This is a note to let you know that I've just added the patch titled
floppy: don't write kernel-only members to FDRAWCMD ioctl output
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
floppy-don-t-write-kernel-only-members-to-fdrawcmd-ioctl-output.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2145e15e0557a01b9195d1c7199a1b92cb9be81f Mon Sep 17 00:00:00 2001
From: Matthew Daley <mattd@xxxxxxxxxxx>
Date: Mon, 28 Apr 2014 19:05:21 +1200
Subject: floppy: don't write kernel-only members to FDRAWCMD ioctl output
From: Matthew Daley <mattd@xxxxxxxxxxx>
commit 2145e15e0557a01b9195d1c7199a1b92cb9be81f upstream.
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@xxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/floppy.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3058,7 +3058,10 @@ static int raw_cmd_copyout(int cmd, void
int ret;
while (ptr) {
- ret = copy_to_user(param, ptr, sizeof(*ptr));
+ struct floppy_raw_cmd cmd = *ptr;
+ cmd.next = NULL;
+ cmd.kernel_data = NULL;
+ ret = copy_to_user(param, &cmd, sizeof(cmd));
if (ret)
return -EFAULT;
param += sizeof(struct floppy_raw_cmd);
Patches currently in stable-queue which might be from mattd@xxxxxxxxxxx are
queue-3.4/floppy-ignore-kernel-only-members-in-fdrawcmd-ioctl-input.patch
queue-3.4/floppy-don-t-write-kernel-only-members-to-fdrawcmd-ioctl-output.patch
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