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Full Discussion: Invalid Read access
Top Forums Programming Invalid Read access Post 302985766 by SA_Palani on Tuesday 15th of November 2016 12:51:58 AM
Old 11-15-2016
Invalid Read access

Hi All,

I would like to know how the valgrind find the runtime allocation related issues?such as the below

Code:
invalid read of size 4.
Invalid write of size 4.

Even the size of memory is known at runtime,valgrind reports this

I am asking this since i got an issue which is trying to access unknown memory and that size is declared at compile time.
memcpy() statement throws
Code:
Invalid read error

.


Thank you


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 11-15-2016 at 07:44 AM.. Reason: Added CODE tags.
 

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Test::Valgrind::Suppressions(3pm)			User Contributed Perl Documentation			 Test::Valgrind::Suppressions(3pm)

NAME
Test::Valgrind::Suppressions - Generate suppressions for given tool and command. VERSION
Version 1.13 DESCRIPTION
This module is an helper for generating suppressions. METHODS
"generate tool => $tool, command => $command, target => $target" Generates suppressions for the command "$command->new_trainer" and the tool "$tool->new_trainer", and writes them in the file specified by $target. The action used behind the scenes is Test::Valgrind::Action::Suppressions. Returns the status code. "strip_tail $session, $suppression" Removes all wildcard frames at the end of the suppression. Moreover, '...' is appended when "valgrind" 3.4.0 or higher is used. Returns the mangled suppression. "maybe_z_demangle $symbol" If $symbol is Z-encoded as described in "valgrind"'s include/pub_tool_redir.h, extract and decode its function name part. Otherwise, $symbol is returned as is. This routine follows "valgrind"'s coregrind/m_demangle/demangle.c:maybe_Z_demangle. SEE ALSO
Test::Valgrind, Test::Valgrind::Command, Test::Valgrind::Tool, Test::Valgrind::Action::Suppressions. AUTHOR
Vincent Pit, "<perl at profvince.com>", <http://www.profvince.com>. You can contact me by mail or on "irc.perl.org" (vincent). BUGS
Please report any bugs or feature requests to "bug-test-valgrind-suppressions at rt.cpan.org", or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Valgrind <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Valgrind>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. SUPPORT
You can find documentation for this module with the perldoc command. perldoc Test::Valgrind::Suppressions COPYRIGHT &; LICENSE Copyright 2008,2009,2010,2011 Vincent Pit, all rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.4 2011-08-25 Test::Valgrind::Suppressions(3pm)
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