diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2019-07-23 19:58:48 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-07-24 21:22:54 +0200 |
| commit | ecc53f8a3c097d13f4b6793855e0bd30a63a5c3a (patch) | |
| tree | bbd0be74f050876d4d9e4a30bc45b1a88981634d /drivers/infiniband | |
| parent | IB/hfi1: Remove unused define (diff) | |
| download | linux-ecc53f8a3c097d13f4b6793855e0bd30a63a5c3a.tar.xz linux-ecc53f8a3c097d13f4b6793855e0bd30a63a5c3a.zip | |
RDMA/mlx4: Untag user pointers in mlx4_get_umem_mr
This patch is a part of a series that extends kernel ABI to allow to pass
tagged user pointers (with the top byte set to something else other than
0x00) as syscall arguments.
mlx4_get_umem_mr() uses provided user pointers for vma lookups, which can
only by done with untagged pointers.
Untag user pointers in this function.
Link: https://lore.kernel.org/r/7969018013a67ddbbf784ac7afeea5a57b1e2bcb.1563904656.git.andreyknvl@google.com
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/mlx4/mr.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c index 753479285ce9..6ae503cfc526 100644 --- a/drivers/infiniband/hw/mlx4/mr.c +++ b/drivers/infiniband/hw/mlx4/mr.c @@ -377,6 +377,7 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * again */ if (!ib_access_writable(access_flags)) { + unsigned long untagged_start = untagged_addr(start); struct vm_area_struct *vma; down_read(¤t->mm->mmap_sem); @@ -385,9 +386,9 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * cover the memory, but for now it requires a single vma to * entirely cover the MR to support RO mappings. */ - vma = find_vma(current->mm, start); - if (vma && vma->vm_end >= start + length && - vma->vm_start <= start) { + vma = find_vma(current->mm, untagged_start); + if (vma && vma->vm_end >= untagged_start + length && + vma->vm_start <= untagged_start) { if (vma->vm_flags & VM_WRITE) access_flags |= IB_ACCESS_LOCAL_WRITE; } else { |