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Message-Id: <20241104222513.3469025-2-kees@kernel.org>
Date: Mon, 4 Nov 2024 14:25:04 -0800
From: Kees Cook <kees@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Kees Cook <kees@...nel.org>,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: [PATCH RFC 2/5] net: core: dev.c confirmed to use classic sockaddr
Add comments about the sockaddr arguments being actual classic "max 14
bytes in sa_data" sockaddr.
Signed-off-by: Kees Cook <kees@...nel.org>
---
net/core/dev.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 582466a0176a..c95779cb42a6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9075,7 +9075,8 @@ EXPORT_SYMBOL(dev_pre_changeaddr_notify);
/**
* dev_set_mac_address - Change Media Access Control Address
* @dev: device
- * @sa: new address
+ * @sa: new address in a classic "struct sockaddr", which will never
+ * have more than 14 bytes in @sa::sa_data
* @extack: netlink extended ack
*
* Change the hardware (MAC) address of the device
@@ -9109,6 +9110,7 @@ EXPORT_SYMBOL(dev_set_mac_address);
DECLARE_RWSEM(dev_addr_sem);
+/* "sa" is a classic sockaddr: it will only ever use 14 bytes from sa_data. */
int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
struct netlink_ext_ack *extack)
{
@@ -9121,6 +9123,7 @@ int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
}
EXPORT_SYMBOL(dev_set_mac_address_user);
+/* "sa" is a classic sockaddr: it will only ever use 14 bytes from sa_data. */
int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name)
{
size_t size = sizeof(sa->sa_data);
--
2.34.1
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