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9308f2f9e7
The existing tools/testing/selftests/sysctl/ tests include two test cases, but these use existing production kernel sysctl interfaces. We want to expand test coverage but we can't just be looking for random safe production values to poke at, that's just insane! Instead just dedicate a test driver for debugging purposes and port the existing scripts to use it. This will make it easier for further tests to be added. Subsequent patches will extend our test coverage for sysctl. The stress test driver uses a new license (GPL on Linux, copyleft-next outside of Linux). Linus was fine with this [0] and later due to Ted's and Alans's request ironed out an "or" language clause to use [1] which is already present upstream. [0] https://lkml.kernel.org/r/CA+55aFyhxcvD+q7tp+-yrSFDKfR0mOHgyEAe=f_94aKLsOu0Og@mail.gmail.com [1] https://lkml.kernel.org/r/1495234558.7848.122.camel@linux.intel.com Link: http://lkml.kernel.org/r/20170630224431.17374-2-mcgrof@kernel.org Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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/debug/test_sysctl/"
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TARGET="${SYSCTL}/string_0001"
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ORIG=$(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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