Re: [PATCH] fanotify: fix -EOVERFLOW with large files on 64-bit

[Greg KH <greg@kroah.com>]

On Thu, Nov 16, 2017 at 08:43:53PM +0100, Stefan Nuernberger wrote:
> From: Will Woods <wwoods@redhat.com>
> 
> commit 1e2ee49f7f1b79f0b14884fe6a602f0411b39552 upstream.
> 
> On 64-bit systems, O_LARGEFILE is automatically added to flags inside
> the open() syscall (also openat(), blkdev_open(), etc).  Userspace
> therefore defines O_LARGEFILE to be 0 - you can use it, but it's a
> no-op.  Everything should be O_LARGEFILE by default.
> 
> But: when fanotify does create_fd() it uses dentry_open(), which skips
> all that.  And userspace can't set O_LARGEFILE in fanotify_init()
> because it's defined to 0.  So if fanotify gets an event regarding a
> large file, the read() will just fail with -EOVERFLOW.
> 
> This patch adds O_LARGEFILE to fanotify_init()'s event_f_flags on 64-bit
> systems, using the same test as open()/openat()/etc.
> 
> Addresses https://bugzilla.redhat.com/show_bug.cgi?id=696821
> 
> Signed-off-by: Will Woods <wwoods@redhat.com>
> Acked-by: Eric Paris <eparis@redhat.com>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
> 
> [snu: Backported to 3.2 / 3.10: adjusted context]
> 
> Signed-off-by: Stefan Nuernberger <snu@amazon.com>
> Reviewed-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
> Reviewed-by: Simon Veith <sveith@amazon.de>
> 
> Cc: <stable@vger.kernel.org> # 3.2.x and 3.10.x

3.10.y is end-of-life :(

See the front page of www.kernel.org for that list if you are curious.

thanks,

greg k-h