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    Subject[PATCH v16 12/16] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr()
    From
    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 5a3a1780ceea..f88ee733e617 100644
    --- a/drivers/infiniband/core/uverbs_cmd.c
    +++ b/drivers/infiniband/core/uverbs_cmd.c
    @@ -709,6 +709,8 @@ 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;

    @@ -791,6 +793,8 @@ 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;

    --
    2.22.0.rc1.311.g5d7573a151-goog
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