linux-ext4 - Re: [PATCH 1/1] jbd2: fix incorrect unlock on j_list

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] [day] [month] [year] [list]

Date:   Wed, 12 Oct 2016 23:21:13 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Taesoo Kim <tsgatesv@...il.com>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, taesoo@...ech.edu,
        changwoo@...ech.edu, sanidhya@...ech.edu, blee@...ech.edu,
        csong84@...ech.edu, stable@...r.kernel.org,
        "Faccini, Bruno" <bruno.faccini@...el.com>
Subject: Re: [PATCH 1/1] jbd2: fix incorrect unlock on j_list_lock

On Wed, Oct 12, 2016 at 04:58:35PM -0600, Andreas Dilger wrote:
> On Mar 17, 2015, at 8:08 PM, Taesoo Kim <tsgatesv@...il.com> wrote:
> > 
> > When 'jh->b_transaction == transaction' (asserted by below)
> > 
> >         J_ASSERT_JH(jh, (jh->b_transaction == transaction || ...
> > 
> > 'journal->j_list_lock' will be incorrectly unlocked, since
> > spin_lock() is called only in the 'if' and 'else-if' blocks but
> > not in the missing 'else' case, which results in a hang or an oops....
> > 
> > Signed-off-by: Taesoo Kim <tsgatesv@...il.com>
> 
> We've hit this repeatedly on kernels with commit v3.14-rc2-30-g6e4862a
> "jbd2: minimize region locked by j_list_lock in journal_get_create_access"
> under heavy load and this patch has fixed the problem.
> 
> It should also be considered for stable kernels after 3.14.
> 
> [I've updated the above commit message slightly to give more details.]
> 
> Reviewed-by: Andreas Dilger <adilger@...ger.ca>

Thanks, applied.

Apologies, this got lost which is why I hadn't handled it earlier.

	   	    	       	      - Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html