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
| ||
|
Date: Tue, 28 Feb 2012 16:24:47 +0100 From: Javier Martinez Canillas <javier.martinez@...labora.co.uk> To: David Lamparter <equinox@...c24.net> CC: Rodrigo Moya <rodrigo.moya@...labora.co.uk>, David Miller <davem@...emloft.net>, javier@...labora.co.uk, eric.dumazet@...il.com, lennart@...ttering.net, kay.sievers@...y.org, alban.crequy@...labora.co.uk, bart.cerneels@...labora.co.uk, sjoerd.simons@...labora.co.uk, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/10] af_unix: add multicast and filtering features to AF_UNIX On 02/28/2012 03:28 PM, David Lamparter wrote: > On Tue, Feb 28, 2012 at 11:47:39AM +0100, Rodrigo Moya wrote: >> > - slow readers: dropping packets vs blocking the sender. Although >> > datagrams are not reliable on IP, datagrams on Unix sockets are >> never >> > lost. So if one receiver has its buffer full the sender is blocked >> > instead of dropping packets. That way we guarantee a reliable >> > communication channel. > > This sounds like a terribly nice way to f*ck the entire D-Bus system by > having one broken (or malicious) desktop application. What's the > intended way of coping with users that block the socket by not reading? > > > -David L. The problem is that D-bus expects a reliable transport method (TCP or SOCK_STREAM Unix socks) but this is not the case with multicast Unix sockets. Since our implementation is for SOCK_SEQPACKET and SOCK_DGRAM socket types. So, you have to either add another layer to the D-bus protocol to make it reliable (acks, retransmissions, flow control, etc) or avoid losing D-bus messages (by blocking the sender if one of the receivers has its buffer full). Regards, Javier -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists