mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-22 17:55:57 +01:00
e4847e4b40
Also:
* fix fops.c on both kernels:
* 5.9: the out of space error code was 1 not 8
* 6.6: for whatever reason we can't read the user buffer as before on the
diagnostic print, it leads to segfault and oops
* create memfile.c which is like fops.c but of unlimited size
60 lines
1.3 KiB
Bash
Executable File
60 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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set -eux
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name=scull
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mod="${1:-$name.ko}"
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shift
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insmod "$mod" "$@"
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major="$(awk "\$2==\"$name\" {print \$1}" /proc/devices)"
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rm -f /dev/${name}[0-3]
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mknod /dev/${name}0 c $major 0
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mknod /dev/${name}1 c $major 1
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mknod /dev/${name}2 c $major 2
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mknod /dev/${name}3 c $major 3
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rm -f /dev/${name}pipe[0-3]
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mknod /dev/${name}pipe0 c $major 4
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mknod /dev/${name}pipe1 c $major 5
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mknod /dev/${name}pipe2 c $major 6
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mknod /dev/${name}pipe3 c $major 7
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rm -f /dev/${name}single
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mknod /dev/${name}single c $major 8
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rm -f /dev/${name}uid
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mknod /dev/${name}uid c $major 9
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rm -f /dev/${name}wuid
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mknod /dev/${name}wuid c $major 10
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rm -f /dev/${name}priv
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mknod /dev/${name}priv c $major 11
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## scull
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f="/dev/${name}0"
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[ -z "$(cat "$f")" ]
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# Append starts writing from the start of the 4k block, not like the usual semantic.
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printf asdf > "$f"
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printf qw >> "$f"
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[ qwdf = "$(cat "$f")" ]
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# Overwrite first clears everything, then writes to start of 4k block.
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printf asdf > /dev/${name}0
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printf qw > /dev/${name}0
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[ qw = "$(cat "$f")" ]
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# Read from the middle
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printf asdf > /dev/${name}0
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[ df = "$(dd if="$f" bs=1 count=2 skip=2 status=none)" ]
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# Write to the middle
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printf asdf > "$f"
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printf we | dd of="$f" bs=1 seek=1 conv=notrunc status=none
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[ awef = "$(cat "$f")" ]
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echo passed
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