On 2024-01-26 16:50, Glenn Strauss via Cygwin wrote:
While testing ksh93u+m's recently added SRANDOM variable[1], I have
discovered a bug in Cygwin's arc4random function. After using fork(),
arc4random does not reseed itself, which causes the results to become
predictable[2]. Below is a test case C program exhibiting the bug:
...
[1]: https://github.com/ksh93/ksh/commit/00b296c
[2]: https://github.com/ksh93/ksh/issues/711
FYI: There was a thread in Nov 2023 about rand() which might be related.
rand is not ISO C compliant in Cygwin
https://cygwin.com/pipermail/cygwin/2023-November/254735.html
conclusion of that thread:
https://cygwin.com/pipermail/cygwin/2023-November/254764.html
No newlib man page or libc info but is in man-pages-linux.
Note that arc4random.c appears to be straight from OpenBSD but arc4random.h
appears to be newlib, so could function docs be added into arc4random.h, perhaps
based on OpenBSD man page?
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Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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