linux-kernel - [PATCH 4.9 10/31] orangefs: fix buffer size mis-match between kernel space and user space.

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Message-Id: <20170416080222.320981387@linuxfoundation.org>
Date:   Sun, 16 Apr 2017 10:04:01 +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, Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>
Subject: [PATCH 4.9 10/31] orangefs: fix buffer size mis-match between kernel space and user space.

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

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

From: Mike Marshall <hubcap@...ibond.com>

commit eb68d0324dc4d88ab0d6159bdcd98c247a3a8954 upstream.

The deamon through which the kernel module communicates with the userspace
part of Orangefs, the "client-core", sends initialization data to the
kernel module with ioctl. The initialization data was built by the
client-core in a 2k buffer and copy_from_user'd into a 1k buffer
in the kernel module. When more than 1k of initialization data needed
to be sent, some was lost, reducing the usability of the control by which
debug levels are set. This patch sets the kernel side buffer to 2K to
match the userspace side...

Signed-off-by: Mike Marshall <hubcap@...ibond.com>
Signed-off-by: Martin Brandenburg <martin@...ibond.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/orangefs/orangefs-dev-proto.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/orangefs/orangefs-dev-proto.h
+++ b/fs/orangefs/orangefs-dev-proto.h
@@ -50,8 +50,7 @@
  * Misc constants. Please retain them as multiples of 8!
  * Otherwise 32-64 bit interactions will be messed up :)
  */
-#define ORANGEFS_MAX_DEBUG_STRING_LEN	0x00000400
-#define ORANGEFS_MAX_DEBUG_ARRAY_LEN	0x00000800
+#define ORANGEFS_MAX_DEBUG_STRING_LEN	0x00000800

 /*
  * The maximum number of directory entries in a single request is 96.