Subject: [PATCH rdma-next 3/6] RDMA/ucontext: Do not allow BAR mappings to be executable

From: Leon Romanovsky <[email-masked]>
Date: Tue, 16 Apr 2019 14:07:27 +0300

From: Jason Gunthorpe <[email-masked]>

These are not code pages and should never be executed.

Cc: [email-masked]
Fixes: 5f9794dc94f5 ("RDMA/ucontext: Add a core API for mmaping driver IO memory")
Signed-off-by: Jason Gunthorpe <[email-masked]>
Signed-off-by: Leon Romanovsky <[email-masked]>
---
 drivers/infiniband/core/uverbs_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index fef4519d1241..3ef6474cd201 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -889,6 +889,10 @@ static struct rdma_umap_priv *rdma_user_mmap_pre(struct ib_ucontext *ucontext,
 	struct ib_uverbs_file *ufile = ucontext->ufile;
 	struct rdma_umap_priv *priv;
 
+	if (vma->vm_flags & VM_EXEC)
+		return ERR_PTR(-EINVAL);
+	vma->vm_flags &= ~VM_MAYEXEC;
+
 	if (vma->vm_end - vma->vm_start != size)
 		return ERR_PTR(-EINVAL);
 
-- 
2.20.1