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>
132 lines
2.3 KiB
Bash
132 lines
2.3 KiB
Bash
#!/bin/sh
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TEST_FILE=$(mktemp)
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echo "== Testing sysctl behavior against ${TARGET} =="
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set_orig()
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{
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echo "${ORIG}" > "${TARGET}"
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}
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set_test()
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{
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echo "${TEST_STR}" > "${TARGET}"
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}
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verify()
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{
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local seen
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seen=$(cat "$1")
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if [ "${seen}" != "${TEST_STR}" ]; 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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exit_test()
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{
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if [ ! -z ${old_strict} ]; then
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echo ${old_strict} > ${WRITES_STRICT}
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fi
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exit $rc
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}
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trap 'set_orig; rm -f "${TEST_FILE}"' EXIT
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rc=0
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echo -n "Writing test file ... "
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echo "${TEST_STR}" > "${TEST_FILE}"
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if ! verify "${TEST_FILE}"; then
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echo "FAIL" >&2
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exit 1
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else
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echo "ok"
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fi
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echo -n "Checking sysctl is not set to test value ... "
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if verify "${TARGET}"; then
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echo "FAIL" >&2
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exit 1
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else
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echo "ok"
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fi
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echo -n "Writing sysctl from shell ... "
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set_test
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if ! verify "${TARGET}"; then
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echo "FAIL" >&2
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exit 1
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else
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echo "ok"
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fi
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echo -n "Resetting sysctl to original value ... "
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set_orig
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if verify "${TARGET}"; then
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echo "FAIL" >&2
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exit 1
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else
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echo "ok"
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fi
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echo -n "Checking write strict setting ... "
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WRITES_STRICT="${SYSCTL}/kernel/sysctl_writes_strict"
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if [ ! -e ${WRITES_STRICT} ]; then
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echo "FAIL, but skip in case of old kernel" >&2
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else
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old_strict=$(cat ${WRITES_STRICT})
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if [ "$old_strict" = "1" ]; then
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echo "ok"
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else
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echo "FAIL, strict value is 0 but force to 1 to continue" >&2
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echo "1" > ${WRITES_STRICT}
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fi
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fi
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# Now that we've validated the sanity of "set_test" and "set_orig",
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# we can use those functions to set starting states before running
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# specific behavioral tests.
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echo -n "Writing entire sysctl in single write ... "
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set_orig
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dd if="${TEST_FILE}" of="${TARGET}" bs=4096 2>/dev/null
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if ! verify "${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 synchronized seek ... "
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set_test
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dd if="${TEST_FILE}" of="${TARGET}" bs=1 seek=1 skip=1 2>/dev/null
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if ! verify "${TARGET}"; then
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echo "FAIL" >&2
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rc=1
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else
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echo "ok"
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fi
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echo -n "Writing beyond end of sysctl ... "
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set_orig
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dd if="${TEST_FILE}" of="${TARGET}" bs=20 seek=2 2>/dev/null
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if verify "${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 sysctl with multiple long writes ... "
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set_orig
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(perl -e 'print "A" x 50;'; echo "${TEST_STR}") | \
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dd of="${TARGET}" bs=50 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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