Message-ID: <55805D0B.6020309@zytor.com>
Date: Tue, 16 Jun 2015 10:29:47 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Alex Henrie <alexhenrie24@gmail.com>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        Kees Cook <keescook@chromium.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Tyler Hicks <tyhicks@canonical.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arjan van de Ven <arjan@infradead.org>,
        Denys Vlasenko <dvlasenk@redhat.com>, Brian Gerst <brgerst@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Austin Hemmelgarn <ahferroin7@gmail.com>,
        Arjan van de Ven <arjanvandeven@gmail.com>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: ioperm is kept on fork
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On 06/16/2015 09:42 AM, Alex Henrie wrote:
> Hi,
> 
> Could one of you knowledgeable kernel developers comment on
> https://bugzilla.kernel.org/show_bug.cgi?id=99911 ? The man pages
> maintainer wants to know when this behavior changed.
> 

I know that I wrote a program which required I/O privileges at some
point, and it called ioperm() in a setuid wrapper.  This was in the late
90s.  I suspect we'd have to do a bit of a deep dive to double-check;
the old ioperm() code which only supported the ISA port range to avoid
having to copy the bitmap might be good to look at.

	-hpa


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