ublk: fix struct ublksrv_ctrl_cmd accesses#539
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ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access. Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set. Fixes: 71f28f3 ("ublk_drv: add io_uring based userspace block driver") Signed-off-by: Govindarajulu Varadarajan <govind.varadar@gmail.com> Reviewed-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com>
struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in userspace-mapped memory. It's racy to access its fields with normal loads, as userspace may write to them concurrently. Use READ_ONCE() to copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the local copy in place of the one in the io_uring_sqe. Fixes: 87213b0 ("ublk: allow non-blocking ctrl cmds in IO_URING_F_NONBLOCK issue") Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com>
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ublk_ctrl_start_recovery() only uses its const struct ublksrv_ctrl_cmd * header argument to log the dev_id. But this value is already available in struct ublk_device's ub_number field. So log ub_number instead and drop the unused header argument. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com>
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Pull request for series with
subject: ublk: fix struct ublksrv_ctrl_cmd accesses
version: 2
url: https://patchwork.kernel.org/project/linux-block/list/?series=1049091