Commit 9af47666 authored by Kees Cook's avatar Kees Cook
Browse files

selftests: splice: Check behavior of full and short splices 



In order to help catch regressions in splice vs read behavior in certain
special files, test a few with various different kinds of internal
kernel helpers.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 11990a5b

tools/testing/selftests/splice/.gitignore

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# SPDX-License-Identifier: GPL-2.0-only

default_file_splice_read

splice_read

tools/testing/selftests/splice/Makefile

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# SPDX-License-Identifier: GPL-2.0

TEST_PROGS := default_file_splice_read.sh

TEST_GEN_PROGS_EXTENDED := default_file_splice_read

TEST_PROGS := default_file_splice_read.sh short_splice_read.sh

TEST_GEN_PROGS_EXTENDED := default_file_splice_read splice_read



include ../lib.mk

tools/testing/selftests/splice/config

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CONFIG_TEST_LKM=m

tools/testing/selftests/splice/settings

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timeout=5

tools/testing/selftests/splice/short_splice_read.sh

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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

set -e



ret=0



do_splice()

{

	filename="$1"

	bytes="$2"

	expected="$3"



	out=$(./splice_read "$filename" "$bytes" | cat)

	if [ "$out" = "$expected" ] ; then

		echo "ok: $filename $bytes"

	else

		echo "FAIL: $filename $bytes"

		ret=1

	fi

}



test_splice()

{

	filename="$1"



	full=$(cat "$filename")

	two=$(echo "$full" | grep -m1 . | cut -c-2)



	# Make sure full splice has the same contents as a standard read.

	do_splice "$filename" 4096 "$full"



	# Make sure a partial splice see the first two characters.

	do_splice "$filename" 2 "$two"

}



# proc_single_open(), seq_read()

test_splice /proc/$$/limits

# special open, seq_read()

test_splice /proc/$$/comm



# proc_handler, proc_dointvec_minmax

test_splice /proc/sys/fs/nr_open

# proc_handler, proc_dostring

test_splice /proc/sys/kernel/modprobe

# proc_handler, special read

test_splice /proc/sys/kernel/version



if ! [ -d /sys/module/test_module/sections ] ; then

	modprobe test_module

fi

# kernfs, attr

test_splice /sys/module/test_module/coresize

# kernfs, binattr

test_splice /sys/module/test_module/sections/.init.text



exit $ret