Fix: sanity check /dev/urandom #4777
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RX14
reviewed
Aug 1, 2017
src/crystal/system/unix/getrandom.cr
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| @@ -12,8 +12,9 @@ module Crystal::System::Random | |||
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| if sys_getrandom(Bytes.new(16)) >= 0 | |||
| @@getrandom_available = true | |||
| else | |||
| elsif File.stat("/dev/urandom").chardev? | |||
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Please use #stat on the opened file descriptor, to avoid race conditions.
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Good catch. Will change.
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Sanity checks /dev/urandom to be character device, not a tempered file, a socket or whatever. Also makes sure that FD_CLOEXEC is set. closes crystal-lang#4752
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ysbaddaden
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Done. |
jhass
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Aug 11, 2017
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I think this is fine but it would be nice to do something about the duplicated code, especially as it is security related and reflecting any changes in all places is an absolute must. |
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I'm merging as is. If someone has an epiphany to avoid the duplication in an simple way, please open a pull request :-) |
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Sanity checks
/dev/urandomto be character device, not a tempered file, a socket or whatever. Also makes sure thatFD_CLOEXECis set.closes #4752