102 lines
2.4 KiB
Plaintext
102 lines
2.4 KiB
Plaintext
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Test tracefs GID mount option
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# requires: "[gid=<gid>]":README
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fail() {
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local msg="$1"
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echo "FAILED: $msg"
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exit_fail
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}
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find_alternate_gid() {
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local original_gid="$1"
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tac /etc/group | grep -v ":$original_gid:" | head -1 | cut -d: -f3
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}
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mount_tracefs_with_options() {
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local mount_point="$1"
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local options="$2"
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mount -t tracefs -o "$options" nodev "$mount_point"
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setup
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}
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unmount_tracefs() {
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local mount_point="$1"
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# Need to make sure the mount isn't busy so that we can umount it
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(cd $mount_point; finish_ftrace;)
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cleanup
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}
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create_instance() {
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local mount_point="$1"
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local instance="$mount_point/instances/$(mktemp -u test-XXXXXX)"
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mkdir "$instance"
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echo "$instance"
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}
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remove_instance() {
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local instance="$1"
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rmdir "$instance"
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}
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check_gid() {
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local mount_point="$1"
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local expected_gid="$2"
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echo "Checking permission group ..."
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cd "$mount_point"
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for file in "." "events" "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable"; do
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local gid=`stat -c "%g" $file`
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if [ "$gid" -ne "$expected_gid" ]; then
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cd - # Return to the previous working directory (tracefs root)
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fail "$(realpath $file): Expected group $expected_gid; Got group $gid"
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fi
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done
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cd - # Return to the previous working directory (tracefs root)
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}
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test_gid_mount_option() {
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local mount_point=$(get_mount_point)
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local mount_options=$(get_mnt_options "$mount_point")
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local original_group=$(stat -c "%g" .)
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local other_group=$(find_alternate_gid "$original_group")
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# Set up mount options with new GID for testing
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local new_options=`echo "$mount_options" | sed -e "s/gid=[0-9]*/gid=$other_group/"`
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if [ "$new_options" = "$mount_options" ]; then
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new_options="$mount_options,gid=$other_group"
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mount_options="$mount_options,gid=$original_group"
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fi
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# Unmount existing tracefs instance and mount with new GID
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unmount_tracefs "$mount_point"
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mount_tracefs_with_options "$mount_point" "$new_options"
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check_gid "$mount_point" "$other_group"
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# Check that files created after the mount inherit the GID
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local instance=$(create_instance "$mount_point")
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check_gid "$instance" "$other_group"
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remove_instance "$instance"
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# Unmount and remount with the original GID
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unmount_tracefs "$mount_point"
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mount_tracefs_with_options "$mount_point" "$mount_options"
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check_gid "$mount_point" "$original_group"
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}
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test_gid_mount_option
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exit 0
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