db488e4f52
Occasionally poll for signals during large reads of the /dev/u?random devices. This allows cancellation via SIGINT of accidental invocations of very large reads. (A 2GB /dev/random read, which takes about 10 seconds on my 2017 AMD Zen processor, can be aborted.) I believe this behavior was intended since 2014 (r273997), just not fully implemented. This is motivated by a potential getrandom(2) interface that may not explicitly forbid extremely large reads on 64-bit platforms -- even larger than the 2GB limit imposed on devfs I/O by default. Such reads, if they are to be allowed, should be cancellable by the user or administrator. Reviewed by: delphij Approved by: secteam (delphij) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D14684
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