linux-kernel - Re: [PATCH 1/4] module: add syscall to load module from fd

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Message-ID: <CAHO5Pa2fysDRS3sFSy785XBKApxydN0ONW5kAfVJNkrB+wOaBw@mail.gmail.com>
Date:	Tue, 9 Oct 2012 23:54:55 +0200
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Arnd Bergmann <arnd@...db.de>,
	James Morris <james.l.morris@...cle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Paris <eparis@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-security-module@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 1/4] module: add syscall to load module from fd

Kees,

> +SYSCALL_DEFINE2(finit_module, int, fd, const char __user *, uargs)

Given the repeated experience of the last few years--new system calls
that are in essence revisions of older system calls with a 'flags'
argument bolted on to allow more flexible behavior (e.g., accept4(),
dup3(), utimensat(), epoll_create1(), pipe2(), inotify_init(1), and so
on.)--maybe it is worth considering adding a 'flags' bit mask
argument[1] to the finti_module() system call now, to allow for
possible future extensions to the behavior of the interface. What do
you think?

Thanks,

Michael

[1] Yes, I know that init_module() doesn't have a flags argument, but
that interface was added when we'd seen fewer of the kinds of cases
listed above.
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