hex_offsets; do
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dec_offset=$(perl -le "print hex(\"$hex_offset\")")
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printf '\x90\x90\x90\x90\x90' | dd of="$target" bs=1 seek=$dec_offset conv=notrunc
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done
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# Verify the patch has succeeded
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for hex_offset in $hex_offsets; do
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echo -n "$hex_offset: "
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opcode=$(objdump -d "$target" | grep $hex_offset | awk '{ print $2 }')
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if [ "$opcode" -eq 90 ]; then
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echo "OK"
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else
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echo "FAIL"
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fi
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done
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