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From 2b72637f06ad35bd5458372a964bf30a0b4f7cf9 Mon Sep 17 00:00:00 2001
From: Alon Bar-Lev <alon.barlev@gmail.com>
Date: Thu, 1 Dec 2016 21:55:17 +0200
Subject: [PATCH] system_rng: workaround read only urandom
Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
---
src/lib/rng/system_rng/system_rng.cpp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/lib/rng/system_rng/system_rng.cpp b/src/lib/rng/system_rng/system_rng.cpp
index eaba382..12b0876 100644
--- a/src/lib/rng/system_rng/system_rng.cpp
+++ b/src/lib/rng/system_rng/system_rng.cpp
@@ -135,8 +135,11 @@ void System_RNG_Impl::add_entropy(const uint8_t input[], size_t len)
* by the OS or sysadmin that additional entropy is not wanted
* in the system pool, so we accept that and return here,
* since there is no corrective action possible.
+ *
+ * In Linux EBADF or EPERM is returned if m_fd is not opened for
+ * writing.
*/
- if(errno == EPERM)
+ if(errno == EPERM || errno == EBADF)
return;
// maybe just ignore any failure here and return?
--
2.7.3
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