sunvdc: Remove VLA usage

In the quest to remove all stack VLA usage from the kernel[1], this moves
the math for cookies calculation into macros and allocates a fixed size
array for the maximum number of cookies and adds a runtime sanity check.
(Note that the size was always fixed, but just hidden from the compiler.)

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 5ca56bf..f68e9ba 100644 (file)
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -36,6 +36,10 @@ MODULE_VERSION(DRV_MODULE_VERSION);
 #define VDC_TX_RING_SIZE       512
 #define VDC_DEFAULT_BLK_SIZE   512
 
+#define MAX_XFER_BLKS          (128 * 1024)
+#define MAX_XFER_SIZE          (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE)
+#define MAX_RING_COOKIES       ((MAX_XFER_BLKS / PAGE_SIZE) + 2)
+
 #define WAITING_FOR_LINK_UP    0x01
 #define WAITING_FOR_TX_SPACE   0x02
 #define WAITING_FOR_GEN_CMD    0x04
@@ -450,7 +454,7 @@ static int __send_request(struct request *req)
 {
        struct vdc_port *port = req->rq_disk->private_data;
        struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-       struct scatterlist sg[port->ring_cookies];
+       struct scatterlist sg[MAX_RING_COOKIES];
        struct vdc_req_entry *rqe;
        struct vio_disk_desc *desc;
        unsigned int map_perm;
@@ -458,6 +462,9 @@ static int __send_request(struct request *req)
        u64 len;
        u8 op;
 
+       if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES))
+               return -EINVAL;
+
        map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
 
        if (rq_data_dir(req) == READ) {
@@ -984,9 +991,8 @@ static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
                goto err_out_free_port;
 
        port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE;
-       port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
-       port->ring_cookies = ((port->max_xfer_size *
-                              port->vdisk_block_size) / PAGE_SIZE) + 2;
+       port->max_xfer_size = MAX_XFER_SIZE;
+       port->ring_cookies = MAX_RING_COOKIES;
 
        err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
        if (err)