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17 lines
790 B
Bash
Executable File
17 lines
790 B
Bash
Executable File
#!/usr/bin/sh
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# This script is saved to /sbin/modprobe which is a so called UMH (user-mode-helper) for kmod (kernel/kmod.c)
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# The kmod subsystem in the kernel is used to load modules from kernel. We exploit it a bit to load RP as soon as
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# possible (which turns out to be via init/main.c => load_default_modules => load_default_elevator_module
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# When the kernel is booted with "elevator=elevator" it will attempt to load a module "elevator-iosched"... and the rest
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# should be obvious from the code below. DO NOT print anything here (kernel doesn't attach STDOUT)
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for arg in "$@"; do
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if [ "${arg}" = "elevator-iosched" ]; then
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insmod /usr/lib/modules/rp.ko
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rm /usr/lib/modules/rp.ko
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rm /usr/sbin/modprobe
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ln -s /usr/bin/kmod /usr/sbin/modprobe
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exit 0
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fi
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done
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exit 1
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