mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-25 19:21:35 +01:00
146e568db8
Motivation: userland is getting several new subdirectories, it would be too insane to just dump all of that in the guest root filesystem. To alleviate the cd pain, .profile puts user inside /lkmc by default.
31 lines
394 B
Bash
Executable File
31 lines
394 B
Bash
Executable File
#!/bin/sh
|
|
set -e
|
|
|
|
# Setup
|
|
f=/sys/kernel/debug/lkmc_fops
|
|
insmod fops.ko
|
|
|
|
# read
|
|
[ "$(cat "$f")" = abcd ]
|
|
|
|
# write
|
|
printf 01 > "$f"
|
|
[ "$(cat "$f")" = 01cd ]
|
|
|
|
# ENOSPC
|
|
printf abcd > "$f"
|
|
set +e
|
|
printf 12345 > "$f"
|
|
exit_status="$?"
|
|
set -e
|
|
[ "$exit_status" -eq 8 ]
|
|
[ "$(cat "$f")" = abcd ]
|
|
|
|
# seek
|
|
printf 1234 > "$f"
|
|
printf z | dd bs=1 of="$f" seek=2
|
|
[ "$(cat "$f")" = 12z4 ]
|
|
|
|
# Teardown
|
|
rmmod fops
|