linux-kernel - [PATCH 3.19 161/177] nfsd4: disallow ALLOCATE with special stateids

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: <20150502190127.322396265@linuxfoundation.org>
Date:	Sat,  2 May 2015 21:03:03 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Anna Schumaker <Anna.Schumaker@...app.com>,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 3.19 161/177] nfsd4: disallow ALLOCATE with special stateids

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "J. Bruce Fields" <bfields@...hat.com>

commit 5ba4a25ab7b13be528b23f85182f4d09cf7f71ad upstream.

vfs_fallocate will hit a NULL dereference if the client tries an
ALLOCATE or DEALLOCATE with a special stateid.  Fix that.  (We also
depend on the open to have broken any conflicting leases or delegations
for us.)

(If it turns out we need to allow special stateid's then we could do a
temporary open here in the special-stateid case, as we do for read and
write.  For now I'm assuming it's not necessary.)

Fixes: 95d871f03cae "nfsd: Add ALLOCATE support"
Cc: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfsd/nfs4proc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1028,6 +1028,8 @@ nfsd4_fallocate(struct svc_rqst *rqstp,
 		dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
 		return status;
 	}
+	if (!file)
+		return nfserr_bad_stateid;

 	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
 				     fallocate->falloc_offset,

--
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/