134 lines · bash
1#!/bin/sh2# SPDX-License-Identifier: GPL-2.03#4# Test for mishandling of splice() on pseudofilesystems, which should catch5# bugs like 11990a5bd7e5 ("module: Correctly truncate sysfs sections output")6#7# Since splice fallback was removed as part of the set_fs() rework, many of these8# tests expect to fail now. See https://lore.kernel.org/lkml/202009181443.C2179FB@keescook/9set -e10 11DIR=$(dirname "$0")12 13ret=014 15expect_success()16{17 title="$1"18 shift19 20 echo "" >&221 echo "$title ..." >&222 23 set +e24 "$@"25 rc=$?26 set -e27 28 case "$rc" in29 0)30 echo "ok: $title succeeded" >&231 ;;32 1)33 echo "FAIL: $title should work" >&234 ret=$(( ret + 1 ))35 ;;36 *)37 echo "FAIL: something else went wrong" >&238 ret=$(( ret + 1 ))39 ;;40 esac41}42 43expect_failure()44{45 title="$1"46 shift47 48 echo "" >&249 echo "$title ..." >&250 51 set +e52 "$@"53 rc=$?54 set -e55 56 case "$rc" in57 0)58 echo "FAIL: $title unexpectedly worked" >&259 ret=$(( ret + 1 ))60 ;;61 1)62 echo "ok: $title correctly failed" >&263 ;;64 *)65 echo "FAIL: something else went wrong" >&266 ret=$(( ret + 1 ))67 ;;68 esac69}70 71do_splice()72{73 filename="$1"74 bytes="$2"75 expected="$3"76 report="$4"77 78 out=$("$DIR"/splice_read "$filename" "$bytes" | cat)79 if [ "$out" = "$expected" ] ; then80 echo " matched $report" >&281 return 082 else83 echo " no match: '$out' vs $report" >&284 return 185 fi86}87 88test_splice()89{90 filename="$1"91 92 echo " checking $filename ..." >&293 94 full=$(cat "$filename")95 rc=$?96 if [ $rc -ne 0 ] ; then97 return 298 fi99 100 two=$(echo "$full" | grep -m1 . | cut -c-2)101 102 # Make sure full splice has the same contents as a standard read.103 echo " splicing 4096 bytes ..." >&2104 if ! do_splice "$filename" 4096 "$full" "full read" ; then105 return 1106 fi107 108 # Make sure a partial splice see the first two characters.109 echo " splicing 2 bytes ..." >&2110 if ! do_splice "$filename" 2 "$two" "'$two'" ; then111 return 1112 fi113 114 return 0115}116 117### /proc/$pid/ has no splice interface; these should all fail.118expect_failure "proc_single_open(), seq_read() splice" test_splice /proc/$$/limits119expect_failure "special open(), seq_read() splice" test_splice /proc/$$/comm120 121### /proc/sys/ has a splice interface; these should all succeed.122expect_success "proc_handler: proc_dointvec_minmax() splice" test_splice /proc/sys/fs/nr_open123expect_success "proc_handler: proc_dostring() splice" test_splice /proc/sys/kernel/modprobe124expect_success "proc_handler: special read splice" test_splice /proc/sys/kernel/version125 126### /sys/ has no splice interface; these should all fail.127if ! [ -d /sys/module/test_module/sections ] ; then128 expect_success "test_module kernel module load" modprobe test_module129fi130expect_success "kernfs attr splice" test_splice /sys/module/test_module/coresize131expect_success "kernfs binattr splice" test_splice /sys/module/test_module/sections/.init.text132 133exit $ret134