diff options
Diffstat (limited to 'Python/bootstrap_hash.c')
| -rw-r--r-- | Python/bootstrap_hash.c | 42 |
1 files changed, 32 insertions, 10 deletions
diff --git a/Python/bootstrap_hash.c b/Python/bootstrap_hash.c index 47369305ee8..a212f69870e 100644 --- a/Python/bootstrap_hash.c +++ b/Python/bootstrap_hash.c @@ -25,6 +25,16 @@ # include <sanitizer/msan_interface.h> #endif +#if defined(__APPLE__) && defined(__has_builtin) +# if __has_builtin(__builtin_available) +# define HAVE_GETENTRYPY_GETRANDOM_RUNTIME __builtin_available(macOS 10.12, iOS 10.10, tvOS 10.0, watchOS 3.0, *) +# endif +#endif +#ifndef HAVE_GETENTRYPY_GETRANDOM_RUNTIME +# define HAVE_GETENTRYPY_GETRANDOM_RUNTIME 1 +#endif + + #ifdef Py_DEBUG int _Py_HashSecret_Initialized = 0; #else @@ -208,6 +218,16 @@ py_getrandom(void *buffer, Py_ssize_t size, int blocking, int raise) error. getentropy() is retried if it failed with EINTR: interrupted by a signal. */ + +#if defined(__APPLE__) && defined(__has_attribute) && __has_attribute(availability) +static int +py_getentropy(char *buffer, Py_ssize_t size, int raise) + __attribute__((availability(macos,introduced=10.12))) + __attribute__((availability(ios,introduced=10.0))) + __attribute__((availability(tvos,introduced=10.0))) + __attribute__((availability(watchos,introduced=3.0))); +#endif + static int py_getentropy(char *buffer, Py_ssize_t size, int raise) { @@ -498,19 +518,21 @@ pyurandom(void *buffer, Py_ssize_t size, int blocking, int raise) #else #if defined(PY_GETRANDOM) || defined(PY_GETENTROPY) + if (HAVE_GETENTRYPY_GETRANDOM_RUNTIME) { #ifdef PY_GETRANDOM - res = py_getrandom(buffer, size, blocking, raise); + res = py_getrandom(buffer, size, blocking, raise); #else - res = py_getentropy(buffer, size, raise); + res = py_getentropy(buffer, size, raise); #endif - if (res < 0) { - return -1; - } - if (res == 1) { - return 0; - } - /* getrandom() or getentropy() function is not available: failed with - ENOSYS or EPERM. Fall back on reading from /dev/urandom. */ + if (res < 0) { + return -1; + } + if (res == 1) { + return 0; + } + /* getrandom() or getentropy() function is not available: failed with + ENOSYS or EPERM. Fall back on reading from /dev/urandom. */ + } /* end of availability block */ #endif return dev_urandom(buffer, size, raise); |