Valgrind is reporting the use of uninitialised value(s) in
__gmpz_powm_sec for i686 host, though I found no similar issue for
x86_64 host. This issue started in 6.3.0, and was not there for 6.2.1.
Please find the details below.
Best regards,
Trevor Spiteri
GMP version 6.3.0 (unpatched) configured on an x86_64 build system using:
gmp-6.3.0/configure --host i686
Configure prints:
configure: summary of build options:
Version: GNU MP 6.3.0
Host type: i686-pc-none
ABI: 32
Install prefix: /usr/local
Compiler: gcc
Static libraries: yes
Shared libraries: no
Contents of a.c:
#include <gmp.h>
int main(void)
{
mpz_t base, exp, mod, ret;
int error_code;
mpz_init_set_ui(base, 7);
mpz_init_set_ui(exp, 4);
mpz_init_set_ui(mod, 13);
mpz_init(ret);
mpz_powm_sec(ret, base, exp, mod);
if (mpz_cmp_ui(ret, 9))
error_code = 1;
else
error_code = 0;
mpz_clear(ret);
mpz_clear(mod);
mpz_clear(exp);
mpz_clear(base);
return error_code;
}
Compiled using:
gcc -m32 a.c -I . -L .libs -lgmp
Executing ./a.out returns no error. But "valgrind ./a.out" reports:
==207620== Memcheck, a memory error detector
==207620== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==207620== Using Valgrind-3.21.0 and LibVEX; rerun with -h for copyright info
==207620== Command: ./a.out
==207620==
==207620== Conditional jump or move depends on uninitialised value(s)
==207620== at 0x8049489: __gmpz_powm_sec (in
/home/trevor/scratch/val_gmp/a.out)
==207620== by 0x804923D: main (in /home/trevor/scratch/val_gmp/a.out)
==207620==
==207620== Conditional jump or move depends on uninitialised value(s)
==207620== at 0x8049309: __gmpz_cmp_ui (in
/home/trevor/scratch/val_gmp/a.out)
==207620== by 0x804924E: main (in /home/trevor/scratch/val_gmp/a.out)
==207620==
==207620== Conditional jump or move depends on uninitialised value(s)
==207620== at 0x8049254: main (in /home/trevor/scratch/val_gmp/a.out)
==207620==
==207620==
==207620== HEAP SUMMARY:
==207620== in use at exit: 0 bytes in 0 blocks
==207620== total heap usage: 4 allocs, 4 frees, 16 bytes allocated
==207620==
==207620== All heap blocks were freed -- no leaks are possible
==207620==
==207620== Use --track-origins=yes to see where uninitialised values come from
==207620== For lists of detected and suppressed errors, rerun with: -s
==207620== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)
Additional information:
Distribution:
Fedora 38
gcc-v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-gcc-major-version-only --enable-libstdcxx-backtrace
--with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu
--enable-plugin --enable-initfini-array
--with-isl=/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/isl-install
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-offload-defaulted --enable-gnu-indirect-function --enable-cet
--with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
--with-build-config=bootstrap-lto --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.1 20230728 (Red Hat 13.2.1-1) (GCC)
uname -a:
Linux hawat 6.4.11-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Aug 16 17:42:12
UTC 2023 x86_64 GNU/Linux
gmp-6.3.0/config.guess:
nehalem-pc-linux-gnu
sh gmp-6.3.0/configfsf.guess:
x86_64-pc-linux-gnu
valgrind --version:
valgrind-3.21.0
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