linux-kernel - [PATCH v2 1/1] e1000e: fix heap overflow in e1000_set

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Message-ID: <20250527085612.11354-2-post@mikaelkw.online>
Date: Tue, 27 May 2025 10:56:12 +0200
From: Mikael Wessel <post@...aelkw.online>
To: netdev@...r.kernel.org
Cc: intel-wired-lan@...ts.osuosl.org,
	torvalds@...uxfoundation.org,
	anthony.l.nguyen@...el.com,
	przemyslaw.kitszel@...el.com,
	andrew@...n.ch,
	kuba@...nel.org,
	pabeni@...hat.com,
	security@...nel.org,
	stable@...r.kernel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	linux-kernel@...r.kernel.org,
	Mikael Wessel <post@...aelkw.online>
Subject: [PATCH v2 1/1] e1000e: fix heap overflow in e1000_set_eeprom()

The ETHTOOL_SETEEPROM ioctl copies user data into a kmalloc'ed buffer
without validating eeprom->len and eeprom->offset.  A CAP_NET_ADMIN
user can overflow the heap and crash the kernel or gain code execution.

Validate length and offset before memcpy().

Fixes: bc7f75fa9788 ("[E1000E]: New pci-express e1000 driver (currently for ICH9 devices only)")
Reported-by: Mikael Wessel <post@...aelkw.online>
Signed-off-by: Mikael Wessel <post@...aelkw.online>
Cc: stable@...r.kernel.org
---
 drivers/net/ethernet/intel/e1000e/ethtool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 9364bc2b4eb1..98e541e39730 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -596,6 +596,9 @@ static int e1000_set_eeprom(struct net_device *netdev,
 	for (i = 0; i < last_word - first_word + 1; i++)
 		le16_to_cpus(&eeprom_buff[i]);
 
+        if (eeprom->len > max_len ||
+            eeprom->offset > max_len - eeprom->len)
+                return -EINVAL;
 	memcpy(ptr, bytes, eeprom->len);
 
 	for (i = 0; i < last_word - first_word + 1; i++)
-- 
2.48.1