linux-kernel - [2.6.22-rc4] UDP's local port assignment not working correctly.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <200706072040.BEC00116.MQFFtSOVOHFOLJ@I-love.SAKURA.ne.jp>
Date:	Thu, 7 Jun 2007 20:40:39 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	linux-kernel@...r.kernel.org
Subject: [2.6.22-rc4] UDP's local port assignment not working correctly.

Hello.

Same local ports are assigned to multiple sockets.
The following program should print different local port number.

----- Start of program -----
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>

int main(int argc, char *argv[]) {
	struct sockaddr_in addr;
	socklen_t size = sizeof(addr);
	int server = socket(PF_INET, SOCK_DGRAM, 0), client = socket(PF_INET, SOCK_DGRAM, 0);
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	addr.sin_port = htons(0);

	printf("Server: Binding UDP 127.0.0.1 0 ... ");
	bind(server, (struct sockaddr *) &addr, sizeof(addr));
	getsockname(server, (struct sockaddr *) &addr, &size);
	printf("bound to port %d\n", ntohs(addr.sin_port));

	printf("Client: Connecting UDP 127.0.0.1 %d ... ", ntohs(addr.sin_port));
	connect(client, (struct sockaddr *) &addr, sizeof(addr));
	getsockname(client, (struct sockaddr *) &addr, &size);
	printf("bound to port %d\n", ntohs(addr.sin_port));

	return 0;
}
----- End of program -----

I told YOSHIFUJI Hideaki and he answered me that
this is a regression caused by changing UDP's hash search algorithm to 2-pass.

Thanks.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/