From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Dan Carpenter <error27@gmail.com>,
Matthew Wilcox <matthew@wil.cx>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [patch v2] fcntl: return -EFAULT if copy_to_user fails
Date: Thu, 03 Jun 2010 21:16:52 +0900 [thread overview]
Message-ID: <4C079D34.5010500@oss.ntt.co.jp> (raw)
In-Reply-To: <4C07990A.8080508@fusionio.com>
(2010/06/03 20:59), Jens Axboe wrote:
> On 2010-06-03 12:35, Dan Carpenter wrote:
>> copy_to_user() returns the number of bytes remaining, but we want to
>> return -EFAULT.
>> ret = fcntl(fd, F_SETOWN_EX, NULL);
>> With the original code ret would be 8 here.
>>
>> V2: Takuya Yoshikawa pointed out a similar issue in f_getown_ex()
>
> Pretty basic bug, how long has this been there?
IIUC, from the beginning, when these were introduced.
And I recently sent similar bug fixes for other parts.
Ah, I also saw somebody sent cleanup patches using memdup_user() which does
not reside in uaccess.h.
Though I'm personally using private *_user documentation,
are there any good official doc for these?
Takuya
>
> Acked-by: Jens Axboe<jaxboe@fusionio.com>
>
next prev parent reply other threads:[~2010-06-03 12:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 10:04 [patch] " Dan Carpenter
2010-06-03 10:22 ` Takuya Yoshikawa
2010-06-03 10:35 ` [patch v2] " Dan Carpenter
2010-06-03 10:42 ` Peter Zijlstra
2010-06-03 11:59 ` Jens Axboe
2010-06-03 12:16 ` Takuya Yoshikawa [this message]
2010-06-03 12:38 ` Eric Dumazet
2010-06-03 13:10 ` Nick Piggin
2010-06-03 13:24 ` Takuya Yoshikawa
2010-06-03 13:42 ` Eric Dumazet
2010-06-03 12:45 ` Dan Carpenter
2010-06-04 11:14 ` Dan Carpenter
2010-06-03 12:45 ` [patch] " Al Viro
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