Allocations in these drivers that will be mmaped through a uio device
should be made in multiples of PAGE_SIZE to avoid exposing additional
kernel memory unintentionally.

Signed-off-by: Chris Leech <cleech@redhat.com>
---
 drivers/net/ethernet/broadcom/bnx2.c             | 1 +
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 8 ++++----
 drivers/net/ethernet/broadcom/cnic.c             | 9 +++++----
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 0d917a9699c5..84a04eec654a 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -837,6 +837,7 @@ bnx2_alloc_stats_blk(struct net_device *dev)
 						 BNX2_SBLK_MSIX_ALIGN_SIZE);
 	bp->status_stats_size = status_blk_size +
 				sizeof(struct statistics_block);
+	bp->status_stats_size = PAGE_ALIGN(bp->status_stats_size);
 	status_blk = dma_alloc_coherent(&bp->pdev->dev, bp->status_stats_size,
 					&bp->status_blk_mapping, GFP_KERNEL);
 	if (!status_blk)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 0d8e61c63c7c..2fcde42a05c1 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -8270,10 +8270,10 @@ void bnx2x_free_mem_cnic(struct bnx2x *bp)
 
 	if (!CHIP_IS_E1x(bp))
 		BNX2X_PCI_FREE(bp->cnic_sb.e2_sb, bp->cnic_sb_mapping,
-			       sizeof(struct host_hc_status_block_e2));
+			PAGE_ALIGN(sizeof(struct host_hc_status_block_e2)));
 	else
 		BNX2X_PCI_FREE(bp->cnic_sb.e1x_sb, bp->cnic_sb_mapping,
-			       sizeof(struct host_hc_status_block_e1x));
+			PAGE_ALIGN(sizeof(struct host_hc_status_block_e1x)));
 
 	BNX2X_PCI_FREE(bp->t2, bp->t2_mapping, SRC_T2_SZ);
 }
@@ -8316,12 +8316,12 @@ int bnx2x_alloc_mem_cnic(struct bnx2x *bp)
 	if (!CHIP_IS_E1x(bp)) {
 		/* size = the status block + ramrod buffers */
 		bp->cnic_sb.e2_sb = BNX2X_PCI_ALLOC(&bp->cnic_sb_mapping,
-						    sizeof(struct host_hc_status_block_e2));
+					PAGE_ALIGN(sizeof(struct host_hc_status_block_e2)));
 		if (!bp->cnic_sb.e2_sb)
 			goto alloc_mem_err;
 	} else {
 		bp->cnic_sb.e1x_sb = BNX2X_PCI_ALLOC(&bp->cnic_sb_mapping,
-						     sizeof(struct host_hc_status_block_e1x));
+					PAGE_ALIGN(sizeof(struct host_hc_status_block_e1x)));
 		if (!bp->cnic_sb.e1x_sb)
 			goto alloc_mem_err;
 	}
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index 7926aaef8f0c..67ec397bd171 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -1026,13 +1026,14 @@ static int __cnic_alloc_uio_rings(struct cnic_uio_dev *udev, int pages)
 		return 0;
 
 	udev->l2_ring_size = pages * CNIC_PAGE_SIZE;
+	udev->l2_ring_size = PAGE_ALIGN(udev->l2_ring_size);
 	udev->l2_ring = dma_alloc_coherent(&udev->pdev->dev, udev->l2_ring_size,
 					   &udev->l2_ring_map, GFP_KERNEL);
 	if (!udev->l2_ring)
 		return -ENOMEM;
 
 	udev->l2_buf_size = (cp->l2_rx_ring_size + 1) * cp->l2_single_buf_size;
-	udev->l2_buf_size = CNIC_PAGE_ALIGN(udev->l2_buf_size);
+	udev->l2_buf_size = PAGE_ALIGN(udev->l2_buf_size);
 	udev->l2_buf = dma_alloc_coherent(&udev->pdev->dev, udev->l2_buf_size,
 					  &udev->l2_buf_map, GFP_KERNEL);
 	if (!udev->l2_buf) {
@@ -1108,9 +1109,9 @@ static int cnic_init_uio(struct cnic_dev *dev)
 		uinfo->mem[1].addr = (unsigned long) cp->status_blk.gen &
 					CNIC_PAGE_MASK;
 		if (cp->ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX)
-			uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE * 9;
+			uinfo->mem[1].size = PAGE_ALIGN(BNX2_SBLK_MSIX_ALIGN_SIZE * 9);
 		else
-			uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE;
+			uinfo->mem[1].size = PAGE_ALIGN(BNX2_SBLK_MSIX_ALIGN_SIZE);
 
 		uinfo->name = "bnx2_cnic";
 	} else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
@@ -1118,7 +1119,7 @@ static int cnic_init_uio(struct cnic_dev *dev)
 
 		uinfo->mem[1].addr = (unsigned long) cp->bnx2x_def_status_blk &
 			CNIC_PAGE_MASK;
-		uinfo->mem[1].size = sizeof(*cp->bnx2x_def_status_blk);
+		uinfo->mem[1].size = PAGE_ALIGN(sizeof(*cp->bnx2x_def_status_blk));
 
 		uinfo->name = "bnx2x_cnic";
 	}
-- 
2.41.0

On Fri, Sep 29, 2023 at 10:00:22AM -0700, Chris Leech wrote:
> Allocations in these drivers that will be mmaped through a uio device
> should be made in multiples of PAGE_SIZE to avoid exposing additional
> kernel memory unintentionally.

dma coherent allocations are always rounded up to a page, although
the documentation for that is somewhat obscure and I wouldn't fault
anyone for not relying on it.

On 9/29/2023 10:00 AM, Chris Leech wrote:
> Allocations in these drivers that will be mmaped through a uio device
> should be made in multiples of PAGE_SIZE to avoid exposing additional
> kernel memory unintentionally.
> 
> Signed-off-by: Chris Leech <cleech@redhat.com>
> ---

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>