linux-kernel - Re: [PATCH 2/2] nfsd: only set file_lock.fl_lmops in nfsd4

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: <20090127223325.GK9151@fieldses.org>
Date:	Tue, 27 Jan 2009 17:33:25 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, cluster-devel@...hat.com,
	teigland@...hat.com
Subject: Re: [PATCH 2/2] nfsd: only set file_lock.fl_lmops in nfsd4_lockt
	if a stateowner is found

On Thu, Jan 22, 2009 at 02:16:04PM -0500, Jeff Layton wrote:
> nfsd4_lockt does a search for a lockstateowner when building the lock
> struct to test. If one is found, it'll set fl_owner to it. Regardless of
> whether that happens, it'll also set fl_lmops. Given that this lock is
> basically a "lightweight" lock that's just used for checking conflicts,
> setting fl_lmops is probably not appropriate for it.
> 
> This behavior exposed a bug in DLM's GETLK implementation where it
> wasn't clearing out the fields in the file_lock before filling in
> conflicting lock info. While we were able to fix this in DLM, it
> still seems pointless and dangerous to set the fl_lmops this way
> when we may have a NULL lockstateowner.
> 
> Signed-off-by: Jeff Layton <jlayton@...hat.com>

Thanks, applied.--b.

> ---
>  fs/nfsd/nfs4state.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 88db7d3..b6f60f4 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -2871,7 +2871,6 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
>  		file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
>  	file_lock.fl_pid = current->tgid;
>  	file_lock.fl_flags = FL_POSIX;
> -	file_lock.fl_lmops = &nfsd_posix_mng_ops;
>  
>  	file_lock.fl_start = lockt->lt_offset;
>  	file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
> -- 
> 1.5.5.6
> 
--
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/