linux-kernel - Re: ioperm is kept on fork

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Message-ID: <55805D0B.6020309@zytor.com>
Date:	Tue, 16 Jun 2015 10:29:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alex Henrie <alexhenrie24@...il.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Tyler Hicks <tyhicks@...onical.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andy Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Austin Hemmelgarn <ahferroin7@...il.com>,
	Arjan van de Ven <arjanvandeven@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: ioperm is kept on fork

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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