This is a note to let you know that I've just added the patch titled
Fix pktcdvd ioctl dev_minor range check
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
fix-pktcdvd-ioctl-dev_minor-range-check.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From 252a52aa4fa22a668f019e55b3aac3ff71ec1c29 Mon Sep 17 00:00:00 2001
From: Dan Rosenberg <[email protected]>
Date: Mon, 27 Sep 2010 12:30:28 -0400
Subject: Fix pktcdvd ioctl dev_minor range check
From: Dan Rosenberg <[email protected]>
commit 252a52aa4fa22a668f019e55b3aac3ff71ec1c29 upstream.
The PKT_CTRL_CMD_STATUS device ioctl retrieves a pointer to a
pktcdvd_device from the global pkt_devs array. The index into this
array is provided directly by the user and is a signed integer, so the
comparison to ensure that it falls within the bounds of this array will
fail when provided with a negative index.
This can be used to read arbitrary kernel memory or cause a crash due to
an invalid pointer dereference. This can be exploited by users with
permission to open /dev/pktcdvd/control (on many distributions, this is
readable by group "cdrom").
Signed-off-by: Dan Rosenberg <[email protected]>
[ Rather than add a cast, just make the function take the right type -Linus ]
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/block/pktcdvd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2408,7 +2408,7 @@ static void pkt_release_dev(struct pktcd
pkt_shrink_pktlist(pd);
}
-static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
+static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
{
if (dev_minor >= MAX_WRITERS)
return NULL;
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
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