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Message-ID: <20170510065448.GD4115@infradead.org>
Date: Tue, 9 May 2017 23:54:48 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Al Viro <viro@...IV.linux.org.uk>
Cc: Christoph Hellwig <hch@...radead.org>,
Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
Greg KH <greg@...ah.com>, Thomas Garnier <thgarnie@...gle.com>,
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David Howells <dhowells@...hat.com>,
René Nyffenegger <mail@...enyffenegger.ch>,
Andrew Morton <akpm@...ux-foundation.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
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Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Re: [PATCH v9 1/4] syscalls: Verify address
limit before returning to user-mode
On Wed, May 10, 2017 at 04:39:12AM +0100, Al Viro wrote:
> fcntl stuff: I've decided not to put something similar into work.compat
> since I couldn't decide what to do with compat stuff - word-by-word copy
> from userland converting to struct flock + conversion to posix_lock +
> actual work + conversion to flock + word-by-word copy to userland... Smells
> like we might be better off with compat_flock_to_posix_lock() et.al.
> I'm still not sure; played a bit one way and another and dediced to drop
> it for now. Hell knows...
My version already is an improvement in lines of code alone. Between
that and stopping to mess with the address limit I think it's a clear
winner. But it's pretty independent of the rest, and I'll just run
it through Jeff and Bruce and ask them what they think.
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