From: Ben Hutchings Date: Thu, 15 May 2014 15:28:07 +0000 (+0100) Subject: ethtool: Check that reserved fields of struct ethtool_rxfh are 0 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f062a3844845d267e3716cbc188ad502a15898b7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 --- diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 8ae452afb545..17cb912793fa 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; }