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
40 lines
537 B
Bash
Executable File
40 lines
537 B
Bash
Executable File
#!/bin/sh
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set -e
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# Setup
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f=/sys/kernel/debug/lkmc_fops
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mod="${1:-fops.ko}"
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shift
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insmod "$mod" "$@"
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# read
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[ "$(cat "$f")" = abcd ]
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# write
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printf 01 > "$f"
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[ "$(cat "$f")" = 01cd ]
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# ENOSPC
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printf abcd > "$f"
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set +e
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printf 12345 > "$f"
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exit_status="$?"
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set -e
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[ "$exit_status" -eq 1 ]
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[ "$(cat "$f")" = abcd ]
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# seek
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printf 1234 > "$f"
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printf z | dd bs=1 of="$f" seek=2
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[ "$(cat "$f")" = 12z4 ]
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# seek past the end
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printf 1234 > "$f"
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printf xy | dd bs=1 of="$f" seek=6
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[ "$(cat "$f")" = 1234 ]
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# Teardown
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rmmod fops
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echo passed
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