netdev - [PATCH] usb/mcs7830: Don't use buffers from stack for USB transfers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <34115.192.168.0.40.1232483361.squirrel@server>
Date:	Tue, 20 Jan 2009 21:29:21 +0100 (CET)
From:	"Christian Eggers" <ceggers@....de>
To:	netdev@...r.kernel.org
Cc:	torvalds@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb/mcs7830: Don't use buffers from stack for USB transfers

From: Christian Eggers <christian.eggers@...hrein.de>

mcs7830_set_reg() and mcs7830_get_reg() are called with buffers
from stack which must not be used directly for USB transfers.
This causes corruption of the stack particulary on non x86
architectures because DMA may be used for these transfers.

Signed-off-by: Christian Eggers <christian.eggers@...hrein.de>
---

This is my first patch submission for Linux. I hope everything is fine.

diff -uprN linux-2.6.28.1.orig/drivers/net/usb/mcs7830.c linux-2.6.28.1/drivers/net/usb/mcs7830.c
--- linux-2.6.28.1.orig/drivers/net/usb/mcs7830.c       2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/drivers/net/usb/mcs7830.c    2009-01-20 20:53:59.000000000 +0100
@@ -94,10 +94,18 @@ static int mcs7830_get_reg(struct usbnet
 {
        struct usb_device *xdev = dev->udev;
        int ret;
+       void *buffer;
+
+       buffer = kmalloc(size, GFP_NOIO);
+       if (buffer == NULL)
+               return -ENOMEM;

        ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
-                             MCS7830_RD_BMREQ, 0x0000, index, data,
+                             MCS7830_RD_BMREQ, 0x0000, index, buffer,
                              size, MCS7830_CTRL_TIMEOUT);
+       memcpy(data, buffer, size);
+       kfree(buffer);
+
        return ret;
 }

@@ -105,10 +113,18 @@ static int mcs7830_set_reg(struct usbnet
 {
        struct usb_device *xdev = dev->udev;
        int ret;
+       void *buffer;
+
+       buffer = kmalloc(size, GFP_NOIO);
+       if (buffer == NULL)
+               return -ENOMEM;
+
+       memcpy(buffer, data, size);

        ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
-                             MCS7830_WR_BMREQ, 0x0000, index, data,
+                             MCS7830_WR_BMREQ, 0x0000, index, buffer,
                              size, MCS7830_CTRL_TIMEOUT);
+       kfree(buffer);
        return ret;
 }


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html