Messages in this thread Patch in this message | | | Date | Mon, 6 May 2019 18:30:59 +0200 | Subject | [PATCH v15 13/17] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr() | From | Andrey Konovalov <> |
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This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments.
ib_uverbs_(re)reg_mr() use provided user pointers for vma lookups (through e.g. mlx4_get_umem_mr()), which can only by done with untagged pointers.
Untag user pointers in these functions.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- drivers/infiniband/core/uverbs_cmd.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index 062a86c04123..36e7b52577d0 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -708,6 +708,8 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs) if (ret) return ret; + cmd.start = untagged_addr(cmd.start); + if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)) return -EINVAL; @@ -790,6 +792,8 @@ static int ib_uverbs_rereg_mr(struct uverbs_attr_bundle *attrs) if (ret) return ret; + cmd.start = untagged_addr(cmd.start); + if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags) return -EINVAL; -- 2.21.0.1020.gf2820cf01a-goog
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