segmentation error while using mpz_powm in a loop

shrims4u

the value of array[i] is a bignumber.... Also d and n are initialised... The error is at mpz_powm.... you want me to write the values in numbers???? Actually it differs each time according to the message

David Crow

My, point, although subtle, was to ensure that the values you are passing to that function are valid. Some functions/libraries place the onus of validation solely on the caller (rather than handle the bad input and fail gracefully)

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shrims4u

yah the values that are passed are proper... The gdb output is as follows.... [New Thread -1208882288 (LWP 9012)] [New Thread -1208879424 (LWP 9009)] [New Thread -1219372144 (LWP 9017)] GNU MP: Cannot allocate memory (size=3368600780) Program received signal SIGABRT, Aborted. [Switching to Thread -1219372144 (LWP 9017)] 0x00110402 in __kernel_vsyscall ()

shrims4u

Also i get this message from gdb..... Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1218634864 (LWP 9064)] 0x06d0199c in __gmpz_powm () from /usr/lib/sse2/libgmp.so.3

jeron1

You certainly did not deserve to be down voted for that response.

molesworth

shrims4u wrote:

GNU MP: Cannot allocate memory (size=3368600780)

I would guess that this is related to the problem. It's tried to allocate 3 Gb of memory, and failed... As to why it's trying to allocate such a big chunk of memory, I couldn't say, but maybe stepping through until you get that error might help pin it down.

There are three kinds of people in the world - those who can count and those who can't...

shrims4u

i dint understand??? wat is down voting???

shrims4u

ill mail the whole program to uall Actually it is a milter which decrypts the incoming mail messages... /* sample_milter - example mail filter module ** ** Copyright © 2004 by Jef Poskanzer . ** All rights reserved. ** ** Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions ** are met: ** 1. Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** 2. Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in the ** documentation and/or other materials provided with the distribution. ** ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ** SUCH DAMAGE. ** ** For commentary on this license please see http://www.acme.com/license.html */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "libmilter/mfapi.h" ////////////////////////////////////////////////////////////// #include "gmp.h" /* Forwards. */ static void usage( void ); static sfsistat sample_connect( SMFICTX* ctx, char* connhost, _SOCK_ADDR* connaddr ); static sfsistat sample_helo( SMFICTX* ctx, char* helohost ); static sfsistat sample_envfrom( SMFICTX* ctx, char** fromargs ); static sfsistat sample_envrcpt( SMFICTX* ctx, char** rcptargs ); static sfsistat sample_header( SMFICTX* ctx, char* name, char* value ); static sfsistat sample_eoh( SMFICTX* ctx ); static sfsistat sample_body( SMFICT

jeron1

When a response receives a 1 vote (located at the bottom right of the response).

shrims4u

will you please help me??? you understood my problem?

shrims4u

I dint understand what you want me to do...

molesworth

Somewhere the program is trying to allocate a very large amount of memory. This is, I think, the cause of your problem. I haven't used this library/package, but I'm basing my conclusion on the error mesage you posted (see my last reply). What I suggest is that you use a debugging tool to step through the program until it generates that error, and take a close look at exactly what is happening at that point. Or post here exactly which line is causing the problem.

There are three kinds of people in the world - those who can count and those who can't...