On Wed, Feb 24, 2021 at 07:51:56AM -0500, Sasha Levin wrote:
> From: "Andrea Parri (Microsoft)" <[email protected]>
>
> [ Upstream commit e99c4afbee07e9323e9191a20b24d74dbf815bdf ]
>
> __vmbus_open() and vmbus_teardown_gpadl() do not inizialite the memory
> for the vmbus_channel_open_channel and the vmbus_channel_gpadl_teardown
> objects they allocate respectively. These objects contain padding bytes
> and fields that are left uninitialized and that are later sent to the
> host, potentially leaking guest data. Zero initialize such fields to
> avoid leaking sensitive information to the host.
>
> Reported-by: Juan Vazquez <[email protected]>
> Signed-off-by: Andrea Parri (Microsoft) <[email protected]>
> Reviewed-by: Michael Kelley <[email protected]>
> Link: https://lore.kernel.org/r/[email protected]
> Signed-off-by: Wei Liu <[email protected]>
> Signed-off-by: Sasha Levin <[email protected]>
Same here.
Andrea
> ---
> drivers/hv/channel.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
> index fbdda9938039a..f9f04b5cd303f 100644
> --- a/drivers/hv/channel.c
> +++ b/drivers/hv/channel.c
> @@ -548,7 +548,7 @@ static int __vmbus_open(struct vmbus_channel *newchannel,
> goto error_clean_ring;
>
> /* Create and init the channel open message */
> - open_info = kmalloc(sizeof(*open_info) +
> + open_info = kzalloc(sizeof(*open_info) +
> sizeof(struct vmbus_channel_open_channel),
> GFP_KERNEL);
> if (!open_info) {
> @@ -674,7 +674,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel,
> u32 gpadl_handle)
> unsigned long flags;
> int ret;
>
> - info = kmalloc(sizeof(*info) +
> + info = kzalloc(sizeof(*info) +
> sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
> if (!info)
> return -ENOMEM;
> --
> 2.27.0
>
