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Message-ID: <1401671066.14007.102.camel@deadeye.wl.decadent.org.uk>
Date: Mon, 02 Jun 2014 02:04:26 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Venkat Duvvuru <VenkatKumar.Duvvuru@...lex.com>
Subject: [PATCH net-next 8/8] ethtool: Check that reserved fields of struct
ethtool_rxfh are 0
We should fail rather than silently ignoring use of these extensions.
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
net/core/ethtool.c | 89 ++++++++++++++++++++++--------------------------------
1 file changed, 36 insertions(+), 53 deletions(-)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 8ae452a..17cb912 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -681,11 +681,11 @@ static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
{
int ret;
const struct ethtool_ops *ops = dev->ethtool_ops;
- u32 user_indir_size = 0, user_key_size = 0;
+ u32 user_indir_size, user_key_size;
u32 dev_indir_size = 0, dev_key_size = 0;
+ struct ethtool_rxfh rxfh;
u32 total_size;
- u32 indir_offset, indir_bytes;
- u32 key_offset;
+ u32 indir_bytes;
u32 *indir = NULL;
u8 *hkey = NULL;
u8 *rss_config;
@@ -697,33 +697,24 @@ static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
if (ops->get_rxfh_indir_size)
dev_indir_size = ops->get_rxfh_indir_size(dev);
-
- indir_offset = offsetof(struct ethtool_rxfh, indir_size);
-
- if (copy_from_user(&user_indir_size,
- useraddr + indir_offset,
- sizeof(user_indir_size)))
- return -EFAULT;
-
- if (copy_to_user(useraddr + indir_offset,
- &dev_indir_size, sizeof(dev_indir_size)))
- return -EFAULT;
-
if (ops->get_rxfh_key_size)
dev_key_size = ops->get_rxfh_key_size(dev);
if ((dev_key_size + dev_indir_size) == 0)
return -EOPNOTSUPP;
- key_offset = offsetof(struct ethtool_rxfh, key_size);
-
- if (copy_from_user(&user_key_size,
- useraddr + key_offset,
- sizeof(user_key_size)))
+ if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
return -EFAULT;
+ user_indir_size = rxfh.indir_size;
+ user_key_size = rxfh.key_size;
- if (copy_to_user(useraddr + key_offset,
- &dev_key_size, sizeof(dev_key_size)))
+ /* Check that reserved fields are 0 for now */
+ if (rxfh.rss_context || rxfh.rsvd[0] || rxfh.rsvd[1])
+ return -EINVAL;
+
+ rxfh.indir_size = dev_indir_size;
+ rxfh.key_size = dev_key_size;
+ if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
return -EFAULT;
/* If the user buffer size is 0, this is just a query for the
@@ -768,12 +759,11 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
int ret;
const struct ethtool_ops *ops = dev->ethtool_ops;
struct ethtool_rxnfc rx_rings;
- u32 user_indir_size = 0, dev_indir_size = 0, i;
- u32 user_key_size = 0, dev_key_size = 0;
+ struct ethtool_rxfh rxfh;
+ u32 dev_indir_size = 0, dev_key_size = 0, i;
u32 *indir = NULL, indir_bytes = 0;
u8 *hkey = NULL;
u8 *rss_config;
- u32 indir_offset, key_offset;
u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
if (!(ops->get_rxfh_indir_size || ops->get_rxfh_key_size) ||
@@ -782,40 +772,33 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
if (ops->get_rxfh_indir_size)
dev_indir_size = ops->get_rxfh_indir_size(dev);
-
- indir_offset = offsetof(struct ethtool_rxfh, indir_size);
- if (copy_from_user(&user_indir_size,
- useraddr + indir_offset,
- sizeof(user_indir_size)))
- return -EFAULT;
-
if (ops->get_rxfh_key_size)
dev_key_size = dev->ethtool_ops->get_rxfh_key_size(dev);
-
if ((dev_key_size + dev_indir_size) == 0)
return -EOPNOTSUPP;
- key_offset = offsetof(struct ethtool_rxfh, key_size);
- if (copy_from_user(&user_key_size,
- useraddr + key_offset,
- sizeof(user_key_size)))
+ if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
return -EFAULT;
+ /* Check that reserved fields are 0 for now */
+ if (rxfh.rss_context || rxfh.rsvd[0] || rxfh.rsvd[1])
+ return -EINVAL;
+
/* If either indir or hash key is valid, proceed further.
* It is not valid to request that both be unchanged.
*/
- if ((user_indir_size &&
- user_indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
- user_indir_size != dev_indir_size) ||
- (user_key_size && (user_key_size != dev_key_size)) ||
- (user_indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
- user_key_size == 0))
+ if ((rxfh.indir_size &&
+ rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
+ rxfh.indir_size != dev_indir_size) ||
+ (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
+ (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
+ rxfh.key_size == 0))
return -EINVAL;
- if (user_indir_size != ETH_RXFH_INDIR_NO_CHANGE)
+ if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
indir_bytes = dev_indir_size * sizeof(indir[0]);
- rss_config = kzalloc(indir_bytes + user_key_size, GFP_USER);
+ rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
if (!rss_config)
return -ENOMEM;
@@ -824,29 +807,29 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
if (ret)
goto out;
- /* user_indir_size == 0 means reset the indir table to default.
- * user_indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
+ /* rxfh.indir_size == 0 means reset the indir table to default.
+ * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
*/
- if (user_indir_size &&
- user_indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
+ if (rxfh.indir_size &&
+ rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
indir = (u32 *)rss_config;
ret = ethtool_copy_validate_indir(indir,
useraddr + rss_cfg_offset,
&rx_rings,
- user_indir_size);
+ rxfh.indir_size);
if (ret)
goto out;
- } else if (user_indir_size == 0) {
+ } else if (rxfh.indir_size == 0) {
indir = (u32 *)rss_config;
for (i = 0; i < dev_indir_size; i++)
indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
}
- if (user_key_size) {
+ if (rxfh.key_size) {
hkey = rss_config + indir_bytes;
if (copy_from_user(hkey,
useraddr + rss_cfg_offset + indir_bytes,
- user_key_size)) {
+ rxfh.key_size)) {
ret = -EFAULT;
goto out;
}
--
Ben Hutchings
Any smoothly functioning technology is indistinguishable from a rigged demo.
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