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55 lines
2 KiB
Diff
55 lines
2 KiB
Diff
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This patch resolves a compatibility issue when compiled against glibc
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2.25
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and run runder kernels < 3.17:
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https://bugzilla.redhat.com/show_bug.cgi?id=1410175
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Upstream bug URLs:
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https://bugs.python.org/issue29157
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https://bugs.python.org/issue29188
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Patch adapted from upstream source repository:
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https://github.com/python/cpython/commit/01bdbad3e951014c58581635b94b22868537901c
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From 01bdbad3e951014c58581635b94b22868537901c Mon Sep 17 00:00:00 2001
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From: Victor Stinner <victor.stinner@gmail.com>
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Date: Mon, 9 Jan 2017 11:10:41 +0100
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Subject: [PATCH] Don't use getentropy() on Linux
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Issue #29188: Support glibc 2.24 on Linux: don't use getentropy() function but
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read from /dev/urandom to get random bytes, for example in os.urandom(). On
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Linux, getentropy() is implemented which getrandom() is blocking mode, whereas
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os.urandom() should not block.
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---
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Misc/NEWS | 5 +++++
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Python/random.c | 11 +++++++++--
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2 files changed, 14 insertions(+), 2 deletions(-)
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diff --git a/Python/random.c b/Python/random.c
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index 57c41ffcd6..000cb36938 100644
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--- a/Python/random.c
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+++ b/Python/random.c
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@@ -97,8 +97,15 @@ win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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}
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/* Issue #25003: Don't use getentropy() on Solaris (available since
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- * Solaris 11.3), it is blocking whereas os.urandom() should not block. */
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-#elif defined(HAVE_GETENTROPY) && !defined(sun)
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+ Solaris 11.3), it is blocking whereas os.urandom() should not block.
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+
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+ Issue #29188: Don't use getentropy() on Linux since the glibc 2.24
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+ implements it with the getrandom() syscall which can fail with ENOSYS,
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+ and this error is not supported in py_getentropy() and getrandom() is called
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+ with flags=0 which blocks until system urandom is initialized, which is not
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+ the desired behaviour to seed the Python hash secret nor for os.urandom():
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+ see the PEP 524 which was only implemented in Python 3.6. */
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+#elif defined(HAVE_GETENTROPY) && !defined(sun) && !defined(linux)
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#define PY_GETENTROPY 1
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/* Fill buffer with size pseudo-random bytes generated by getentropy().
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--
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2.12.0
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