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std.crypto.random: introduce fork safety

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Everybody gets what they want!

 * AT_RANDOM is completely ignored.
 * On Linux, MADV_WIPEONFORK is used to provide fork safety.
 * On pthread systems, `pthread_atfork` is used to provide fork safety.
 * For systems that do not have the capability to provide fork safety,
   the implementation falls back to calling getrandom() every time.
 * If madvise is unavailable or returns an error, or pthread_atfork
   fails for whatever reason, it falls back to calling getrandom() every
   time.
 * Applications may choose to opt-out of fork safety.
 * Applications may choose to opt-in to unconditionally calling
   getrandom() for every call to std.crypto.random.fillFn.
 * Added `std.meta.globalOption`.
 * Added `std.os.madvise` and related bits.
 * Bumped up the size of the main thread TLS buffer. See the comment
   there for justification.
 * Simpler hot path in TLS initialization.
This commit is contained in:
Andrew Kelley
2020-12-18 15:38:38 -07:00
parent 2b8dcc76eb
commit 53987c932c
10 changed files with 241 additions and 71 deletions
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2
test/stack_traces.zig
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@@ -282,7 +282,7 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
\\source.zig:10:8: [address] in main (test)
\\ foo();
\\ ^
\\start.zig:377:29: [address] in std.start.posixCallMainAndExit (test)
\\start.zig:342:29: [address] in std.start.posixCallMainAndExit (test)
\\ return root.main();
\\ ^
\\start.zig:163:5: [address] in std.start._start (test)