diff options
Diffstat (limited to 'crypto/rand/rand_unix.c')
-rw-r--r-- | crypto/rand/rand_unix.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c index da66773e4ab9..ec6be791b37f 100644 --- a/crypto/rand/rand_unix.c +++ b/crypto/rand/rand_unix.c @@ -365,12 +365,19 @@ static ssize_t syscall_random(void *buf, size_t buflen) * - OpenBSD since 5.6 * - Linux since 3.17 with glibc 2.25 * - FreeBSD since 12.0 (1200061) + * + * Note: Sometimes getentropy() can be provided but not implemented + * internally. So we need to check errno for ENOSYS */ # if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__) && !defined(__hpux) extern int getentropy(void *buffer, size_t length) __attribute__((weak)); - if (getentropy != NULL) - return getentropy(buf, buflen) == 0 ? (ssize_t)buflen : -1; + if (getentropy != NULL) { + if (getentropy(buf, buflen) == 0) + return (ssize_t)buflen; + if (errno != ENOSYS) + return -1; + } # else union { void *p; |