diff options
Diffstat (limited to 'main/linux-grsec/0006-r8169-offical-fix-for-CVE-2009-4537-overlength-frame.patch')
| -rw-r--r-- | main/linux-grsec/0006-r8169-offical-fix-for-CVE-2009-4537-overlength-frame.patch | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/main/linux-grsec/0006-r8169-offical-fix-for-CVE-2009-4537-overlength-frame.patch b/main/linux-grsec/0006-r8169-offical-fix-for-CVE-2009-4537-overlength-frame.patch deleted file mode 100644 index 03ea13fa..00000000 --- a/main/linux-grsec/0006-r8169-offical-fix-for-CVE-2009-4537-overlength-frame.patch +++ /dev/null @@ -1,120 +0,0 @@ -From a60cfaf3df9cd0cddbc24695434ed5bfa917d505 Mon Sep 17 00:00:00 2001 -From: Neil Horman <nhorman@redhat.com> -Date: Mon, 29 Mar 2010 13:16:02 -0700 -Subject: [PATCH 06/18] r8169: offical fix for CVE-2009-4537 (overlength frame DMAs) - -Official patch to fix the r8169 frame length check error. - -Based on this initial thread: -http://marc.info/?l=linux-netdev&m=126202972828626&w=1 -This is the official patch to fix the frame length problems in the r8169 -driver. As noted in the previous thread, while this patch incurs a performance -hit on the driver, its possible to improve performance dynamically by updating -the mtu and rx_copybreak values at runtime to return performance to what it was -for those NICS which are unaffected by the ideosyncracy (if there are any). - -Summary: - - A while back Eric submitted a patch for r8169 in which the proper -allocated frame size was written to RXMaxSize to prevent the NIC from dmaing too -much data. This was done in commit fdd7b4c3302c93f6833e338903ea77245eb510b4. A -long time prior to that however, Francois posted -126fa4b9ca5d9d7cb7d46f779ad3bd3631ca387c, which expiclitly disabled the MaxSize -setting due to the fact that the hardware behaved in odd ways when overlong -frames were received on NIC's supported by this driver. This was mentioned in a -security conference recently: -http://events.ccc.de/congress/2009/Fahrplan//events/3596.en.html - -It seems that if we can't enable frame size filtering, then, as Eric correctly -noticed, we can find ourselves DMA-ing too much data to a buffer, causing -corruption. As a result is seems that we are forced to allocate a frame which -is ready to handle a maximally sized receive. - -This obviously has performance issues with it, so to mitigate that issue, this -patch does two things: - -1) Raises the copybreak value to the frame allocation size, which should force -appropriately sized packets to get allocated on rx, rather than a full new 16k -buffer. - -2) This patch only disables frame filtering initially (i.e., during the NIC -open), changing the MTU results in ring buffer allocation of a size in relation -to the new mtu (along with a warning indicating that this is dangerous). - -Because of item (2), individuals who can't cope with the performance hit (or can -otherwise filter frames to prevent the bug), or who have hardware they are sure -is unaffected by this issue, can manually lower the copybreak and reset the mtu -such that performance is restored easily. - -Signed-off-by: Neil Horman <nhorman@redhat.com> -Signed-off-by: David S. Miller <davem@davemloft.net> -(cherry picked from commit c0cd884af045338476b8e69a61fceb3f34ff22f1) ---- - drivers/net/r8169.c | 29 ++++++++++++++++++++++++----- - 1 files changed, 24 insertions(+), 5 deletions(-) - -diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c -index 24599b5..1484528 100644 ---- a/drivers/net/r8169.c -+++ b/drivers/net/r8169.c -@@ -186,7 +186,12 @@ static struct pci_device_id rtl8169_pci_tbl[] = { - - MODULE_DEVICE_TABLE(pci, rtl8169_pci_tbl); - --static int rx_copybreak = 200; -+/* -+ * we set our copybreak very high so that we don't have -+ * to allocate 16k frames all the time (see note in -+ * rtl8169_open() -+ */ -+static int rx_copybreak = 16383; - static int use_dac; - static struct { - u32 msg_enable; -@@ -3245,9 +3250,13 @@ static void __devexit rtl8169_remove_one(struct pci_dev *pdev) - } - - static void rtl8169_set_rxbufsize(struct rtl8169_private *tp, -- struct net_device *dev) -+ unsigned int mtu) - { -- unsigned int max_frame = dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; -+ unsigned int max_frame = mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; -+ -+ if (max_frame != 16383) -+ printk(KERN_WARNING "WARNING! Changing of MTU on this NIC" -+ "May lead to frame reception errors!\n"); - - tp->rx_buf_sz = (max_frame > RX_BUF_SIZE) ? max_frame : RX_BUF_SIZE; - } -@@ -3259,7 +3268,17 @@ static int rtl8169_open(struct net_device *dev) - int retval = -ENOMEM; - - -- rtl8169_set_rxbufsize(tp, dev); -+ /* -+ * Note that we use a magic value here, its wierd I know -+ * its done because, some subset of rtl8169 hardware suffers from -+ * a problem in which frames received that are longer than -+ * the size set in RxMaxSize register return garbage sizes -+ * when received. To avoid this we need to turn off filtering, -+ * which is done by setting a value of 16383 in the RxMaxSize register -+ * and allocating 16k frames to handle the largest possible rx value -+ * thats what the magic math below does. -+ */ -+ rtl8169_set_rxbufsize(tp, 16383 - VLAN_ETH_HLEN - ETH_FCS_LEN); - - /* - * Rx and Tx desscriptors needs 256 bytes alignment. -@@ -3912,7 +3931,7 @@ static int rtl8169_change_mtu(struct net_device *dev, int new_mtu) - - rtl8169_down(dev); - -- rtl8169_set_rxbufsize(tp, dev); -+ rtl8169_set_rxbufsize(tp, dev->mtu); - - ret = rtl8169_init_ring(dev); - if (ret < 0) --- -1.7.0.2 - |