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Date: Mon, 07 Oct 2013 15:55:02 -0700 From: Andi Kleen <andi@...stfloor.org> To: David Miller <davem@...emloft.net> Cc: sar@...-labs.com, luto@...capital.net, netdev@...r.kernel.org, mtk.manpages@...il.com, ebiederm@...ssion.com Subject: Re: bug in passing file descriptors David Miller <davem@...emloft.net> writes: > From: Steve Rago <sar@...-labs.com> > Date: Mon, 7 Oct 2013 16:29:15 -0400 > >> On 10/07/2013 03:42 PM, David Miller wrote: >>> There is no compatability issue. >>> >>> 32-bit tasks will always see the 4-byte align/length. >>> 64-bit tasks will always see the 8-byte align/length. >>> >> >> Really? So when I compile my application on a 32-bit Linux box and >> then try to run it on a 64-bit Linux box, you're not going to overrun >> my buffer when CMSG_SPACE led me to allocate an insufficient amount of >> memory needed to account for padding on the 64-bit platform? > > We have a compatability layer that gives 32-bit applications the > same behavior as if they had run on a 32-bit machine. > > Search around for the MSG_MSG_COMPAT flag and how that is used in > net/socket.c But it seems the compat layer doesn't handle this correctly, otherwise Steve's original test case would work. Must be a bug somewhere in the compat layer. -Andi -- ak@...ux.intel.com -- Speaking for myself only -- 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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