[PATCH] Fix buffer overflow in Omnikey CardMan 4040 driver (CVE-2007-0005)

Based on a patch from Don Howard <dhoward@redhat.com>

When calling write() with a buffer larger than 512 bytes, the
driver's write buffer overflows, allowing to overwrite the EIP and
execute arbitrary code with kernel privileges.

In read(), there exists a similar problem, but coming from the device.
A malicous or buggy device sending more than 512 bytes can overflow
of the driver's read buffer, with the same effects as above.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index 0e82968c2f38..f2e4ec4fd407 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -273,6 +273,7 @@ static ssize_t cm4040_read(struct file *filp, char __user *buf,
         DEBUGP(6, dev, "BytesToRead=%lu\n", bytes_to_read);
 
         min_bytes_to_read = min(count, bytes_to_read + 5);
+        min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
 
         DEBUGP(6, dev, "Min=%lu\n", min_bytes_to_read);
 
@@ -340,7 +341,7 @@ static ssize_t cm4040_write(struct file *filp, const char __user *buf,
                 return 0;
         }
 
-        if (count < 5) {
+        if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
                 DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
                 return -EIO;
         }