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Date: Mon, 28 Feb 2011 18:22:26 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>,
Alexander Duyck <alexander.h.duyck@...el.com>,
Santwona Behera <santwona.behera@....com>
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next-2.6] ethtool: Compat handling for struct
ethtool_rxnfc
This structure was accidentally defined such that its layout can
differ between 32-bit and 64-bit processes. Add compat structure
definitions and functions to copy from/to user-space with the
necessary adjustments.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
I have not tested this with a driver that implements the
ETHTOOL_{G,S}RXCLSRL* operations. However I have tested the new
functions in a simple userland test harness.
Ben.
include/linux/ethtool.h | 34 ++++++++++++
net/core/ethtool.c | 131 ++++++++++++++++++++++++++++++++++++-----------
2 files changed, 134 insertions(+), 31 deletions(-)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index aac3e2e..b297f28 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -13,6 +13,9 @@
#ifndef _LINUX_ETHTOOL_H
#define _LINUX_ETHTOOL_H
+#ifdef __KERNEL__
+#include <linux/compat.h>
+#endif
#include <linux/types.h>
#include <linux/if_ether.h>
@@ -450,6 +453,37 @@ struct ethtool_rxnfc {
__u32 rule_locs[0];
};
+#ifdef __KERNEL__
+#ifdef CONFIG_COMPAT
+
+struct compat_ethtool_rx_flow_spec {
+ u32 flow_type;
+ union {
+ struct ethtool_tcpip4_spec tcp_ip4_spec;
+ struct ethtool_tcpip4_spec udp_ip4_spec;
+ struct ethtool_tcpip4_spec sctp_ip4_spec;
+ struct ethtool_ah_espip4_spec ah_ip4_spec;
+ struct ethtool_ah_espip4_spec esp_ip4_spec;
+ struct ethtool_usrip4_spec usr_ip4_spec;
+ struct ethhdr ether_spec;
+ u8 hdata[72];
+ } h_u, m_u;
+ compat_u64 ring_cookie;
+ u32 location;
+};
+
+struct compat_ethtool_rxnfc {
+ u32 cmd;
+ u32 flow_type;
+ compat_u64 data;
+ struct compat_ethtool_rx_flow_spec fs;
+ u32 rule_cnt;
+ u32 rule_locs[0];
+};
+
+#endif /* CONFIG_COMPAT */
+#endif /* __KERNEL__ */
+
/**
* struct ethtool_rxfh_indir - command to get or set RX flow hash indirection
* @cmd: Specific command number - %ETHTOOL_GRXFHINDIR or %ETHTOOL_SRXFHINDIR
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index c1a71bb..982f252 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -673,24 +673,111 @@ out:
return ret;
}
+static unsigned long copy_ethtool_rxnfc_from_user(struct ethtool_rxnfc *info,
+ const void __user *useraddr)
+{
+ unsigned long ret;
+
+ /* struct ethtool_rxnfc was originally defined for
+ * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
+ * members. User-space might still be using that
+ * definition. */
+ ret = copy_from_user(info, useraddr,
+ (void *)(&info->data + 1) - (void *)info);
+ if (info->cmd == ETHTOOL_GRXFH || info->cmd == ETHTOOL_SRXFH)
+ return ret;
+
+#ifdef CONFIG_COMPAT
+ if (is_compat_task()) {
+ const struct compat_ethtool_rxnfc __user *user_info = useraddr;
+
+ /* We expect there to be holes between fs.m_u and
+ * fs.ring_cookie and at the end of fs, but nowhere
+ * else.
+ */
+ BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_u) +
+ sizeof(user_info->fs.m_u) !=
+ offsetof(struct ethtool_rxnfc, fs.m_u) +
+ sizeof(info->fs.m_u));
+ BUILD_BUG_ON(
+ offsetof(struct compat_ethtool_rxnfc, fs.location) -
+ offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
+ offsetof(struct ethtool_rxnfc, fs.location) -
+ offsetof(struct ethtool_rxnfc, fs.ring_cookie));
+
+ ret += copy_from_user(&info->fs, &user_info->fs,
+ (void *)(&info->fs.m_u + 1) -
+ (void *)&info->fs);
+ ret += copy_from_user(&info->fs.ring_cookie,
+ &user_info->fs.ring_cookie,
+ (void *)(&info->fs.location + 1) -
+ (void *)&info->fs.ring_cookie);
+ ret += copy_from_user(&info->rule_cnt, &user_info->rule_cnt,
+ sizeof(info->rule_cnt));
+ } else
+#endif
+ {
+ const struct ethtool_rxnfc __user *user_info = useraddr;
+ ret += copy_from_user(&info->fs, &user_info->fs,
+ (void *)(info + 1) - (void *)&info->fs);
+ }
+
+ return ret;
+}
+
+static unsigned long
+copy_ethtool_rxnfc_to_user(void __user *useraddr,
+ const struct ethtool_rxnfc *info,
+ const u32 *rule_buf)
+{
+ u32 __user *user_rule_buf;
+ unsigned long ret;
+
+ ret = copy_to_user(useraddr, info,
+ (const void *)(&info->data + 1) -
+ (const void *)info);
+ if (info->cmd == ETHTOOL_GRXFH)
+ return ret;
+
+#ifdef CONFIG_COMPAT
+ if (is_compat_task()) {
+ struct compat_ethtool_rxnfc __user *user_info = useraddr;
+ ret += copy_to_user(&user_info->fs, &info->fs,
+ (const void *)(&info->fs.m_u + 1) -
+ (const void *)&info->fs);
+ ret += copy_to_user(&user_info->fs.ring_cookie,
+ &info->fs.ring_cookie,
+ (const void *)(&info->fs.location + 1) -
+ (const void *)&info->fs.ring_cookie);
+ ret += copy_to_user(&user_info->rule_cnt, &info->rule_cnt,
+ sizeof(info->rule_cnt));
+ user_rule_buf = &user_info->rule_locs[0];
+ } else
+#endif
+ {
+ struct ethtool_rxnfc __user *user_info = useraddr;
+ ret += copy_to_user(&user_info->fs, &info->fs,
+ (const void *)(info + 1) -
+ (const void *)&info->fs);
+ user_rule_buf = &user_info->rule_locs[0];
+ }
+
+ if (rule_buf)
+ ret += copy_to_user(user_rule_buf, rule_buf,
+ info->rule_cnt * sizeof(u32));
+
+ return ret;
+}
+
static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
u32 cmd, void __user *useraddr)
{
struct ethtool_rxnfc info;
- size_t info_size = sizeof(info);
if (!dev->ethtool_ops->set_rxnfc)
return -EOPNOTSUPP;
- /* struct ethtool_rxnfc was originally defined for
- * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
- * members. User-space might still be using that
- * definition. */
- if (cmd == ETHTOOL_SRXFH)
- info_size = (offsetof(struct ethtool_rxnfc, data) +
- sizeof(info.data));
-
- if (copy_from_user(&info, useraddr, info_size))
+ if (copy_ethtool_rxnfc_from_user(&info, useraddr))
return -EFAULT;
return dev->ethtool_ops->set_rxnfc(dev, &info);
@@ -700,7 +787,6 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
u32 cmd, void __user *useraddr)
{
struct ethtool_rxnfc info;
- size_t info_size = sizeof(info);
const struct ethtool_ops *ops = dev->ethtool_ops;
int ret;
void *rule_buf = NULL;
@@ -708,15 +794,7 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
if (!ops->get_rxnfc)
return -EOPNOTSUPP;
- /* struct ethtool_rxnfc was originally defined for
- * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
- * members. User-space might still be using that
- * definition. */
- if (cmd == ETHTOOL_GRXFH)
- info_size = (offsetof(struct ethtool_rxnfc, data) +
- sizeof(info.data));
-
- if (copy_from_user(&info, useraddr, info_size))
+ if (copy_ethtool_rxnfc_from_user(&info, useraddr))
return -EFAULT;
if (info.cmd == ETHTOOL_GRXCLSRLALL) {
@@ -733,17 +811,8 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
if (ret < 0)
goto err_out;
- ret = -EFAULT;
- if (copy_to_user(useraddr, &info, info_size))
- goto err_out;
-
- if (rule_buf) {
- useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
- if (copy_to_user(useraddr, rule_buf,
- info.rule_cnt * sizeof(u32)))
- goto err_out;
- }
- ret = 0;
+ if (copy_ethtool_rxnfc_to_user(useraddr, &info, rule_buf))
+ ret = -EFAULT;
err_out:
kfree(rule_buf);
--
1.7.4
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
--
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