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Bug 18854 - Protect from DOS 

There was a bug that meant a very large offset in the search params
will cause the search script to run forever (or long enough to crash
the machine)

To test

1/ Get ready with sudo top so you can kill the thread before it causes
your machine to OOM
2/ Hit a page like yourdomain.com/cgi-bin/koha/opac-search.pl?q=1&offset=-9999999999999999999
3/ Notice the process runs for a long time
4/ Kill the process
5/ Apply the patch
6/ Hit the page again, notice the it loads (offset is set to zero)
7/ Do the same to search in the staff client

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Amended: changed -2 to 0 in opac-search.pl.
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 99b32717cd)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
This commit is contained in:
Chris Cormack 2017-06-25 17:34:12 +12:00 committed by Fridolin Somers
parent cffb4a26b3
commit a64d14db20
2 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
catalogue/search.pl
View File

@ -449,6 +449,7 @@ my $scan = $params->{'scan'};
my $count = C4::Context->preference('numSearchResults') || 20;
my $results_per_page = $params->{'count'} || $count;
my $offset = $params->{'offset'} || 0;
$offset = 0 if $offset < 0;
my $page = $cgi->param('page') || 1;
#my $offset = ($page-1)*$results_per_page;
my $hits;

1
opac/opac-search.pl
View File

@ -520,6 +520,7 @@ my $count = C4::Context->preference('OPACnumSearchResults') || 20;
my $countRSS = C4::Context->preference('numSearchRSSResults') || 50;
my $results_per_page = $params->{'count'} || $count;
my $offset = $params->{'offset'} || 0;
$offset = 0 if $offset < 0;
my $page = $cgi->param('page') || 1;
$offset = ($page-1)*$results_per_page if $page>1;
my $hits;