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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Thu, 23 Jan 2014 15:20:58 +0100
From:	Hannes Frederic Sowa <>
To:	Julian Anastasov <>
Cc:	David Miller <>,,
Subject: Re: Linux kernel patch: elide fib_validate_source() completely when possible - bad side effect?

Hi Julian,

On Thu, Jan 23, 2014 at 11:47:33AM +0200, Julian Anastasov wrote:
> On Thu, 23 Jan 2014, Hannes Frederic Sowa wrote:
> > E.g. we register all local registered broadcast addresses in a structure
> > like inet_addr_lst so we only need to check if the packet would leave
> > this host with a broadcast hardware address. If the packet is forwarded
> > the router must do the same check as only it knows the local broadcast
> > addresses. I hope this is correct. ;)
> 	Now when we can override the local table with ip
> rules or to prepend route in local table, we can not be
> sure that the broadcast routes are returned in all cases,
> users can add unicast routes for such addresses.
> 	I don't remember for useful case where one may need to
> override broadcast routes but adding such exceptions looks
> risky.

The check I envisioned would only actually block the ifa_broadcast of only the
incoming interface as source address. So we wouldn't depend on the view of the
routing tables at all.

But I have no strong opinion on that.



To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists