[PATCH v4] vmci: prevent speculation leaks by sanitizing event in event_deliver()

From: Hagar Hemdan <hagarhem@amazon.com>
Cc: Maximilian Heyne <mheyne@amazon.de>,
	Norbert Manthey <nmanthey@amazon.de>,
	Hagar Gamal Halim Hemdan <hagarhem@amazon.com>,
	Bryan Tan <bryan-bt.tan@broadcom.com>,
	Vishnu Dasa <vishnu.dasa@broadcom.com>,
	Broadcom internal kernel review list
	<bcm-kernel-feedback-list@broadcom.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dmitry Torokhov <dtor@vmware.com>,
	George Zhang <georgezhang@vmware.com>,
	Andy king <acking@vmware.com>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v4] vmci: prevent speculation leaks by sanitizing event in event_deliver()
Date: Tue, 30 Apr 2024 08:59:16 +0000	[thread overview]
Message-ID: <20240430085916.4753-1-hagarhem@amazon.com> (raw)

From: Hagar Gamal Halim Hemdan <hagarhem@amazon.com>

Coverity spotted that event_msg is controlled by user-space,
event_msg->event_data.event is passed to event_deliver() and used
as an index without sanitization.

This change ensures that the event index is sanitized to mitigate any
possibility of speculative information leaks.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Only compile tested, no access to HW.

Fixes: 1d990201f9bb ("VMCI: event handling implementation.")
Signed-off-by: Hagar Gamal Halim Hemdan <hagarhem@amazon.com>
---
v4: Added the testing state in the commit message and rebased on top of
latest mainline
---
 drivers/misc/vmw_vmci/vmci_event.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/vmw_vmci/vmci_event.c b/drivers/misc/vmw_vmci/vmci_event.c
index 5d7ac07623c2..9a41ab65378d 100644
--- a/drivers/misc/vmw_vmci/vmci_event.c
+++ b/drivers/misc/vmw_vmci/vmci_event.c
@@ -9,6 +9,7 @@
 #include <linux/vmw_vmci_api.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/nospec.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/rculist.h>
@@ -86,9 +87,12 @@ static void event_deliver(struct vmci_event_msg *event_msg)
 {
 	struct vmci_subscription *cur;
 	struct list_head *subscriber_list;
+	u32 sanitized_event, max_vmci_event;
 
 	rcu_read_lock();
-	subscriber_list = &subscriber_array[event_msg->event_data.event];
+	max_vmci_event = ARRAY_SIZE(subscriber_array);
+	sanitized_event = array_index_nospec(event_msg->event_data.event, max_vmci_event);
+	subscriber_list = &subscriber_array[sanitized_event];
 	list_for_each_entry_rcu(cur, subscriber_list, node) {
 		cur->callback(cur->id, &event_msg->event_data,
 			      cur->callback_data);
-- 
2.40.1

