Merge tag 'io_uring-5.5-2020-01-26' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
"Fix for two regressions in this cycle, both reported by the postgresql
use case.

One removes the added restriction on who can submit IO, making it
possible for rings shared across forks to do so. The other fixes an
issue for the same kind of use case, where one exiting process would
cancel all IO"

* tag 'io_uring-5.5-2020-01-26' of git://git.kernel.dk/linux-block:
io_uring: don't cancel all work on process exit
Revert "io_uring: only allow submit from owning task"

fs/io_uring.c

···
 	struct io_ring_ctx *ctx = file->private_data;
 
 	io_uring_cancel_files(ctx, data);
-	if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) {
-		io_cqring_overflow_flush(ctx, true);
-		io_wq_cancel_all(ctx->io_wq);
-	}
 	return 0;
 }
 
···
 		submitted = to_submit;
 	} else if (to_submit) {
 		struct mm_struct *cur_mm;
-
-		if (current->mm != ctx->sqo_mm ||
-		    current_cred() != ctx->creds) {
-			ret = -EPERM;
-			goto out;
-		}
 
 		to_submit = min(to_submit, ctx->sq_entries);
 		mutex_lock(&ctx->uring_lock);