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Date: Fri, 24 Apr 2009 04:40:12 -0700 (PDT) From: David Miller <davem@...emloft.net> To: penguin-kernel@...ove.sakura.ne.jp Cc: paul.moore@...com, linux-security-module@...r.kernel.org, netdev@...r.kernel.org, greg@...kko.com Subject: Re: [PATCH] LSM: Add security_socket_post_accept() and security_socket_post_recv_datagram(). From: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> Date: Fri, 24 Apr 2009 14:26:24 +0900 > OK. I understood that security_socket_post_recv_datagram() must not return > -EAGAIN if a process calls recvmsg() after poll() said "ready". > That will be also true for security_socket_recvmsg(). > > > Is it OK for security_socket_recvmsg()/security_socket_accept() to return > an error other than -EAGAIN? > (In other words, security_socket_recvmsg()/security_socket_accept() errors are > one of "hard" errors?) I think you really need to wrap your head around the fact that you can't decide after you've accepted a packet, that it's no longer acceptable. Once it's in the socket's queue, and you tell the application it's there at poll() time, you simply cannot reneg. You just can't. Otherwise you're breaking the whole premise upon which these UNIX system calls are based. This is how people use these things. Are you beginning to understand the fundamental problems I have with your work? -- 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
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