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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d644437a1d
Sysctl test will fail in some items if the value of /proc/sys/kernel /sysctrl_writes_strict is 0 as the default value in kernel older than v4.5. Make this test more robus and compatible with older kernel by checking and update writes_strict value and restore it when test is done. Signed-off-by: Orson Zhai <orson.zhai@linaro.org> Reviewed-by: Sumit Semwal <sumit.semwal@linaro.org> Tested-by: Sumit Semwal <sumit.semwal@linaro.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
78 lines
1.6 KiB
Bash
Executable File
78 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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SYSCTL="/proc/sys"
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TARGET="${SYSCTL}/kernel/domainname"
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ORIG=$(cat "${TARGET}")
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TEST_STR="Testing sysctl"
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. ./common_tests
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# Only string sysctls support seeking/appending.
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MAXLEN=65
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echo -n "Writing entire sysctl in short writes ... "
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set_orig
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dd if="${TEST_FILE}" of="${TARGET}" bs=1 2>/dev/null
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if ! verify "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Writing middle of sysctl after unsynchronized seek ... "
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set_test
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dd if="${TEST_FILE}" of="${TARGET}" bs=1 seek=1 2>/dev/null
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if verify "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Checking sysctl maxlen is at least $MAXLEN ... "
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set_orig
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perl -e 'print "A" x ('"${MAXLEN}"'-2), "B";' | \
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dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null
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if ! grep -q B "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Checking sysctl keeps original string on overflow append ... "
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set_orig
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perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \
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dd of="${TARGET}" bs=$(( MAXLEN - 1 )) 2>/dev/null
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if grep -q B "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Checking sysctl stays NULL terminated on write ... "
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set_orig
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perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \
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dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null
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if grep -q B "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Checking sysctl stays NULL terminated on overwrite ... "
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set_orig
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perl -e 'print "A" x ('"${MAXLEN}"'-1), "BB";' | \
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dd of="${TARGET}" bs=$(( $MAXLEN + 1 )) 2>/dev/null
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if grep -q B "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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exit_test
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