linux-kernel - Re: [PATCH] splice : Must fully check for fifos

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]

Message-ID: <20061102190700.GQ13555@kernel.dk>
Date:	Thu, 2 Nov 2006 20:07:01 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...l.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>, tytso@....edu
Subject: Re: [PATCH] splice : Must fully check for fifos

On Thu, Nov 02 2006, Eric Dumazet wrote:
> With the patch this time :( Sorry guys
> 
> Hi Andrew
> 
> I think this patch is necessary. It's quite easy to crash a 2.6.19-rc4 box :(
> 
> AFAIK the problem come from inode-diet (by Theodore Ts'o, (2006/Sep/27))
> 
> Thank you
> 
> [PATCH] splice : Must fully check for FIFO
> 
> It appears that i_pipe, i_cdev and i_bdev share the same memory location 
> (anonymous union in struct inode) since commits 
> 577c4eb09d1034d0739e3135fd2cff50588024be
> eaf796e7ef6014f208c409b2b14fddcfaafe7e3a
> 
> Because of that, testing i_pipe being NULL is not anymore sufficient
> to tell if an inode is a FIFO or not.
> 
> Therefore, we must use the S_ISFIFO(inode->i_mode) test before
> assuming i_pipe pointer is pointing to a struct pipe_inode_info.

Indeed, the inode slimming introduced this bug. I'll queue up a test run
of things and send it upstream, thanks for catching this.

-- 
Jens Axboe

-
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/