linux-kernel - Re: Rsync cannot copy to a vfat partition on kernel 2.6.25

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Message-ID: <20080601220956.GA2249@elf.ucw.cz>
Date:	Mon, 2 Jun 2008 00:09:56 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Rsync cannot copy to a vfat partition on kernel 2.6.25

On Mon 2008-06-02 06:12:23, OGAWA Hirofumi wrote:
> Pavel Machek <pavel@....cz> writes:
> 
> > Hi!
> 
> Hi,
> 
> >> > We had a user report at https://bugzilla.redhat.com/show_bug.cgi?id=449080
> >> > that in 2.6.25, he can no longer rsync to a vfat partition, even as root.
> >> > I just reproduced this here. It gets -EPERM in the mkstemp call.
> >> > (full strace in the bug report).
> >> >
> >> > Did we change behaviour somehow in the vfat code?
> >> > 2.6.24.7 works fine apparently.
> >> 
> >> Yes, it was changed. New one allows only acceptable chmod(), and if not
> >> acceptable, it returns -EPERM. Old one allows even if it can't store the
> >> disk inode. But it may be too strict for users.
> >
> > Hmm... but I guess mkstemp is no longer safe with this?
> >
> > So we have choice between security hole and regression...?
> 
> Maybe. But if users choose the group or world writable umask, I guess
> nobody would care the permission of temporary file, because all file is
> writable always. Um..

Okay, if the user wants his vfat world-readable, it is hard to create
security hole there.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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