netdev - Re: [PATCH 0/6] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141123194326.GB8517@thin>
Date:	Sun, 23 Nov 2014 11:43:26 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	David Miller <davem@...emloft.net>
Cc:	pieter@...sman.nl, alexander.h.duyck@...el.com,
	viro@...iv.linux.org.uk, ast@...mgrid.com,
	akpm@...ux-foundation.org, beber@...eeweb.net,
	catalina.mocanu@...il.com, dborkman@...hat.com,
	edumazet@...gle.com, ebiederm@...ssion.com, fabf@...net.be,
	fuse-devel@...ts.sourceforge.net, geert@...ux-m68k.org,
	hughd@...gle.com, iulia.manda21@...il.com, JBeulich@...e.com,
	bfields@...ldses.org, jlayton@...chiereds.net,
	linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, mcgrof@...e.com, mattst88@...il.com,
	mgorman@...e.de, mst@...hat.com, miklos@...redi.hu,
	netdev@...r.kernel.org, oleg@...hat.com, Paul.Durrant@...rix.com,
	paulmck@...ux.vnet.ibm.com, pefoley2@...oley.com, tgraf@...g.ch,
	therbert@...gle.com, willemb@...gle.com,
	xiaoguangrong@...ux.vnet.ibm.com, zhenglong.cai@...c.com.cn
Subject: Re: [PATCH 0/6] kernel tinification: optionally compile out splice
 family of syscalls (splice, vmsplice, tee and sendfile)

On Sun, Nov 23, 2014 at 01:46:23PM -0500, David Miller wrote:
> Truly removing sendfile/sendpage means that you can't even compile NFS
> into the tree.

If you mean the in-kernel nfsd (CONFIG_NFSD), that already has a large
stack of "select" and "depends on", both directly and indirectly; adding
a "select SPLICE_SYSCALL" to it seems fine.  (That select does need
adding, though.  Pieter, you need to test-compile more than just
tinyconfig and defconfig.  Try an allyesconfig with *just* splice turned
off, and make sure that compiles.)

Given the requirements of running a file server in the kernel, I'd
expect CONFIG_NFSD to end up with several more selects of optional
functionality in the future.  It seems rather likely that the average
embedded system will be compiling out NFS. :)

Also, this patch series compiles out splice and sendfile, including
several *users* of sendpage; it doesn't compile out the sendpage
support/infrastructure itself.

- Josh Triplett
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html