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133 lines
2.8 KiB
133 lines
2.8 KiB
#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Test for mishandling of splice() on pseudofilesystems, which should catch |
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# bugs like 11990a5bd7e5 ("module: Correctly truncate sysfs sections output") |
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# |
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# Since splice fallback was removed as part of the set_fs() rework, many of these |
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# tests expect to fail now. See https://lore.kernel.org/lkml/202009181443.C2179FB@keescook/ |
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set -e |
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DIR=$(dirname "$0") |
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ret=0 |
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expect_success() |
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{ |
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title="$1" |
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shift |
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echo "" >&2 |
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echo "$title ..." >&2 |
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set +e |
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"$@" |
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rc=$? |
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set -e |
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case "$rc" in |
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0) |
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echo "ok: $title succeeded" >&2 |
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;; |
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1) |
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echo "FAIL: $title should work" >&2 |
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ret=$(( ret + 1 )) |
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;; |
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*) |
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echo "FAIL: something else went wrong" >&2 |
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ret=$(( ret + 1 )) |
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;; |
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esac |
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} |
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expect_failure() |
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{ |
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title="$1" |
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shift |
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echo "" >&2 |
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echo "$title ..." >&2 |
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set +e |
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"$@" |
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rc=$? |
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set -e |
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case "$rc" in |
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0) |
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echo "FAIL: $title unexpectedly worked" >&2 |
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ret=$(( ret + 1 )) |
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;; |
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1) |
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echo "ok: $title correctly failed" >&2 |
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;; |
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*) |
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echo "FAIL: something else went wrong" >&2 |
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ret=$(( ret + 1 )) |
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;; |
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esac |
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} |
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do_splice() |
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{ |
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filename="$1" |
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bytes="$2" |
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expected="$3" |
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report="$4" |
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out=$("$DIR"/splice_read "$filename" "$bytes" | cat) |
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if [ "$out" = "$expected" ] ; then |
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echo " matched $report" >&2 |
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return 0 |
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else |
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echo " no match: '$out' vs $report" >&2 |
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return 1 |
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fi |
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} |
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test_splice() |
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{ |
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filename="$1" |
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echo " checking $filename ..." >&2 |
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full=$(cat "$filename") |
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rc=$? |
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if [ $rc -ne 0 ] ; then |
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return 2 |
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fi |
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two=$(echo "$full" | grep -m1 . | cut -c-2) |
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# Make sure full splice has the same contents as a standard read. |
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echo " splicing 4096 bytes ..." >&2 |
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if ! do_splice "$filename" 4096 "$full" "full read" ; then |
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return 1 |
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fi |
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# Make sure a partial splice see the first two characters. |
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echo " splicing 2 bytes ..." >&2 |
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if ! do_splice "$filename" 2 "$two" "'$two'" ; then |
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return 1 |
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fi |
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return 0 |
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} |
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### /proc/$pid/ has no splice interface; these should all fail. |
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expect_failure "proc_single_open(), seq_read() splice" test_splice /proc/$$/limits |
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expect_failure "special open(), seq_read() splice" test_splice /proc/$$/comm |
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### /proc/sys/ has a splice interface; these should all succeed. |
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expect_success "proc_handler: proc_dointvec_minmax() splice" test_splice /proc/sys/fs/nr_open |
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expect_success "proc_handler: proc_dostring() splice" test_splice /proc/sys/kernel/modprobe |
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expect_success "proc_handler: special read splice" test_splice /proc/sys/kernel/version |
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### /sys/ has no splice interface; these should all fail. |
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if ! [ -d /sys/module/test_module/sections ] ; then |
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expect_success "test_module kernel module load" modprobe test_module |
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fi |
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expect_failure "kernfs attr splice" test_splice /sys/module/test_module/coresize |
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expect_failure "kernfs binattr splice" test_splice /sys/module/test_module/sections/.init.text |
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exit $ret
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