linux-kernel - Re: [RFC/PATCH] revoke/frevoke system calls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 22 Jul 2006 09:22:37 +0300 (EEST)
From:	Pekka J Enberg <penberg@...Helsinki.FI>
To:	Andrew Morton <akpm@...l.org>
cc:	alan@...rguk.ukuu.org.uk, tytso@....edu,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC/PATCH] revoke/frevoke system calls

On Thu, 20 Jul 2006 15:07:30 +0300 (EEST)
Pekka J Enberg <penberg@...Helsinki.FI> wrote:
> > This patch implements the revoke(2) and frevoke(2) system calls for all
> > types of files.
> >
> > ...
> >
> > -	file = fget_light(fd, &fput_needed);
> > +	file = fget(fd);
 
On Fri, 21 Jul 2006, Andrew Morton wrote:
> This is sad.

There are alternatives, playing games with ->f_op, creating fake struct 
file, and doing IS_REVOKED if-else in the paths, but I think this is by 
far the simplest way to do it. So in the Andrew scale of sads, how 
sad is it, exactly?-)
 
On Thu, 20 Jul 2006 15:07:30 +0300 (EEST)
Pekka J Enberg <penberg@...Helsinki.FI> wrote:
> > +static int revoke_files(struct task_struct *owner, struct inode *inode,
> > +			struct file *exclude, struct list_head *to_close)
> > +{
> > ...
> > +	spin_lock(&files->file_lock);
> > ...
> > +		revoked = kmalloc(sizeof(*revoked), GFP_KERNEL);
 
On Fri, 21 Jul 2006, Andrew Morton wrote:
> This is bad.

Indeed, I'll come up with a better one as soon as I sort out the mmap 
takedown issues.

Thanks Andrew.

					Pekka
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/