linux-kernel - [PATCH] net: randomize layout of struct net

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Message-ID: <20250602135932.464194-1-pranav.tyagi03@gmail.com>
Date: Mon,  2 Jun 2025 19:29:32 +0530
From: Pranav Tyagi <pranav.tyagi03@...il.com>
To: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	keescook@...omium.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linux.dev
Cc: Pranav Tyagi <pranav.tyagi03@...il.com>
Subject: [PATCH] net: randomize layout of struct net_device

Add __randomize_layout to struct net_device to support structure layout
randomization if CONFIG_RANDSTRUCT is enabled else the macro expands to
do nothing. This enhances kernel protection by making it harder to
predict the memory layout of this structure.

Link: https://github.com/KSPP/linux/issues/188
Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>
---
 include/linux/netdevice.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7ea022750e4e..0caff664ef3a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2077,7 +2077,11 @@ enum netdev_reg_state {
  *	moves out.
  */
 
+#ifdef CONFIG_RANDSTRUCT
+struct __randomize_layout net_device {
+#else
 struct net_device {
+#endif
 	/* Cacheline organization can be found documented in
 	 * Documentation/networking/net_cachelines/net_device.rst.
 	 * Please update the document when adding new fields.
-- 
2.49.0