From: walter harms <wharms@bfs.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: linux-kernel@vger.kernel.org,
George Zhang <georgezhang@vmware.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
kernel-janitors@vger.kernel.org
Subject: Re: [patch] VMCI: integer overflow in vmci_datagram_dispatch()
Date: Fri, 29 Aug 2014 11:13:47 +0000 [thread overview]
Message-ID: <5400606B.8010905@bfs.de> (raw)
In-Reply-To: <20140829084256.GA14780@mwanda>
Am 29.08.2014 10:42, schrieb Dan Carpenter:
> This is untrusted user data from vmci_host_do_send_datagram() so the
> VMCI_DG_SIZE() macro can have an integer overflow.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/misc/vmw_vmci/vmci_datagram.c b/drivers/misc/vmw_vmci/vmci_datagram.c
> index f3cdd90..8226652 100644
> --- a/drivers/misc/vmw_vmci/vmci_datagram.c
> +++ b/drivers/misc/vmw_vmci/vmci_datagram.c
> @@ -328,7 +328,8 @@ int vmci_datagram_dispatch(u32 context_id,
>
> BUILD_BUG_ON(sizeof(struct vmci_datagram) != 24);
>
> - if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
> + if (dg->payload_size > VMCI_MAX_DG_SIZE ||
> + VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
> pr_devel("Payload (size=%llu bytes) too big to send\n",
> (unsigned long long)dg->payload_size);
> return VMCI_ERROR_INVALID_ARGS;
Are your sure about that ">" ? maybe ">=" was intended ?
re,
wh
> --
> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
WARNING: multiple messages have this Message-ID (diff)
From: walter harms <wharms@bfs.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: linux-kernel@vger.kernel.org,
George Zhang <georgezhang@vmware.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
kernel-janitors@vger.kernel.org
Subject: Re: [patch] VMCI: integer overflow in vmci_datagram_dispatch()
Date: Fri, 29 Aug 2014 13:13:47 +0200 [thread overview]
Message-ID: <5400606B.8010905@bfs.de> (raw)
In-Reply-To: <20140829084256.GA14780@mwanda>
Am 29.08.2014 10:42, schrieb Dan Carpenter:
> This is untrusted user data from vmci_host_do_send_datagram() so the
> VMCI_DG_SIZE() macro can have an integer overflow.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/misc/vmw_vmci/vmci_datagram.c b/drivers/misc/vmw_vmci/vmci_datagram.c
> index f3cdd90..8226652 100644
> --- a/drivers/misc/vmw_vmci/vmci_datagram.c
> +++ b/drivers/misc/vmw_vmci/vmci_datagram.c
> @@ -328,7 +328,8 @@ int vmci_datagram_dispatch(u32 context_id,
>
> BUILD_BUG_ON(sizeof(struct vmci_datagram) != 24);
>
> - if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
> + if (dg->payload_size > VMCI_MAX_DG_SIZE ||
> + VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
> pr_devel("Payload (size=%llu bytes) too big to send\n",
> (unsigned long long)dg->payload_size);
> return VMCI_ERROR_INVALID_ARGS;
Are your sure about that ">" ? maybe ">=" was intended ?
re,
wh
> --
> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
next prev parent reply other threads:[~2014-08-29 11:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-29 8:42 [patch] VMCI: integer overflow in vmci_datagram_dispatch() Dan Carpenter
2014-08-29 8:42 ` Dan Carpenter
2014-08-29 11:13 ` walter harms [this message]
2014-08-29 11:13 ` walter harms
2014-08-29 11:21 ` Dan Carpenter
2014-08-29 11:21 ` Dan Carpenter
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