linux-kernel - [ 142/143] floppy: ignore kernel-only members in FDRAWCMD ioctl input

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Date:	Mon, 12 May 2014 02:34:22 +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: [ 142/143] floppy: ignore kernel-only members in FDRAWCMD ioctl input

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

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

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

Always clear out these floppy_raw_cmd struct members after copying the
entire structure from userspace so that the in-kernel version is always
valid and never left in an interdeterminate state.

Signed-off-by: Matthew Daley <mattd@...fuzz.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
(cherry picked from commit ef87dbe7614341c2e7bfe8d32fcb7028cc97442c)
[wt: be careful in 2.6.32 we still have the ugly macros everywhere]
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/block/floppy.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 5c01f74..19d45e6 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3209,9 +3209,12 @@ static inline int raw_cmd_copyin(int cmd, char __user *param,
 		if (!ptr)
 			return -ENOMEM;
 		*rcmd = ptr;
-		COPYIN(*ptr);
+		ret = copy_from_user(ptr, (void __user *)param, sizeof(*ptr));
 		ptr->next = NULL;
 		ptr->buffer_length = 0;
+		ptr->kernel_data = NULL;
+		if (ret)
+			return -EFAULT;
 		param += sizeof(struct floppy_raw_cmd);
 		if (ptr->cmd_count > 33)
 			/* the command may now also take up the space
-- 
1.7.12.2.21.g234cd45.dirty



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