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4dfa203a65
Backport a patch from 2.7 branch to fix a regression with glibc 2.24 causing "OSError: [Errno 38] Function not implemented" when calling urandom() with older kernels. (From OE-Core rev: 3f2be1c857a44030478ce25b4a722667b73de446) Signed-off-by: Andreas Oberritter <obi@opendreambox.org> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
Upstream-Status: Backport
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Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
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From 905d1b30ac7cb0e31c57cec0533825c8f170b942 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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(cherry picked from commit 2687486756721e39164fa9f597e468c35d495227)
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---
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Python/random.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/Python/random.c b/Python/random.c
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index b4bc1f3..f3f5d14 100644
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--- a/Python/random.c
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+++ b/Python/random.c
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@@ -94,8 +94,15 @@ 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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