On Sun, Dec 30, 2018 at 5:27 PM Niels Möller <[email protected]> wrote:
>
> Jeffrey Walton <[email protected]> writes:
>
> > I'm trying to build Nettle 3.4.1 on Fedora 29, x64 (fully patched).
> > Self tests are failing at:
> >
> > PASS: rsa-sec-decrypt
> > sec_powm.c:293: GNU MP assertion failed: enb >= windowsize
> > ../run-tests: line 57: 22997 Aborted (core dumped) "$1" $testflags
> > FAIL: rsa-compute-root
> > PASS: dsa
> > PASS: dsa-keygen
>
> This is an ASSERT_ALWAYS in gmp's mpn/generic/sec_powm.c, checking the
> return value from the win_size function. To debug, it would be helpful
> to know
Here are the options I used to build GMP 6.1.2 and Nettle 3.1.4. It
looks fairly easy to duplicate on 64-bit platforms.
BUILD_BITS: 64-bits
INSTX_PREFIX: /usr/local
INSTX_LIBDIR: /usr/local/lib64
PKGCONFPATH: /usr/local/lib64/pkgconfig
CPPFLAGS: -I/usr/local/include -DNDEBUG
CFLAGS: -g2 -O2 -march=native -fPIC
CXXFLAGS: -g2 -O2 -march=native -fPIC
LDFLAGS: -L/usr/local/lib64 -Wl,-R,/usr/local/lib64 -Wl,--enable-new-dtags
LDLIBS: -ldl -lpthread
Then, I run configure. There's nothing special about what I am doing.
I'm just getting into a Release Build state.
> 1. The value of enb and windowsize at the crash.
>
> 2. The definition of POWM_SEC_TABLE (defined in the platform specific
> gmp-mparam.h), and used by the win_size function in this file.
>
> To me, it looks like the assert validates that POWM_SEC_TABLE conforms
> to expectations.
>
> It might also be a bug in the book-keeping of scratch space, leading to
> some memory overwrite. Try running the test program under valgrind
> and/or asan?
Thanks Niels.
I'll try to get to it later tonight or tomorrow.
In the meantime you might provide your test data to GMP. It looks like
it would make a good test case for them.
Jeff
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