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ublk: reject FETCH from non-userspace context #787

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ublk: reject FETCH from non-userspace context #787

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15 changes: 11 additions & 4 deletions drivers/block/ublk_drv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3251,12 +3251,19 @@ static int __ublk_fetch(struct io_uring_cmd *cmd, struct ublk_device *ub,

WARN_ON_ONCE(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV);

ublk_fill_io_cmd(io, cmd);

if (ublk_dev_support_batch_io(ub))
if (ublk_dev_support_batch_io(ub)) {
WRITE_ONCE(io->task, NULL);
else
} else {
/*
* FETCH must come from a real userspace task, not a
* kworker is actually io_uring fallback workqueue.
*/
if (current->flags & (PF_KTHREAD | PF_WQ_WORKER))
return -EINVAL;
WRITE_ONCE(io->task, get_task_struct(current));
}

ublk_fill_io_cmd(io, cmd);

return 0;
}
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