vsock/vmci: Clear the vmci transport packet properly when initializing it

[PATCH net] vsock/vmci: Clear the vmci transport packet properly when initializing it

Posted by Greg Kroah-Hartman 7 months, 1 week ago

From: HarshaVardhana S A <harshavardhana.sa@broadcom.com>

In vmci_transport_packet_init memset the vmci_transport_packet before
populating the fields to avoid any uninitialised data being left in the
structure.

Cc: Bryan Tan <bryan-bt.tan@broadcom.com>
Cc: Vishnu Dasa <vishnu.dasa@broadcom.com>
Cc: Broadcom internal kernel review list
Cc: Stefano Garzarella <sgarzare@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>
Cc: virtualization@lists.linux.dev
Cc: netdev@vger.kernel.org
Cc: stable <stable@kernel.org>
Signed-off-by: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Tweaked from original version by rewording the text and adding a blank
line and correctly sending it to the proper people for inclusion in net.

 net/vmw_vsock/vmci_transport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index b370070194fa..7eccd6708d66 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -119,6 +119,8 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
 			   u16 proto,
 			   struct vmci_handle handle)
 {
+	memset(pkt, 0, sizeof(*pkt));
+
 	/* We register the stream control handler as an any cid handle so we
 	 * must always send from a source address of VMADDR_CID_ANY
 	 */
@@ -131,8 +133,6 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
 	pkt->type = type;
 	pkt->src_port = src->svm_port;
 	pkt->dst_port = dst->svm_port;
-	memset(&pkt->proto, 0, sizeof(pkt->proto));
-	memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));
 
 	switch (pkt->type) {
 	case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
-- 
2.50.0

Re: [PATCH net] vsock/vmci: Clear the vmci transport packet properly when initializing it

Posted by Stefano Garzarella 7 months, 1 week ago

On Tue, Jul 01, 2025 at 02:22:54PM +0200, Greg Kroah-Hartman wrote:
>From: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
>
>In vmci_transport_packet_init memset the vmci_transport_packet before
>populating the fields to avoid any uninitialised data being left in the
>structure.
>
>Cc: Bryan Tan <bryan-bt.tan@broadcom.com>
>Cc: Vishnu Dasa <vishnu.dasa@broadcom.com>
>Cc: Broadcom internal kernel review list
>Cc: Stefano Garzarella <sgarzare@redhat.com>
>Cc: "David S. Miller" <davem@davemloft.net>
>Cc: Eric Dumazet <edumazet@google.com>
>Cc: Jakub Kicinski <kuba@kernel.org>
>Cc: Paolo Abeni <pabeni@redhat.com>
>Cc: Simon Horman <horms@kernel.org>
>Cc: virtualization@lists.linux.dev
>Cc: netdev@vger.kernel.org
>Cc: stable <stable@kernel.org>
>Signed-off-by: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
>Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>---
>Tweaked from original version by rewording the text and adding a blank
>line and correctly sending it to the proper people for inclusion in net.
>
> net/vmw_vsock/vmci_transport.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Stefano Garzarella <sgarzare@redhat.com>

Patch LGTM, we can fix the switch later.

Stefano

>
>diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
>index b370070194fa..7eccd6708d66 100644
>--- a/net/vmw_vsock/vmci_transport.c
>+++ b/net/vmw_vsock/vmci_transport.c
>@@ -119,6 +119,8 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
> 			   u16 proto,
> 			   struct vmci_handle handle)
> {
>+	memset(pkt, 0, sizeof(*pkt));
>+
> 	/* We register the stream control handler as an any cid handle so we
> 	 * must always send from a source address of VMADDR_CID_ANY
> 	 */
>@@ -131,8 +133,6 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
> 	pkt->type = type;
> 	pkt->src_port = src->svm_port;
> 	pkt->dst_port = dst->svm_port;
>-	memset(&pkt->proto, 0, sizeof(pkt->proto));
>-	memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));
>
> 	switch (pkt->type) {
> 	case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
>-- 
>2.50.0
>

Re: [PATCH net] vsock/vmci: Clear the vmci transport packet properly when initializing it

Posted by Stefano Garzarella 7 months, 1 week ago

On Tue, Jul 01, 2025 at 02:22:54PM +0200, Greg Kroah-Hartman wrote:
>From: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
>
>In vmci_transport_packet_init memset the vmci_transport_packet before
>populating the fields to avoid any uninitialised data being left in the
>structure.

Usually I would suggest inserting a Fixes tag, but if you didn't put it, 
there's probably a reason :-)

If we are going to add it, I think it should be:

Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")

>
>Cc: Bryan Tan <bryan-bt.tan@broadcom.com>
>Cc: Vishnu Dasa <vishnu.dasa@broadcom.com>
>Cc: Broadcom internal kernel review list
>Cc: Stefano Garzarella <sgarzare@redhat.com>
>Cc: "David S. Miller" <davem@davemloft.net>
>Cc: Eric Dumazet <edumazet@google.com>
>Cc: Jakub Kicinski <kuba@kernel.org>
>Cc: Paolo Abeni <pabeni@redhat.com>
>Cc: Simon Horman <horms@kernel.org>
>Cc: virtualization@lists.linux.dev
>Cc: netdev@vger.kernel.org
>Cc: stable <stable@kernel.org>
>Signed-off-by: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
>Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>---
>Tweaked from original version by rewording the text and adding a blank
>line and correctly sending it to the proper people for inclusion in net.
>
> net/vmw_vsock/vmci_transport.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
>index b370070194fa..7eccd6708d66 100644
>--- a/net/vmw_vsock/vmci_transport.c
>+++ b/net/vmw_vsock/vmci_transport.c
>@@ -119,6 +119,8 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
> 			   u16 proto,
> 			   struct vmci_handle handle)
> {
>+	memset(pkt, 0, sizeof(*pkt));
>+
> 	/* We register the stream control handler as an any cid handle so we
> 	 * must always send from a source address of VMADDR_CID_ANY
> 	 */
>@@ -131,8 +133,6 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
> 	pkt->type = type;
> 	pkt->src_port = src->svm_port;
> 	pkt->dst_port = dst->svm_port;
>-	memset(&pkt->proto, 0, sizeof(pkt->proto));
>-	memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));

Should we also remove some `case`s in the following switch?
I mean something like this:

diff --git a/net/vmw_vsock/vmci_transport.c 
b/net/vmw_vsock/vmci_transport.c
index b370070194fa..d821ddcc62d8 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -135,10 +135,6 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
         memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));

         switch (pkt->type) {
-       case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
-               pkt->u.size = 0;
-               break;
-
         case VMCI_TRANSPORT_PACKET_TYPE_REQUEST:
         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
                 pkt->u.size = size;
@@ -149,12 +145,6 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
                 pkt->u.handle = handle;
                 break;

-       case VMCI_TRANSPORT_PACKET_TYPE_WROTE:
-       case VMCI_TRANSPORT_PACKET_TYPE_READ:
-       case VMCI_TRANSPORT_PACKET_TYPE_RST:
-               pkt->u.size = 0;
-               break;
-
         case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
                 pkt->u.mode = mode;
                 break;

Thanks,
Stefano

>
> 	switch (pkt->type) {
> 	case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
>-- 
>2.50.0
>

Re: [PATCH net] vsock/vmci: Clear the vmci transport packet properly when initializing it

Posted by Greg Kroah-Hartman 7 months, 1 week ago

On Tue, Jul 01, 2025 at 02:42:10PM +0200, Stefano Garzarella wrote:
> On Tue, Jul 01, 2025 at 02:22:54PM +0200, Greg Kroah-Hartman wrote:
> > From: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
> > 
> > In vmci_transport_packet_init memset the vmci_transport_packet before
> > populating the fields to avoid any uninitialised data being left in the
> > structure.
> 
> Usually I would suggest inserting a Fixes tag, but if you didn't put it,
> there's probably a reason :-)
> 
> If we are going to add it, I think it should be:
> 
> Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")

Yeah, I didn't think it was needed as this is obviously a "ever since
this file has been there" type of thing, so it will be backported
everywhere once it hits Linus's tree.

thanks,

greg k-h

Re: [PATCH net] vsock/vmci: Clear the vmci transport packet properly when initializing it

Posted by Stefano Garzarella 7 months, 1 week ago

On Tue, Jul 01, 2025 at 02:56:14PM +0200, Greg Kroah-Hartman wrote:
>On Tue, Jul 01, 2025 at 02:42:10PM +0200, Stefano Garzarella wrote:
>> On Tue, Jul 01, 2025 at 02:22:54PM +0200, Greg Kroah-Hartman wrote:
>> > From: HarshaVardhana S A <harshavardhana.sa@broadcom.com>
>> >
>> > In vmci_transport_packet_init memset the vmci_transport_packet before
>> > populating the fields to avoid any uninitialised data being left in the
>> > structure.
>>
>> Usually I would suggest inserting a Fixes tag, but if you didn't put it,
>> there's probably a reason :-)
>>
>> If we are going to add it, I think it should be:
>>
>> Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")
>
>Yeah, I didn't think it was needed as this is obviously a "ever since
>this file has been there" type of thing, so it will be backported
>everywhere once it hits Linus's tree.

I see, thanks!
Stefano