linux-kernel - Re: vxfs_readdir locking incorrect: add lock_kernel() or remove unlock

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:	Mon, 24 Jul 2006 17:20:40 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Josh Triplett <josht@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: vxfs_readdir locking incorrect: add lock_kernel() or remove
 unlock_kernel()?

On Mon, 24 Jul 2006 15:42:17 -0700
Josh Triplett <josht@...ibm.com> wrote:

> Commit 7b2fd697427e73c81d5fa659efd91bd07d303b0e in the historical GIT
> tree stopped calling the readdir member of a file_operations struct with
> the big kernel lock held, and fixed up all the readdir functions to do
> their own locking.  However, that change added calls to unlock_kernel()
> in vxfs_readdir (fs/freevxfs/vxfs_lookup.c), but no call to
> lock_kernel().

That would appear to imply that nobody has used freevxfs in four years.

>  Should vxfs_readdir call lock_kernel(), or should the
> calls to unlock_kernel() go away?

I don't see anything in there which needs the locking, apart from perhaps
f_pos updates.  But it's probably best to add the lock_kernel() - this is a
bugfixing exercise, not a remove-BKL-from-freevxfs exercise.
-
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/