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From 5635d44079e1bbd9c495951ede8d078e7b8d67d5 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 9 Jan 2017 11:10:41 +0100
Subject: [PATCH] Don't use getentropy() on Linux
Issue #29188: Support glibc 2.24 on Linux: don't use getentropy() function but
read from /dev/urandom to get random bytes, for example in os.urandom(). On
Linux, getentropy() is implemented which getrandom() is blocking mode, whereas
os.urandom() should not block.
---
Python/random.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/Python/random.c b/Python/random.c
index af3d0bd0d5..dc6400d3b8 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -67,9 +67,16 @@ win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
return 0;
}
-/* Issue #25003: Don' use getentropy() on Solaris (available since
- * Solaris 11.3), it is blocking whereas os.urandom() should not block. */
-#elif defined(HAVE_GETENTROPY) && !defined(sun)
+/* Issue #25003: Don't use getentropy() on Solaris (available since
+ Solaris 11.3), it is blocking whereas os.urandom() should not block.
+
+ Issue #29188: Don't use getentropy() on Linux since the glibc 2.24
+ implements it with the getrandom() syscall which can fail with ENOSYS,
+ and this error is not supported in py_getentropy() and getrandom() is called
+ with flags=0 which blocks until system urandom is initialized, which is not
+ the desired behaviour to seed the Python hash secret nor for os.urandom():
+ see the PEP 524 which was only implemented in Python 3.6. */
+#elif defined(HAVE_GETENTROPY) && !defined(sun) && !defined(linux)
#define PY_GETENTROPY 1
/* Fill buffer with size pseudo-random bytes generated by getentropy().
--
2.15.0.rc2
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