urandom: use st_ino and st_rdev to determine device uniquenessgetrandom

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/nettle/rnd-common.c b/lib/nettle/rnd-common.c
index 0c27a1e3aa..a92c9c40ac 100644
--- a/lib/nettle/rnd-common.c
+++ b/lib/nettle/rnd-common.c
@@ -137,7 +137,8 @@ void _rnd_system_entropy_deinit(void)
 #include "egd.h"
 
 static int _gnutls_urandom_fd = -1;
-static mode_t _gnutls_urandom_fd_mode = 0;
+static ino_t _gnutls_urandom_fd_ino = 0;
+static dev_t _gnutls_urandom_fd_rdev = 0;
 
 
 get_entropy_func _rnd_get_system_entropy = NULL;
@@ -272,7 +273,7 @@ int _rnd_system_entropy_check(void)
 		return 0;
 
 	ret = fstat(_gnutls_urandom_fd, &st);
-	if (ret < 0 || st.st_mode != _gnutls_urandom_fd_mode) {
+	if (ret < 0 || st.st_ino != _gnutls_urandom_fd_ino || st.st_rdev != _gnutls_urandom_fd_rdev) {
 		return _rnd_system_entropy_init();
 	}
 	return 0;
@@ -302,7 +303,8 @@ int _rnd_system_entropy_init(void)
 		fcntl(_gnutls_urandom_fd, F_SETFD, old | FD_CLOEXEC);
 
 	if (fstat(_gnutls_urandom_fd, &st) >= 0) {
-		_gnutls_urandom_fd_mode = st.st_mode;
+		_gnutls_urandom_fd_ino = st.st_ino;
+		_gnutls_urandom_fd_rdev = st.st_rdev;
 	}
 
 	_rnd_get_system_entropy = _rnd_get_system_entropy_urandom;
@@ -319,7 +321,8 @@ fallback:
 	}
 
 	if (fstat(_gnutls_urandom_fd, &st) >= 0) {
-		_gnutls_urandom_fd_mode = st.st_mode;
+		_gnutls_urandom_fd_ino = st.st_ino;
+		_gnutls_urandom_fd_rdev = st.st_rdev;
 	}
 
 	_gnutls_debug_log("EGD random generator was detected\n");