linux-kernel - Re: [PATCH v3] tty: tty_io: remove hung_up_tty

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Message-ID: <CAHk-=whTakjVGgBC5OtoZ5Foo=hd4-g+NZ79nkMDVj6Ug7ARKQ@mail.gmail.com>
Date: Wed, 1 May 2024 14:06:29 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Marco Elver <elver@...gle.com>
Cc: paulmck@...nel.org, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Dmitry Vyukov <dvyukov@...gle.com>, 
	syzbot <syzbot+b7c3ba8cdc2f6cf83c21@...kaller.appspotmail.com>, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	Nathan Chancellor <nathan@...nel.org>, Arnd Bergmann <arnd@...nel.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v3] tty: tty_io: remove hung_up_tty_fops

On Wed, 1 May 2024 at 13:15, Marco Elver <elver@...gle.com> wrote:
>
> This is relatively trivial:
>
> #ifdef __SANITIZE_THREAD__
> #define __data_racy volatile
> #endif

I really wouldn't want to make a code generation difference, but I
guess when the sanitizer is on, the compiler generating crap code
isn't a huge deal.

> In some cases it might cause the compiler to complain if converting a
> volatile pointer to a non-volatile pointer

No. Note that it's not the *pointer* that is volatile, it's the
structure member.

So it would be something like

        const struct file_operations    * __data_racy f_op;

and only the load of f_op would be volatile - not the pointer itself.

Of course, if somebody then does "&file->f_op" to get a pointer to a
pointer, *that* would now be a volatile pointer, but I don't see
people doing that.

So I guess this might be a way forward. Anybody want to verify?

Now, the "hung_up_tty_fops" *do* need to be expanded to have hung up
ops for every op that is non-NULL in the normal tty ops. That was a
real bug. We'd also want to add a big comment to the tty fops to make
sure anybody who adds a new tty f_op member to make sure to populate
the hung up version too.

                Linus