From: David Miller <davem@davemloft.net>
To: dborkman@redhat.com
Cc: ast@plumgrid.com, netdev@vger.kernel.org, hagen@jauu.net,
keescook@chromium.org, pmoore@redhat.com, mingo@kernel.org,
hpa@linux.intel.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2 8/9] net: filter: rework/optimize internal BPF interpreter's instruction set
Date: Tue, 25 Mar 2014 20:17:12 -0400 (EDT) [thread overview]
Message-ID: <20140325.201712.1651156258234145348.davem@davemloft.net> (raw)
In-Reply-To: <1395749457-16178-9-git-send-email-dborkman@redhat.com>
From: Daniel Borkmann <dborkman@redhat.com>
Date: Tue, 25 Mar 2014 13:10:56 +0100
> - Conditional jt/jf targets replaced with jt/fall-through,
> and forward/backward jumps now possible as well
Ummm... does anyone even remember why backwards jumps were not allowed
in the original BPF?
It's to guarentee forward progress in the filter.
Allowing branching backward would allow endless loops.
Please remove this feature.
next prev parent reply other threads:[~2014-03-26 0:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1395749457-16178-1-git-send-email-dborkman@redhat.com>
2014-03-25 12:10 ` Daniel Borkmann
2014-03-26 0:17 ` David Miller [this message]
2014-03-26 0:24 ` H. Peter Anvin
2014-03-26 0:46 ` David Miller
2014-03-26 1:58 ` Alexei Starovoitov
2014-03-26 16:22 ` David Miller
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