linux-kernel - Re: [3.3-rc7] sys_poll use after free (hibernate)

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Message-ID: <20120319081753.GA3333@p183.telecom.by>
Date:	Mon, 19 Mar 2012 11:17:53 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [3.3-rc7] sys_poll use after free (hibernate)

On Sun, Mar 18, 2012 at 07:27:55PM +0000, Al Viro wrote:
> On Sun, Mar 18, 2012 at 12:02:04PM -0700, Linus Torvalds wrote:
> Incidentally, I wonder if we want the whole thing in fs/proc; the argument
> against splitoff to a separate fs used to be "that would break userland
> setups - can't ask people to update /etc/fstab or init scripts to mount
> that thing on /proc/sys".  Fair enough, but... what's to stop us from slapping
> ->d_automount() on /proc/sys like that:
> 	struct vfsmount *mnt = vfs_kern_mount(&sysctlfs_type, 0, "sysctl", 0);
> 	if (!IS_ERR(mnt))
> 		mntget(mnt);
> 	return mnt;
> and we are all set.  IOW, now that ->d_automount() stuff is there, we can
> do that easily without any userland breakage.  Comments?

IIRC, fstab argument was the only one.
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