buildroot

From: Baruch Siach <baruch@tkos.co.il>

Date: Fri, 29 Sep 2017 10:06:52 +0300

Subject: [PATCH] Fix build with musl and older Linux kernel

​

The musl libc carries its own copy of Linux system calls. When building

with Linux headers older than v3.17, musl provides SYS_getrandom

definition, but not GRND_NONBLOCK. This causes build failure for

libressl and openntpd:

​

getentropy_linux.c: In function 'getentropy_getrandom':

getentropy_linux.c:205:42: error: 'GRND_NONBLOCK' undeclared (first use in this function)

   ret = syscall(SYS_getrandom, buf, len, GRND_NONBLOCK);

                                          ^~~~~~~~~~~~~

​

Define GRND_NONBLOCK locally when its definition is missing to fix the

build. There should be no run-time effect. Older kernels return ENOSYS

for unsupported syscall().

​

[ from upstream pull request with file location changed ]

Signed-off-by: Baruch Siach <baruch@tkos.co.il>

---

Upstream status: https://github.com/libressl-portable/openbsd/pull/82

​

diff -Nuar libressl-2.5.5-orig/crypto/compat/getentropy_linux.c libressl-2.5.5/crypto/compat/getentropy_linux.c

--- libressl-2.5.5-orig/crypto/compat/getentropy_linux.c    2017-07-09 13:59:48.000000000 +0300

+++ libressl-2.5.5/crypto/compat/getentropy_linux.c 2017-09-29 10:03:32.447958829 +0300

@@ -194,6 +194,11 @@

 }

 #ifdef SYS_getrandom

+

+#ifndef GRND_NONBLOCK

+#define GRND_NONBLOCK   0x0001

+#endif

+

 static int

 getentropy_getrandom(void *buf, size_t len)

 {