linux-kernel - [ 143/143] floppy: dont write kernel-only members to FDRAWCMD ioctl output

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Date:	Mon, 12 May 2014 02:34:23 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Matthew Daley <mattd@...fuzz.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 143/143] floppy: dont write kernel-only members to FDRAWCMD ioctl output

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Matthew Daley <mattd@...fuzz.com>

Do not leak kernel-only floppy_raw_cmd structure members to userspace.
This includes the linked-list pointer and the pointer to the allocated
DMA space.

Signed-off-by: Matthew Daley <mattd@...fuzz.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
(cherry picked from commit 2145e15e0557a01b9195d1c7199a1b92cb9be81f)
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/block/floppy.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 19d45e6..f959aad 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3162,7 +3162,12 @@ static inline int raw_cmd_copyout(int cmd, char __user *param,
 	int ret;
 
 	while (ptr) {
-		COPYOUT(*ptr);
+		struct floppy_raw_cmd cmd = *ptr;
+		cmd.next = NULL;
+		cmd.kernel_data = NULL;
+		ret = copy_to_user((void __user *)param, &cmd, sizeof(cmd));
+		if (ret)
+			return -EFAULT;
 		param += sizeof(struct floppy_raw_cmd);
 		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
 			if (ptr->length >= 0
-- 
1.7.12.2.21.g234cd45.dirty



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