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Date:      Tue, 18 Jun 2019 10:48:13 -0400
From:      Lowell Gilbert <>
To:        mike tancsa <>
Cc:        "freebsd-security\" <>
Subject:   Re: TCP SACK (CVE-2019-5599)
Message-ID:  <>
In-Reply-To: <> (mike tancsa's message of "Tue, 18 Jun 2019 10:33:00 -0400")
References:  <>

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mike tancsa <> writes:

> *How does I know if this is enabled in my default kernel on RELENG_12 ?
> There is some vague mention in various forums this is not the default on
> FreeBSD ? Can anyone shed more light as to how this does/does not impact
> FreeBSD ?

If the net.inet.tcp.functions_default sysctl doesn't list "rack", you
don't have to worry about it. As far as I can see from a quick look at
my source tree, you would have to load a module to use it.

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