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Message-ID: <20190221051634.GC11758@eros.localdomain>
Date: Thu, 21 Feb 2019 16:16:34 +1100
From: "Tobin C. Harding" <me@...in.cc>
To: Kees Cook <keescook@...omium.org>
Cc: "Tobin C. Harding" <tobin@...nel.org>, Shuah Khan <shuah@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] lib/string: Enable string selftesting
On Wed, Feb 20, 2019 at 03:57:18PM -0800, Kees Cook wrote:
> On Mon, Feb 18, 2019 at 3:24 PM Tobin C. Harding <tobin@...nel.org> wrote:
> >
> > Currently we have a test module but it is not tied into the kselftest
> > infrastructure. In preparation for adding string manipulation functions
> > and testing we should enable kselftest to utilize the test module.
> >
> > Enable string testing via kselftest infrastructure.
> >
> > Signed-off-by: Tobin C. Harding <tobin@...nel.org>
> > ---
> > lib/Kconfig.debug | 14 ++++++++++++++
> > lib/Makefile | 2 +-
> > lib/test_string.c | 4 ++--
> > tools/testing/selftests/lib/Makefile | 2 +-
> > tools/testing/selftests/lib/config | 1 +
> > tools/testing/selftests/lib/string.sh | 19 +++++++++++++++++++
> > 6 files changed, 38 insertions(+), 4 deletions(-)
> > create mode 100755 tools/testing/selftests/lib/string.sh
> >
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index d4df5b24d75e..0dca64c1d8a4 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -1802,8 +1802,22 @@ config ASYNC_RAID6_TEST
> > config TEST_HEXDUMP
> > tristate "Test functions located in the hexdump module at runtime"
> >
> > +config TEST_STRING
> > + tristate "Perform selftest on string manipulation functions"
> > + default n
> > + help
> > + Enable this option to test string manipulation functions.
> > + Currently this only tests memset_{16,32,64}.
> > +
> > + If unsure, say N.
> > +
> > config TEST_STRING_HELPERS
> > tristate "Test functions located in the string_helpers module at runtime"
> > + default n
> > + help
> > + Enable this option to unit test code in lib/string_helpers.c
> > +
> > + If unsure, say N.
> >
> > config TEST_KSTRTOX
> > tristate "Test kstrto*() family of functions at runtime"
> > diff --git a/lib/Makefile b/lib/Makefile
> > index e1b59da71418..9c30e1fee27f 100644
> > --- a/lib/Makefile
> > +++ b/lib/Makefile
> > @@ -39,7 +39,7 @@ obj-y += bcd.o div64.o sort.o parser.o debug_locks.o random32.o \
> > bsearch.o find_bit.o llist.o memweight.o kfifo.o \
> > percpu-refcount.o rhashtable.o reciprocal_div.o \
> > once.o refcount.o usercopy.o errseq.o bucket_locks.o
> > -obj-$(CONFIG_STRING_SELFTEST) += test_string.o
> > +obj-$(CONFIG_TEST_STRING) += test_string.o
>
> This patch should remove 'config STRING_SELFTEST' from lib/Kconfig too.
>
> > diff --git a/tools/testing/selftests/lib/Makefile b/tools/testing/selftests/lib/Makefile
> > index 70d5711e3ac8..2ee4559b277e 100644
> > --- a/tools/testing/selftests/lib/Makefile
> > +++ b/tools/testing/selftests/lib/Makefile
> > @@ -3,6 +3,6 @@
> > # No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
> > all:
> >
> > -TEST_PROGS := printf.sh bitmap.sh prime_numbers.sh
> > +TEST_PROGS := printf.sh bitmap.sh prime_numbers.sh string.sh
> >
> > include ../lib.mk
> > diff --git a/tools/testing/selftests/lib/config b/tools/testing/selftests/lib/config
> > index 126933bcc950..2032402ad409 100644
> > --- a/tools/testing/selftests/lib/config
> > +++ b/tools/testing/selftests/lib/config
> > @@ -1,3 +1,4 @@
> > CONFIG_TEST_PRINTF=m
> > CONFIG_TEST_BITMAP=m
> > +CONFIG_TEST_STRING=m
> > CONFIG_PRIME_NUMBERS=m
> > diff --git a/tools/testing/selftests/lib/string.sh b/tools/testing/selftests/lib/string.sh
> > new file mode 100755
> > index 000000000000..99024b6f3a6a
> > --- /dev/null
> > +++ b/tools/testing/selftests/lib/string.sh
> > @@ -0,0 +1,19 @@
> > +#!/bin/sh
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Runs string manipulation tests using test_string kernel module
> > +
> > +# Kselftest framework requirement - SKIP code is 4.
> > +ksft_skip=4
> > +
> > +if ! /sbin/modprobe -q -n test_string; then
> > + echo "string: module test_string is not found [SKIP]"
> > + exit $ksft_skip
> > +fi
> > +
> > +if /sbin/modprobe -q test_string; then
> > + /sbin/modprobe -q -r test_string
> > + echo "string: ok"
> > +else
> > + echo "string: [FAIL]"
> > + exit 1
> > +fi
> > --
> > 2.20.1
> >
>
> You mentioned "redundant scripts" here. You might want to refactor
> first, and have a common tool that does the core testing, and then
> have the scripts doing one line each:
>
> i.e.:
>
> #!/bin/bash
> exec./test_module.sh prime_numbers selftest=65536
>
> with "test_module.sh" doing all the rest.
>
> I bet there are other test_*.ko tests we could wire up too, and this
> refactor will make that much easier. And actually, maybe we should
> just have a single test running that just reads the "config" file for
> the list of test modules, and runs them with the correct output format
> to show which are skipped, etc.
Got it. I'll have a go at all this and pre-pend it to v2.
thanks,
Tobin.
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