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MySQL DoS ?
From: patrick () cookie monster org (Phear Me)
Date: Sat, 15 Aug 1998 03:15:49 +0200
This appeared at the MySQL list: Date: Fri, 14 Aug 1998 18:50:02 +0200 From: Jochen Wiedmann <joe () ispsoft de> Subject: mysql: Connecting/Disconnecting 1100 times freezes server Received: (from root@localhost) by laptop.ispsoft.de (8.8.8/8.8.8) id SAA08052 for mysql () tcx se; Fri, 14 Aug 1998 18:42:55 +0200 Date: Fri, 14 Aug 1998 18:42:55 +0200 Full-Name: root Message-Id: <199808141642.SAA08052 () laptop ispsoft de> From: joe To: mysql () tcx se Subject: connecting/disconnecting 1100 times freezes server
Description:
A simple test script that connects/disconnects in an endless loop makes the MySQL server freeze after approximately 1100 iterations. Is this a bug or a security related feature? If the latter, can I turn it off somehow, as it prevents me from investigating a memory leak in the DBD::mysql's connect method.
How-To-Repeat:
#include <stdlib.h> #include <string.h> #include <stdio.h> #include <mysql/mysql.h> int main(int argc, char* argv[]) { MYSQL sock; int i = 0; while (1) { if (++i % 100 == 0) { printf("%d\n", i); } mysql_init(&sock); if (!mysql_real_connect(&sock, NULL, NULL, NULL, NULL, 0, NULL, 0)) { fprintf(stderr, "Cannot connect: %s\n", mysql_error(&sock)); exit(10); } mysql_close(&sock); } }
Fix:
Not known
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