From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 14 Jun 2016 14:31:35 +0000 (+0200)
Subject: Fix os.urandom() using getrandom() on Linux
X-Git-Tag: v3.6.0a3~147^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b98a36e8f3006512f0fa4d94309fb9918eb8abdd;p=thirdparty%2FPython%2Fcpython.git

Fix os.urandom() using getrandom() on Linux

Issue #27278: Fix os.urandom() implementation using getrandom() on Linux.
Truncate size to INT_MAX and loop until we collected enough random bytes,
instead of casting a directly Py_ssize_t to int.
---

diff --git a/Misc/NEWS b/Misc/NEWS
index e132b968ca3c..7940cdcb6b82 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -13,6 +13,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #27278: Fix os.urandom() implementation using getrandom() on Linux.
+  Truncate size to INT_MAX and loop until we collected enough random bytes,
+  instead of casting a directly Py_ssize_t to int.
+
 - Issue #26386: Fixed ttk.TreeView selection operations with item id's
   containing spaces.
 
diff --git a/Python/random.c b/Python/random.c
index 07dacfe188e8..b9610208f669 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -143,7 +143,7 @@ py_getrandom(void *buffer, Py_ssize_t size, int raise)
            to 1024 bytes */
         n = Py_MIN(size, 1024);
 #else
-        n = size;
+        n = Py_MIN(size, INT_MAX);
 #endif
 
         errno = 0;