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avoid fork-unsafe arc4random implementations

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Some old implementaions of arc4random_buf(3) were ARC4 based, or
unsafe when forked, or both.  Resort to /dev/urandom for those
known problematic cases.  Fix [Bug #15039]

Patch from Thomas Hurst <tom@hur.st>


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2018-09-04 01:42:37 +00:00
parent 183ac396d4
commit b120f5e38d
1 changed files with 6 additions and 0 deletions
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6
random.c
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@ -494,8 +494,14 @@ fill_random_bytes_syscall(void *seed, size_t size, int unused)
static int static int
fill_random_bytes_syscall(void *buf, size_t size, int unused) fill_random_bytes_syscall(void *buf, size_t size, int unused)
{ {
#if (defined(__OpenBSD__) && OpenBSD >= 201411) || \
(defined(__NetBSD__) && __NetBSD_Version__ >= 700000000) || \
(defined(__FreeBSD__) && __FreeBSD_version >= 1200079)
arc4random_buf(buf, size); arc4random_buf(buf, size);
return 0; return 0;
#else
return -1;
#endif
} }
#elif defined(_WIN32) #elif defined(_WIN32)
static void static void