linux-kernel - Re: [Linaro-mm-sig] Re: [PATCH] epoll: try to be a _bit

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Date: Fri, 10 May 2024 12:55:07 +0200
From: Christian Brauner <brauner@...nel.org>
To: Daniel Vetter <daniel@...ll.ch>
Cc: Christian König <ckoenig.leichtzumerken@...il.com>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, keescook@...omium.org, 
	axboe@...nel.dk, christian.koenig@....com, dri-devel@...ts.freedesktop.org, 
	io-uring@...r.kernel.org, jack@...e.cz, laura@...bott.name, linaro-mm-sig@...ts.linaro.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	minhquangbui99@...il.com, sumit.semwal@...aro.org, 
	syzbot+045b454ab35fd82a35fb@...kaller.appspotmail.com, syzkaller-bugs@...glegroups.com
Subject: Re: [Linaro-mm-sig] Re: [PATCH] epoll: try to be a _bit_ better
 about file lifetimes

> For the uapi issue you describe below my take would be that we should just
> try, and hope that everyone's been dutifully using O_CLOEXEC. But maybe
> I'm biased from the gpu world, where we've been hammering it in that
> "O_CLOEXEC or bust" mantra since well over a decade. Really the only valid

Oh, we're very much on the same page. All new file descriptor types that
I've added over the years are O_CLOEXEC by default. IOW, you need to
remove O_CLOEXEC explicitly (see pidfd as an example). And imho, any new
fd type that's added should just be O_CLOEXEC by default.