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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Kirill Smelkov <kirr@nexedi.com>
Cc: Eric Dumazet <edumazet@google.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Alan Stern <stern@rowland.harvard.edu>,
	Marco Elver <elver@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	syzbot <syzbot+3ef049d50587836c0606@syzkaller.appspotmail.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	Andrea Parri <parri.andrea@gmail.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>
Subject: Re: KCSAN: data-race in __alloc_file / __alloc_file
Date: Sun, 17 Nov 2019 11:20:48 -0800
Message-ID: <CAHk-=whdm7qeqydbnC_EGDaiWcG-F-oe09o8T3ChORLnRZFE=w@mail.gmail.com> (raw)
In-Reply-To: <20191117185623.GA22280@deco.navytux.spb.ru>

[-- Attachment #1: Type: text/plain, Size: 429 bytes --]

On Sun, Nov 17, 2019 at 10:56 AM Kirill Smelkov <kirr@nexedi.com> wrote:
>
>   I'd like to take a time break for now.
>   I will try to return to this topic after finishing my main work first.
>   I apologize for the inconvenience. )

Sure, no problem, appreciate that you're looking at it.

I *think* the pipe and socket case should be fixed by something like
this, but it is entirely and utterly untested.

              Linus

[-- Attachment #2: patch.diff --]
[-- Type: text/x-patch, Size: 1349 bytes --]

 fs/pipe.c    | 6 ++++--
 net/socket.c | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 8a2ab2f974bd..de6dee559d41 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -783,6 +783,7 @@ int create_pipe_files(struct file **res, int flags)
 	}
 
 	f->private_data = inode->i_pipe;
+	stream_open(inode, f);
 
 	res[0] = alloc_file_clone(f, O_RDONLY | (flags & O_NONBLOCK),
 				  &pipefifo_fops);
@@ -791,6 +792,7 @@ int create_pipe_files(struct file **res, int flags)
 		fput(f);
 		return PTR_ERR(res[0]);
 	}
+	stream_open(inode, f);
 	res[0]->private_data = inode->i_pipe;
 	res[1] = f;
 	return 0;
@@ -931,9 +933,9 @@ static int fifo_open(struct inode *inode, struct file *filp)
 	__pipe_lock(pipe);
 
 	/* We can only do regular read/write on fifos */
-	filp->f_mode &= (FMODE_READ | FMODE_WRITE);
+	stream_open(inode, filp);
 
-	switch (filp->f_mode) {
+	switch (filp->f_mode & (FMODE_READ | FMODE_WRITE)) {
 	case FMODE_READ:
 	/*
 	 *  O_RDONLY
diff --git a/net/socket.c b/net/socket.c
index 6a9ab7a8b1d2..3c6d60eadf7a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -404,6 +404,7 @@ struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
 
 	sock->file = file;
 	file->private_data = sock;
+	stream_open(SOCK_INODE(sock), file);
 	return file;
 }
 EXPORT_SYMBOL(sock_alloc_file);

  reply index

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAHk-=wjB61GNmqpX0BLA5tpL4tsjWV7akaTc2Roth7uGgax+mw@mail.gmail.com>
2019-11-10 16:09 ` Alan Stern
2019-11-10 19:10   ` Marco Elver
2019-11-11 15:51     ` Alan Stern
2019-11-11 16:51       ` Linus Torvalds
2019-11-11 17:52         ` Eric Dumazet
2019-11-11 18:04           ` Linus Torvalds
2019-11-11 18:31             ` Eric Dumazet
2019-11-11 18:44               ` Eric Dumazet
2019-11-11 19:00                 ` Linus Torvalds
2019-11-11 19:13                   ` Eric Dumazet
2019-11-11 20:43                     ` Linus Torvalds
2019-11-11 20:46                       ` Linus Torvalds
2019-11-11 21:53                         ` Eric Dumazet
2019-11-11 23:51                   ` Linus Torvalds
2019-11-12 16:50                     ` Kirill Smelkov
2019-11-12 17:23                       ` Linus Torvalds
2019-11-12 17:36                         ` Linus Torvalds
2019-11-17 18:56                           ` Kirill Smelkov
2019-11-17 19:20                             ` Linus Torvalds [this message]
2019-11-11 18:50               ` Linus Torvalds
2019-11-11 18:59                 ` Marco Elver
2019-11-11 18:59                 ` Eric Dumazet
2019-11-10 19:12   ` Linus Torvalds
2019-11-10 19:20     ` Linus Torvalds
2019-11-10 20:44       ` Paul E. McKenney
2019-11-10 21:10         ` Linus Torvalds
2019-11-10 21:31           ` Paul E. McKenney
2019-11-11 14:17         ` Marco Elver
2019-11-11 14:31           ` Paul E. McKenney
2019-11-11 15:10             ` Marco Elver
2019-11-13  0:25               ` Paul E. McKenney
2019-11-12 19:14     ` Alan Stern
2019-11-12 19:47       ` Linus Torvalds
2019-11-12 20:29         ` Alan Stern
2019-11-12 20:58           ` Linus Torvalds
2019-11-12 21:13             ` Linus Torvalds
2019-11-12 22:05               ` Marco Elver
2019-11-12 21:48             ` Alan Stern
2019-11-12 22:07               ` Eric Dumazet
2019-11-12 22:44                 ` Alexei Starovoitov
2019-11-12 23:17                   ` Eric Dumazet
2019-11-12 23:40                     ` Linus Torvalds
2019-11-13 15:00                       ` Marco Elver
2019-11-13 16:57                         ` Linus Torvalds
2019-11-13 21:33                           ` Marco Elver
2019-11-13 21:50                             ` Alan Stern
2019-11-13 22:48                               ` Marco Elver
2019-11-08 13:16 syzbot
2019-11-08 13:28 ` Eric Dumazet
2019-11-08 17:01   ` Linus Torvalds
2019-11-08 17:22     ` Eric Dumazet
2019-11-08 17:38       ` Linus Torvalds
2019-11-08 17:53         ` Eric Dumazet
2019-11-08 17:55           ` Eric Dumazet
2019-11-08 18:02             ` Eric Dumazet
2019-11-08 18:12               ` Linus Torvalds
2019-11-08 20:30             ` Linus Torvalds
2019-11-08 20:53               ` Eric Dumazet
2019-11-08 21:36                 ` Linus Torvalds
2019-11-08 18:05           ` Linus Torvalds
2019-11-08 18:15             ` Marco Elver
2019-11-08 18:40               ` Linus Torvalds
2019-11-08 19:48                 ` Marco Elver
2019-11-08 20:26                   ` Linus Torvalds
2019-11-08 21:57                     ` Alan Stern
2019-11-08 22:06                       ` Linus Torvalds
2019-11-09 23:08                         ` Alan Stern

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