From: "Andrea Parri (Microsoft)" <parri.andrea@xxxxxxxxx> [ 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 <juvazq@xxxxxxxxxxxxx> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx> Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20201209070827.29335-2-parri.andrea@xxxxxxxxx Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 6fb0c76bfbf81..0bd202de79600 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -618,7 +618,7 @@ 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) { @@ -745,7 +745,7 @@ 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
