Re: POST large amount of data causes segmentation fault

[tomcat/perl]

On 09.02.2020 16:26, Vincent Veyron wrote:

On Sun, 9 Feb 2020 10:57:04 +
Scott Alexander  wrote:


I meant I'm posting data from a form, javascript is collecting a series of numbers 
from a  as a string.


Not really clear what happens here? I guess Javascript writes the content of 
the text input?


Javascript seperates each number with a '/' then I use split within Perl to get 
the list of numbers into an array.



I have a  with list of users and GSM numbers. If that list is about 600 
users it has worked fine. I was testing with about 4000 users when I came across this 
problem.



I just tried the line of code you posted earlier (@number = split /\//, 
$req->param("numbers")) on a form that I use, it processes a text input of 50 
000 ten digit numbers separated by a slash with no problem.

I use Apache/2.4.25 (Debian), libapache2-mod-per 2.0.10-2+deb9u and 
libapache2-request-perl 2.13-7~deb9u1



Might it not have something to do with the *format* used for the POST (from javascript / 
). I mean

Content-type : application/x-www-form-urlencoded
or
Content-type : multipart/form-data
or even
Content-type : text/plain

The parser for that data is certainly different on the server side, and one may be running 
against different limits/quirks.


of course a segfault is not nice anyway..

Re (e.g.9 . 
https://dev.to/sidthesloth92/understanding-html-form-encoding-url-encoded-and-multipart-forms-3lpa

Re: POST large amount of data causes segmentation fault

[Ruben Safir]

On Sun, Feb 09, 2020 at 04:26:31PM +0100, Vincent Veyron wrote:
> On Sun, 9 Feb 2020 10:57:04 +
> Scott Alexander  wrote:
> 
> > I meant I'm posting data from a form, javascript is collecting a series of 
> > numbers from a  as a string.
> 
> Not really clear what happens here? I guess Javascript writes the content of 
> the text input?
> 
> > Javascript seperates each number with a '/' then I use split within Perl to 
> > get the list of numbers into an array.
> 


First of all, split uses a regex and this is not searching for anything
other than empty strings... I think

or maybe I am dislexic

You might need a need the regex {^\d.*}
or [^0-9]

or better - don't use split and hunt for digits specifically and secure
your input code

Also, print out fdat and see what you are actually generating and don
t swim in dark holes :)


> > I have a  with list of users and GSM numbers. If that list is about 
> > 600 users it has worked fine. I was testing with about 4000 users when I 
> > came across this problem.
> > 
> 
> I just tried the line of code you posted earlier (@number = split /\//, 
> $req->param("numbers")) on a form that I use, it processes a text input of 50 
> 000 ten digit numbers separated by a slash with no problem.
> 
> I use Apache/2.4.25 (Debian), libapache2-mod-per 2.0.10-2+deb9u and 
> libapache2-request-perl 2.13-7~deb9u1
> 
> 
> 
> -- 
> 
>   Bien à vous, Vincent Veyron
> 
> https://marica.fr/
> Logiciel de gestion des sinistres assurances, des dossiers contentieux et des 
> contrats pour le service juridique

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