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random.c: use getrandom() if available.

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getrandom() is supported by glibc 2.25 or later.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67043 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
glass 2019-02-10 08:21:33 +00:00
parent b1cb15c4a4
commit 1a8583de72
2 changed files with 27 additions and 0 deletions
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1
configure.ac
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@ -1826,6 +1826,7 @@ AC_CHECK_FUNCS(getpgid)
AC_CHECK_FUNCS(getpgrp)
AC_CHECK_FUNCS(getpriority)
AC_CHECK_FUNCS(getpwnam_r)
AC_CHECK_FUNCS(getrandom)
AC_CHECK_FUNCS(getresgid)
AC_CHECK_FUNCS(getresuid)
AC_CHECK_FUNCS(getrlimit)

26
random.c
View file

@ -390,6 +390,32 @@ fill_random_bytes_syscall(void *seed, size_t size, int unused)
CryptGenRandom(prov, size, seed);
return 0;
}
#elif defined HAVE_GETRANDOM
#include <sys/random.h>
static int
fill_random_bytes_syscall(void *seed, size_t size, int need_secure)
{
static rb_atomic_t try_syscall = 1;
if (try_syscall) {
ssize_t ret;
size_t offset = 0;
int flags = 0;
if (!need_secure)
flags = GRND_NONBLOCK;
do {
errno = 0;
ret = getrandom(((char*)seed) + offset, size - offset, flags);
if (ret == -1) {
ATOMIC_SET(try_syscall, 0);
return -1;
}
offset += (size_t)ret;
} while(offset < size);
return 0;
}
return -1;
}
#elif defined __linux__ && defined __NR_getrandom
#include <linux/random.h>